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OALib Journal期刊
ISSN: 2333-9721
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在脉冲电流或脉冲磁场作用下ly12合金的凝固组织
Keywords: 脉冲电流,脉冲磁场,凝固组织,结晶游离
Abstract:
？在ly12铝合金凝固的过程中施加脉冲电流或脉冲磁场,研究脉冲电流或脉冲磁场对这种合金凝固组织的影响。结果表明,脉冲电流和脉冲磁场均可使晶粒明显细化、等轴化。在脉冲电磁场作用下金属凝固组织的晶粒细化机制为：在脉冲电磁场的作用下剧烈的强迫对流促进晶粒从型壁上游离，大大增加金属熔体的形核率，导致晶粒细化；温度相对均匀使得游离的晶粒得以保存下来，抑制了晶粒在某个方向上的优先生长，从而抑制了树枝晶的形成。
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