SOLIDIFICATION MORPHOLOGY AND STRUCTURE OF CAST Al-Li 2090 ALLOY AT LOW SUPERHEATS

机译：低过热度时铸造Al-Li 2090合金的凝固形态和组织

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The effect of low superheat on solidification morphology and microstructure of Al-Li 2090 alloy has been investigated using the Magnetic Suspension Melting (MSM) process, which is capable of remelting and casting aluminum at superheats as low as 1℃. In this study, the metal was solidified unidirectionally in a cylindrical ceramic mold with a stainless steel chill plate at the bottom. The castings were analyzed by microscopic and image analysis techniques. Metallographic examination showed that the cast metal exhibited fine grained globular structure throughout the ingot, with an average grain size of about 80 μm. The average grain size was found to be independent on both the cooling and solidification rates in the mold. Transmission electron microscopy (TEM) examination showed that the matrix exhibits a superlattice type structure of coherent δ'(Al_3Li) phase with minor amount of T_1 (Al_2CuLi) needles in the matrix. Chemical analysis of the ingots showed typical inverse segregation of Cu in aluminum alloys in the directional solidification, and very little segregation of Zr.

机译：利用磁悬浮熔炼（MSM）技术研究了低过热度对Al-Li 2090合金凝固形态和微观组织的影响，该方法能够在低至1℃的过热度下重熔铝。在这项研究中，金属在底部带有不锈钢冷却板的圆柱形陶瓷模具中单向凝固。通过显微镜和图像分析技术分析铸件。金相检查表明，铸造金属在整个铸锭中均呈现出细粒状的球状结构，平均晶粒尺寸约为80μm。发现平均晶粒尺寸与模具中的冷却和固化速率无关。透射电子显微镜（TEM）检查表明，基体具有相干δ'（Al_3Li）相的超晶格型结构，基体中有少量的T_1（Al_2CuLi）针。铸锭的化学分析表明，定向凝固过程中铝合金中典型的Cu逆偏析，而Zr偏析极少。

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来源
《TMS(The Minerals, Metals amp; Materials Society) Annual Meeting and Symposium on Solidification of Aluminum Alloys; 20040314-20040318; Charlotte,NC; US》|2004年|P.321-328|共8页
会议地点 Charlottee NC(US);Charlottee NC(US)
作者
Chandan Mahato; Mohamed Shamsuzzoha; Nagy El-Kaddah;
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作者单位

Department of Metallurgical and Materials Engineering The University of Alabama, Tuscaloosa, AL 35487 USA;

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原文格式 PDF
正文语种 eng
中图分类合金学与各种性质合金;
关键词
Al-Li alloys; solidification; macrostructure; magnetic suspension melting;

机译：铝锂合金凝固宏观组织磁悬浮熔化;

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SOLIDIFICATION MORPHOLOGY AND STRUCTURE OF CAST Al-Li 2090 ALLOY AT LOW SUPERHEATS

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