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OALib Journal期刊
ISSN: 2333-9721
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热处理对Ti-Ni-Cr低温超弹性合金相变行为的影响
DOI: DOI：10.3724/SP.J.1037.2009.00554, PP. 329-333
Keywords: Ti-50.8Ni-0.3Cr合金,形状记忆效应,超弹性,相变
Abstract:
用示差扫描量热仪研究了退火和时效工艺对Ti-50.8Ni-0.3Cr(原子分数,%)低温超弹性合金相变行为的影响.结果表明,350-450℃退火态Ti-50.8Ni-0.3Cr合金冷却/加热时发生A→R/R→A型可逆相变,500℃退火态合金发生A→R→M/M→R→A型相变,550-600℃退火态合金发生A→R→M/M→A型相变,650℃以上退火态合金不发生相变.退火时间对合金相变行为影响不大.随时效时间tag延长,300℃时效态合金的相变类型保持为A→R/R→A,400℃时效态合金发生由A→R/R→A向A→R→M/M→R→A转变,500℃时效态合金发生由A→R→M/M→R→A向A→R→M/M→A转变.随退火温度升高,合金的R相变温度δR先升高后降低,M相变温度δM升高,M相变热滞ΔδM降低.合金经300-500℃时效后,δR400>δR300>δR500.随tag延长,δR和δM先快速升高后趋于稳定,ΔδM先快速降低后趋于稳定.退火和时效态合金的R相变热滞均在4℃左右.
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