铸造2025，Vol.74Issue(6)：745-750,6.
静置时间对AlSi7Mg0.3合金变质效果及微观组织与力学性能的影响
Influence of Holding Time on Modification Effect,Microstructure and Mechanical Properties of AlSi7Mg0.3 Alloy
摘要
Abstract
The AlSi7Mg0.3 aluminium alloy was smelted using a centralized smelting furnace and subsequently transferred to a crucible furnace for modification treatment with an Al-Sr master alloy.The influence of holding time on the modification effect of Sr was investigated through metallographic structure observation and mechanical properties testing.The results indicate that when the holding time of the molten aluminium is 7 h,the grain boundaries of the α-Al matrix are well-defined,and the eutectic Si phase is uniformly distributed within the matrix,resulting in relatively high mechanical properties for the sample.After T6 heat treatment,the tensile strength,yield strength,and elongation of the sample were 306.2 MPa,236.9 MPa,and 10.2％,respectively.However,once the holding time exceeds 8 h,significant deterioration in modification occurs within the metallographic structure;specifically,grain boundaries become indistinct and noticeable pores appear in solidification structures.Consequently,there is a marked decline in mechanical properties of the sample.When subjected to an 11-hour holding time prior to T6 heat treatment,tensile strength decreases to 282.8 MPa while yield strength drops to 220.3 MPa;elongation also reduces to 7.0％.关键词
AlSi7Mg0.3铝合金/Sr变质/静置时间/微观组织/力学性能Key words
AlSi7Mg0.3 aluminum alloy/Sr modification/holding time/microstructure/mechanical properties分类
矿业与冶金引用本文复制引用
马小军,李连驰,刘海滨,苏为强,黄庆,吴孟武..静置时间对AlSi7Mg0.3合金变质效果及微观组织与力学性能的影响[J].铸造,2025,74(6):745-750,6.基金项目
湖北省技术创新计划项目(2024BAB072) （2024BAB072）
武汉理工大学技术转移荆门中心产业基金项目(WHUTJMZX-2024JJ-13). （WHUTJMZX-2024JJ-13）
