S0303-2-6 粉末冶金プロセスによるTi-Ni-Zr高温形状記憶特性の作製(形状記憶合金の特性と応用展開(2))

概要

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Ti-Ni-Zr shape memory alloys were fabricated by powder metallurgy (P/M) process. The effects of fabrication conditions on the microstructure and shape memory characteristics of Ti-50.2mol%Ni-5mol%Zr alloy were investigated. Two types of powders were fabricated by mechanical alloying. Elemental Ti, Ni and Zr powders were mixed by a planetary ball mill at a rotational speed of 500 rpm for milling times of 0.6 ks (mixed powder) and 720 ks (alloyed powder). In the case of the alloyed powder, the microstructure of the as-sintered alloy was homogeneous. The transformation temperatures of the alloy showed higher than those of the wrought alloy. But the alloy showed no shape memory effect and poor tensile property due to contamination of the alloyed powder. The alloy of the mixed powder solution-treated at 1173 K had shape memory effect. The shape recovery property of the alloy was stabilized due to the cycle of heating after loading.
社団法人日本機械学会の論文
2009-09-12