Deformation mechanisms in single crystal Ni-based concentrated solid solution alloys by nanoindentation
Deformation mechanisms in single crystal Ni-based concentrated solid solution alloys by nanoindentation
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DOI：
10.1016/j.msea.2022.143685
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发表时间：
2022-08
期刊：
影响因子：
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通讯作者：
Liuqing Yang;Youxing Chen;Jimmie A. Miller;W. J. Weber;H. Bei;Yanwen Zhang
中科院分区：
文献类型：
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作者：
Liuqing Yang;Youxing Chen;Jimmie A. Miller;W. J. Weber;H. Bei;Yanwen Zhang
纳米压痕是探测微米和亚微米尺度机械性能的关键技术，伴随着压痕尺寸效应、堆积/下沉效应和应变率敏感性的挑战。在本研究中，采用不同的纳米压痕技术探索添加了Co、Cr、Mn和Fe等3d过渡金属元素的镍基浓固溶体合金（CSA），包括具有（100）表面的独特单晶Ni、NiCo、NiFe、Ni80Cr20和NiCoFeCr样品。开发了纳米压痕测试和数据分析/校正程序，并提供了镍基CSA的硬度、弹性模量、应变率灵敏度和活化体积的数据集，包括较少探索的二元合金，例如Ni80Cr20和Ni80Mn20。结果表明，合金元素的类型比元素数量对强化作用更为关键：Co在NiCo中不提供强化作用，而Cr、Mn和Fe是有效的强化元素。 Cr是所有3d过渡金属元素中最有效的。此外，原子级晶格畸变是强化的原因，而堆垛层错能的作用在室温下的镍基 CSA 中并不显着。总之，纳米压痕作为一种可靠、快速的工具，为新合金设计和开发提供全面的机械信息，显示出越来越大的前景。
Nanoindentation is a critical technique to probe mechanical properties at the micrometer and sub-micrometer scales, accompanied by challenges from indentation size effect, pile-up/sink-in effect, and strain rate sensitivity. In this study, different nanoindentation techniques have been employed to explore Ni-based concentrated solid solution alloys (CSAs) with the addition of 3dtransition metal elements including Co, Cr, Mn, and Fe, including unique single-crystal Ni, NiCo, NiFe, Ni80Cr20, and NiCoFeCr samples with (100) surfaces. A procedure of nanoindentation tests and data analysis/correction have been developed, and a data set of hardness, elastic modulus, strain rate sensitivity, and activation volume for Ni-based CSAs are provided, including the less explored binary alloys such as Ni80Cr20and Ni80Mn20. The results show that the type of alloying elements is more critical than the number of elements in strengthening: Co does not provide strengthening in NiCo, while Cr, Mn, and Fe are effective strengthening elements. Cr is the most effective among all the 3dtransition metal elements. Furthermore, atomic-level lattice distortion is responsible for the strengthening and the role of stacking fault energy is insignificant in Ni-based CSAs at room temperature. In summary, nanoindentation shows increasing promise as a reliable and fast tool to provide comprehensive mechanical information for new alloy design and development.