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采用拉伸性能测试、金相显微镜(OM)、扫描电镜(SEM)及能谱分析(EDS)等手段,研究了添加微量V对重力铸造Al-5.0Cu-0.4Mn-0.1Ti-0.1RE合金力学性能及微观组织的影响。结果表明,加入0.25%的V,合金的抗拉强度、屈服强度、伸长率均达到峰值,这是由于V在合金中的细晶强化作用;当V含量达到0.35%时,合金的力学性能急剧下降,原因在于过量的V在合金中积聚生成粗大的块状Al_(10)V相,在拉伸过程中Al_(10)V相发生严重断裂,使得合金的抗拉强度、屈服强度和伸长率下降。
Tensile properties of Al-5.0Cu-0.4Mn-0.1Ti-0.1RE alloy were investigated by tensile testing, optical microscopy (OM), scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS) Mechanical properties and microstructure effects. The results show that the tensile strength, yield strength and elongation of the alloy all reach the peak value when adding 0.25% V, which is due to the fine grain strengthening effect of V in the alloy. When the V content reaches 0.35%, the mechanical properties The reason is that excessive V accumulates in the alloy to form massive Al 10 V phase, and the Al 10 phase V is severely fractured during the tensile process, resulting in the tensile strength, yield strength and elongation of the alloy The rate of decline.