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Effects of Mn Content on Microstructure and Mechanical Properties of 6061 Aluminum Alloy |
ZHANG Xinming** KE Bin TANG Jianguo LIU Shengdan DENG Yunlai |
(School of Materials Science and Engineering, Central South University, Changsha 410083) |
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Cite this article:
ZHANG Xinming** KE Bin TANG Jianguo LIU Shengdan DENG Yunlai. Effects of Mn Content on Microstructure and Mechanical Properties of 6061 Aluminum Alloy. Chinese Journal of Materials Research, 2013, 27(4): 337-341.
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Abstract The effects of Mn content on the homogenized microstructure, recrystallized fraction, precipitates and mechanical properties of 6061 aluminum alloy containing 0.15% Fe (mass fraction) was investigated. The results show that: after homogenization the main phases of the 0 Mn alloy is β-Al9Fe2Si2 , and that of 0.1% Mn alloy is α-Al8(FeMnCr)2Si, meanwhile the blocky-shaped Al9 (MnFe) 3Si phase begins to appear and increases with increase of the Mn content; during aging treatment, Mn and Mg, Si form the AlMnSi and AlFeMnSi phases preferentially, which makes the main hardening precipitates reduce and weakens the strengthening effect. 0.2% Mn alloy is advisable, σb = 390 MPa, σ0.2 = 330 MPa, δ = 22.2%, which is increased by 90 MPa, 55 MPa and 10% respectively, comparing with AA6061 aluminum alloys’standard mechanical properties.
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