研究了微量Mn对Al-Mg-Si合金的微观组织与拉伸性能的影响.结果表明:微量Mn在Al-Mg-Si合金中主要以粒状α-Al15(FeMn)3Si2弥散相的形式存在,尺寸为12～210 nm,均匀、弥散分布在基体中,有效地钉扎位错和亚晶界,抑制合金热挤压变形过程中的再结晶;均匀化处理过程中微量Mn可促进长针状β-Al9FeSi相向粒状α-Al15(FeMn)3Si2相转变,这种含Mn的α相弥散颗粒可作为合金时效强化相β'(Mg2Si)的非均匀成核位置,促进β'相的析出,从而强化合金,使合金获得较好的强塑性配合.
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