金属热处理 ›› 2022, Vol. 47 ›› Issue (8): 182-187.DOI: 10.13251/j.issn.0254-6051.2022.08.031

• 工艺研究 • 上一篇    下一篇

热处理温度对Al-Gd合金凝固组织和硬度的影响

石向东1,2,3, 李德贵1,2, 曹阿林1,2, 古斌1,2, 梁柳青1,2   

  1. 1.百色学院 材料科学与工程学院, 广西 百色 533000;
    2.广西壮族自治区铝基新材料工程研究中心, 广西 百色 533000;
    3.中国热处理行业协会, 北京 100101
  • 收稿日期:2022-03-20 修回日期:2022-06-21 出版日期:2022-08-25 发布日期:2022-09-19
  • 通讯作者: 李德贵,副教授,博士,E-mail:lidegui354@163.com
  • 作者简介:石向东(1972—),男,高级工程师,博士,主要研究方向为金属材料组织与性能,E-mail:sxdcd@126.com。
  • 基金资助:
    国家自然科学基金 (51861001);广西自然科学基金联合资助培育项目(2018GXNSFAA138133);广西高等教育本科教学改革工程项目(2021JGZ157)

Effect of heat treatment temperature on solidification microstructure and hardness of Al-Gd alloy

Shi Xiangdong1,2,3, Li Degui1,2, Cao Alin1,2, Gu Bin1,2, Liang Liuqing1,2   

  1. 1. School of Materials Science and Engineering, Baise University, Baise Guangxi 533000, China;
    2. Engineering Research Center of Aluminum-based New Materials of Guangxi Zhuang Autonomous Region, Baise Guangxi 533000, China;
    3. China Heat Treatment Association, Beijing 100101, China
  • Received:2022-03-20 Revised:2022-06-21 Online:2022-08-25 Published:2022-09-19

摘要: 对真空电弧炉熔炼后的Al-52%Gd(质量分数)合金在不同温度下进行热处理,利用光学显微镜、扫描电镜、洛氏硬度计等研究了不同加热温度对其凝固组织和硬度的影响。结果表明,当加热温度为600 ℃时,初晶相由粗大发达树枝晶被较均匀的等轴晶取代;共晶相的形态由片网状向短杆状、点状过渡,生长方式逐渐由附着在初晶相周围生长向独立生长转变;硬度的变化为随着加热温度升高先下降后上升再迅速下降,中心硬度值与均值硬度在不同加热温度下有所差异,主要由凝固组织的疏松和初晶相Al3Gd的形态与分布决定。

关键词: 热处理温度, Al-Gd合金, 凝固组织, 硬度

Abstract: Al-52%Gd(mass fraction)alloy smelted by vacuum arc furnace was heat treated at different temperatures. The effect of heating temperature on solidification microstructure and hardness of the Al-52%Gd alloy was studied by means of optical microscope, scanning electron microscope, Rockwell hardness tester and so on. The results show that the primary crystal phase changes from coarse developed dendrites to more uniform equiaxed crystals when the heating temperature is 600 ℃. The morphology of eutectic phase transforms from lamellar network to short rod and dot, and the growth mode gradually changes from attaching the primary phase to independence. As the heating temperature increases, the hardness decreases first, then increases and then rapidly decreases. The central hardness value and average hardness value have difference at different heating temperatures, which is mainly determined by the porosity of solidification microstructure as well as the morphology and distribution of primary phase Al3Gd.

Key words: heat treatment temperature, Al-Gd alloy, solidification microstructure, hardness

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