Microstructure evolution of the 1469 Al-Cu-Li-Sc alloy during homogenization

被引：89

作者：

Jia, Min ^{[1
]}

Zheng, Ziqiao ^{[1
]}

Gong, Zhu ^{[1
]}

机构：

[1] Cent S Univ, Sch Mat Sci & Engn, Changsha 410083, Peoples R China

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2014年 / 614卷

关键词：

Aluminum alloy; Sc; W phase; Segregation; Homogenization; EPMA; ALUMINUM-ALLOYS; SOLIDIFICATION BEHAVIOR; MECHANICAL-PROPERTIES; AL(SC) ALLOYS; MINOR SC; SCANDIUM; ZR; PRECIPITATION; ADDITIONS; SYSTEM;

D O I：

10.1016/j.jallcom.2014.06.033

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The present work aims to clarify the formation of the W phase (AlCuSc) and its formation time in the high Cu content alloy with Sc addition. The microstructure evolution during the two-step homogenization annealing process was investigated in the 1469 Al-Cu-Li-Sc alloy. No evidences of the Al3Sc phase and the W phase were found in the solidification structure. The arrays of the W phases were found to form after homogenization. The AlCu phases with traces of Sc that formed during solidification suppose to be the precursor of the W phases, and then transform into the W phases by consuming the Sc atoms that fixed in the supersaturate solid solution. The formation of the W phase inhibits the precipitation of the Al3Sc phase. A corresponding model of the W phase formation mechanism is proposed. (C) 2014 Elsevier B.V. All rights reserved.

引用

页码：131 / 139

页数：9

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