Direct microstructural evidence for the stress induced formation of martensite during nanonindentation of NiTi
Direct microstructural evidence for the stress induced formation of martensite during nanonindentation of NiTi
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DOI：
10.1016/j.msea.2013.10.035
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发表时间：
2014-01
期刊：
影响因子：
6.4
通讯作者：
J. Pfetzing‐Micklich;N. Wieczorek;T. Simon;B. Maass;G. Eggeler
中科院分区：
文献类型：
--
作者：
J. Pfetzing‐Micklich;N. Wieczorek;T. Simon;B. Maass;G. Eggeler
当伪弹性NiTi合金加载并随后卸载时，应力诱导马氏体形成并消失。直接观察和表征这种合金中的局部马氏体特征是具有挑战性的。在本研究中，我们使用了一种特定的NiTi合金，其中应力诱导的马氏体在卸载过程中是热稳定的，以证明纳米压痕过程中马氏体的形成。TEM研究为纳米压痕过程中的马氏体相变提供了直接的微观结构证据。随后在TEM中的原位加热显示了应力诱导的马氏体如何转变回奥氏体。
When a pseudoelastic NiTi alloy is loaded and subsequently unloaded, stress induced martensite forms and disappears. It is challenging to directly observe and characterize the local martensitic features in such alloys. In the present study we use a specific NiTi alloy where stress induced martensite is thermally stable during unloading to prove the formation of martensite during nanoindentation. TEM investigations provide direct microstructural evidence for the martensitic phase transformation during nanoindentation. Subsequent in-situ heating in TEM shows how the stress induced martensite transforms back to austenite.