Deformation mechanism and load transfer in an in-situ NiTi–Nb composite
Deformation mechanism and load transfer in an in-situ NiTi–Nb composite
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原位 NiTi-Nb 复合材料的变形机制和载荷传递
DOI：
10.1016/j.msea.2022.144034
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发表时间：
2022-09
期刊：
影响因子：
--
通讯作者：
Lishan Cui
中科院分区：
文献类型：
--
作者：
Jiang Jiang;Shijie Hao;Daqiang Jiang;Xiaobin Shi;Yang Ren;Lishan Cui
采用同步辐射X射线衍射技术研究了原位Nb纳米线增强NiTi形状记忆合金复合材料的循环变形行为。Nb纳米线的局部硬化和相应的局部弛豫在NiTi基体中检测到的Lüders带前应力诱导马氏体相变，表明相负载从转变的NiTi到Nb纳米线。基于载荷传递理论，提出了在平均相应力低于临界相变应力时，复合材料发生Lüders变形的自蔓延相变过程。Nb纳米线在第一次拉伸循环后的变形模式由Lüders样局部变形转变为均匀变形，这是由于Nb纳米线在伪弹性循环后发生塑性变形，NiTi纳米线内部形成应力梯度场所致。
In this study, the cyclic deformation behaviours of an in-situ Nb nanowire reinforced NiTi shape memory alloy composite were studied by in-situ synchrotron X-ray diffraction measurements. Localized hardening in Nb nanowire and the corresponding localized relaxation in NiTi matrix were detected in the Lüders band front upon stress-induced martensitic transformation, indicating a phase load transfer from the transformed NiTi to Nb nanowire. Based on the load transfer, a self-propagating transformation process performing under an average phase stress lower than the critical transformation stress was proposed, which should be responsible for the Lüders-like deformation of the composite. The change of deformation mode from Lüders-like localized deformation to homogeneous deformation after the first tensile cycle was attributed to the plastic deformation in Nb nanowire and the formation of internal stress gradient field in NiTi upon pseudoelastic cycling.
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