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考虑CoCrFeNiAl0.3高熵合金压入尺寸效应的塑性参数研究
Study on the Plastic parameter of CoCrFeNiAl0.3 High Entropy Alloy Considering Indentation Size Effect
投稿时间:2019-09-23  修订日期:2020-05-22
DOI:
中文关键词:  高熵合金  纳米压入  多种压头  尺寸效应  塑性参数
英文关键词:High entropy alloy  Nanoindentation  Multiple indenters  Size effect  Plastic parameter
基金项目:国家自然科学基金资助(11772217, 11802198),山西省青年自然科学基金(201801D221026)
作者单位E-mail
孟璐 太原理工大学 机械与运载工程学院应用力学研究所 595033788@qq.com 
邱吉 太原理工大学 机械与运载工程学院应用力学研究所 1058011415@qq.com 
肖革胜 太原理工大学 机械与运载工程学院应用力学研究所 xiaogesheng@tyut.edu.cn 
苏步云 太原理工大学 机械与运载工程学院应用力学研究所 544892605@qq.com 
树学峰 太原理工大学 机械与运载工程学院应用力学研究所 shuxuefeng@tyut.edu.cn 
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中文摘要:
      本研究采用多种压头对CoCrFeNiAl0.3高熵合金进行了微尺度压入测试。实验结果表明,压头角度对CoCrFeNiAl0.3 高熵合金压入性能具有显著的影响。然后基于两种三棱锥压头的实验结果与压入的自相似过程,确立了该材料的塑性参数,进而得到了其应变硬化指数n。发现该硬化指数与宏观尺度下的应变硬化指数相比较,存在较大的偏差。为研究产生这一偏差的原因,本研究基于剔除尺寸效应的硬度和压头半锥角的关系,确立了一个剔除尺寸效应的塑性参数并给出了其应变硬化指数n0。最后,通过第三种三棱锥压头的测试结果对上述两种塑性参数进行了验证,并与单轴拉伸得到的塑性参数进行对比。结果表明,两个塑性参数均可较好的预测其它角度压头的测试结果,然而仅有剔除尺度效应的硬化指数与宏观尺度下的实验结果较为吻合,所以通过压入实验来获取材料塑性参数时,尺度效应的影响是不可忽略的。同时,这一结论也表明,通过微尺度的压入测试来表征宏观尺度力学性能的方法是可行的。
英文摘要:
      In this paper, the nanoindentation experiment was performed on CoCrFeNiAl0.3 high-entropy alloy using multiple indenters. Experimental results show that the indenter angle has a significant effect on the indentation performance of CoCrFeNiAl0.3 HEA. Then, based on the experimental results of the two three-sided pyramidal indenters and self-similar process of the indentation, the plastic parameter of the material is established, and the work-hardening exponent n is obtained. It is found that there is a large deviation between the work-hardening exponent and that in macroscopic scale. In order to study the reason for this deviation, a new plastic parameter and the work-hardening exponent n0 are obtained from the relationship between the hardness and the half-angle of a conical indenter based on the size effect of eliminating. Finally, the above two plastic parameter relationships were verified by the indentation results of the third three-sided pyramidal indenter and compared with the plastic parameter obtained by uniaxial tensile test. The results show that both two plastic parameter relationships can well predict the test results of other angle indenters. However, only the work-hardening exponent eliminating the size effect is consistent with the experimental results at the macroscopic scale. Therefore, so the influence of the size effect cannot be ignored when the plastic parameter of the material is obtained through the indentation test. At the same time, this conclusion also indicates that the method of characterizing macroscopic mechanical properties by nanoindentation test is feasible.
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