非平衡凝固Al-4.73Mg-0.71Sc-0.33Zr合金的组织及时效析出行为
Microstructure and aging precipitation behavior of non-equilibrium solidified Al-4.73Mg-0.71Sc-0.33Zr alloy
王杰 1杨伟 1应国民 1徐勇1
作者信息
- 1. 南昌航空大学轻合金加工科学与技术国防重点学科实验室,江西 南昌 330063
- 折叠
摘要
采用真空感应熔炼、铜模喷铸和时效处理相结合的方法,研究了不同冷速条件下Al-4.73Mg-0.71Sc-0.33Zr合金的凝固组织演化规律及其析出相的析出行为.结果表明:铸态合金组织由粗大的α-Al基体和Al3(Sc,Zr)微米颗粒组成;经铜模喷铸后,非平衡凝固(快冷)合金的平均晶粒尺寸由铸态的250 μm显著下降至7.5 μm,同时Al3(Sc,Zr)颗粒相的生长受到抑制;快冷合金经 300℃时效 45 min后,析出大量纳米Al3(Sc,Zr)相,合金显微硬度由 79.86 HV0.2 提高至 121.95 HV0.2,相比原始快冷合金提高 52.70%.
Abstract
The solidification microstructure evolution and precipitation behavior of Al-4.73Mg-0.71Sc-0.33Zr alloy under different cooling rates were studied using a combination of vacuum induction melting,copper mold spraying and aging treatment.The results show that the microstructure of the as cast alloy is composed of coarse α-Al matrix and Al3(Sc,Zr)micron-scale particles.After being sprayed into a copper mold,the average grain size of the non-equilibrium solidified(rapidly cooled)alloy decreases from 250 μm for as cast alloy to 7.5 μm,and the growth of Al3(Sc,Zr)particle phase is inhibited.After aging at 300℃for 45 min,a large amount of nano-scale Al3(Sc,Zr)phase is precipitated in the rapidly cooled alloy,and the micro hardness of the alloy increases from 79.86 HV0.2 to 121.95 HV0.2 which is 52.70%higher than the original rapidly cooled alloy.
关键词
Al-4.73Mg-0.71Sc-0.33Zr合金/非平衡凝固/时效析出/显微硬度Key words
Al-4.73Mg-0.71Sc-0.33Zr alloy/non-equilibrium solidification/aging precipitation/microhardness引用本文复制引用
基金项目
国家自然科学基金(52061032)
国家自然科学基金(52261014)
江西省教育厅项目(DA202203113)
出版年
2024
NETL
NSTL
万方数据