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通过单因素和多因素试验、力学性能测试、金相显微组织分析,考察了不同w(Mn)/w(Fe)、w(Cr)/w(Fe)、w(Mn)/w(Cr)及Be对Al-13Si-4Cu-1Mg-0.8Fe合金组织中富铁相形貌,以及力学性能的影响规律。试验结果表明:当Fe为0.8%时,Al-13Si-4Cu-1Mg-0.8Fe合金中富铁相主要以长针状的β-Al5Fe Si形态出现;Mn、Cr单独变质过程中,随着w(Mn)/w(Fe)、w(Cr)/w(Fe)的增加,合金的室温强度均呈现先升后降趋势,而伸长率变化不大;当w(Mn)/w(Fe)比为1.1时,合金的室温强度最大可以达到364 MPa,当w(Cr)/w(Fe)为0.35时,合金的室温强度最大可以达到412 MPa;Mn、Cr复合变质时,当w(Mn)/w(Cr)为2.0时,合金综合力学性能可以达到σb=374 MPa、δ5=3.9%;Mn Be、Cr Be和Be的变质效果对合金力学性能影响的规律为Mn Be>Cr Be>Be>基体。
The effects of different w (Mn) / w (Fe), w (Cr) / w (Fe), w / Mn and Cr on the mechanical properties and the mechanical properties were investigated by single and multifactorial tests, mechanical properties tests and metallographic microstructures. Be on the iron-rich phase morphology and the mechanical properties of Al-13Si-4Cu-1Mg-0.8Fe alloy. The experimental results show that the iron-rich phase of Al-13Si-4Cu-1Mg-0.8Fe alloy mainly takes the form of long needle-shaped β-Al5Fe Si when Fe is 0.8%. In the process of single metamorphism of Mn and Cr, (W / Mn) / w (Fe) and w (Cr) / w (Fe), the room temperature strength of the alloys all increased first and then decreased, The maximum room temperature strength of alloy can reach 364 MPa when the ratio is 1.1, and the maximum room temperature strength can reach 412 MPa when w (Cr) / w (Fe) is 0.35.When Mn (Mn) ) / w (Cr) is 2.0, the mechanical properties of the alloy can reach σb = 374 MPa and δ5 = 3.9%. The law of Mn Be, Cr Be and Be on the mechanical properties of the alloy is Mn Be> Cr Be> Be> substrate.