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OALib Journal期刊
ISSN: 2333-9721
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Al-11.80Cu-24.22Mg三元包共晶合金的凝固机制
DOI: 10.3724/SP.J.1037.2011.00346, PP. 1464-1469
Keywords: 三元包共晶,液淬,组织演化,凝固机制
Abstract:
采用液淬方法对Al-11.80Cu-24.22Mg(质量分数,%)三元包共晶合金在不同温度下淬火,而后,对其相组成和凝固组织进行了研究,对凝固组织的演化规律以及凝固机制进行了分析.实验结果表明,该合金凝固过程中确实发生了三元包共晶反应,初生相为S相(Al2CuMg),包共晶组织为α-Al相和T相(Al6CuMg4)组成,最终凝固组织由残余初生S相、包共晶组织(α-Al+T)、两相共晶(α-Al+T)及三相共晶(α-Al+T+β)组成;虽然包共晶组织中和两相共晶中含有相同的相,即α-(Al)相和T相,但二者的组织形态不同,包共晶组织呈“条带状”,而两相共晶呈规则的“蛛网状”和“球状”.此外,三元包共晶反应时,包共晶组织依附于初生S相的周围生长,随着冷却速率的增加,三元包共晶反应变慢甚至被抑制,致使初生S相剩余而滞留在基体中.
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