摘要
在室温下对电解铝液直接合金化生产铸态6063铝合金实施了道次等效应变约为0.5和0.9的等通道转角变形(Equal-channel angular pressing-ECAP),对其夹杂物的分布、碎化和合金的硬度进行了考察。结果表明,ECAP加工将未充分电解的尺寸极为细小(纳米尺度)、分布集中的团絮状Al2O3夹杂物分散开,将粗大(长(5～15)μm、宽(1～2)μm)几乎呈连续分布的AlFeSi夹杂物折断碎化(长1-3μm)并分散开,明显提高了合金的致密性、抗蚀性,并引入了大量位错于铝合金中,提高硬度的幅度达到60%。试验结果说明了ECAP作为一种提高电解铝液直接合金化生产的铸态铝合金组织的工艺方法的可行性。
Effect of equal channel angular pressing on microstructure of 6063 Al fabricated by in-situ alloying in electrolytic Al liquid was investigated.The equal-channel angular pressing(ECAP) was performed at room temperature,with an imposed equivalent strain of ～0.5 or 0.9.The results show that the ECAP processing can effectively distribute the un-electrolytic,nano-scale and aggregated Al2O3 inclusions presented on the grain surface,and can refined AlFeSi inclusions of the alloy considerably,with the size variation from(5～15) μm length/(1～2) μm width to(1～3) μm length/(1～2) μm width.In addition to the refinement,the ECAP processing also improved significantly the distribution of the AlFeSi inclusions,alloy density and corrosion-resistance,and introduced high density of dislocations leading to a ～60% increase of hardness.The present results demonstrate the possibility of ECAP as effective tools to improve microstructure of aluminum alloys fabricated by in-situ alloying in electrolytic Al liquid.
出处
《机械设计与制造》
北大核心
2010年第12期114-115,共2页
Machinery Design & Manufacture
基金
江苏大学优秀学术青年骨干培养对象基金(1211110001)
江苏省工业科技支撑项目(BE2008118)
教育部留学回国人员科研启动基金(2006-331)
