搅拌摩擦加工高强Al-Zn-Mg-Cu-Sc-Zr合金组织性能研究
Research on the Microstructure and Properties of High-strength Al-Zn-Mg-Cu-Sc-Zr Alloy Processed by Friction Stir Processing
刘莉 1董春林 1徐望辉 1刘锐哲1
作者信息
- 1. 广州航海学院船舶与海洋工程学院,广州 510700
- 折叠
摘要
本文通过Sc、Zr微合金化的方法制备了高强Al-Zn-Mg-Cu-Sc-Zr合金,并结合搅拌摩擦加工(FSP)改性获得了超细晶粒.采用金相显微镜(OM)、扫描电子显微镜(SEM)、电子背散射(EBSD)和显微硬度等测试方法,对比分析了FSP对Al-Zn-Mg-Cu-Sc-Zr微观组织和力学性能的影响.研究了Al-Zn-Mg-Cu-Sc-Zr合金在温度为300～450 ℃,应变速率为10-3～10-1s-1范围内的超塑性变形行为,结合微观组织观察,分析微合金化和搅拌摩擦加工对Al-Zn-Mg-Cu-Sc-Zr合金组织性能的影响.高稳定Al3(Sc,Zr)相的形成和超细晶粒组织使Al-Zn-Mg-Cu-Sc-Zr合金具有高的强度和良好塑性.本文研究结果可为超塑性高强Al-Zn-Mg-Cu系合金的开发奠定基础.
Abstract
In this paper,high strength Al-Zn-Mg-Cu-Sc-Zr alloy was prepared by Sc,Zr microalloying,and ultra-fine grains were obtained by friction stir processing(FSP).The effects of FSP on the microstructure and mechanical properties of Al-Zn-Mg-Cu-Sc-Zr were investigated by Optical Microscopy(OM),Scanning Electron Microscope(SEM),Electron Backscatter Diffraction(EBSD)and microhardness measurements.The superplastic deformation behavior of Al-Zn-Mg-Cu-Sc-Zr alloy in the range of 300～450 ℃ and 10 3～10 1 s-1 strain rate was studied.The effect of microalloying and friction stir processing on microstructure and properties of Al-Zn-Mg-Cu-Sc-Zr alloy was analyzed.Al-Zn-Mg-Cu-Sc-Zr alloy has high strength and good plasticity due to the formation of highly stable Al3(Sc,Zr)precipitates and ultrafine grains.The results obtained in this paper can lay a foundation for the development of high strength Al-Zn-Mg-Cu alloy with superplasticity.
关键词
铝合金/微合金化/搅拌摩擦加工/超塑性/微观组织性能Key words
aluminum alloy/microalloying/friction stir processing/superplasticity/microstructure and property引用本文复制引用
基金项目
国家自然科学基金青年基金(522***41)
广东省基础与应用基础研究基金(2021A****110062)
广州市基础与应用基础研究基金(2022****1373)
出版年
2024
NETL
NSTL
万方数据