金属学报  2011, Vol. 47 Issue (11): 1464-1469    DOI: 10.3724/SP.J.1037.2011.00346

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Al-11.80Cu-24.22Mg三元包共晶合金的凝固机制

闫二虎1), 李新中1), 徐达鸣1), 赵光伟1), 周建新2), 郭景杰1), 傅恒志1)

1) 哈尔滨工业大学材料科学与工程学院, 哈尔滨 150001 2) 华中科技大学模具技术国家重点实验室, 武汉 430074

SOLIDIFICATION MECHANISM OF TERNARY QUASIPERITECTIC ALLOY OF Al-11.8Cu-24.22Mg

YAN Erhu1), LI Xinzhong1), XU Daming1), ZHAO Guangwei1), ZHOU Jianxin2), GUO Jingjie1), FU Hengzhi1)

1) School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001 2) State Key Lab of Mold & Die Technology, Huazhong University of Science and Technology, Wuhan 430074

闫二虎 李新中 徐达鸣 赵光伟 周建新 郭景杰 傅恒志. Al-11.80Cu-24.22Mg三元包共晶合金的凝固机制[J]. 金属学报, 2011, 47(11): 1464-1469.
, , , , , . SOLIDIFICATION MECHANISM OF TERNARY QUASIPERITECTIC ALLOY OF Al-11.8Cu-24.22Mg[J]. Acta Metall Sin, 2011, 47(11): 1464-1469.

摘要 参考文献 相关文章 Metrics 全文: PDF(2619 KB)   摘要: 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. 关键词 ： 三元包共晶,  液淬,  组织演化,  凝固机制     Abstract：In the field of condensed matter physics and materials science, it is of great importance to investigate the microstructures, properties and solidification regularities of liquid metals. In the last few decades, the theories of solidification of binary alloys, such as dendritic growth and eutectic growths have been built. Great progress has also been made on the study of monetectic and peritectic alloys. But a solidification theory on ternary quasiperitectic alloys has not been established up to now. The study of the solidification process of quasiperitectic alloys will provide a basic work for solidification theories of ternary alloys. The master alloy of Al-11.8Cu-24.22Mg was prepared from pure Al (99.99%), pure Mg (99.99%) and Al-54.2Cu in a resistance furnace under CO2 and SF6 (volume proportion is 40∶1) atmosphere. The melted alloy (840-850℃) was pouring into different quenching graphite crucibles at the same time, and the cooling curves were recorded by a sixteen channels temperature recorder. The graphite crucible was quenched into cold--water immediately for rapid cooling at the preplanned quenching temperature. After the experiment, the microstructures of the sample were analyzed by SEM, with EDS analysis. The experiment result indicates that the primary phase is identified as S (Al2CuMg) and the quasiperitectic phases are α-Al and T (Al6CuMg4). The solidification microstructure is composed of remnant primary phase, quasiperitectic phases, binary eutectic and ternary eutectic. Although the quasiperitectic phases and binary eutectic are composed of the same phases (α-Al+T(Al6CuMg4)), their structures are different. The former structure presents strip form and the later present dendritic form. The ternary eutectic reaction is suppressed and the remnant primary S phase is reserved in the matrix with non-equilibrating crystallization. Key words： ternary quasiperitectic    quenching techniques    microstructure evolution    solidification mechanism 收稿日期: 2011-06-02      ZTFLH:  TG249.9   基金资助: 国家自然科学基金项目51071062和50801019, 华中科技大学模具技术国家重点实验室开放基金项目2011-P03及国家重点基础发展计划项目2011CB610406资助 作者简介: 闫二虎, 男, 1986年生, 博士生 服务 把本文推荐给朋友 加入引用管理器 E-mail Alert RSS 作者相关文章 闫二虎 李新中 徐达鸣 赵光伟 郭景杰 傅恒志 44.8K 链接本文: https://www.ams.org.cn/CN/10.3724/SP.J.1037.2011.00346      或      https://www.ams.org.cn/CN/Y2011/V47/I11/1464 [1] Li L, Lu X Y, Dai F P. 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