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首页> 外文期刊>Materials Science and Engineering >Improvement of shape memory effect via strengthening austenite by virtue of thermally activated process in FCC-type metastable multicomponent alloys
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Improvement of shape memory effect via strengthening austenite by virtue of thermally activated process in FCC-type metastable multicomponent alloys

机译：通过在FCC型稳定性多组分合金中通过热活化方法加强奥氏体改善形状记忆效应

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摘要

FCC-type multicomponent alloys exhibit exceptional high strength during cryogenic deformation owing to thermally activated process. Inspired by this, we proposed that the y-austenite of Fe-Mn-Cr-Si-Ni metastable multicomponent alloys would be strengthened by taking advantage of thermally activated process, and their shape memory effect would be improved by means of cryogenic deformation. As expected, the shape memory effect of Fe_(54.6)Mn_(20.7)Cr_(9.4)Si_(10.5)Ni_(4.8) metastable multicomponent alloy was enhanced by the cryogenic deformation of 77 K because y-austenite was drastically strengthened by the remarkable increment of thermally activated stress. However, the shape memory effect of Fe_(61.6)Mn_(14.2)Cr_(8.8)Si_(10.5)Ni_(4.9) and Fe_(57.3)Mn_(18.0)Cr_(9.4). Si_(1.5)Ni_(4.8) metastable multicomponent alloys was not improved by cryogenic deformation. It is ascribed to that the occurrence of ε → α' of martensitic transformation would deteriorate the shape memory effect and thus weakened the positive effect of thermally activated process. It should be an effective way to improve the shape memory effect of other metastable multicomponent alloys by virtue of thermally activated process.
机译：由于热活化的工艺，FCC型多组分合金在低温变形期间表现出卓越的高强度。由此启发，我们提出了通过利用热活化的方法来加强Fe-Mn-Cr-Si-Ni亚稳态合金的Y-奥氏体，并且通过低温变形来改善它们的形状记忆效果。如预期的，通过低温变形，Fe_（54.6）Mn_（20.7）Mn_（20.7）Mn_（9.4）Cr_（9.4）Si_（4.8）稳定性多组分合金的形状记忆效应提高了77 k的低温变形，因为Y-奥氏体通过显着增强而增强递增热活性应力。但是，FE_（61.6）MN_（14.2）CR_（8.8）SI_（10.5）NI_（4.9）和FE_（57.3）MN_（18.0）CR_（9.4）的形状记忆效应。通过低温变形，不改善Si_（1.5）Ni_（4.8）亚稳态多组分合金。它归因于马氏体转化的ε→α'的发生将使形状记忆效应恶化，从而削弱了热活化过程的积极效果。它应该是通过热敏处理改善其他亚稳态多组合合金的形状记忆效应的有效方法。

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