Effect of Solution Treatment on Mechanical and Corrosion Behaviors of 6082-T6 Al Alloy

被引：30
作者：
Kumar N. [1 ]
Goel S. [1 ]
Jayaganthan R. [1 ,4 ]
Brokmeier H.-G. [2 ,3 ]
机构：
[1] Department of Metallurgical and Materials Engineering, Indian Institute of Technology Roorkee, Roorkee
[2] Institute of Materials Science and Engineering, Clausthal University of Technology, Agricolastrasse 6, Clausthal-Zellerfeld
[3] Helmholtz Zentrum Geesthacht, Max Planck Straße 1, Geb 33, Geesthacht
[4] Department of Engineering Design, Indian Institute of Technology Madras, Chennai
来源：
Metallography, Microstructure, and Analysis | 2015年 / 4卷 / 05期
关键词：
Aluminum alloys; Corrosion; Precipitates; Solution treatment;
D O I：
10.1007/s13632-015-0219-z
中图分类号：
学科分类号：
摘要：
The mechanical and corrosion behavior of Al alloy 6082-T6 subjected to solution heat treating condition at temperatures varying from 400 to 600 °C and soaking times of 3–24 h have been investigated. Solution heat treating at 550 °C for 24 h led to the dissolution of the Mg2Si and AlSi6Mg3Fe precipitates into the matrix, and the Al12(FeMn)3Si2 phase transformed into Al85(Fe0.28Mn0.72)14Si phase. The solution-treated alloy showed equiaxed grain morphology with an average grain size of 85.7 µm. Increasing the solution heat treating temperature beyond 550 °C caused a reduction in corrosion resistance of the alloy. The pitting potential increased due to the presence of the anodic phase Mg2Si (dissolved at 550 °C) in Al matrix and it decreased with the formation of cathodic phases such as AlSi6Mg3Fe and Al12(FeMn)3Si2 (dissolved at 550 °C/24 h) in the alloy. General corrosion resistance of the alloy increased with decreasing Mg2Si concentration in the Al matrix. The optimum solution heat treating condition of 550 °C for 24 h resulted in an improvement in hardness (63 VHN), ultimate tensile strength (UTS—208 MPa), and pitting potential (−675 mV) and uniform corrosion potential (−1.255 mV) of 6082 Al alloy. © 2015, Springer Science+Business Media New York and ASM International.
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页码：411 / 422
页数：11
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