Abstract An Al-Si-Cu-based cast alloy was modified with transition metal elements Zr, V and Ti to achieve enhanced mechanical performance at elevated temperatures. Multiple microstructural characterization techniques were used to investigate the solidification segregation behavior of these transition metal elements and their partitioning to the primary intermetallic phases and secondary precipitates. Three transition metal elements were shown to segregate into the dendrite center to varying degrees. Two primary intermetallic phases enriched with different amounts of transition metal elements were identified as D022 and D023 phases. Zr was observed to concentrate much more than V and Ti in the nano-size secondary L12 precipitates, which formed in the matrix during post-solidification heat treatment.

中文翻译：

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Al-Si-Cu基合金中过渡金属元素的分布

摘要 采用过渡金属元素 Zr、V 和 Ti 对 Al-Si-Cu 基铸造合金进行改性，以提高高温下的机械性能。多种显微结构表征技术被用于研究这些过渡金属元素的凝固偏析行为及其分配到主要金属间相和二次沉淀物。三种过渡金属元素显示出不同程度地偏析到枝晶中心。两种富含不同量过渡金属元素的主要金属间相被确定为 D022 和 D023 相。观察到在凝固后热处理期间在基体中形成的纳米级二次 L12 沉淀物中，Zr 比 V 和 Ti 浓缩得多。