期刊
ACTA MATERIALIA
卷 61, 期 8, 页码 2993-3001出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2013.01.059
关键词
High-entropy alloys; Nanoindentation; Pop-in; Activation volume and energy; Dislocation nucleation
资金
- National Science Foundation [DMR-0905979]
- Tennessee Agricultural Experiment Station
- National Natural Science Foundation of China [50901006, 51010001, 51001009]
- Program of Introducing Talents of Discipline to Universities [B07003]
- Program for Changjiang Scholars and Innovative Research Team in University
- UT College of Engineering
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [0905979] Funding Source: National Science Foundation
Instrumented nanoindentation was conducted on a FeCoCrMnNi high-entropy alloy with a single face-centered cubic structure to characterize the nature of incipient plasticity. Experiments were carried out over loading rates of 25-2500 mu N s(-1) and at temperatures ranging from 22 to 150 degrees C. The maximum shear stress required to initiate plasticity was found to be within 1/15 to 1/10 of the shear modulus and relatively insensitive to grain orientation. However, it was strongly dependent upon the temperature, indicating a thermally activated process. Using a statistical model developed previously, both the activation volume and activation energy were evaluated and further compared with existing dislocation nucleation models. A mechanism consisting of a heterogeneous dislocation nucleation process with vacancy-like defects (similar to 3 atoms) as the rate-limiting nuclei appeared to be dominant. (c) 2013 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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