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期刊论文
Phase transformation of NiTi shape memory alloy powders preparedby ball milling
Journal of Alloys and Compounds 477(2009)576-579，-0001，（）：
Ni50.8Ti49.2 alloy powders of different particle shapes and sizes have been prepared by ball milling. Thepowder milled for 1h has large flaky particles and are partially amorphous. The powder crystallizedthrough a single-stage exothermic transformation upon heating. Powders milled for longer durationsconsisted of partially amorphous Ni-Ti, [Fe,Ni] and Ni-Cr-Fe phases, indicating heavy contaminationfrom the milling vessel. Upon heating, the milled powders exhibited an endothermic event at ∼400℃. After annealing at 500℃, the milled powders were fully crystallized. The crystallized powders exhibitedmartensitic transformation with reduced heat effect. The critical temperatures of the transformationwerefound to decrease with increasing ball milling time.
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