金属热处理 ›› 2021, Vol. 46 ›› Issue (5): 75-80.DOI: 10.13251/j.issn.0254-6051.2021.05.012

• 工艺研究 • 上一篇    下一篇

固溶处理对喷射成形1420铝锂合金组织和性能的影响

徐桂芳1, 管云鹏1, 郭章坚1, 王嘉2   

  1. 1.江苏大学 材料科学与工程学院, 江苏 镇江 212013;
    2.江苏豪然喷射成形有限公司, 江苏 镇江 212009
  • 收稿日期:2020-10-22 出版日期:2021-05-25 发布日期:2021-07-21
  • 作者简介:徐桂芳(1966—),女,教授,博士,主要研究方向为材料制备与加工,E-mail:gfxu@ujs.edu.cn。
  • 基金资助:
    装备预研项目(共用技术)(41422060203);市重点研发计划(GY2019004)

Effect of solution treatment on microstructure and properties of spray formed 1420 Al-Li alloy

Xu Guifang1, Guan Yunpeng1, Guo Zhangjian1, Wang Jia2   

  1. 1. School of Materials Science and Engineering, Jiangsu University, Zhenjiang Jiangsu 212013, China;
    2. Jiangsu Haoran Spray Forming Alloy Co., Ltd., Zhenjiang Jiangsu 212009, China
  • Received:2020-10-22 Online:2021-05-25 Published:2021-07-21

摘要: 对喷射成形挤压态的1420铝锂合金进行不同温度、不同时间的固溶处理。采用光学显微镜(OM)、扫描电镜(SEM)、能谱仪(EDS)、X射线衍射仪(XRD)和电子万能试验机对合金的显微组织和力学性能进行分析。结果表明:挤压态合金中分布着大量Al3Li、AlLi粒子。经450 ℃×0.5 h固溶处理后可获得细小的组织和良好的综合力学性能;第二相颗粒基本溶入合金基体中,抗拉强度为377.47 MPa,伸长率为17.3%,晶粒平均尺寸为2.91 μm;合金的断裂方式为韧性断裂。随着固溶温度、时间的增加,裂纹起源于合金缺陷处,以穿晶的方式扩展。

关键词: 1420铝锂合金, 固溶处理, 喷射成形, 显微组织, 力学性能

Abstract: Extruded spray formed 1420 Al-Li alloy was solution treated at different temperatures for different time. The microstructure and mechanical properties of the alloy were analyzed by optical microscope (OM), scanning electron microscope (SEM), energy dispersive spectrometer (EDS), X-ray diffraction (XRD) and electronic universal testing machine. The results show that a large number of Al3Li and AlLi particles are distributed in the extruded alloy. After solid solution treatment at 450 ℃ for 0.5 h, the alloy can obtain fine microstructure and good comprehensive mechanical properties, with the average grain size being 2.91 μm, the second phase particles dissolved into the matrix, the tensile strength and the elongation being 377.47 MPa and 17.3% respectively, and the fracture mode of the alloy is ductile type. With the increase of solution treatment temperature and time, the cracks originate from the defects and propagate in transgranular mode.

Key words: 1420 Al-Li alloy, solution treatment, spray forming, microstructure, mechanical properties

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