T4与T6热处理对AM60-0.3Nd镁合金组织和力学性能的影响  

Effects of T4 and T6 heat treatment on microstructure and mechanical properties of AM60-0.3Nd magnesium alloy

作　　者：张金玲[1,2] 王国军[1] 刘璐[1] 王社斌[1,2] 许并社[1,2] 

机构地区：[1]太原理工大学材料科学与工程学院,山西太原030024 [2]太原理工大学教育部新材料界面与工程重点实验室,山西太原030024

出　　处：《材料热处理学报》2011年第5期116-120,共5页Transactions of Materials and Heat Treatment

基　　金：山西省留学基金(2008-39)

摘　　要：通过对AM60-0.3Nd镁合金进行T4及T6热处理,研究了不同热处理工艺对合金组织和力学性能的影响。结果表明,AM60-0.3Nd镁合金经T4热处理后,晶粒尺寸由铸态时的90μm下降至20μm左右,铸态时沿晶界分布的网状β-Mg17 Al12相完全消失,Al-Nd中间化合物由点状、块状凝聚成球状,抗拉强度得到显著提高,达到262 MPa;经T6热处理后,晶粒尺寸由铸态时的90μm下降至30μm左右,β-Mg17Al12相重新析出而Al-Nd中间化合物的形态又转变为块状,硬度得到显著提高,达到75 HV。Effects of heat treatment on microstructure and mechanical properties of AM60-0.3Nd magnesium alloy were investigated by means of optical microscopy,SEM,XRD and tensile test.The results indicate that grain size of the AM60-0.3Nd alloy decreases from 90 μm in as-cast condition to about 20 μm after T4 heat treatment and the net-like β-Mg17Al12 distributed along grain boundary disappears completely.The dot and block AL-Nd intermetallics change to spherical ones and tensile strength increases to 262 MPa for the as-cast AM60-0.3Nd alloy after T4 heat treatment.After T6 heat treatment,the grain size of AM60-0.3Nd is refined to about 30 μm and β-Mg17Al12 phases are re-precipitated,and the spherical Al-Nd intermetallics change to the block again and its hardness increases significantly,reaching to 75 HV.

关 键 词：AM60-0.3Nd镁合金 T4与T6热处理 显微组织 力学性能 

分 类 号：TG146.2[一般工业技术—材料科学与工程]