纳米压痕法研究单晶Al3Sc相的硬度和杨氏模量  

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

作　　者：李浩楠 高坤元[1] 丁宇升 吴晓蓝 黄晖[1] 文胜平[1] 聂祚仁[1] Li Haonan;Gao Kunyuan;Ding Yusheng;Wu Xiaolan;Huang Hui;Wen Shengping;Nie Zuoren(The Key Laboratory of Advanced Functional Materials,College of Materials Science and Engineering,Beijing University of Technology,Beijing 100124,China)

机构地区：[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

出　　处：《金属热处理》2020年第2期250-252,共3页Heat Treatment of Metals

基　　金：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)。

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。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.

关 键 词：单晶 纳米压痕法 杨氏模量 各向异性 

分 类 号：TG166.3[金属学及工艺—热处理]