High strength and deformation stability achieved in CrCoNi alloy containing deformable oxides
High strength and deformation stability achieved in CrCoNi alloy containing deformable oxides
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含有可变形氧化物的 CrCoNi 合金实现了高强度和变形稳定性
DOI：
10.1016/j.jmst.2022.06.026
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发表时间：
2022-07
影响因子：
10.9
通讯作者：
Qian Yu
中科院分区：
文献类型：
--
作者：
Jiawei Zou;Xiaoqian Fu;Yajing Song;Tianxin Li;Yiping Lu;Ze Zhang;Qian Yu
·CrCoNi-O高熵溶液中晶格畸变的扩展局部缓解了严重的界面失配，并导致基体-氧化物界面处的界面应变发生纳米级变化。·位错从固溶体相滑移到陶瓷相，使陶瓷相具有显著的变形能力。·双相样品的屈服强度是单相CrCoNi-O合金的两倍;获得了具有超高变形稳定性的强应变硬化，而单相CrCoNi-O样品表现出灾难性的剪切局部化。硬的第二相通常以牺牲延展性为代价来强化合金。在这项工作中，我们做了一个双相CrCoNi-O合金含有面心立方矩阵和氧化铬。一方面，分散的氧化铬纳米颗粒阻碍了位错运动，提高了合金的强度;另一方面，CrCoNi-O高熵溶液中晶格畸变的扩展局部缓解了严重的界面失配，导致基体-氧化物界面处的界面应变发生纳米级变化，有利于位错从一相向另一相的传递。因此，与之前使用的强而脆的氧化物纳米颗粒不同，这里的氧化物相可以在材料的塑性变形期间提供显著的位错活动。对比了添加和不添加氧化铬颗粒的CrCoNi-O合金的力学性能，发现双相试样的屈服强度是单相CrCoNi-O合金的2倍，并具有很强的应变硬化和超高的变形稳定性。双相材料在高应力下会形成高密度的纳米孪晶，从而产生显著的应变硬化效应。我们的研究结果揭示了优化组合的强度和塑性的化合物通过调制的界面应变场的变化的基础上扩展的晶格畸变。
• The spreading lattice distortion in CrCoNi-O high entropy solution locally relieved the severe interfacial mismatch and led to nanoscale variation of interfacial strain at the matrix-oxide interface. • Dislocations slip transferred from solid solution phase to ceramic phase, enabling the ceramic phase with significant deformability. • The yield strength of the dual-phase samples was twice of the single-phase CrCoNi-O alloy; strong strain hardening was obtained with ultra-high deformation stability, whereas the single-phase CrCoNi-O sample exhibited catastrophic shear localization. Hard secondary phases usually strengthen alloys at the expense of ductility. In this work, we made a dual-phase CrCoNi-O alloy containing a face centered cubic matrix and chromium oxide. On one side, the dispersed chromium oxide nano-particles impeded dislocation movement and increased the strength of the alloy. On another side, the spreading lattice distortion in CrCoNi-O high entropy solution locally relieved the severe interfacial mismatch and led to nanoscale variation of interfacial strain at the matrix-oxide interface, which facilitated dislocations’ transmission from one phase to another. Consequently, unlike the strong but brittle oxide nanoparticles used before, the oxide phase here can afford significant dislocation activities during material's plastic deformation. Comparing the mechanical properties of CrCoNi-O alloys with and without chromium oxide particles, it was found that the yield strength of the dual-phase samples was twice of the single phase CrCoNi-O alloy and strong strain hardening was obtained with ultra-high deformation stability. High density of nanotwins formed in dual-phase samples under high stress, resulting in significant strain hardening according to the well-known twinning-induced plasticity (TWIP) effect. Our results shed light on optimizing the combination of strength and plasticity of compounds by modulating the variation of interfacial strain field based on the spreading lattice distortion.
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影响因子：
9.4
作者：
Zhu Q.;Zhao S. C.;Deng C.;An X. H.;Song K. X.;Mao S. X.;Wang J. W.
通讯作者：
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影响因子：
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DOI：
10.1016/j.msea.2003.10.214
发表时间：
2004-07-15
影响因子：
6.4
作者：
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通讯作者：
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作者：
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通讯作者：
Gladman, T