论文部分内容阅读
采用示差扫描量热分析(DSC)、布氏硬度、光学显微镜等方法研究了固溶处理对挤压铸造高强韧铝铜合金组织与性能的影响规律。结果表明:随着固溶时间的增加,硬度逐渐升高,在固溶3~5 h后达到峰值。50 MPa挤压力下,合金未固溶处理的硬度为44.8 HRB,固溶5 h时效5 h后合金的硬度为71.7 HRB,比前者增加了60%。50 MPa挤压力下,T4固溶处理后合金显微组织中主要形成尺寸均匀且细小的等轴α(Al)晶粒,并出现较多数量的弥散相。
The effects of solution treatment on the microstructure and properties of high strength and toughness aluminum-copper alloy by squeeze casting were investigated by differential scanning calorimetry (DSC), Brinell hardness and optical microscopy. The results show that with the increase of solution time, the hardness gradually increases and reaches its peak after 3 ~ 5 h of solution treatment. The hardness of untreated alloy was 44.8 HRB at 50 MPa and the hardness of the alloy was 71.7 HRB after 5 h aging treatment, which was 60% higher than the former. Under the compressive stress of 50 MPa, the equiaxed α (Al) grains with uniform size and small size were formed mainly in the microstructure of the alloy after T4 solution treatment, and a larger number of dispersed phases appeared.