宇航材料工艺2024，Vol.54Issue(3)：55-62,8.DOI:10.12044/j.issn.1007-2330.2024.03.007
热处理工艺对复合熔体处理A356合金组织和性能的影响
Effect of Heat Treatment Processes on the Structural and Mechanical Properties of A356 Alloy With Complex Melt Treatment
摘要
Abstract
This paper demonstrated that the strength and toughness of Al alloy could be improved when ultrasonic melt treatment,Sr/Ce complex modification and heat treatment worked together.The effect of solid solution treatment on the microstructure and properties of A356 alloy was also studied by metallographic microscope(OM),scanning electron microscope(SEM),tensile machine and hardness instrument.The research results showed that melt treatment contributed to the improvement of the a-Al dendrites,and eutectic silicon phases,and the tensile strength of as-cast alloy reached 215MPa with elongation of 9.5％.After T6 heat treatment,the morphology of eutectic silicon changed from fibrous to spherical particles distributed independently,and mechanical properties were significantly also improved,except for elongation.As the solution time increased,the equivalent diameter of eutectic silicon decreased first and then increased,while the aspect ratio gradually decreased.Meanwhile,the tensile properties and microhardness of the alloys showed a trend of first increasing and then decreasing.When solution time was 4h,the optimized comprehensive mechanical properties of the alloy were obtained and its tensile strength,yield strength,elongation and microhardness reached 300MPa,240MPa,8.0％and 11 OHV,respectively.关键词
A356/超声处理/共晶硅/Sr/Ce复合变质Key words
A356/Ultrasonic treatment/Eutectic silicon/Sr/Ce composite modification分类
金属材料引用本文复制引用
王波,李青,刘让贤,孙甲尧,陈胜迁..热处理工艺对复合熔体处理A356合金组织和性能的影响[J].宇航材料工艺,2024,54(3):55-62,8.基金项目
湖南省教育厅科学研究优秀青年项目(23B1102) （23B1102）
湖南省自然科学基金项目(2020JJ7074) （2020JJ7074）
