期刊
出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2017.01.027
关键词
High entropy alloys; High-temperature deformation; Phase stability; Microstructure; Precipitation hardening
类别
资金
- National Natural Science Foundation of China [51531001, 51671018, 51422101, 51271212, 51371003]
- 111 Project
- International S & T Cooperation Program of China [2015DFG52600]
- Program for Changjiang Scholars and Innovative Research Team in University [IRT_14R05]
- Top Notch Young Talents Program
- Fundamental Research Fund for the Central Universities [FRF-TP-15-004C1, FRF-TP-14-009C1]
- Program for New Century Excellent Talents in University [NCET-13-0663]
- NSF [DMR-1408722]
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [1408722] Funding Source: National Science Foundation
In this work, we systematically investigated flow behavior of a high entropy alloy (HEA) strengthened by coherent gamma' precipitates in the temperature range of 1023-1173 K. In contrast to the single-phase FeCoNiCrMn HEA, this precipitate-hardened alloy, i.e., (FeCoNiCr)(94)Ti2Al4, exhibited large reduction of the steady-state strain rate (by similar to 2 orders of magnitude) or drastic enhancement in flow stress, indicating significant improvement in high-temperature properties. Our results showed that the deformation could be divided into two regimes. At temperatures below 1123 K, coherent gamma' precipitates effectively blocked the dislocation motion, thus resulted in a threshold stress effect. Above 1123 K, however, gamma' particles dissolved and the deformation was controlled by the ordinary dislocation climb mechanism. In addition, we conducted transmission electron microscopy to characterize dislocation-precipitate interaction to provide microstructural evidences to support our conclusion of the specific deformation mechanisms in the two temperature regimes.
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