摘要
对采用近液相线半连续铸造技术制备的AlSi7MgBe合金坯料进行半固态挤压成形,通过组织与性能的分析,研究了AlSi7MgBe合金的半固态挤压成形性.结果表明:用近液相线半连续铸造技术制备的AlSi7MgBe合金坯料具有均匀、细小的蔷薇状组织,在575℃对其二次加热可获得稳定的、适合于半固态触变成形的球化组织,进行半固态挤压成形可获得表面光洁,组织细小、分布均匀的成形件,在540℃固溶5 h然后175℃时效10 h处理,其抗拉强度为325 MPa,伸长率为14.6%,表明具有良好的半固态挤压成形性.
The semi-solid thixo-extruding feasibility of AlSiTMgBe alloy cast by near-liquidus semi-continuous casting （NLSC） process was studied by analyzing the microstructures and properties of extruded bars. The results shown that the microstructure of AlSi/MgBe alloy billets cast by NLSC consists mainly of the homogeneous, fine rosette-shaped grains. The microstructures of the billets, reheated and held at 575℃, are stable and near-spherical grains which are suitable for semi-solid thixoforming. The semi-solid thixoextruded bars of the AlSi7MgBe alloy billet are facial-smoothed, microstructure-fined and homogeneous. Treated by the solution at 540℃ for 5 hours and aging at 115℃ for 10 hours, the tensile strength of the semi-solid extruded bars is above 325 MPa and the elongation rate is above 14.5%.
出处
《材料研究学报》
EI
CAS
CSCD
北大核心
2009年第2期127-132,共6页
Chinese Journal of Materials Research
基金
国家自然科学基金50874049资助项目.~~
