【摘要】 研究了热处理对不同Sr含量变质A356合金组织及力学性能的影响。结果表明:A356合金经0.04%Sr变质与T6处理后,合金中的共晶硅全部转变成近球形颗粒组织。合金的布氏硬度、抗拉强度和伸长率均达到最大值,分别为HBW100.1,310.61 MPa和13.16%,综合力学性能得到显著提高。合金的断裂方式由铸态下的韧脆混合断裂转变成韧性断裂。更多还原

【Abstract】 The effects of heat treatment on the microstructure and mechanical properties of A356 alloy modified by different Sr content were studied. The results show that eutectic silicon in A356 alloy is transformed into nearly spherical granular structure by 0.04% Sr modification and T6 heat treatment. The Brinell hardness, tensile strength and elongation of the alloy reach the maximum values, which are HBW 100.1, 310.61 MPa and 13.16%, respectively. The fracture mode of the alloy changes from ductile-brittle mixed fracture to ductile fracture, and its comprehensive mechanical properties are significantly improved.更多还原