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OALib Journal期刊
ISSN: 2333-9721
费用：99美元
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Cr掺杂对Ti-Ni形状记忆合金相变和循环形变特性的影响
DOI: 10.3724/SP.J.1037.2010.00390, PP. 157-162
Keywords: Ti-Ni合金,Ti-Ni-Cr合金,形状记忆合金,相变,循环形变
Abstract:
使用示差扫描量热仪(DSC)和拉伸实验研究了Cr掺杂对550℃退火态Ti-50.8Ni(原子分数,%)形状记忆合金相变和循环形变特性的影响.结果表明,Ti-50.8Ni合金冷却/加热时发生B2→R→M/M→B2型可逆相变,掺杂0.3%Cr后所得Ti-50.8Ni-0.3Cr合金的相变类型为B2→R→M/M→R→B2,相变温度大幅度降低.室温下,Ti-50.8Ni和Ti-50.8Ni-0.3Cr合金的相组成均为母相B2,前者呈现形状记忆效应,后者呈现超弹性.随循环变形次数n的增加,Ti-50.8Ni合金的特性由形状记忆效应演变为线性超弹性,合金的应力诱发马氏体临界应力和积累残余应变迅速增加;Ti-50.8Ni-0.3Cr合金的特性由非完全超弹性演变为完全超弹性,超弹性应力-应变曲线形态比较稳定.随$n$增加,Ti-50.8Ni合金的超弹性残余应变εr减小,超弹性应变恢复率ηs增加;Ti-50.8Ni-0.3Cr合金的εr和ηs则分别稳定在较低和较高水平,超弹性稳定.
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