Combining tensile tests and nanoindentation to explore the strengthening of high and medium entropy alloys
Combining tensile tests and nanoindentation to explore the strengthening of high and medium entropy alloys
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DOI：
10.1016/j.mtla.2019.100404
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发表时间：
2019-09-01
期刊：
影响因子：
3.4
通讯作者：
Guillot, I.
中科院分区：
文献类型：
--
作者：
Laurent-Brocq, M.;Perriere, L.;Guillot, I.
单相多组分合金存在于非常宽的组成范围内，这仍然是大多未开发的。为了确定一种新的中熵合金（MEA）的机械性能并评估加速测试策略的潜力，研究了成分CoCrFeMnNi、（CoCrFeMn）（40）Ni-60和（CoCrFeMn）（8）Ni-92。它们被处理在均匀化和再结晶状态，其特征在于，通过扫描电子显微镜加上电子背散射衍射和机械拉伸试验和纳米压痕测试。结果表明，（CoCrFeMn）（40）Ni-60 MEA具有与CoCrFeMnNi高熵合金一样高的拉伸性能。两种合金不仅具有相同的机械强度，而且具有相同的延展性。此外，纳米压痕均匀化样品的拉伸屈服强度进行比较时的不确定性进行了量化。知道这一点，纳米压痕均匀HEA被确定为一个强大的工具，快速探索的化学成分和预选最有前途的。
Single-phase multi-component alloys exist for a very wide range of composition, which is still mostly unexplored. To determine the mechanical properties of one new medium entropy alloy (MEA) and to assess the potential of an accelerated testing strategy, the compositions CoCrFeMnNi, (CoCrFeMn)(40) Ni-60 and (CoCrFeMn)(8) Ni-92 were studied. They were processed in homogenized and recrystallized states, characterized by scanning electron microscopy coupled with electron backscattered diffraction and mechanically tested by tensile tests and nanoindentation. It was shown that the (CoCrFeMn)(40)Ni-60 MEA exhibits as high tensile properties as the CoCrFeMnNi high entropy alloy. Not only the mechanical strength but also the ductility are the same in both alloys. Moreover, the uncertainty when comparing nanoindentation on homogenized samples with tensile yield strength was quantified. Knowing that, nanoindentation on homogenized HEA was identified as a powerful tool for fast exploring of chemical compositions and pre-selection of the most promising ones.