Microstructure and martensitic transformation of NiTiHfSc high temperature shape memory alloys
Microstructure and martensitic transformation of NiTiHfSc high temperature shape memory alloys
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NiTiHfSc高温形状记忆合金的显微组织和马氏体相变
DOI：
10.1016/j.jallcom.2018.11.294
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发表时间：
2019-03
影响因子：
6.2
通讯作者：
Y. F. Zheng
中科院分区：
文献类型：
--
作者：
X.M. Fan;S.Y. Sun;Y. X. Tong;L. Li;B. Tian;F. Chen;Y. F. Zheng
本文研究了Ni49Ti36-xHf15Scx（x = 0,0.5,1,2 ）的显微组织和马氏体相变。对%)合金进行了研究。结果表明，Sc的加入对合金的显微组织有显著影响。Sc加入后，在室温下除了B19′马氏体和（Ti,Hf）2Ni相外，还存在sc2o3相。当Sc含量不小于1 at时。%时，（Ti,Hf）2Ni相的链状形貌变为球形形貌。经冷却和加热后，合金表现为单步马氏体相变和反向相变。随着Sc含量的增加，转变温度以每1 at降低21℃的速率降低。%Sc产生的(Ti+Hf+Sc)/Ni比降低。Sc的加入对马氏体相变具有固溶强化作用，能有效提高马氏体相变的热循环稳定性，经过10次循环后，ni49ti35.5 hf15sc0.5合金的相变峰温度变化仅为4.7 ℃。
In present work, microstructure and martensitic transformation of Ni49Ti36-xHf15Scx(x = 0, 0.5, 1, 2 at.%) alloys were investigated. The results show that the Sc addition significantly influences the microstructure of the alloy. After the addition of Sc, Sc2O3phase presents besides B19′ martensite and (Ti,Hf)2Ni phase at room temperature. When the Sc content is no less than 1 at.%, the chain-like morphology of (Ti,Hf)2Ni phase changes to spherical-like one. Upon cooling and heating, these alloys show single-step martensitic transformation and its reverse transformation. With increasing Sc content, the transformation temperatures are reduced at a rate of 21 °C per 1 at.%Sc resulting from the reduced (Ti+Hf+Sc)/Ni ratio. The addition of Sc is effective in improving the thermal cycling stability of martensitic transformation because of the solid-solution strengthening of Sc. After ten cycles, the change of transformation peak temperature of Ni49Ti35.5Hf15Sc0.5alloy is only 4.7 °C.
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影响因子：
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影响因子：
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