纳米SiC颗粒对Mg9Al-1Si合金组织及力学性能的影响  

Effects of SiC Nanoparticles on Microstructure and Mechanical Properties of Mg9Al-1Si Magnesium Alloy

作　　者：郭玉玲[1,2] 王万华[2] 李明[2] 王志文[2] 王红霞[2] 

机构地区：[1]晋中职业技术学院机电工程系,山西榆次030600 [2]太原理工大学材料科学与工程学院,山西太原030024

出　　处：《铸造设备与工艺》2015年第4期32-34,58,共4页Foundry Equipment & Technology

基　　金：国家自然科学基金(51301118);山西省国际合作项目(2014081002);山西省高等学校科技创新项目(2013108)

摘　　要：研究了纳米Si C颗粒对Mg9Al-1%Si(以下记作Mg9Al-1Si)合金显微组织和力学性能的影响。研究结果表明:Mg9Al-1Si合金组织由α-Mg基体、网状β-Mg17Al12相及粗大汉字状或细长鱼骨状两种形态的Mg2Si相组成。加入质量分数为1%的纳米Si C颗粒,Mg9Al-1Si合金的α-Mg基体晶粒明显细化;β-Mg17Al12相变细变小,网状分布改善不大;粗大汉字状Mg2Si相消失,鱼骨状的Mg2Si相变得更加细小。合金的力学性能得到显著提高,屈服强度提高了13.5%;抗拉强度提高了54%;伸长率由0.48%提高到1.56%,提高了225%.Effects of SiC nanoparticles on microstructure and mechanical properties of Mg9Al-lwt.%Si （the following as Mg9A1- lSi） alloy were investigated in this paper.The experimental results show that microstructure of Mg9A1-1Si alloy is formed from α- Mg matrix,reticulate 13-MglTAl12 phase and the morphology of corase Chinese characters or herringbone Mg2Si phase.Due to the addition of lwt.%SiC nanoparticles,the grains of α-Mg are fined obviously.The phase of β-Mg1TAl12 is changed to fine and smaller, but the morphology of net is nearly not change.In addition,coarse Chinese characters Mg2Si phase is disappeared and herringbone Mg2Si phase is changed to more finer.The mechanical properties of alloys are improved significantly.For example,the ultimate tensile strength and yield strength respectively improved 54% and 13.5%.Elongation to fracture of alloys increased from 0.48% to 1.56%, increased by 225%.

关 键 词：纳米SIC颗粒 Mg9Al-1Si合金 显微组织 力学性能 

分 类 号：TG146.22[一般工业技术—材料科学与工程]