Microstructure and martensitic transformation of Ti49Ni51 − xHfx high temperature shape memory alloys
Microstructure and martensitic transformation of Ti49Ni51 − xHfx high temperature shape memory alloys
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DOI：
10.1016/j.matlet.2009.05.069
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发表时间：
2009-08
影响因子：
3
通讯作者：
Y. Tong;Feng Chen;B. Tian;Li Li-Li;Yufeng Zheng
中科院分区：
文献类型：
--
作者：
Y. Tong;Feng Chen;B. Tian;Li Li-Li;Yufeng Zheng
本文研究了Ti 49 Ni 51 −xHfx（x=3-15）合金的显微组织和马氏体相变。Ti 49 Ni 51 − xHfx合金的室温组织由B19′马氏体和（Ti，Hf）2Ni相组成。马氏体相变行为具有单阶段相变的特征。随着Hf含量的增加，转变温度从75 °C增加到279 °C，这是由于价电子浓度的降低，表明Hf对Ni的替代在提高转变温度方面是有效的。结果表明，Ti49 Ni 51 − xHfx形状记忆合金是一种具有潜在应用前景的高温形状记忆合金。
In present work, the microstructure and martensitic transformation of Ti49Ni51−xHfx(x=3–15) alloys were studied. The microstructure of Ti49Ni51−xHfxalloys consists of B19′ martensite and (Ti,Hf)2Ni phase at room temperature. The martensitic transformation behavior is characterized by a single-stage transformation. With increasing Hf content, the transformation temperature increases from 75 to 279 °C resulting from the reduced valence electron concentration, indicating that the replacement of Hf for Ni is effective in increasing the transformation temperatures. The results suggest that the Ti49Ni51−xHfxshape memory alloy is one of potential candidates for high temperature applications.