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首页> 外文期刊>Journal of Materials Engineering and Performance >Property of Amorphous/Nanocrystalline Hybrid Wires of TiNi-Base Shape Memory Alloys
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Property of Amorphous/Nanocrystalline Hybrid Wires of TiNi-Base Shape Memory Alloys

机译：TiNi基形状记忆合金的非晶/纳米晶杂化线的性能

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摘要

The microstructures and mechanical properties of amorphousanocrystalline hybrid TiNi wires produced by severe cold drawing were investigated. Annealed wires of Ti-50.9 mol%Ni and Ti-41 mol%Ni-8.5 mol%Cu were subjected to severe cold drawing of 50-70% reduction. The as-drawn TiNi wires were composed of the mixture of amorphous phase and predominantly B2 nanocrystalline phase. Young's modulus increased with the drawing reduction which can be attributed to the increase in the amount of amorphous phase. For the binary TiNi wires, the volume fraction of amorphous phase was estimated to be about 60% from Young's modulus and electrical resistivity. The wires drawn over 60% exhibited peculiar large linear elastic strain which is quite different from superelasticity. Aging at 573 K led to an increase in tensile elongation as well as in the recoverable strain. The amorphization by cold drawing was also confirmed for Ti-41 mol%Ni-8.5 mol%Cu in 62% drawn wires.
机译：研究了通过严格冷拔生产的非晶/纳米晶混合TiNi丝的组织和力学性能。 Ti-50.9 mol％Ni和Ti-41 mol％Ni-8.5 mol％Cu的退火线经受了50-70％的减少量的严重冷拔。拉伸后的TiNi线由非晶相和主要为B2纳米晶相的混合物组成。杨氏模量随着拉深的减少而增加，这可以归因于非晶相数量的增加。对于二元TiNi线，根据杨氏模量和电阻率，非晶相的体积分数估计为约60％。超过60％的线材表现出特别大的线性弹性应变，这与超弹性大不相同。 573 K时效导致拉伸伸长率和可恢复应变的增加。对于62％拉丝的Ti-41mol％Ni-8.5mol％Cu，也证实了通过冷拉丝的非晶化。

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