金属热处理 ›› 2022, Vol. 47 ›› Issue (3): 151-154.DOI: 10.13251/j.issn.0254-6051.2022.03.029

• 材料研究 • 上一篇    下一篇

成分和冷却速度对Al-xEr合金凝固组织的影响

宁静, 高坤元, 李浩楠, 文胜平, 黄晖, 吴晓蓝, 魏午, 聂祚仁   

  1. 北京工业大学 材料与制造学部 教育部先进功能材料重点实验室, 北京 100124
  • 收稿日期:2021-10-16 修回日期:2021-12-13 出版日期:2022-03-25 发布日期:2022-04-22
  • 通讯作者: 高坤元,教授,E-mail:gaokunyuan@bjut.edu.cn
  • 作者简介:宁 静(1995—),女,硕士研究生,主要研究方向为金属间化合物,E-mail:N18712721968@126.com。
  • 基金资助:
    国家科技部重点研发项目(2021YFB3704201,2021YFB3704202);国家自然科学基金(51671005);北京市自然科学基金(2202009)

Effects of composition and cooling rate on solidification structure of Al-xEr alloy

Ning Jing, Gao Kunyuan, Li Haonan, Wen Shengping, Huang Hui, Wu Xiaolan, Wei Wu, Nie Zuoren   

  1. Key Laboratory of Advanced Functional Materials, Education Ministry of China, Faculty of Materials and Manufacturing, Beijing University of Technology, Beijing 100124, China
  • Received:2021-10-16 Revised:2021-12-13 Online:2022-03-25 Published:2022-04-22

摘要: 用扫描电镜(SEM)和X射线衍射仪(XRD)分析了Al-xEr(x=10、20、30,质量分数,%)合金凝固组织的形貌和相结构。结果表明,在60 ℃/h的冷却速率下,Al-10Er合金中Al3Er相为L12结构,尺寸约为200 μm,相与相之间以鱼骨状连接。当Er含量增大到30%时,初生Al3Er相呈块状,尺寸约为1 mm。对Al-30Er合金,随冷却速率的降低,初生Al3Er相由轮廓平直的L12结构转变为轮廓呈波浪状的hR20结构,同时共晶组织由絮状转变成条状。

关键词: Al-Er合金, 成分, 冷却速度, 显微组织

Abstract: Microstructure and phase structure of solidified structure of the Al-xEr (x=10, 20, 30, mass fraction, %) alloy were analyzed by means of scanning electron microscope (SEM) and X-ray diffractometer (XRD), respectively. The results show that at cooling rate of 60 ℃/h, the structure of Al3Er phase in the Al-10Er alloy is L12 with size of about 200 μm, which are connected in a fishbone shape. With the increase of Er content to 30%, the primary Al3Er phase transforms into a block with size of about 1 mm. For the Al-30Er alloy, as the cooling rate decreases, the primary Al3Er phase changes from a straight L12 structure to a wavy hR20 structure, and the eutectic structure changes from flocculent to striped.

Key words: Al-xEr alloy, composition, cooling rate, microstructure

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