研究了Mn含量对含0.15％Fe的6061铝合金的均匀化组织、再结晶分数、时效析出相和力学性能的影响.结果表明:未添加Mn的合金均匀化后组织以β-Al9Fe2Si2相为主,Mn含量大于0.1％的合金均匀化后的组织以α-Al8(FeMnCr)2Si相为主;同时一种块状的Al9(MnFe)3Si结晶相随着Mn含量的增加开始出现,并随之增多;时效处理时,Mn优先与Mg,Si元素结合形成的AlMnSi和A1FeMnSi相,减少了主要时效析出相,使强化效果减弱;Mn的添加量为0.2％时σ0=390 MPa,σ0.2=330 MPa,δ=22.2％,比AA6061铝合金的标准力学性能分别提高90MPa,55MPa,延伸率提高10％.
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 isβ-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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