Effects of grain size on compressive behavior of NiTi polycrystalline superelastic macro- and micropillars

Effects of grain size on compressive behavior of NiTi polycrystalline superelastic macro- and micropillars
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晶粒尺寸对 NiTi 多晶超弹性宏观和微柱压缩行为的影响

DOI:
10.1016/j.matlet.2017.11.069
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发表时间:
2018-03
期刊:
影响因子:
3
通讯作者:
Sun Qingping
Sun Qingping
中科院分区:
材料科学3区
文献类型:
--
作者:
Kabirifar Parham;Chu Kangjie;Ren Fuzeng;Sun Qingping

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采用聚焦离子束技术制备了直径为0.5 μm、高为1.5 μm、平均晶粒度为10~421 nm的NiTi多晶柱,并用纳米压痕法进行了压缩。结果表明,应力应变滞后环面积、相变应力和相变应变随晶粒度的变化呈非单调变化。分析结果表明,当晶粒度从10 nm增大时,通过促进马氏体区的形核和长大来促进相变。当颗粒尺寸接近柱状尺寸时,颗粒约束的增加和大颗粒内部应力应变状态的非均质性抑制了相变。
Polycrystalline NiTi pillars of 0.5 μm diameter and 1.5 μm height with average grain sizes from 10 to 421 nm are fabricated by focused ion beam and compressed by nanoindentation. It is found that stress–strain hysteresis loop area, transformation stress and transformation strain vary non-monotonically with grain size. Analysis of the results reveals that increasing the grain size from 10 nm enhances the transformation by promoting the nucleation and growth of martensite domains. When the grain size approaches the pillar size, the transformation is suppressed by an increase in granular constraints and heterogeneity of internal stress–strain state among large grains.
纳米晶 NiTi 形状记忆合金杨氏模量和硬度的晶粒尺寸依赖性
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