【摘要】 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％。更多还原

【Abstract】 Adding Mn and Mg in Al-5Fe(mass fraction, %) alloy has obvious effect on the morphology of the primary Al3Fe phase which is thick needle plate-like before adding alloyed elements. The addition of 2.5% Mn and 0.1% Mg(mass fraction) changes the primary Al3Fe phase from thick needle plate-like to fine needle-like, particle-like and flower-like; the additon of 2.5% Mn and 1.5% Mg forms particle-like and fringe-like (bifurcated), the forming mechanism of which was analysed. The mechanical property is raised after the addition of Mn and Mg: the tensile strength of Al-5Fe alloy is 107 MPa, Al-5Fe-2.5Mn-0.1Mg alloy 139 MPa and Al-5Fe-2.5Mn-1.5Mg alloy 122 MPa. The properties are increased by 29.9% and 14% respectively compared with that of Al-5Fe alloy.更多还原