Evolution of microstructure of 2524 aluminum alloy during homogenization

被引：0

作者：

Liu, Hai-Quan ^{[1
]}

Xu, Xiao-Chang ^{[1
,2
]}

Wu, Feng ^{[1
]}

机构：

[1] School of Materials Science and Engineering, Central South University, Changsha, China

[2] Key Laboratory of Nonferrous Metal Materials Science and Engineering, Ministry of Education, Central South University, Changsha, China

来源：

Cailiao Rechuli Xuebao/Transactions of Materials and Heat Treatment | 2015年 / 36卷 / 11期

关键词：

X ray diffraction - Precipitates - Copper alloys - Precipitation (chemical) - Microstructure - Ternary alloys - Differential scanning calorimetry - Scanning electron microscopy - Aluminum alloys - Manganese alloys;

D O I：

暂无

中图分类号：

学科分类号：

摘要：

Microstructure evolution of 2524 aluminum alloy during homogenization was investigated by means of scanning electron microscopy(SEM), differential scanning calorimetry(DSC), electron probe micro-analysis(EPMA), wavelength dispersive X-ray spectroscopy(WDX) and X-ray diffraction. The results show that the as-cast alloy is composed of dendrite and non-equilibrium phases. Dispersoids, which become larger and well-distributed with the extension of holding time, precipitate in the grains when the alloy is homogenized above 300. The non-equilibrium phases gradually dissolve and become spherical at high temperature. The residual unsoluble phase is Al12CuMn2with PFZ (precipitate free zone)around it. The mechanism of the PFZ formation is depletion of solutes. The cooling mode affects the final microstructure of the alloy. Precipitates become dispersed when cooling in air, while corse S phase is observed when cooling in the furnace. © 2015, Editorial Office of TRANSACTIONS OF MATERIALS AND HEAT TREATMENT. All right reserved.

引用

页码：47 / 53