晶粒分布对AZ80镁合金室温力学性能的影响  

Effects of Grain Distribution on Mechanical Properties of AZ80 Magnesium Alloy at Room Temperature

作　　者：郑军 骆晓东 肖毅生 Zheng Jun;Luo Xiaodong;Xiao Yisheng(Avic Changhe Aircraft Industry(Group)Co.,Ltd.,Jingdezhen 333001)

机构地区：[1]航空工业昌河飞机工业(集团)有限责任公司,景德镇333001

出　　处：《特种铸造及有色合金》2024年第2期235-239,共5页Special Casting & Nonferrous Alloys

摘　　要：采用高温等通道转角挤压(ECAP)方法制备了多类型AZ80变形镁合金,通过金相显微镜(OM)、扫描电镜(SEM)等分析了镁合金的微观组织特征,研究了晶粒分布特征对镁合金室温力学性能的影响,探究了双峰组织的强化机制。结果表明,A型双峰组织镁合金的平均晶粒尺寸约为80μm,其室温屈服强度与抗拉强度分别为226.1、454.3 MPa,伸长率为17.5%,均高于平均晶粒尺寸约为4μm的细晶镁合金的屈服强度(215.4 MPa)、抗拉强度(438.0 MPa)和伸长率(14.0%)。另外,A型双峰组织的强化效果优于B型双峰组织,细晶强化效果介于B型双峰组织与均匀细晶组织;B型双峰组织过度的晶粒细化会破坏双峰组织的强化作用。Multiple types of AZ80 deformed magnesium alloy were prepared by high temperature ECAP.The microstructure characteristics of magnesium alloy was analyzed by metallographic microscope(OM)and scanning electron microscope(SEM)to investigate the influence of grain distribution on mechanical properties of magnesium alloy at room temperature,and the strengthening mechanism of bimodal microstructure was explored.The results indicate that the yield strength,tensile strength and elongation of 17.5% of type A bimodal magnesium alloy are 226.1 MPa,454.3 MPa and 17.5%,respectively,with average grain size of 80μm,which are higher than those with 4μm(215.4 MPa,438.0 MPa,14.0%).The strengthening effect of type A bimodal structure is better than that of type B,and the strengthening effect of fine grains is between the two.The excessive grain refinement of type B bimodal structure can destroy the strengthening effect of bimodal structure.

关 键 词：镁合金 晶粒分布 双峰组织 强化机制 

分 类 号：TG146.22[一般工业技术—材料科学与工程]