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金属学报 2006

外加应变对Ti-25Al-10Nb合金显微组织影响的相场法模拟

, PP. 549-553

郭巍,宗亚平,左良,王云志

Keywords: Ti-Al-Nb合金,外加应变场,显微组织

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Abstract:

利用相场法研究了外加应变场对Ti-25Al-10Nb合金中α2→O相变组织的影响.研究表明,除了外加应变的大小之外,外加应变方向对O相析出组织也有明显影响.模拟得出,外加应变方向对O相体积分数的影响可达24%,外应变大小对O相体积分数的影响可达60%.当沿着α2相的〈2-1-10〉方向施加单轴压应变且应变量εamp大于0.5εs(相变应变量)时,合金会形成α2+O相的全片层显微组织,有望显著改善合金的性能.

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