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Ternary shape memory alloys powder feedstock fabrication by advanced mechanical alloying
 Regináč, Jan ; Moravčík, Igor (oponent) ; Čížek, Jan (vedoucí práce)
Powder metallurgy is used as an alternative method for producing Cu-based shape memory alloys. This method provided better results in the composition and grain size than conventional casting method. In the present work, mechanical alloying process is applied to convert the elemental powder mixtures of Cu-Al-Ni into pre-alloyed powders. The aim of this work was to find the optimal parameters to fabricate the most suitable powder feedstock intended for subsequent processing. SEM, EDX and X-ray Diffraction analysis have been used to characterize the effect of changing parameters on the obtained structure and possible formation of new phases. It was shown that high-energy milling is a suitable method for production of such pre-alloyed powders. Based on the results, it was found that a Cu-based solid solution was formed, independent on changing of parameters. The results further revealed that the high energy input in form of revolutions and long milling times, could cause a formation of amorphous phases.
Úplný záznam
Ternary shape memory alloys powder feedstock fabrication by advanced mechanical alloying
 Regináč, Jan ; Moravčík, Igor (oponent) ; Čížek, Jan (vedoucí práce)
Powder metallurgy is used as an alternative method for producing Cu-based shape memory alloys. This method provided better results in the composition and grain size than conventional casting method. In the present work, mechanical alloying process is applied to convert the elemental powder mixtures of Cu-Al-Ni into pre-alloyed powders. The aim of this work was to find the optimal parameters to fabricate the most suitable powder feedstock intended for subsequent processing. SEM, EDX and X-ray Diffraction analysis have been used to characterize the effect of changing parameters on the obtained structure and possible formation of new phases. It was shown that high-energy milling is a suitable method for production of such pre-alloyed powders. Based on the results, it was found that a Cu-based solid solution was formed, independent on changing of parameters. The results further revealed that the high energy input in form of revolutions and long milling times, could cause a formation of amorphous phases.
Úplný záznam

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5 Regináč, Jozef
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