Microstructure and martensitic transformation of NiTiHfSc high temperature shape memory alloys

被引：19
作者：
Fan, X. M. [1 ]
Sun, S. Y. [1 ]
Tong, Y. X. [1 ]
Li, L. [1 ]
Tian, B. [1 ]
Chen, E. [1 ]
Zheng, Y. F. [2 ]
机构：
[1] Harbin Engn Univ, Coll Mat Sci & Chem Engn, Inst Mat Proc & Intelligent Mfg, Harbin 150001, Heilongjiang, Peoples R China
[2] Peking Univ, Coll Engn, Dept Mat Sci & Engn, Beijing 100871, Peoples R China
来源：
JOURNAL OF ALLOYS AND COMPOUNDS | 2019年 / 779卷
基金：
中国国家自然科学基金;
关键词：
Intermetallics; NiTiHfSc high temperature shape memory alloys; Phase transitions; Microstructure; PHASE-TRANSFORMATION; MECHANICAL-BEHAVIOR; HF; TRANSITION;
D O I：
10.1016/j.jallcom.2018.11.294
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
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, Sc2O3 phase presents besides B19' martensite and (Ti,Hf)(2)Ni phase at room temperature. When the Sc content is no less than 1 at.%, the chain-like morphology of (Ti,Hf)(2)Ni 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 degrees 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 Ni49Ti35.5Hf15Sc0.5 alloy is only 4.7 degrees C. (C) 2018 Elsevier B.V. All rights reserved.
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页码：212 / 218
页数：7
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