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利用电阻法、低温动态电子显微术和低温动态X射线衍射法研究了FeNiCoTi合金不同时间时效处理对马氏体相变和形貌的影响。结果表明,合金经过953K×3h时效处理后硬度最高,达535HV,在低温下发生马氏体可逆相变而生成具有热弹性的薄片状马氏体,具有良好的形状记忆效应。延长时效时间,硬度逐渐降低,相变点升高,低温下发生不完全马氏体可逆相变,除薄片状马氏体外,还生成部分非热弹性的断续状马氏体。当时效时间超过25h 后,合金在低温下发生完全不可逆的马氏体相变而生成透镜状马氏体。
The effects of different aging treatments on martensitic transformation and morphology of FeNiCoTi alloys were studied by means of resistance method, low temperature dynamic electron microscopy and low temperature dynamic X-ray diffraction. The results show that the alloy has the highest hardness after aging treatment at 953K × 3h, reaching 535HV. The martensitic reversible phase transformation occurs at low temperature to produce thermoelastic flaky martensite with good shape memory effect. Extend the aging time, the hardness gradually decreased, the transformation point increased, low temperature incomplete martensitic reversible phase transformation, in addition to lamellar martensite, but also generate some non-thermoelastic discontinuous martensite. When the aging time exceeds 25h, the alloy undergoes complete irreversible martensitic transformation at low temperature to produce lenticular martensite.