超细SiC颗粒对球磨制备纳米晶AZ91镁合金组织及性能的影响  

Effect of ultrafine SiC particles on microstructure and property of milled nanocrystalline AZ91 magnesium alloys

作　　者：张素卿 苏倩 于欢[1,2,4] 夏金环 马百常[1,2] 庄海华 周吉学 ZHANG Su-qing;SU Qian;YU Huan;XIA Jin-huan;MA Bai-chang;ZHUANG Hai-hua;ZHOU Ji-xue(Advanced Materials Institute,Shandong Academy of Sciences,Qilu University of Technology(Shandong Academy of Sciences),Jinan 250014,China;Key Laboratory for High Strength Lightweight Metallic Materials of Shandong Province,Qilu University of Technology(Shandong Academy of Sciences),Jinan 250014,China;School of Materials Science and Engineering,Shandong Jianzhu University,Jinan 250101,China;School of Materials Science and Engineering,Harbin Institute of Technology,Harbin 150001,China)

机构地区：[1]齐鲁工业大学(山东省科学院)山东省科学院新材料研究所,济南250014 [2]齐鲁工业大学(山东省科学院)山东省轻质高强金属材料省级重点实验室,济南250014 [3]山东建筑大学材料科学与工程学院,济南250101 [4]哈尔滨工业大学材料科学与工程学院,哈尔滨150001

出　　处：《粉末冶金技术》2021年第6期512-519,共8页Powder Metallurgy Technology

基　　金：国家自然科学基金资助项目(51804190);山东省自然科学基金资助项目(ZR2017LEM001)。

摘　　要：通过机械球磨制备了SiC颗粒(SiC_(p))增强镁基复合材料粉末(AZ91‒xSiC_(p),x=5%、10%、15%,体积分数),实现了镁基体纳米化及亚微米级SiC_(p)在镁基体中的均匀弥散分布,研究了SiC_(p)对球磨后粉末微观组织的影响规律。结果表明,SiC_(p)第二相的引入能够促进机械球磨过程中镁基体晶粒的细化,晶粒细化程度随SiC_(p)体积分数的增加有所加强,同时SiC_(p)含量的提高对Al元素在镁基体中的固溶及其自身颗粒的细化起到抑制作用。球磨后AZ91‒xSiC_(p)(x=5%、10%、15%)复合粉末的硬度分别为HV 166、HV175和HV 185,强化机制为细晶强化、弥散强化、固溶强化和承载强化,计算得到AZ91‒5%SiC_(p)复合粉末不同强化机制所引起的强化效果占比分别为86.9%、7.4%、1.8%和3.8%。The SiC particle(SiC_(p))reinforced magnesium matrix composite powders(AZ91‒xSiC_(p),x=5%,10%,15%,volume fraction)were synthesized by mechanical milling.After the mechanical milling,the grain size of the magnesium matrix was refined to nanoscale,and the ultrafine SiC particles were dispersed into the magnesium matrix uniformly.The effect of SiC_(p)on the microstructure of the milled nanocrystalline AZ91 magnesium alloys was analyzed.In the results,SiC_(p)could accelerate the refining of magnesium matrix.Meanwhile,both the dissolving of Al element into the magnesium matrix and the refining of SiC_(p)are inhibited due to the increasing of SiC_(p).The hardness of AZ91‒xSiC_(p)composites(x=5%,10%,15%)is HV 166,HV 175,and HV 185,respectively.The contribution ratio of grain boundary strengthening,Orowan strengthening,solid solution strengthening,and load-bearing strengthening to the milled AZ91‒xSiC_(p)composites is about 86.9%,7.4%,1.8%and 3.8%,respectively.

关 键 词：粉末冶金 纳米晶 镁基复合材料 超细SiC颗粒 颗粒增强 

分 类 号：TG146.2[一般工业技术—材料科学与工程]