金属热处理 ›› 2021, Vol. 46 ›› Issue (4): 26-29.DOI: 10.13251/j.issn.0254-6051.2021.04.005

• 材料研究 • 上一篇    下一篇

铁含量对铸态铝铁合金力学性能及组织的影响

郑文悦1, 陈庆吟1,2, 洪静2, 侯嘉鹏3, 王强3, 张哲峰3   

  1. 1.浙江华电器材检测研究所有限公司 国家电力器材产品安全性能质量监督检验中心, 浙江 杭州 310015;
    2.浙江华云清洁能源有限公司, 浙江 杭州 310002;
    3.中国科学院金属研究所 材料疲劳与断裂实验室, 辽宁 沈阳 110016
  • 收稿日期:2020-12-15 出版日期:2021-04-25 发布日期:2021-05-08
  • 作者简介:郑文悦(1972—),男,高级工程师,硕士,主要研究方向为电力器材的试验与研究,E-mail:zheng123xiaoxiao@163.com
  • 基金资助:
    国家电网浙江省电力公司项目(5211HD190002);中国博士后科学基金(2019M661151)

Effect of Fe content on mechanical properties and microstructure of as-cast Al-Fe alloy

Zheng Wenyue1, Chen Qingyin1,2, Hong Jing2, Hou Jiapeng3, Wang Qiang3, Zhang Zhefeng3   

  1. 1. National Quality Supervision & Inspection Center of Electrical Equipment Safety Performance, Zhejiang Huadian Equipment Testing Institute Co., Ltd., Hangzhou Zhejiang 310015, China;
    2. Zhejiang Huayun Clean Energy Co., Ltd., Hangzhou Zhejiang 310002, China;
    3. Laboratory of Fatigue and Fracture for Materials, Institute of Metal Research, Chinese Academy of Sciences, Shenyang Liaoning 110016, China
  • Received:2020-12-15 Online:2021-04-25 Published:2021-05-08

摘要: 采用拉伸试验机、光学显微镜、扫描电镜、X射线衍射仪和三维纳米X射线显微镜等分析手段研究了铁含量对铸态Al-Fe合金力学性能和微观组织结构的影响。结果表明:随着铁含量的增大,铸态Al-Fe合金抗拉强度和屈服强度增大,断后伸长率下降。大量的球状Al6Fe析出相和杆状Al3Fe析出相分布在试验合金铸锭晶界附近,与铸态Al-1.8Fe合金相比,铸态Al-2.6Fe合金具有更小尺寸的晶粒和更大尺寸的Al3Fe析出相。尺寸更小的晶粒导致铸态Al-2.6Fe合金的强度高于铸态Al-1.8Fe合金,而铸态Al-2.6Fe合金伸长率更低的主要原因是具有更大尺寸的脆性Al3Fe析出相。

关键词: 铝铁合金, 力学性能, 晶粒, 析出相

Abstract: Effect of Fe content on mechanical properties and microstructure of as-cast Al-Fe alloy was studied by tensile testing machine, optical microscope, scanning electron microscopy, X-ray diffracter and three-dimensional nano-X-ray microscope. The results show that with the increase of Fe content, the tensile strength and yield strength of as-cast Al-Fe alloy increase, while the elongation decreases. A large number of spherical precipitates of Al6Fe and rod-shaped precipitates of Al3Fe are distributed near the grain boundary of the tested alloy ingots. Compared with the as-cast Al-1.8Fe alloy, the as-cast Al-2.6Fe alloy has finer grains and larger size precipitates of Al3Fe. And the finer grains lead to the higher strength of as-cast Al-2.6Fe alloy than that of as-cast Al-1.8Fe alloy. The main reason for the lower elongation of as-cast Al-2.6Fe alloy is the larger size of brittle precipitate of Al3Fe.

Key words: Al-Fe alloy, mechanical properties, grain, precipitated phase

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