摘要
采用热挤压法制备了双尺寸Al_2O_3颗粒增强AZ31镁基复合材料,利用光学显微镜(OM)、扫描电镜(SEM)、维氏硬度仪和电子万能拉伸试验机等研究了Al_2O_3/AZ31镁基复合材料的组织和力学性能。结果表明:经过热挤压后,双尺寸Al_2O_3颗粒均匀地分布在AZ31基体中,通过纳米颗粒对基体位错运动的钉扎作用和微米颗粒对晶粒长大的抑制作用,使复合材料的晶粒被显著细化。相比于单一尺寸,当添加双尺寸Al_2O_3颗粒时,复合材料的力学性能达到最大值,其硬度、抗拉强度和伸长率分别为85 HV、295 MPa和6.8%。
Double-sizes Al2O3 particles reinforced AZ31 magnesium matrix composites were prepared by hot extrusion method,and the microstructure and mechanical properties of the Al2O3/AZ31 magnesium matrix composites were studied by means of optical microscope(OM),scanning electron microscopy(SEM),Vickers hardness tester and electronic universal tensile tester.The results show that the double sizes Al2O3 particles are uniformly distributed in the AZ31 magnesium matrix after hot extrusion,and the grain size of the composites is significantly refined due to the pinning effect of nanoparticles on the dislocation movement of the matrix and the inhibition of microparticles on grain growth.Compared with the composites with the single size particles added,the mechanical properties of the composites reach the maximum when the double sizes Al2O3 particles are added,and its hardness,tensile strength and elongation are 85 HV,295 MPa and 6.8%,respectively.
作者
施倩
胡茂良
王飞
王旭忠
SHI Qian;HU Mao-liang;WANG Fei;WANG Xu-zhong(School of Materials Science and Engineering,Harbin University of Science and Technology,Harbin 150040,China)
出处
《材料热处理学报》
EI
CAS
CSCD
北大核心
2019年第5期32-36,共5页
Transactions of Materials and Heat Treatment
基金
国家自然科学基金项目(51404082)
2018年哈尔滨理工大学大学生创新创业训练计划(201810214187)
关键词
热挤压法
AZ31镁基复合材料
力学性能
显微组织
hot extrusion
AZ31 magnesium matrix composites
mechanical property
microstructure
