摘要
通过铁模和铜模铸造,配合粒状化处理制备了Al-8Ca合金,分析了合金显微组织、相组成和力学性能,研究了不同凝固速度及热处理对Al-8Ca铝合金组织性能的影响。结果表明,Al-8Ca合金在不同冷却速度下凝固,显微组织中少量初生α-Al呈树枝状,共晶组织呈层片状,由α-Al和A14Ca相组成。随着冷速提高,树枝状α-Al变小,晶粒细化,层片间距减小,高冷速下形成过饱和固溶体。扩散退火处理后共晶组织熔断,向颗粒状转变,有加粗趋势。
Al-8Ca alloy was prepared by iron mold and copper mold casting with granular heat treatment.The microstructure,phase composition and mechanical properties of the alloy were analyzed.The effect of different solidification rate and heat treatment on microstructure and properties of Al-8Ca aluminum alloy was studied.The results show that Al-8Ca alloy solidified at different cooling rates,and a small amount of primary a-Al is dendritic in microstructure and lamellar in eutectic microstructure,which is composed of α-Al and A14Ca phases.With the increase of cooling rate,dendritic α-Al become smaller,grains are refined,lamellar spacing decrease,and supersaturated solid solution is formed at high cooling rate.After diffused annealing,eutectic microstructure is melted and change to granule shape,and the grain becomes coarse.
作者
郭莹
赵玉华
曲婷婷
吴静
GUO Ying;ZHAO Yuhua;QU Tingting;WU Jing(School of Materials Science and Engineering,Shenyang Aerospace University,Shenyang 110000,China)
出处
《铸造技术》
CAS
2019年第12期1274-1277,共4页
Foundry Technology
基金
2018年沈阳航空航天大学大学生创新创业训练项目资助（201810143025）
关键词
Al-8Ca合金
冷却速度
热处理
粒状化处理
组织性能
Al-8Ca alloy
cooling rate
heat treatment
granular treatment
microstructure and properties
