细晶Al-7Si-0.35Mg-0.15Fe合金中富Fe相的调控
Regulation of Fe-rich Phases in Fine-grained Al-7Si-0.35Mg-0.15Fe Alloys
王旭 1任晓明 1侯星驰 2徐海龙 2贾志洁 3钱钊 1刘相法1
作者信息
- 1. 山东大学材料液固结构演变与加工教育部重点实验室,济南 250061
- 2. 山东力信铝业科技有限公司,滨州 256606
- 3. 山东省高端铝共同体管理运营有限公司,滨州 256606
- 折叠
摘要
通过加入0.5％的Al-TCB获得细晶Al-7Si-0.35Mg-0.15Fe合金,分别引入Mn、Cr来调控富Fe相,对比分析两种元素对富Fe相的调控效果及内在原因.结果表明,Mn、Cr均通过替换β-AlFeSi相中的Fe来变质富Fe相,可分别将针片状富Fe相变质为鱼骨状α-Al(Fe,Mn)Si相和块状α-Al(Fe,Cr)Si相,后者在合金中尺寸更细小,分布更均匀.当合金中添加0.1％的Mn(质量分数,下同)时,其抗拉强度、屈服强度及伸长率分别可达(327±9)MPa、(255±7)MPa和10.0％±0.8％,均比添加0.2％的Mn时要高;当合金中添加0.1％的Cr时,其抗拉强度、屈服强度及伸长率则分别可达(335±9)MPa、(270±6)MPa和11.4％±0.7％,亦高于添加0.2％的Cr时.在相同含量时,Cr对该合金具有比Mn更好的强塑化效果.该研究工作对于细晶A356铝合金(Fe≥0.15％)的绿色可再生利用具有重要意义.
Abstract
0.5％Al-TCB was added to obtain fine-grained Al-7Si-0.35Mg-0.15Fe alloy,and Mn and Cr were intro-duced to modulate Fe-rich phase.The modulation effects and intrinsic reasons were comparatively analyzed.The results reveal that both Mn and Cr modify the Fe-rich phase by replacing Fe in the β-AlFeSi phase,leading to the transformation of flaky Fe-rich phase to fishbone α-Al(Fe,Mn)Si phase and massive α-Al(Fe,Cr)Si phase,and the latter is finer and more uniformly distributed in the alloy.The tensile strength,yield strength and elongation of the alloy with 0.1％Mn(mass fraction)addition can reach up to(327±9)MPa、(255±7)MPa and 10.0％±0.8％,respec-tively,which are higher than that of ones with 0.2％Mn.When 0.1％Cr is introduced,the tensile strength,yield strength and elongation reach(335±9)MPa、(270±6)MPa and 11.4％±0.7％,respectively,which are also higher than that of ones with 0.2％Cr addition,indicating that Cr exhibits a stronger plasticizing effect on the alloy than Mn under identical contents.The work is of great significance for the green and renewable utilization of fine-grained A356 aluminum alloy(Fe≥0.15％).
关键词
细晶A356合金/Al-TCB晶种合金/富Fe相/再生铝合金Key words
Fine-grained A356 Alloy/Al-TCB Seed Alloy/Fe-rich Phase/Recycled Aluminum Alloy引用本文复制引用
出版年
2024
NETL
NSTL
万方数据