高压条件下Al2O3/Al-10Si组织演变及力学性能  

Microstructure Evolution and Mechanical Properties of AlO/Al-10Si Composites Under High Pressure

作　　者：张艳衡 朱冬冬[2] 王刚[1] 董多[2] 王晓红 ZHANG Yanheng;ZHU Dongdong;WANG Gang;DONG Duo;WANG Xiaohong(School of Material Science and Engineering,Anhui Polytechnic University,Wuhu 241000;School of Mechanical Engineering,Quzhou University,Quzhou 324000)

机构地区：[1]安徽工程大学材料科学与工程学院,芜湖241000 [2]衢州学院机械学院,衢州324000

出　　处：《宇航材料工艺》2020年第4期66-71,共6页Aerospace Materials & Technology

基　　金：国家自然科学基金(51801112,51501100,51704001);浙江省自然科学基金(LY18E010003,LQ20E010003);安徽省领军人才计划(Z175050020001);安徽工程大学拔尖人才计划。

摘　　要：采用热压烧结与高压凝固分别制备了不同压力下Al2O3/Al-10Si复合材料,研究了高压对Al2O3/Al-10Si复合材料的组织演变规律及力学性能的影响。结果表明,高压凝固Al2O3/Al-10Si复合材料由α相,β相和Al2O3强化相组成,其中α相呈胞状,在α相晶界处存在少量粒径约为0.1μm的颗粒状β相;对于不同压力下制备的复合材料性能研究发现,凝固压力增加,α相中Si的固溶度增加,显微硬度及拉伸强度也随之提高,显微硬度由热压烧结时的55.3 HV,增加到了5 GPa时的128.1 HV,提高了133%,拉伸强度由热压烧结时的126 MPa,增加到了5 GPa时的702 MPa,这是由于高压导致α相中Si固溶度增加,形成了固溶强化。Al2O3/Al-10 Si composites solidified with different pressures were prepared by hot pressing and high pressure solidification. The effects of high pressure on the microstructure evolution and mechanical properties of Al2O3/Al-10 Si composites were investigated. The results show that the high pressure solidified Al2O3/Al-10 Si composite consists of α phase,β phase and Al2O3 strengthening phase,and α phase is cell-like. There is a small amount of fine granular β phase with a particle size of about 0. 1μm at α phase grain boundary. The solid solubility of Si in α phase and the microhardness increases with the increasing solidification pressure. The microhardness of the hot pressed sintered material is 55. 3 HV. When solidification pressure is 5 GPa,the microhardness is 128 HV and has increased by 133%,and the compressive strength has increased from 126 MPa to 702 MPa at 5 GPa,which is due to the high pressure causing an increase in the solid solubility of Si in α phase to form a solid solution strengthening.

关 键 词：高压凝固 组织形貌 凝固压力 显微硬度 

分 类 号：TG394[金属学及工艺—金属压力加工]