An abnormal two-way shape memory effect in a rapidly solidified Ni51Ti49 alloy induced by low temperature constrained aging

An abnormal two-way shape memory effect in a rapidly solidified Ni51Ti49 alloy induced by low temperature constrained aging
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低温约束时效诱导快凝Ni51Ti49合金异常双向形状记忆效应

DOI:
10.1016/j.scriptamat.2018.02.016
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发表时间:
2018-05
期刊:
影响因子:
6
通讯作者:
Zhang X. P.
Zhang X. P.
中科院分区:
材料科学1区
文献类型:
--
作者:
Li Y. Y.;Yao X. Y.;Cao S.;Ma X.;Zeng C. Y.;Zhang X. P.

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在较低温度下(约385℃以下时效1 h)进行约束时效处理的快速凝固ni51ti49合金带材存在异常的双向形状记忆效应(TWSME),表现为冷却时马氏体转变过程中带材向约束位置弯曲,与正常的TWSME有明显区别。超细纳米ni4ti3析出相产生的相干应力场弱于残余应力场,而残余应力场主导马氏体相变,导致与正常TWSME相反方向的弯曲。
An abnormal two-way shape memory effect (TWSME) is found in a rapidly solidified Ni51Ti49alloy strip undergoing constrained aging treatment at relatively low temperatures (e.g., approximately below 385 °C for aging time of 1 h), which embodies the bending of the strip toward constrained position during martensitic transformation on cooling, showing stark difference from normal TWSME. The abnormal TWSME of the alloy is caused by weaker coherent stress field produced by ultrafine nano-sized Ni4Ti3precipitates than the residual stress field, whereas the latter dominates martensitic transformation and leads to bending with the direction opposite to that of normal TWSME.
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