无压烧结温度对15%SiC/2009Al复合材料微观组织与力学性能的影响  

Effect of pressureless sintering temperature on microstructure and mechanical properties of 15%SiC/2009Al composite

作　　者：边鹏博 朱士泽 张峻凡 肖伯律[2] 马宗义[2] BIAN Pengbo;ZHU Shize;ZHANG Junfan;XIAO Bolyu;MA Zongyi(School of Materials Science and Engineering,Shenyang Ligong University,Shenyang 110158,China;Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,China)

机构地区：[1]沈阳理工大学材料科学与工程学院,沈阳110158 [2]中国科学院金属研究所,沈阳110016

出　　处：《材料工程》2024年第5期76-82,共7页Journal of Materials Engineering

基　　金：国家重点研发计划(2022YFB3707400)。

摘　　要：针对传统粉末冶金工艺制备成本高、制备效率低等问题,采用冷等静压结合无压烧结及热挤压工艺制备15%(体积分数,下同)SiC/2009Al复合材料。研究不同烧结温度(600,620,640℃)对15%SiC/2009Al复合材料微观组织及力学性能的影响。结果表明:在600℃下烧结,SiC与基体间的结合差,微观下可观察到较多的大尺寸孔隙,材料的致密度低,力学性能差;在640℃高温下烧结,坯锭产生大量液相,并溢出到坯锭表面,造成心部合金元素下降,此外,640℃会引发强烈的界面反应,生成较多大尺寸脆性相,成为材料断裂过程中的裂纹源,导致材料性能下降;620℃为最佳烧结温度,产生较多的液相能填充坯锭中的部分孔隙,进而提高材料致密度以及界面结合强度,复合材料的强度和塑性均取得最佳值,抗拉强度与屈服强度分别达到505,345 MPa,伸长率达到7.2%。In view of the problems of high preparation cost and low preparation efficiency of traditional powder metallurgy process,15%(volume fraction,the same below)SiC/2009Al composite was prepared by cold isostatic pressing combined with pressureless sintering and hot extrusion process. The effect of different sintering temperatures(600,620,640 ℃) on microstructure and mechanical properties of 15%SiC/2009Al composite was studied. The results show that sintering at 600 ℃,the bonding between SiC and the matrix is poor,more large-size pores can be observed under the microscopic level,the density of the material is low,and the mechanical properties are poor. Sintering at a high temperature of 640 ℃,the billet produces a large amount of liquid phase,and overflows onto the surface of the billet,which causes the core alloying elements to decrease. In addition,sintering at 640 ℃ will trigger a strong interface reaction,generate more large-size brittle phase,become the source of cracks in the material fracture process,resulting in a decrease in material properties;620 ℃ is the best sintering temperature,and more liquid phase can fill part of the pores in the billet,thereby improving the density and interfacial bonding strength of the material,and the strength and plasticity of the composite material have obtained the best values,the tensile strength and yield strength reach 505 MPa and 345 MPa,respectively,and the elongation reaches 7. 2%.

关 键 词：SIC颗粒 铝基复合材料 冷等静压 烧结温度 力学性能 

分 类 号：TB331[一般工业技术—材料科学与工程]