In the present study, elemental mixtures of Al, Ni and Nd powders with nominal compositions of Al... more In the present study, elemental mixtures of Al, Ni and Nd powders with nominal compositions of Al 88 Ni 10 Nd 2 was mechanically alloyed for times up 110 h yields amorphous or nanocrystalline products. Structural changes and thermal behaviour of the mechanically alloyed powders at different stages of milling have been characterized by X-ray diffraction (XRD), differential scanning calorimetry (DSC) and scanning electron microscopy (SEM). The XRD, DSC and SEM results showed that solid state reaction occurred during mechanical alloying and nano-intermetallic compounds of the Al 88 Ni 10 Nd 2 powders can be obtained. Microstructure of the mechanically alloyed Al 88 Ni 10 Nd 2 powder indicates the formation of fine nanoparticles with a size of about 10-20 nm. However, no amorphous phase has been obtained in Al 88 Ni 10 Nd 2 powders after milled for times up 110 h.
International Journal of Scientific and Technological Research, 2015
In this work, the heat effect on the crystallization of amorphous Al85Nd5Ni10 alloy was produced ... more In this work, the heat effect on the crystallization of amorphous Al85Nd5Ni10 alloy was produced by means of rapid solidified was investigated in heat treatment by differential scanning calorimetry (DSC) and X-ray diffraction (XRD). Continuous heating DSC trace of amorphous Al85Nd5Ni10 alloy consisted of three exothermic peaks. The onset and peak temperatures for these peaks shifted toward higher temperatures when the heating rate was increased. Activation energies for the three exothermic peaks determined by the Kissinger method, which gives as 251, 341 and 260 kJ/mol, respectively. Isothermal annealing DSC traces for the first crystallization peak was showed one-dimensional growth by JohnsonMehlAvrami kinetics (JMA) with an Avrami exponent n of 1.0-1.4. However isothermal annealing DSC traces for the second and third crystallization peaks were showed nucleation and growth with two-dimensional by JMA kinetics with an Avrami exponent n of 1.85-2.25. The XRD analysis after different heat treatment of three crystallization peaks showed that α-Al phase; fcc-Al phases, Al3Ni and Al11Nd3 like intermetallic phases; fcc-Al phases, Ni and Nd phases, AlNiNd phases, Al3Ni and Al11Nd3 like intermetallic phases and unknown phases; respectively.
We prepared and characterized silica-polyethylene-block-polyethylene glycol (PEPEG) nanocomposite... more We prepared and characterized silica-polyethylene-block-polyethylene glycol (PEPEG) nanocomposite xerogels and investigated the role of addition of the elastic PEPEG oligomer in a brittle porous silica matrix by relating microstructure to mechanical properties. For PEPEG < 7 wt.%, the oligomer fills smaller pores in the silica matrix; but, as evidenced by atomic force microscopy and Fourier transform infrared spectroscopy, PEPEG partially disrupts matrix formation at higher concentrations. Consequently the pore size distribution shifts towards larger sizes and the specific surface area of the composite decreases. The toughness increases continuously with PEPEG addition. The elastic modulus of the composite increases twofold for 7 wt.% PEPEG, but decreases on further addition of PEPEG. Microhardness and structural loss factor also show a similar optimum for PEPEG at around 5-7 wt.%. The analytical and empirical models agree with the experimental modulus values for lower PEPEG addition, but fail to explain the maximum because of their inability to capture the observed microstructural changes in the composite structure.
The PDKT mill for fast rolling of cable of diameter 1.5 and 1.0 mm is described; it is highly eff... more The PDKT mill for fast rolling of cable of diameter 1.5 and 1.0 mm is described; it is highly effective and reliable.
Aluminium-nickel alloy with nominal composition 6.5 wt.% Ni has been manufactured by chill-castin... more Aluminium-nickel alloy with nominal composition 6.5 wt.% Ni has been manufactured by chill-casting and melt-spinning methods. The resulting microstructures have been examined by optical microscopy (OM) and scanning electron microscopy (SEM). These results showed that the microstructure of the rapidly solidified ribbons is clearly different from that of the chill-casting alloy. The effect of the wheel speed on rapidly solidified ribbons dimension and the relationship between ribbon thickness and wheel speed was also examined. It was found that there is good relationship between ribbon thickness and wheel speed. The ribbon thickness decreased inversely with the wheel speed. Furthermore, the microhardness of the chill-casting alloy and the rapidly solidified ribbons were measured by using a Vickers indenter. The result showed that the microhardness of the rapidly solidified ribbons is higher than that of chill-casting alloy.
In this work, AlMgTiB light alloys were produced at different rates and their structure and mecha... more In this work, AlMgTiB light alloys were produced at different rates and their structure and mechanical properties were examined. This alloys, 2 different alloys Al76Mg15Ti6B3 and Al75Mg15Ti6B4 were produced by changing the proportions of "AlMgTiB" (metals form of the purity of 99.99%) alloy elements. “AlMgTiB” alloy were produced by metal casting method. These alloys were characterized the crystal and phase content of the samples by X-ray diffraction (XRD), scanning electron microscopy (SEM) for their morphological properties, the alloys compositions as well as the concentrations of elements impurities were controlled by Energy-dispersive X-ray spectroscopy(EDX), mechanical properties for Vickers microhardness measurement. Xray diffraction analysis has revealed that all the prepared compositions had strongly crystal structures. The highest value of microhardness of Al75Mg15Ti6B4 ingots were determined.
Elemental mixtures of Al, Cu, Fe powders with the nominal composition of Al 70 Cu 20 Fe 10 were m... more Elemental mixtures of Al, Cu, Fe powders with the nominal composition of Al 70 Cu 20 Fe 10 were mechanically alloyed in a planetary ball mill for 80 h. Subsequent annealing of the as-milled powders were performed at 600-800 • C temperature range for 4 h. Structural characteristics of the mechanically alloyed Al 70 Cu 20 Fe 10 powders with the milling time and the heat treatment were investigated by X-ray diffraction (XRD), differential scanning calorimeter (DSC) and differential thermal analysis (DTA). Mechanical alloying of the Al 70 Cu 20 Fe 10 did not result in the formation of icosahedral quasicrystalline phase (i-phase) and a long time milling resulted in the formation of β-Al(Cu,Fe) solid solution phase (β-phase). The i-phase was observed only for short-time milled powders after heat treatment above 600 • C. The β-phase was one of the major phases in the Al 70 Cu 20 Fe 10 alloy. The w-Al 7 Cu 2 Fe 1 phase (w-phase) was obtained only after heat treatment of the short-time milled and unmilled samples. The present investigation indicated that a suitable technique to obtain a large amount of quasicrystalline powders is to use a combination of short-time milling and subsequent annealing.
In this study, AlMgTiB alloys composed of the metals with the lowest specific gravity were produc... more In this study, AlMgTiB alloys composed of the metals with the lowest specific gravity were produced by metal mold casting method. Aluminum, Magnesium, Titanium and Boron 99.9% pure metal elements are used. Al85Mg10Ti4B1 and Al84Mg10Ti4B2 were produced in different alloys. In casting, cast iron metal mold, 2 kg graphite crucible and induction furnace were used. Prior to casting, we weighed the atomic weights of the alloying elements on a precision scale and left titanium and aluminum materials starting with boron, which has the highest melting point in the graphite pot. After 30 minutes of initial melting, argon gas was introduced into the pot through the pot. The incorporation of magnesium is very precise and dangerous, and the melting temperature of the melt is measured at 750 oC for the addition of magnesium to the melt, while magnesium is added to the alloy in small pieces. The necessary safety precautions during production were made with glasses, apron, mask and protective cap. ...
Abstract In this study, the variation of the resistivity of Al 85 Y 9 Ni 6 metallic glass produce... more Abstract In this study, the variation of the resistivity of Al 85 Y 9 Ni 6 metallic glass produced by melt-spinning method was investigated and formulated. DSC results demonstrate three crystallization peaks and resistivity measurements support this result. The electrical resistivity measurements were carried out in the temperature range 300–877 K by the four-point method. The greatest reduction in resistivity was observed at temperatures between 527–632 K.
Kahramanmaraş Sütçü İmam Üniversitesi Mühendislik Bilimleri Dergisi
Bu çalışmada, Al78Mg15Ti6B1 ve Al77Mg15Ti6B2 (at.%) alaşımları normal katılaştırma yöntemi ile kü... more Bu çalışmada, Al78Mg15Ti6B1 ve Al77Mg15Ti6B2 (at.%) alaşımları normal katılaştırma yöntemi ile külçeler halinde üretilmiştir. Alaşımların yapısal ve morfolojik özellikleri, X-ışını difraksiyonu (XRD), taramalı elektron mikroskobu (SEM) ve enerji dağılımlı X-ışını spektroskopisi (EDX) ile incelendi. Alaşımların mekanik özellikleri Vickers mikrosertlik(HV) cihazı ile incelenmiştir. Sonuçlar Mg, Ti ve B atomlarının; α-Al, Al3Mg2 ve Al3Ti katı çözeltisini oluşturmak üzere Al kafesi içerinde çözündüğünü göstermiştir. Taramalı elektron mikroskobu (SEM) sonuçları alaşımların mikro yapısının çubuksu fazlardan oluştuğunu göstermiştir. Al77Mg15Ti6B2 alaşımın mikrosertlik değeri Al78Mg15Ti6B1 alaşımın mikrosertlik değerinden daha yüksek bulunmuştur. Bu sonuç Bor ilavesinin alaşımın mikrosertlik değerinde artışa neden olduğunu göstermektedir.
Bu çalışmada nanoyapılı Al 85 Co 7 Y 8 (at.%) alaşımı, mekanik alaşımlama (MA) tekniği kullanılar... more Bu çalışmada nanoyapılı Al 85 Co 7 Y 8 (at.%) alaşımı, mekanik alaşımlama (MA) tekniği kullanılarak elementel tozların katı hal reaksiyonuyla sentezlenmiştir. Toz alaşımlar, argon gazı altında sertleştirilmiş paslanmaz çelik hazne ve bilyeler kullanılarak yüksek-enerjili bilyeli değirmen içerisinde 300 saatlik öğütme işlemine tabi tutulmuştur. Öğütme işlemi süresince numunelerdeki yapısal ve morfolojik değişimler X-ışını difraksiyonu (XRD) ve taramalı elektron mikroskobu (SEM) ile termal kararlılıkları ise diferansiyel termal analiz (DTA) ile incelenmiştir. MA işlemi sonucunda aşırı doymuş fcc-Al katı çözelti fazı içeren alaşımlar üretilmiştir. Al 85 Co 7 Y 8 alaşımının 300 saatlik öğütme işlemi sonrasındaki kristalit boyutu yaklaşık 16 nm olarak bulunmuştur.
Elemental mixtures of Al, Cu, Fe powders with the nominal composition of Al 70 Cu 20 Fe 10 were m... more Elemental mixtures of Al, Cu, Fe powders with the nominal composition of Al 70 Cu 20 Fe 10 were mechanically alloyed in a planetary ball mill for 80 h. Subsequent annealing of the as-milled powders were performed at 600-800 • C temperature range for 4 h. Structural characteristics of the mechanically alloyed Al 70 Cu 20 Fe 10 powders with the milling time and the heat treatment were investigated by X-ray diffraction (XRD), differential scanning calorimeter (DSC) and differential thermal analysis (DTA). Mechanical alloying of the Al 70 Cu 20 Fe 10 did not result in the formation of icosahedral quasicrystalline phase (i-phase) and a long time milling resulted in the formation of β-Al(Cu,Fe) solid solution phase (β-phase). The i-phase was observed only for short-time milled powders after heat treatment above 600 • C. The β-phase was one of the major phases in the Al 70 Cu 20 Fe 10 alloy. The w-Al 7 Cu 2 Fe 1 phase (w-phase) was obtained only after heat treatment of the short-time milled and unmilled samples. The present investigation indicated that a suitable technique to obtain a large amount of quasicrystalline powders is to use a combination of short-time milling and subsequent annealing.
In the present study, elemental mixtures of Al, Ni and Nd powders with nominal compositions of Al... more In the present study, elemental mixtures of Al, Ni and Nd powders with nominal compositions of Al 88 Ni 10 Nd 2 was mechanically alloyed for times up 110 h yields amorphous or nanocrystalline products. Structural changes and thermal behaviour of the mechanically alloyed powders at different stages of milling have been characterized by X-ray diffraction (XRD), differential scanning calorimetry (DSC) and scanning electron microscopy (SEM). The XRD, DSC and SEM results showed that solid state reaction occurred during mechanical alloying and nano-intermetallic compounds of the Al 88 Ni 10 Nd 2 powders can be obtained. Microstructure of the mechanically alloyed Al 88 Ni 10 Nd 2 powder indicates the formation of fine nanoparticles with a size of about 10-20 nm. However, no amorphous phase has been obtained in Al 88 Ni 10 Nd 2 powders after milled for times up 110 h.
International Journal of Scientific and Technological Research, 2015
In this work, the heat effect on the crystallization of amorphous Al85Nd5Ni10 alloy was produced ... more In this work, the heat effect on the crystallization of amorphous Al85Nd5Ni10 alloy was produced by means of rapid solidified was investigated in heat treatment by differential scanning calorimetry (DSC) and X-ray diffraction (XRD). Continuous heating DSC trace of amorphous Al85Nd5Ni10 alloy consisted of three exothermic peaks. The onset and peak temperatures for these peaks shifted toward higher temperatures when the heating rate was increased. Activation energies for the three exothermic peaks determined by the Kissinger method, which gives as 251, 341 and 260 kJ/mol, respectively. Isothermal annealing DSC traces for the first crystallization peak was showed one-dimensional growth by JohnsonMehlAvrami kinetics (JMA) with an Avrami exponent n of 1.0-1.4. However isothermal annealing DSC traces for the second and third crystallization peaks were showed nucleation and growth with two-dimensional by JMA kinetics with an Avrami exponent n of 1.85-2.25. The XRD analysis after different heat treatment of three crystallization peaks showed that α-Al phase; fcc-Al phases, Al3Ni and Al11Nd3 like intermetallic phases; fcc-Al phases, Ni and Nd phases, AlNiNd phases, Al3Ni and Al11Nd3 like intermetallic phases and unknown phases; respectively.
We prepared and characterized silica-polyethylene-block-polyethylene glycol (PEPEG) nanocomposite... more We prepared and characterized silica-polyethylene-block-polyethylene glycol (PEPEG) nanocomposite xerogels and investigated the role of addition of the elastic PEPEG oligomer in a brittle porous silica matrix by relating microstructure to mechanical properties. For PEPEG < 7 wt.%, the oligomer fills smaller pores in the silica matrix; but, as evidenced by atomic force microscopy and Fourier transform infrared spectroscopy, PEPEG partially disrupts matrix formation at higher concentrations. Consequently the pore size distribution shifts towards larger sizes and the specific surface area of the composite decreases. The toughness increases continuously with PEPEG addition. The elastic modulus of the composite increases twofold for 7 wt.% PEPEG, but decreases on further addition of PEPEG. Microhardness and structural loss factor also show a similar optimum for PEPEG at around 5-7 wt.%. The analytical and empirical models agree with the experimental modulus values for lower PEPEG addition, but fail to explain the maximum because of their inability to capture the observed microstructural changes in the composite structure.
The PDKT mill for fast rolling of cable of diameter 1.5 and 1.0 mm is described; it is highly eff... more The PDKT mill for fast rolling of cable of diameter 1.5 and 1.0 mm is described; it is highly effective and reliable.
Aluminium-nickel alloy with nominal composition 6.5 wt.% Ni has been manufactured by chill-castin... more Aluminium-nickel alloy with nominal composition 6.5 wt.% Ni has been manufactured by chill-casting and melt-spinning methods. The resulting microstructures have been examined by optical microscopy (OM) and scanning electron microscopy (SEM). These results showed that the microstructure of the rapidly solidified ribbons is clearly different from that of the chill-casting alloy. The effect of the wheel speed on rapidly solidified ribbons dimension and the relationship between ribbon thickness and wheel speed was also examined. It was found that there is good relationship between ribbon thickness and wheel speed. The ribbon thickness decreased inversely with the wheel speed. Furthermore, the microhardness of the chill-casting alloy and the rapidly solidified ribbons were measured by using a Vickers indenter. The result showed that the microhardness of the rapidly solidified ribbons is higher than that of chill-casting alloy.
In this work, AlMgTiB light alloys were produced at different rates and their structure and mecha... more In this work, AlMgTiB light alloys were produced at different rates and their structure and mechanical properties were examined. This alloys, 2 different alloys Al76Mg15Ti6B3 and Al75Mg15Ti6B4 were produced by changing the proportions of "AlMgTiB" (metals form of the purity of 99.99%) alloy elements. “AlMgTiB” alloy were produced by metal casting method. These alloys were characterized the crystal and phase content of the samples by X-ray diffraction (XRD), scanning electron microscopy (SEM) for their morphological properties, the alloys compositions as well as the concentrations of elements impurities were controlled by Energy-dispersive X-ray spectroscopy(EDX), mechanical properties for Vickers microhardness measurement. Xray diffraction analysis has revealed that all the prepared compositions had strongly crystal structures. The highest value of microhardness of Al75Mg15Ti6B4 ingots were determined.
Elemental mixtures of Al, Cu, Fe powders with the nominal composition of Al 70 Cu 20 Fe 10 were m... more Elemental mixtures of Al, Cu, Fe powders with the nominal composition of Al 70 Cu 20 Fe 10 were mechanically alloyed in a planetary ball mill for 80 h. Subsequent annealing of the as-milled powders were performed at 600-800 • C temperature range for 4 h. Structural characteristics of the mechanically alloyed Al 70 Cu 20 Fe 10 powders with the milling time and the heat treatment were investigated by X-ray diffraction (XRD), differential scanning calorimeter (DSC) and differential thermal analysis (DTA). Mechanical alloying of the Al 70 Cu 20 Fe 10 did not result in the formation of icosahedral quasicrystalline phase (i-phase) and a long time milling resulted in the formation of β-Al(Cu,Fe) solid solution phase (β-phase). The i-phase was observed only for short-time milled powders after heat treatment above 600 • C. The β-phase was one of the major phases in the Al 70 Cu 20 Fe 10 alloy. The w-Al 7 Cu 2 Fe 1 phase (w-phase) was obtained only after heat treatment of the short-time milled and unmilled samples. The present investigation indicated that a suitable technique to obtain a large amount of quasicrystalline powders is to use a combination of short-time milling and subsequent annealing.
In this study, AlMgTiB alloys composed of the metals with the lowest specific gravity were produc... more In this study, AlMgTiB alloys composed of the metals with the lowest specific gravity were produced by metal mold casting method. Aluminum, Magnesium, Titanium and Boron 99.9% pure metal elements are used. Al85Mg10Ti4B1 and Al84Mg10Ti4B2 were produced in different alloys. In casting, cast iron metal mold, 2 kg graphite crucible and induction furnace were used. Prior to casting, we weighed the atomic weights of the alloying elements on a precision scale and left titanium and aluminum materials starting with boron, which has the highest melting point in the graphite pot. After 30 minutes of initial melting, argon gas was introduced into the pot through the pot. The incorporation of magnesium is very precise and dangerous, and the melting temperature of the melt is measured at 750 oC for the addition of magnesium to the melt, while magnesium is added to the alloy in small pieces. The necessary safety precautions during production were made with glasses, apron, mask and protective cap. ...
Abstract In this study, the variation of the resistivity of Al 85 Y 9 Ni 6 metallic glass produce... more Abstract In this study, the variation of the resistivity of Al 85 Y 9 Ni 6 metallic glass produced by melt-spinning method was investigated and formulated. DSC results demonstrate three crystallization peaks and resistivity measurements support this result. The electrical resistivity measurements were carried out in the temperature range 300–877 K by the four-point method. The greatest reduction in resistivity was observed at temperatures between 527–632 K.
Kahramanmaraş Sütçü İmam Üniversitesi Mühendislik Bilimleri Dergisi
Bu çalışmada, Al78Mg15Ti6B1 ve Al77Mg15Ti6B2 (at.%) alaşımları normal katılaştırma yöntemi ile kü... more Bu çalışmada, Al78Mg15Ti6B1 ve Al77Mg15Ti6B2 (at.%) alaşımları normal katılaştırma yöntemi ile külçeler halinde üretilmiştir. Alaşımların yapısal ve morfolojik özellikleri, X-ışını difraksiyonu (XRD), taramalı elektron mikroskobu (SEM) ve enerji dağılımlı X-ışını spektroskopisi (EDX) ile incelendi. Alaşımların mekanik özellikleri Vickers mikrosertlik(HV) cihazı ile incelenmiştir. Sonuçlar Mg, Ti ve B atomlarının; α-Al, Al3Mg2 ve Al3Ti katı çözeltisini oluşturmak üzere Al kafesi içerinde çözündüğünü göstermiştir. Taramalı elektron mikroskobu (SEM) sonuçları alaşımların mikro yapısının çubuksu fazlardan oluştuğunu göstermiştir. Al77Mg15Ti6B2 alaşımın mikrosertlik değeri Al78Mg15Ti6B1 alaşımın mikrosertlik değerinden daha yüksek bulunmuştur. Bu sonuç Bor ilavesinin alaşımın mikrosertlik değerinde artışa neden olduğunu göstermektedir.
Bu çalışmada nanoyapılı Al 85 Co 7 Y 8 (at.%) alaşımı, mekanik alaşımlama (MA) tekniği kullanılar... more Bu çalışmada nanoyapılı Al 85 Co 7 Y 8 (at.%) alaşımı, mekanik alaşımlama (MA) tekniği kullanılarak elementel tozların katı hal reaksiyonuyla sentezlenmiştir. Toz alaşımlar, argon gazı altında sertleştirilmiş paslanmaz çelik hazne ve bilyeler kullanılarak yüksek-enerjili bilyeli değirmen içerisinde 300 saatlik öğütme işlemine tabi tutulmuştur. Öğütme işlemi süresince numunelerdeki yapısal ve morfolojik değişimler X-ışını difraksiyonu (XRD) ve taramalı elektron mikroskobu (SEM) ile termal kararlılıkları ise diferansiyel termal analiz (DTA) ile incelenmiştir. MA işlemi sonucunda aşırı doymuş fcc-Al katı çözelti fazı içeren alaşımlar üretilmiştir. Al 85 Co 7 Y 8 alaşımının 300 saatlik öğütme işlemi sonrasındaki kristalit boyutu yaklaşık 16 nm olarak bulunmuştur.
Elemental mixtures of Al, Cu, Fe powders with the nominal composition of Al 70 Cu 20 Fe 10 were m... more Elemental mixtures of Al, Cu, Fe powders with the nominal composition of Al 70 Cu 20 Fe 10 were mechanically alloyed in a planetary ball mill for 80 h. Subsequent annealing of the as-milled powders were performed at 600-800 • C temperature range for 4 h. Structural characteristics of the mechanically alloyed Al 70 Cu 20 Fe 10 powders with the milling time and the heat treatment were investigated by X-ray diffraction (XRD), differential scanning calorimeter (DSC) and differential thermal analysis (DTA). Mechanical alloying of the Al 70 Cu 20 Fe 10 did not result in the formation of icosahedral quasicrystalline phase (i-phase) and a long time milling resulted in the formation of β-Al(Cu,Fe) solid solution phase (β-phase). The i-phase was observed only for short-time milled powders after heat treatment above 600 • C. The β-phase was one of the major phases in the Al 70 Cu 20 Fe 10 alloy. The w-Al 7 Cu 2 Fe 1 phase (w-phase) was obtained only after heat treatment of the short-time milled and unmilled samples. The present investigation indicated that a suitable technique to obtain a large amount of quasicrystalline powders is to use a combination of short-time milling and subsequent annealing.
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