金属热处理 ›› 2020, Vol. 45 ›› Issue (2): 250-252.DOI: 10.13251/j.issn.0254-6051.2020.02.049

• 测试与分析 • 上一篇    下一篇

纳米压痕法研究单晶Al3Sc相的硬度和杨氏模量

李浩楠, 高坤元, 丁宇升, 吴晓蓝, 黄晖, 文胜平, 聂祚仁   

  1. 北京工业大学 材料科学与工程学院 教育部先进功能材料重点实验室, 北京 100124
  • 收稿日期:2019-09-02 出版日期:2020-02-25 发布日期:2020-04-03
  • 通讯作者: 高坤元(1971—),女,教授,联系电话:010-67396439,E-mail:gaokunyuan@bjut.edu.cn
  • 作者简介:李浩楠(1994—),男,硕士研究生,主要从事金属间化合物的研究,E-mail:724943045@qq.com。
  • 基金资助:

    国家科技部重点研发项目(2016YFB0300801);国家自然科学基金(51621003,51671005);北京市自然科学基金(2162006)

Hardness and Young's modulus of Al3Sc single crystal studied by nanoindentation

Li Haonan, Gao Kunyuan, Ding Yusheng, Wu Xiaolan, Huang Hui, Wen Shengping, Nie Zuoren   

  1. The Key Laboratory of Advanced Functional Materials, College of Materials Science and Engineering, Beijing University of Technology, Beijing 100124, China
  • Received:2019-09-02 Online:2020-02-25 Published:2020-04-03

摘要:

使用EBSD和纳米压痕法研究毫米级块状单晶Al3Sc对应的取向、硬度和杨氏模量。试验结果表明,选用过共晶Al-Sc合金加热至液态后缓慢冷却(60 ℃/h)可以得到毫米级单晶Al3Sc,通过EBSD和纳米压痕法得到五个不同取向(567)、(139)、(124)、(113)和(144)单晶Al3Sc的硬度在3.7~4.3 GPa,复合弹性响应模量在143.6~146.1 GPa。对比不同泊松比下各取向的杨氏模量理论值与试验值,发现泊松比为0.188时二者之间差异最小,对应各取向的杨氏模量试验值在157.5~160.6 GPa。

关键词: 单晶, 纳米压痕法, 杨氏模量, 各向异性

Abstract:

Orientation, hardness and Young's modulus of Al3Sc single crystal were analyzed by using the electron back scatter diffraction (EBSD) and nanoindentation techniques. The results show that the Al3Sc single crystal of about 1 mm in scale can be obtained by cooling eutectic Al-Sc alloy at rate of 60 ℃/h after heating to liquid. The hardness of the Al3Sc single crystals orientated in (567), (139), (124), (113) and (144) directions is found to be between 3.7 and 4.3 GPa, and the composite elastic response modulus is between 143.6 and 146.1 GPa. By comparing the experimental and theoretical values of Young's modulus in each orientation under different Poisson's ratio, it can be concluded that the difference is the smallest when the Poisson's ratio is 0.188. The experimental Young's modulus in different orientations is between 157.5 and 160.6 GPa.

Key words: single crystal, nanoindentation, Young's modulus, anisotropy

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