太原理工大学学报2018，Vol.49Issue(1)：9-14,6.DOI:10.16355/j.cnki.issn1007-9432tyut.2018.01.002
热处理对SiC增强YL117复合材料组织和性能影响
Effect of Heat Treatment on Microstructure and Properties of SiC Reinforced YL117 Composites
摘要
Abstract
The dispersed SiC Al powders were prepared by ball milling method and then hot pressed into the prefabricated block,and SiC reinforced YL117 composites were fabricated by semi-solid stirring casting.The microstructure and mechanical properties of YL117 matrix composites were investigated,where the volume fraction of SiC was 3.5 ％,4.5 ％ and 5.5 ％,separately.Subsequently,the 4.5％SiC/YL117 composites with the best mechanical properties were treated by T6 treatment,and optimal solid solution treatment and aging process were obtained.The results show that in case that the volume fraction of SiC was 4.5 ％ the composites presented an uniform distribution of SiC and small size of second phase,the maximum tension strength and elongation,272.5 MPa and 2.05％,increased by 23.1％ and 120.4％ with respect to those of matrix alloy,respectively.The agglomeration occured in the matrix when the volume fraction of SiC was 5.5 ％,which resulted in the decrease of mechanical properties.The optimal heat treat ment process was experimentally determined as 500 ℃ ×4 h solid solution followed by 170 ℃ × 10 h aging.The microhardness of 4.5％SiC/YL117 composites after heat treatment reached 164.3 HV,increased by 38.9％ with respect to that of matrix alloy,tensile strength and elongation,295.4 MPa and 2.12％,were improved by 33.4％ and 128.0％,respectively.关键词
YL117/重熔稀释/力学性能/热处理/碳化硅增强Key words
YL117/remelting and diluting/mechanical properties/heat treatment/SiC reinforcement分类
矿业与冶金引用本文复制引用
蔡来强,游志勇,张拓,司耀强,张金山..热处理对SiC增强YL117复合材料组织和性能影响[J].太原理工大学学报,2018,49(1):9-14,6.基金项目
国家自然科学基金资助项目(51474153) （51474153）
