Interface mobility in Ni49.8Ti42.2Hf8 shape memory alloy
Interface mobility in Ni49.8Ti42.2Hf8 shape memory alloy
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DOI：
10.1016/s1359-6454(02)00151-9
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发表时间：
2002-08
期刊：
影响因子：
9.4
通讯作者：
F. Dalle;E. Perrin;P. Vermaut;M. Masse;R. Portier
中科院分区：
文献类型：
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作者：
F. Dalle;E. Perrin;P. Vermaut;M. Masse;R. Portier
与NiTi合金相比，Ni49.8Ti42.2Hf8形状记忆合金具有较好的力学性能。这与（i）三元合金惯习面的变形和（ii）观察到的（001）机械孪晶有关，这有助于适应Ni49.8Ti42.2Hf8合金的塑性变形，而不是NiTi合金。习惯层面的扭曲限制了它的流动性，这一点的证据是由内部摩擦带来的。（001）机械孪晶导致在拉伸变形的马氏体板条中出现非常薄的显微组织。提出了一个模型作为产生这种补充机械孪生的可能机制：在（001）平面上重复滑动a/2将产生与观察到的微观结构一致的平移（001）微孪生。这些微孪晶可能是由伯格斯矢量a的位错解离产生的。
The ternary Ni49.8Ti42.2Hf8shape memory alloy shows mechanical peculiarities compared with NiTi alloy. These are linked to (i) the distortion of the habit plane of the ternary alloy and (ii) the observed (001) mechanical twinning, which helps to accommodate plastic deformation in Ni49.8Ti42.2Hf8and not in NiTi alloy. The distortion of the habit plane limits its mobility, evidence of which being brought here by internal friction. The (001) mechanical twinning causes the appearance of a very thin microstructure in martensite laths deformed by tension. A model is proposed as a possible mechanism giving birth to this supplementary mechanical twinning: repeated slips by a/2 on (001) planes would create translative (001) micro-twins coherent with the observed microstructure. These micro-twins may be produced by the dissociation of dislocations with the Burgers vector a.