Mn和Mg添加到Al-5Fe(质量分数,%,下同)合金中,初生Al3Fe相的形貌发生明显变化.未加入合金元素时,该合金中的初生Al3Fe相长成粗大的针片状;加入2.5%Mn和0.1%Mg(质量分数,下同)后,粗大的初生富铁相消失,取而代之的是细小针状、粒状和花朵状;加入2.5%Mn和1.5%Mg,合金中的富铁相大部分转变为粒状和穗状(分叉状)两种.探讨了粒状和穗状的形成机理.对合金力学性能的测试表明,加入Mn和Mg后,合金的抗拉强度得到了不同程度的提高;Al-5Fe合金为107 MPa,Al-5Fe-2.5Mn-0.1Mg合金为139 MPa,Al-5Fe-2.5Mn-1.5Mg合金为122 MPa,增长幅度分别为29.9%和14%.
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