Intermetallic phase evolution of 7050 aluminum alloy during homogenization

被引：120
|
作者：
Deng, Ying [1 ]
Yin, Zhimin [1 ]
Cong, Fuguan [2 ]
机构：
[1] Cent S Univ, Sch Mat Sci & Engn, Changsha 410083, Peoples R China
[2] NE Light Alloy Co Ltd, Harbin 150060, Peoples R China
来源：
INTERMETALLICS | 2012年 / 26卷
关键词：
Intermetallics; Miscellaneous; Phase transformation; Casting; Microstructure; Electron microprobe; FICKS 1ST LAW; ZR-TI ALLOYS; PRECIPITATION EVOLUTION; AL-ZR; MICROSTRUCTURAL EVOLUTION; DISPERSOID PRECIPITATION; HEAT-TREATMENT; AS-CAST; ZIRCONIUM;
D O I：
10.1016/j.intermet.2012.03.006
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：
Intermetallic phase evolution of 7050 aluminum alloy during homogenization was investigated in detail by optical microscopy, scanning electron microscopy, energy dispersive spectrometry, differential scanning calorimetry, electron probe micro-analysis and X-ray diffraction methods. The results show that severe dendritic segregation exists in as-cast alloy. The dissolvable intermetallic phases in as-cast alloy consist of equilibrium eta (MgZn2) phase, Cu and Mg enriched non-equilibrium aluminides and Cu enriched non-equilibrium aluminides. During homogenization, Cu and Mg enriched non-equilibrium aluminides, Cu enriched non-equilibrium aluminides and eta (MgZn2) phase gradually dissolve into matrix. Equilibrium S (Al2CuMg) intermetallic phase nucleates and grows along the grain boundaries, and it disappears completely after multi-step homogenization. The proper homogenization processing is 400 degrees C x 10 h + step470 degrees C x 24 h + step485 degrees C x 4 h, which is consistent with the results of homogenizing kinetic analysis. (C) 2012 Elsevier Ltd. All rights reserved.
引用
收藏
页码：114 / 121
页数：8
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