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在CO2+SF6气体保护条件下感应熔炼制备了不同Y含量的AZ61-x Y(x=0,0.5,1,1.5,2)镁合金,利用光学金相显微镜(OM)、扫描电镜(SEM)、X射线衍射分析(XRD)、能谱分析(EDS)和拉伸及蠕变力学性能测试手段研究了Y添加对AZ61合金显微组织和力学性能的影响。结果表明:合金中添加适量的稀土元素Y后,AZ61合金的显微组织得到明显的细化,合金中除了存在α-Mg和Mg17Al12相,还出现了块状析出相Al2Y。适量的Y显著提高了合金在室温和高温时的强度和塑性,同时合金在150℃/70MPa条件下的抗蠕变性能也有显著的提升。
AZ61-xY (x = 0,0.5,1,1.5,2) magnesium alloy with different Y content was prepared by induction melting under the CO2 + SF6 gas protection conditions. The microstructures of AZ61- , X-ray diffraction (XRD), energy dispersive spectroscopy (EDS) and tensile and creep mechanical properties were used to study the effect of Y addition on the microstructure and mechanical properties of AZ61 alloy. The results show that the microstructure of AZ61 alloy is obviously refined after the addition of proper amount of rare earth element Y in the alloy. In addition to α-Mg and Mg17Al12 phases, Al2Y also appears in the alloy. Appropriate amount of Y significantly improves the strength and ductility of the alloy at room temperature and high temperature, while the creep resistance of the alloy at 150 ℃ / 70MPa also significantly improved.