期刊
INTERNATIONAL JOURNAL OF PLASTICITY
卷 122, 期 -, 页码 212-224出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijplas.2019.07.003
关键词
Portevin-Le Chatelier effect; Serration mechanism; Medium-entropy alloy; High-entropy alloy; Substitutional alloy
资金
- Ministry of Science and Technology (Taiwan) [MOST 106-2218-E-007-019]
- High-Entropy Materials Center from the Featured Areas Research Center Program
- US National Science Foundation (NSF) [DMR 100520, DMS 1069224, DMR-1611180, 1809640]
- Department of Energy (DOE) [NEUP 00119262, DE-FE-0008855]
- DOE [DE-FE-0011194]
- U.S. Army Research Office project [W911NF-13-1-0438]
Serration phenomena during tensile testing on certain alloys with diffusing solute atoms (i.e., Portevin-Le Chatelier effect) have been observed for a long time, but detailed mechanisms are not fully clear yet. This study is intended to find the mechanism from different approaches verified by tensile testing on a series of single-phase face-centered-cubic (FCC) pure metal and alloys: Ni, CoNi, CoFeNi, CoCrFeNi, and CoCrFeMnNi, which range from low to high configurational entropy. The results of tensile tests, at strain rates from 1 x 10(-5) to 1 x 10(-2)/s and temperature from room temperature to 700 degrees C, show that serrations occur on stress-strain curves of CoFeNi, CoCrFeNi, and CoCrFeMnNi alloys in their specific temperature and strain-rate regime. A mechanism for dislocation pinning is proposed and verified with theoretical calculation for the present substitutional alloys. The proposed mechanism involves the in-situ rearrangement of substitutional solute atoms by local dislocation-core diffusion and might also be applied to similar substitutional alloys.
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