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Transmission electron microscopy characterization of dislocation structure in a face-centered cubic high-entropy alloy Al 0.1 CoCrFeNi
Acta Materialia ( IF 9.4 ) Pub Date : 2018-02-01 , DOI: 10.1016/j.actamat.2017.10.050
X.D. Xu , P. Liu , Z. Tang , A. Hirata , S.X. Song , T.G. Nieh , P.K. Liaw , C.T. Liu , M.W. Chen

Abstract Structural characterization of dislocations and dislocation reactions in a face-centered cubic high entropy alloy was conducted using the state-of-the-art spherical aberration corrected transmission electron microscopy. We experimentally measured the stacking fault energy of the high entropy alloy from the atomic images and diffraction contrast of dislocation cores. The low stacking fault energy results in widely dissociated dislocations and extensive dislocation reactions, which leads to the formation of immobile Lomer and Lomer-Cottrell dislocation locks. These dislocation locks act as both dislocation barriers and sources and are responsible for the significant work hardening with a large hardening rate in the alloy. Based on the atomic-scale characterization and classical dislocation theory, a simple equation was derived to describe the work hardening behavior of the high entropy alloy in the early-stage of plastic deformation.

中文翻译:

面心立方高熵合金Al 0.1 CoCrFeNi中位错结构的透射电镜表征

摘要 使用最先进的球差校正透射电子显微镜对面心立方高熵合金中的位错和位错反应进行了结构表征。我们通过位错核的原子图像和衍射对比实验测量了高熵合金的堆垛层错能。低堆垛层错能导致广泛离解的位错和广泛的位错反应,导致形成固定的 Lomer 和 Lomer-Cottrell 位错锁。这些位错锁既是位错屏障又是位错源,是合金中显着加工硬化和高硬化率的原因。基于原子尺度表征和经典位错理论,
更新日期:2018-02-01
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