Microstructure,mechanical properties and wear resistance of SiC_(p)/AZ91 composite prepared by vacuum pressure infiltration  

真空压力浸渗制备SiC_(p)/AZ91复合材料的显微组织、力学性能和磨损行为

作　　者：Zhi-ping GUAN Ming-yu LI Kai-xin XIA Zhi-gang LI Dan GAO Po ZHAO Pin-kui MA Jia-wang SONG 管志平;李明宇;夏凯欣;李志刚;高丹;赵泼;马品奎;宋家旺(吉林大学,汽车仿真与控制国家重点实验室,长春130022;吉林大学材料科学与工程学院,长春130022)

机构地区：[1]State Key Laboratory of Automotive Simulation and Control,Jilin University,Changchun 130022,China [2]School of Materials Science and Engineering,Jilin University,Changchun 130022,China

出　　处：《Transactions of Nonferrous Metals Society of China》2022年第1期104-121,共18页中国有色金属学报（英文版）

基　　金：financial supports from the National Natural Science Foundation of China(Nos.U1810208,51575230);the Science and Technology Development Program of Jilin Province,China(No.20190302059GX)。

摘　　要：SiC_(p)/AZ91 composites were prepared by vacuum pressure infiltration.The microstructure,mechanical properties and wear resistance of composite were studied.Results indicated that SiC particles were uniformly distributed in the metal matrix and had a good interface bonding with the metal matrix.Mg_(17)Al_(12) preferably precipitated near the SiC particles,and high-density dislocations were induced by the mismatch of the coefficient of thermal expansion(CTE)between the SiC particle and the AZ91 matrix,thereby accelerating the aging precipitation of the matrix.Compared with AZ91 alloy,the addition of SiC particles improves the hardness and compressive strength of the composite,which is mainly due to the load transfer strengthening and grain refinement strengthening mechanisms.Furthermore,a stable support surface-protecting matrix formed during the wear process because of the excellent wear resistance of SiC.采用真空压力浸透法制备SiC_(p)/AZ91复合材料,研究其显微组织、力学性能和耐磨性。结果表明,SiC颗粒均匀分布于金属基体中,并与基体界面结合良好。Mg_(17)Al_(12)相在SiC颗粒附近优先析出,SiC与AZ91基体的热膨胀系数失配导致高密度位错的产生,加速基体的时效析出。与AZ91合金相比,SiC颗粒的加入提高了复合材料的硬度和抗压强度,这主要是由于载荷传递强化和晶粒细化强化机制。此外,由于SiC具有优异的耐磨性,在磨损过程中形成稳定的支撑面保护基体。

关 键 词：magnesium matrix composites SiC particle vacuum pressure infiltration aging behavior WEAR 

分 类 号：TB333[一般工业技术—材料科学与工程]