铸造技术2026，Vol.47Issue(8)：870-878,9.DOI:10.16410/j.issn1000-8365.2026.5233
熔体冷速对高铁含量A356铝合金中富铁相尺寸及类型的影响
Effect of the Molten Metal Cooling Rate on the Size and Type of Iron-rich Phases in High Iron Containing A356 Al Alloys
摘要
Abstract
The primary Al production industry poses significant environmental and energy challenges,making the recycling of A356 Al alloy scrap highly attractive from both ecological and economic perspectives.A critical issue in recycling is the inevitable accumulation of Fe,which leads to the formation of coarse,brittle iron-rich intermetallics at lower solidification cooling rates,severely degrading the mechanical properties.On this basis,the role of increased cooling rates in modifying the morphology and composition of these iron-rich phases was investigated.Using a copper mold technique to achieve a range of cooling rates(15～108 K/s),their impact on the microstructure of an A356 Al alloy containing 0.36 wt.％Fe was systematically examined.The results demonstrate that higher cooling rates significantly refine the iron-rich phases and promote a more uniform distribution.Phase analysis further revealed that at elevated cooling rates(72～108 K/s),the precipitation of the detrimental[3-Fe phase is suppressed,favouring the formation of the less harmful π-Fe phase.关键词
高铁含量A356铝合金/富铁相/熔体冷速/微观组织Key words
high-Fe-containing A356 Al alloy/iron-rich phases/cooling rate/microstructure分类
矿业与冶金引用本文复制引用
牛云霞,张丽芝,万杰,刘海峰,陈豫增..熔体冷速对高铁含量A356铝合金中富铁相尺寸及类型的影响[J].铸造技术,2026,47(8):870-878,9.基金项目
国家重点研发计划(2022YFB3707103) （2022YFB3707103）
国家自然科学基金(52301197,52071262) （52301197,52071262）
凝固技术全国重点实验室自主研究课题(2024-ZD-06,2024-TS-06) （2024-ZD-06,2024-TS-06）
中央高校基本科研业务费专项资金(D5000240144) （D5000240144）
