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OALib Journal期刊
ISSN: 2333-9721
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孔隙对NiTi形状记忆合金中B2-R相变影响的相场模拟
DOI: 10.3724/SP.J.1037.2010.00422, PP. 129-139
Keywords: 多孔NiTi形状记忆合金,B2-R相变,生长动力学,相场法,形貌演化
Abstract:
建立了适用于含孔隙NiTi合金中B2-R相变的相场模型,并用该相场模型研究了多孔NiTi合金中B2-R转变的微观组织演化过程以及孔隙率和孔尺寸对R相变体生长动力学行为的影响.多孔NiTi合金中R相变体以相互协调的方式形成“带状”的三维结构和“鱼骨”状的二维组织,变体之间形成的孪晶面包括{101}B2和{001}B22种,4组变体相交于B2;这些结果与致密NiTi合金B2-R相变过程相同.多孔NiTi合金中R相优先在孔周围形核,且较大的孔周围有较多的变体形核;R相变体的平均尺寸随孔隙率增大而逐渐减小,随孔径增大而增加;相对于规则圆孔,不规则孔隙可导致R相变体尺寸略微减小;变体的尺寸均匀性则随孔隙率增大而提高,但对孔径大小和孔形状不敏感;孔隙数量越多且孔径越小,则B2-R转变越倾向于产生均匀而细密的R相组织.
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