期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 861, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2020.158562
关键词
Metals and alloys; Mechanical alloying; Crystal structure; Phase transitions; X-ray diffraction
资金
- Russian Science Foundation [20-13-00277]
- Russian Science Foundation [20-13-00277] Funding Source: Russian Science Foundation
Mechanical alloying and annealing were used to produce a powder of uniform high entropy alloy AlCoCrFeNi, leading to crystal lattice transformations and structural changes, with certain phases undergoing transition at specific temperatures, enhancing the alloy's properties.
A powder of uniform high entropy alloy AlCoCrFeNi was produced by relatively short-term (90 min) mechanical alloying in a planetary mill followed by annealing at 873, 1073 and 1273 K for 5.5 h. Results of high-temperature in situ XRD analyses demonstrated the occurrence of specific crystal lattice transformations taking place in major fcc and bcc phases during annealing and cooling down. Shrinkage of atomic structures was detected for all phases after annealing at any temperature, while precipitation of the sigma-phase occurred only at 1073 K. A drift of the (111) peak relative to the (200) peak of the fcc phase at 1273 K allowed us to assume the occurrence of weak martensitic transformations: a high-temperature cubic phase turns into slightly tetragonal phase (a/c = 1.00426) upon cooling down to room temperature. This transformation takes place without mechanical stress or deformation. Despite structural transformations, the major high-entropy phases remained after annealing. (C) 2020 Elsevier B.V. All rights reserved.
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