B对ZM5镁合金凝固组织和硬度的影响  

Effects of B on Microstructure and Mechanical Properties of the ZM5 Magnesium Alloy

作　　者：刘俊英[1] 刘栩瑞 Liu Junying;Liu Xurui(College of Mechanical and Electrical Engineering,Heyuan Polytechnic;School of Aeronautical Manufacture Engineering,Nanchang Hangkong University)

机构地区：[1]河源职业技术学院机电工程学院 [2]南昌航空大学航空制造工程学院

出　　处：《特种铸造及有色合金》2019年第7期805-807,共3页Special Casting & Nonferrous Alloys

基　　金：国家自然科学基金资助项目(51401102)

摘　　要：向ZM5镁合金中添加B元素,主要考察了B对合金凝固组织和硬度的影响。结果表明,B对ZM5镁合金具有良好的细化作用。随着B含量的增加,合金的晶粒尺寸逐渐减小。当B含量为0.03%时,ZM5镁合金的平均晶粒尺寸仅为76μm,相比未细化时降低了72.2%。B与Al形成AlB2化合物,其能够作为异质形核核心细化ZM5镁合金晶粒。随着B含量的增加,ZM5镁合金的硬度逐渐增加,当B含量为0.03%时,合金的硬度相比未细化时提高了23.2%。The effects of B addition on microstructure and properties of the ZM5 magnesium alloy were investigated.The results show that the B element presents the satisfied grain refinement effects.With increasing in B addition,grain size in the alloy is decreased gradually.With 0.03%B addition,the average grain size of ZM5 magnesium alloy is only 76μm,which is decreased by 72.2%compared with that of the unrefined ones,which is attributed to the generation of AlB2 compound with Al and B to act as heterogeneous nuclei to refine grain size in the alloy.With increasing in B additions,the hardness of ZM5 magnesium alloy is further increased.With 0.03%B addition,the hardness of ZM5 magnesium alloy is increased by 23.2%compared with that of the unrefined ones.

关 键 词：B ZM5镁合金 组织 硬度 

分 类 号：TG146.22[一般工业技术—材料科学与工程]