东北大学学报（自然科学版）

东北大学学报（自然科学版） ›› 2023, Vol. 44 ›› Issue (4): 495-501.DOI: 10.12068/j.issn.1005-3026.2023.04.005

• 材料与冶金 • 上一篇    下一篇

双阶段均匀化对铸轧Al-Zn-Mg-Cu合金Al3Zr析出的影响

王昭东1， 李新乐1， 李勇1,2， 卢兵1   

  1. (1. 东北大学 轧制技术及连轧自动化国家重点实验室， 辽宁 沈阳110819；2. 广西先进铝加工创新中心有限责任公司， 广西 南宁530007)
  • 发布日期:2023-04-27
  • 通讯作者: 王昭东
  • 作者简介:王昭东(1968-)，男，安徽怀宁人，东北大学教授，博士生导师.
  • 基金资助:
    国家自然科学基金资助项目(51790485); 山东省重点研发计划项目(2019JZZY010401); 南宁市科技重大专项项目(20201041， 20191002).

Two-Stage Homogenization of Al-Zn-Mg-Cu Alloy to Improve Al3Zr Precipitation Processed by Twin-Roll Casting

WANG Zhao-dong1， LI Xin-le1， LI Yong1,2， LU Bing1   

  1. 1. State Key Laboratory of Rolling and Automation， Northeastern University， Shenyang， 110819， China； 2. Guangxi Advanced Aluminum Processing Innovation Center Co.， Ltd.， Nanning 530007， China.
  • Published:2023-04-27
  • Contact: LI Yong
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摘要： 研究了均匀化制度对双辊铸轧Al-Zn-Mg-Cu合金Al3Zr相析出行为及再结晶的影响，以及Al3Zr析出和再结晶程度对合金力学性能和耐晶间腐蚀性能的影响.结果表明，相比于传统的单阶段均匀化，双阶段均匀化的第一阶段为Al3Zr的析出提供了更大的形核驱动力和更多的非均匀形核质点，促进了Al3Zr的析出.此外，不同的升温速率对Al3Zr的析出也有影响，缓慢的升温速率有利于细化Al3Zr尺寸，增加Al3Zr的数量密度和体积分数.固溶处理时，Al3Zr相f/r值的变化导致了不同的再结晶抗力，因此在T6处理后双阶段均匀化的试样再结晶组织比例降低，大角度晶界数量减少.Al3Zr相f/r值以及显微组织的变化对合金力学性能的影响较小，显著提高了合金的抗晶间腐蚀性能.

关键词: 双阶段均匀化；Al-Zn-Mg-Cu合金；Al3Zr相；晶间腐蚀；双辊铸轧

Abstract: This study focused on the effect of homogenization on precipitation behavior and recrystallization of Al-Zn-Mg-Cu alloy with twin roll casting (TRC). Furthermore， the influences of Al3Zr precipitation and recrystallization levels on mechanical properties and intergranular corrosion (IGC) resistance were evaluated. The results showed that compared to the single-stage homogenization， the first stage of two-stage homogenization provides higher driving force and greater number of heterogeneous nucleation sites， which enhances the precipitation of Al3Zr. In addition， different heating rates also affect the precipitation of Al3Zr. The slow heating rate is beneficial to refine the size of Al3Zr and increases the quantity density and volume fraction of Al3Zr particles. During the solution treatment， variations of f/r ratio of Al3Zr phase leads to different recrystallization resistance， so the proportion of recrystallization structure and the number of large angle grain boundaries of the samples homogenized after the T6 treatments decrease. These microstructures and the corresponding distributions of Al3Zr slightly affected the mechanical properties， while they significantly improved the intergranular corrosion resistance.

Key words: two-stage homogenization; Al-Zn-Mg-Cu alloy; Al3Zr precipitation; intergranular corrosion; twin-roll casting

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