After-effects induced by interactions between hydrogen and the martensite transformation in Ni-Ti superelastic alloy
After-effects induced by interactions between hydrogen and the martensite transformation in Ni-Ti superelastic alloy
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Ni-Ti超弹性合金中氢与马氏体相变相互作用引起的后效应
DOI：
10.1080/09500839.2017.1363423
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发表时间：
2017
影响因子：
1.2
通讯作者：
Jun'ichi Sakai
中科院分区：
文献类型：
--
作者：
Ken'ichi Yokoyama;Yuki Hirata;Jun'ichi Sakai
本文研究了一种Ni-Ti超弹性合金在室温空气中时效时，氢与应力诱发马氏体相变之间的动态相互作用对拉伸性能恢复的影响。试样在充氢后立即进行单应力诱发马氏体和逆相变。在拉伸试验时，脆性断裂发生在应力诱发马氏体相变后的马氏体相的弹性变形区域的后半部分。在拉伸试验之前的时效时，断裂发生在应力诱发马氏体转变期间。此外，纳米和微观形貌的试样的断裂表面的脆性外部部分的变化，通过老化。因此，拉伸性能显著恶化，而不是恢复，通过老化。目前的结果清楚地表明，氢与应力诱发的马氏体相变之间的动态相互作用对Ni-Ti超弹性合金的氢脆具有严重的后效作用。
The effects of dynamic interactions between hydrogen and a stress-induced martensite transformation on the recovery of deteriorated tensile properties by ageing in air at room temperature have been investigated for a Ni–Ti superelastic alloy. A specimen is subjected to single stress-induced martensite and reverse transformations immediately after hydrogen charging. Upon tensile testing, brittle fracture occurs in the latter half of the elastic deformation region of the martensite phase after the stress-induced martensite transformation. Upon ageing before the tensile test, fracture occurs during the stress-induced martensite transformation. In addition, the nano- and micro-morphologies of the brittle outer part of the fracture surface of the specimen are changed by ageing. Thus, the tensile properties markedly deteriorate, rather than recover, by ageing. The present results clearly indicate that dynamic interactions between hydrogen and the stress-induced martensite transformation have serious after-effects on hydrogen embrittlement of Ni–Ti superelastic alloy.