Microstructural characteristics of thixoforged A356 alloy
Tensile properties of a thixoforged A356 alloy were measured and compared with those of rheoeast and gravity cast alloys with the same composition. In the thixoforging process, A356 rheocast alloy produced by stirring method was reheated to 600 ℃ or 610 ℃, held for 10 min, and then 50％ deformation was applied. Microstructure, tensile properties and fracture surfaces of produced specimens were then investigated. Results obtained show that tensile strength, yield strength and elongation-to-failure of thixoforged samples formed at lower temperature are higher than those of samples formed at higher temperature. By increasing temperature, in the case of thixoforged samples, tensile fracture path is changed from trans-primary alpha phase to inter-primary alpha phase. Differences observed in the tensile fracture path and improvement in the mechanical properties due to thixoforging process is attributed to microstructural changes as well as morphological aspects of silicon phase.
thixoforging rheocasting tensile properties hot working fracture surface
S. TAHAMTAN A. FADAVI BOOSTANI
Department of Materials Science and Engineering, Isfahan University of Technology, Isfahan, Iran
国际会议
北京
英文
781-787
2010-09-16（万方平台首次上网日期，不代表论文的发表时间）