【摘 要】
：
铝合金是仅次于钢铁后用量最大的轻质高性能结构材料。为了提升现用铝合金的综合性能并设计新型合金，必须优化合金成分及制备工艺以获得最佳的微观结构。随着计算机技术和材料科学的发展，计算机模拟逐渐展示出巨大的优势。为此，基于实验与计算机模拟的多元多相材料制备过程微观结构演化模拟成为几年来的研究热点。精确的热物性质数据库是对多元多相材料制备过程中微观结构演变定量描述的关键，而摩尔体积是进行准确微观结构演变模
【机 构】
：
中南大学粉末冶金国家重点实验室,长沙410083
【出 处】
：
第十七届全国相图学术会议暨相图与材料设计国际研讨会
论文部分内容阅读
铝合金是仅次于钢铁后用量最大的轻质高性能结构材料。为了提升现用铝合金的综合性能并设计新型合金，必须优化合金成分及制备工艺以获得最佳的微观结构。随着计算机技术和材料科学的发展，计算机模拟逐渐展示出巨大的优势。为此，基于实验与计算机模拟的多元多相材料制备过程微观结构演化模拟成为几年来的研究热点。精确的热物性质数据库是对多元多相材料制备过程中微观结构演变定量描述的关键，而摩尔体积是进行准确微观结构演变模拟必须考虑的热物性质参数之一，其变化伴随在凝固及后续热处理过程中进而显著影响材料的性能。因此，精确描述摩尔体积至关重要。本工作严格评估了文献中纯组元至多组元体系的数据，利用CALPHAD方法，首先采用热膨胀关系与改进的Grover状态方程描述了Al、Cu、Mg、 Si纯组元溶体相随温度和压力变化的摩尔体积相关参数，随后建立了相关二元系的表述并通过Muggianu几何模型外推至三元系，由此建立了Al-Cu-Mg-Si体系溶体相随温度和压力变化的摩尔体积模型。
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