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热/强磁场耦合时效对富镍Ti-Ni形状记忆合金相变行为的影响

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Indexed by:期刊论文

Date of Publication:2006-12-30

Journal:中国有色金属学报

Included Journals:Scopus、EI、PKU、ISTIC、CSCD

Volume:16

Issue:12

Page Number:2005-2009

ISSN No.:1004-0609

Key Words:Ti-Ni形状记忆合金;强磁场;时效;相变行为

Abstract:采用示差扫描量热仪(DSC)和透射电子显微镜(TEM),研究热/强磁场耦合时效对Ti-50.6%Ni(摩尔分数)形状记忆合金中Ti3Ni4相析出及相变行为的影响.结果表明:经过500℃、2.5 h热/强磁场耦合时效处理后,Ti-50.6%Ni合金呈现典型的三阶段相变,即晶界附近的B2-R转变、晶内的B2-B19′转变和晶界附近的R-B19′转变;随着磁感应强度的增加,B2-R相变峰和B2-B19′相变峰均向低温区漂移,而R-B19′相变峰位基本保持不变.TEM观察显示,热/强磁场耦合时效后,晶界附近的Ti3Ni4析出相数量明显减少,表明热/强磁场耦合时效可能阻碍了晶粒内部的Ni向晶界周围迁移,抑制了Ti3Ni4相的形核.

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