用中子衍射峰剖面分析CrCoNi基中熵合金的层错能、位错密度和双错概率

SRPN: Innovation (Topic) Pub Date : 1900-01-01 DOI:10.2139/ssrn.3474464

Wanchuck Woo, Ph.D, M. Naeem, J. Jeong, S. Harjo, T. Kawasaki, Haiyan He, Xun-li Wang

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引用次数: 1

摘要

采用中子衍射峰剖面分析方法测定了293K和140K时CrCoNi和CrCoNiFe中熵合金的层错能(SFE)、位错密度和双错概率(Ptw)。在293K时，CrCoNi的Ptw(高达3.8%)和位错密度(高达9.7 x 1015 m-2)均高于CrCoNiFe(分别为1.3%和3.4 x 1015 m-2)。同时，在140K时，CrCoNiFe的Ptw显著增加到4.4%。主要的孪生变形是由于CrCoNi在293K和CrCoNiFe在140K时的sfe较低(16.1 mJ/m2)，而CrCoNiFe在293K时的sfe为32.1 mJ/m2。

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Stacking Fault Energy, Dislocation Density, and Twin Fault Probability Determined by Neutron Diffraction Peak Profile Analysis in CrCoNi Based Medium Entropy Alloys

Neutron diffraction peak profile analysis was used to determine stacking fault energy (SFE), dislocation density, and twin fault probability (P_tw) in CrCoNi and CrCoNiFe medium entropy alloys at 293K and 140K. The CrCoNi shows higher P_tw (up to 3.8%) and dislocation density (up to 9.7 x 10¹⁵ m^-2) than CrCoNiFe (1.3% and 3.4 x 10¹⁵ m^-2, respectively) at 293K. Meanwhile, at 140K, the P_tw in CrCoNiFe increases significantly to 4.4%. The dominant twinning deformation is due to the lower SFEs of CrCoNi (16.1 mJ/m²) at 293K and CrCoNiFe (7.4 mJ/m²) at 140K compared to 32.1 mJ/m² for CrCoNiFe at 293K.

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SRPN: Innovation (Topic)

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