TiB2/Al-Si-Mg-Er复合材料的组织与性能  

Microstructure and properties of TiB2/Al-Si-Mg-Er composite

作　　者：杨子安 相志磊[1] 陈子勇[1] 任伟敏 马小昭 Yang Zi'an;Xiang Zhilei;Chen Ziyong;Ren Weimin;Ma Xiaozhao(College of Materials Science and Engineering,Beijing University of Technology,Beijing 100124,China)

机构地区：[1]北京工业大学材料科学与工程学院,北京100124

出　　处：《金属热处理》2020年第12期142-148,共7页Heat Treatment of Metals

摘　　要：采用重熔稀释法制备了Al-7Si-0.5Mg-0.1Er和0.5TiB2/Al-7Si-0.5Mg-0.1Er合金,研究了TiB2颗粒增强Al-Si-Mg-Er复合材料的组织性能。结果表明,复合材料铸态组织主要由α-Al基体、共晶Si相和TiB2颗粒组成。TiB2粒子的加入使Al-7Si-0.5Mg-0.1Er合金二次枝晶间距减小了7.1μm。抗拉强度达到217.53MPa,较Al-7Si-0.5Mg-0.1Er合金提升了12.1%。TiB2/Al-Si-Mg-Er复合材料的最优T6热处理工艺为530℃×12h固溶+160℃×7h时效,经该工艺处理后,TiB2/Al-Si-Mg-Er复合材料抗拉强度达到319.49MPa,相比热处理前提高了46.9%,相比Al-7Si-0.5Mg-0.1Er合金提高了5.9%;屈服强度达到266.75MPa,相比热处理前提高了106.4%,相比Al-7Si-0.5Mg-0.1Er合金提高了14.9%。复合材料抗拉强度的提升主要源于TiB2颗粒加入后产生的晶粒细化、变质和热处理强化。Al-7Si-0.5Mg-0.1 Er and 0.5 TiB2/Al-7Si-0.5Mg-0.1 Er alloys were prepared by remelting and dilution method,and the microstructure and properties of Ti B2 particle reinforced Al-Si-Mg-Er composites were studied.The results show that the as-cast microstructure of the composites is mainly composed ofα-Al matrix,eutectic Si phase and Ti B2 particles.The addition of Ti B2 particles reduces the secondary dendrite spacing of the Al-7 Si-0.5 Mg-0.1 Er alloy by 7.1μm.The tensile strength reaches 217.53 MPa,which is 12.1%higher than that of the Al-7 Si-0.5 Mg-0.1 Er alloy.The optimal T6 heat treatment process for the Ti B2/Al-Si-Mg-Er composite is 530℃×12 h solid solution+160℃×7 h aging.After this process,the tensile strength of the Ti B2/Al-Si-Mg-Er composite reaches 319.49 MPa,which is 46.9%higher than that before heat treatment,and 5.9%higher than that of the Al-7Si-0.5Mg-0.1 Er alloy.The yield strength reaches 266.75 MPa,which is increased by 106.4%compared with that before heat treatment and is 14.9%higher than that of the Al-7Si-0.5Mg-0.1 Er alloy.The improvement of the tensile strength of the composite materials mainly comes from the grain refinement,modification and heat treatment strengthening of Ti B2 particles.

关 键 词：Al-Si-Mg-Er合金 TIB2颗粒 复合材料 热处理 组织 力学性能 

分 类 号：TG142[一般工业技术—材料科学与工程]