摘要
研究了喷射成形Al 8.5Fe 1.1V 1.9Si耐热铝合金组织结构的演变规律 ,测试了挤压态合金在室温及高温条件下的力学性能。与铸态组织特征相比较 ,喷射成形工艺有效地消除了铸态合金中粗大的富Fe析出相 ,获得了细小均匀的组织结构。利用OM ,SEM ,TEM ,XRD等材料分析测试手段 ,探索了材料中可能的组织演变过程及规律 ,结果表明 :喷射成形制备的Al Fe V Si耐热铝合金中 ,形成了大量的弥散分布的球状相 ,有效的保证了合金在室温及高温下的力学性能。室温下 ,合金的抗拉强度可以达到 44 5MPa ,屈服强度也达到了 3 98MPa ,延伸率为16%;在 3 15℃ ,合金的抗拉强度和屈服强度分别为 2 2 9和 2 0 9MPa。
The microstructure evolution and tensile strength of Al 8.5Fe 1.1V 1.9Si heat resistant alloy, which was prepared by spray forming process, were studied by materials analysis ways such as OM, SEM, TEM, XRD and tensile testing etc. In comparison with the alloys prepared by traditional cast process, Fe rich coarse phases were eliminated, and fine and homogenized structure was obtained in the spray formed alloy. The analysis results of the microstructure of the heat resistant alloy show that the dominate second phase in the alloy is α AlFeSi. At room temperature, the ultimate tensile strength is 445 MPa, and the yield strength is 398 MPa. At 315 ℃, the ultimate strength and yield strength is 229 and 209 MPa, respectively. The elongation rates at room temperature and 315 ℃ are 16% and 7%, respectively.
出处
《稀有金属》
EI
CAS
CSCD
北大核心
2004年第1期185-190,共6页
Chinese Journal of Rare Metals
基金
国家"973"资助项目 (G19990 64 90 0 5 4 )
