Investigation of the phase evolution in a super-elastic NiTi shape memory alloy (50.7 at.%Ni) under extensional load with synchrotron radiation
Investigation of the phase evolution in a super-elastic NiTi shape memory alloy (50.7 at.%Ni) under extensional load with synchrotron radiation
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DOI：
10.1016/j.msea.2003.11.081
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发表时间：
2004-07-25
期刊：
影响因子：
6.4
通讯作者：
Somsen, C
中科院分区：
文献类型：
--
作者：
Schmahl, WW;Khalil-Allafi, J;Somsen, C
采用同步辐射衍射和衍射成像技术研究了超弹性NiTi中与应力诱导相变和剪切带形成相关的非均匀应变分布。我们观察到奥氏体（110）衍射峰的大位移是拉伸应变的函数。这表明在类似吕德斯剪切转变带的马氏体基体内残余奥氏体晶粒上有显著的载荷传递。剪切带与周围奥氏体交界面处存在明显的应力状态。(C) 2004 Elsevier B.V.版权所有
Inhomogeneous strain distribution associated with stress induced transformation and shear-band formation in super-elastic NiTi is investigated by diffraction with synchrotron radiation and diffraction imaging. We observe a large displacement of the austenite (110) diffraction peak as a function of tensile strain. This indicates a significant load transfer on residual austenite grains within the martensite matrix of a Luders-like shear transformation band. A distinct stress state occurs at the interface between the shear-band and the surrounding austenite. (C) 2004 Elsevier B.V. All rights reserved.