Al-Si-Mg(356)合金不稳态水平凝固过程中的显微组织演化（英文）

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英文篇名：Microstructural evolution during unsteady-state horizontal solidification of Al-Si-Mg(356) alloy 作者：J.O.LIMA ; C.R.BARBOSA ; I.A.B.MAGNO ; J.M.NASCIMENTO ; A.S.BARROS ; M.C.OLIVEIRA ; F.A.SOUZA ; O.L.ROCHA 英文作者：J.O.LIMA;C.R.BARBOSA;I.A.B.MAGNO;J.M.NASCIMENTO;A.S.BARROS;M.C.OLIVEIRA;F.A.SOUZA;O.L.ROCHA;Federal Institute of Education, Science and Technology of Pará, IFPA;Federal University of Pará, Institute of Technology, UFPA; 关键词：Al-Si-Mg合金 ; 显微组织演化 ; 枝晶间距 ; 瞬时热流 英文关键词：Al-Si-Mg alloy;;microstructural transition;;dendrite arm spacing;;transient heat flow 中文刊名：ZYSY 英文刊名：中国有色金属学报(英文版) 机构：Federal Institute of Education, Science and Technology of Pará, IFPA;Federal University of Pará, Institute of Technology, UFPA; 出版日期：2018-06-15 出版单位：Transactions of Nonferrous Metals Society of China 年：2018 期：v.28 基金：financial support provided by IFPA—Federal Institute of Education, Science and Technology of Pará, UFPA—Federal University of Pará, and CNPq—The Brazilian Research Council (Grants 472745/2013-1, 308784/2014-6 and 302846/2017-4);; FAPESPA—Amazon Foundation of Support to Study and Research (Grants ICAAF 064/2016);; CAPES—Coordination of Superior Level Staff Improvement, Brazil 语种：英文; 页：ZYSY201806002 页数：11 CN：06 ISSN：43-1239/TG 分类号：18-28

摘要

汽车和航空航天工业对减少运载工具重量的需求不断增加,这就需要发展改良的结构铝基合金。因此,本文作者研究设计Al-7%Si-0.3%Mg合金的水平凝固实验。研制并使用水冷式水平定向凝固装置。运用金相、光学显微镜、扫描电镜等传统技术表征材料的显微组织。用Thermo-Calc软件模拟含0.17%Fe(质量分数)合金的凝固路径。研究生长速度(V_L)、冷却速度(T_C)和凝固局部时间(t_(SL))等热力学参数对显微组织形成和枝晶显微组织演化的影响。当V_L和T_C值分别为0.82~0.98 mm/s和1.71~2.55°C/s时,柱状晶向等轴晶转变(CET)。通过测量一次和二次枝晶间距(分别为λ_1和λ_2)对显微组织进行表征。提出实验性定律:λ_(1,2)=f(V_L,T_C),λ_2=f(t_(SL));并观察到枝晶区包含以下共晶混合物:α(Al)+Si+π-Al_8Mg_3Fe Si_6+θ-Mg_2Si。
        The increasing demand for reducing vehicle weight in the automotive and aerospace industries has raised the need to develop improved structural aluminum-based alloys. Thus, horizontal solidification experiment with the Al-7%Si-0.3%Mg(mass fraction) alloy was carried out. A water-cooled horizontal directional solidification device was developed and used. Microstructural characterization was carried out using traditional techniques of metallography, optical microscopy and SEM microscopy. The Thermo-Calc software was used to generate the solidification path of the investigated alloy with addition of 0.17% Fe(mass fraction). The effects of the thermal parameters such as the growth rate(V_L), cooling rate(T_C) and solidification local time(t_(SL)) on the formation of the macrostructure and on the dendritic microstructure evolution were evaluated. A columnar to equiaxed transition(CET) was found for VL and TC values from 0.82 to 0.98 mm/s and from 1.71 to 2.55 °C/s, respectively. The microstructure was characterized by the measurement of the primary and secondary dendrite arm spacings(λ_1 and λ_2, respectively). Experimental laws of λ_1 =f(V_L, T_C) and λ_2 =f(t_(SL)) were proposed. It is observed that the interdendritic region is composed of the following eutectic mixture: a(Al)+Si+p-Al_8 Mg_3 Fe Si_6+q-Mg_2 Si.

引文

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