文档介绍：第 20 卷第 8 期中国有色金属学报 2010 年 8 月
The Chinese Journal of Nonferrous Metals Aug. 2010
文章编号:1004-0609(2010)08-1520-07

Al-Si-Mg-Y 合金消失模铸造振动压力凝固的组织与性能

赵忠,樊自田,成平,蒋文明,董选普

(华中科技大学材料成形与模具技术国家重点实验室,武汉 430074)

摘要: 应用消失模铸造振动压力凝固成形技术制备了 Al-7Si--(ASMY)合金。通过 SEM、XRD、DSC
和 TEM 等测试方法对其铸态和 T6 组织进行分析,研究其对力学性能的影响。结果表明:在 ASMY 合金铸态组
织的晶界处生成有少量 Al3Y 短棒状颗粒相;在 T6 热处理过程中,稀土 Y 或 Al3Y 阻碍 Mg2Si 相的析出和扩散聚
集,使析出相 Mg2Si 呈弥散分布;Mg2Si 相与晶界稳定相 Al3Y 对合金同时起到钉扎强化作用;采用消失模铸造
振动压力凝固技术后,铝合金的孔隙率显著降低,从 %降低 %;ASMY 合金消失模铸造振动压力凝固试样
T6 态的抗拉强度达到 308 MPa,比 A356 普通消失模试样 T6 态的抗拉强度提高 29%。
关键词:Al-Si-Mg-Y 合金;消失模铸造;振动压力;组织;性能
中图分类号:TG292 文献标志码:A

Microstructures and properties of Al-Si-Mg-Y alloy with
vibration-pressure solidification in lost form casting

ZHAO Zhong, FAN Zi-tian, CHENG Ping, JIANG Wen-ming, TONG Xuan-pu

(State Key Laboratory of Material Processing and Die and Mould Technology,
Huazhong University of Science and Technology, Wuhan 430074, China)

Abstract: Al-7Si-- (ASMY) alloy was produced with vibration-pressure solidification in lost foam casting
(LFC). The microstructure and mechanical properties of the as-cast and T6 heat treatment ASMY alloys were investigated
by SEM, XRD, DSC and TEM. The results indicate that a small amount of short rod-like Al3Y particle generates at the
grain boundary of the as-cast