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首页> 外文期刊>Journal of Materials Engineering and Performance >Flow Behaviors and Processing Maps of NiTi Shape Memory Alloy with Microstructural Observations on Austenite Phase during Hot Compression
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Flow Behaviors and Processing Maps of NiTi Shape Memory Alloy with Microstructural Observations on Austenite Phase during Hot Compression

机译：热压缩期间奥氏体相位微观结构观测的流动行为及处理地图

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摘要

The flow stress-strain curves, strain rate sensitivity (m) and processing maps of Ni50.8Ti49.2 shape memory alloy were analyzed in the present study. The microstructure of deformed samples at some processing parameters was observed via optical micrograph (OM) and electron backscatter diffraction (EBSD) techniques. The results showed that an early yield reduction phenomenon were observed at the deformation temperatures 800 and 900 degrees C and strain rates of 1 and 0.1 s(-1), and it extended at 600 degrees C as the strain rate was 0.01 s(-1) due to the noticeable softening effect after escaping the pinning site. The maximum m-value of 0.29 occurred at a deformation temperature of 800 degrees C due to the occurrence of complete dynamic recrystallization. The instability region of NiTi shape memory alloy increased with increasing strain, in which the austenite grains were obviously elongated and showed an oriented characteristics.
机译：给出了Ni50的流变应力-应变曲线、应变率敏感性（m）和加工图。8Ti49。本研究分析了2种形状记忆合金。通过光学显微照片（OM）和电子背散射衍射（EBSD）技术观察了变形样品在某些工艺参数下的微观结构。结果表明，在变形温度为800和900℃、应变速率为1和0.1s（-1）时，观察到早期屈服降低现象，并在应变率为0.01 s（-1）时，由于逃离钉扎位置后的明显软化效应，在600℃时屈服降低现象扩展。由于发生完全动态再结晶，最大m值0.29出现在800℃的变形温度下。NiTi形状记忆合金的不稳定区随着应变的增加而增加，其中奥氏体晶粒明显拉长，并表现出取向特征。

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