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研究了不同Mn、Fe质量比和挤压压力对Al-Cu合金显微组织与力学性能的影响,并分析了其作用机理.结果表明,不同ω(Mn) /ω(Fe)的Al-Cu合金中主要存在4种富Fe第二相,即鱼骨状Alm Fe、块状a-Fe和Alm (FeMn)相以及针状β-Fe相;挤压压力为70 MPa时,合金中富Fe相相较于压力为0时更加细小和分散,且合金中针状β-Fe相在ω(Mn) /ω(Fe)为0.8时基本消失;而挤压压力为0,ω(Mn) /ω(Fe)为1.6时才基本消失;随着合金中ω(Mn) /ω(Fe)和挤压压力的增加,富Fe相圆整度提高,但是并不能显著改变合金中鱼骨状富Fe相的尺寸;挤压压力为0,Al-Cu合金在ω(Mn) /ω(Fe)为1.6时取得力学性能最佳值,而挤压压力为70 MPa时合金的最佳力学性能出现在ω(Mn)/ω(Fe)为1.2时.“,”The effects of varied Mn、Fe mass ratio and extrusion pressure on the microstructure and mechanical properties of Al-Cu alloy were investigated,and the mechanism was described.The results show that there exist mainly four kinds of Fe-enrichment phase in Al-Cu alloy with different Mn、Fe mass ratio,such as the fishbone AlmFe,massive α-Fe,blocky Alm (FeMn) and acicularβ-Fe phase.The Fe-enrichment phase is finer and more dispersed under the extrusion pressure of 70 MPa compared to that in the pressure of 0,and the acicular β-Fe phase in the alloy almost disappears when the Mn、Fe mass ratio is 0.8,while with extruding pressure of 0,acicular β-Fe phase almost disappears with Mn、Fe mass ratio of 1.6.With the increase of Mn、Fe mass ratio and extrusion pressure of Al-Cu alloy,the roundness of Fe-enrichment phase is improved,however,the change of size of fishbone like Fe-enrichment phase in the alloy is absent.When the extrusion pressure is 0,the optimum mechanical properties of Al-Cu alloy are obtained when the Mn、Fe mass ratio is 1.6,while the extrusion pressure is 70 MPa,the optimum mechanical properties of the alloy appear when the Mn、Fe mass ratio is 1.2.