期刊
SCRIPTA MATERIALIA
卷 204, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.scriptamat.2021.114157
关键词
Dislocation structure; Plastic deformation; Work hardening; Martensitic phase transformation; Maraging medium-entropy alloys
类别
资金
- Creative Materials Discov-ery Program through the National Research Foundation of Ko-rea (NRF) - Ministry of Science and ICT [NRF- 2016M3D1A1023384]
- Na-tional Research Foundation of Korea (NRF) - Korea government (MSIP) [NRF-2021R1A2C3006662]
- Brain Pool Program through the National Research Foundation of Ko-rea [2017H1D3A1A01013666, 2019H1D3A1A01102866]
- National Research Foundation of Korea [4199990514509, 2017H1D3A1A01013666, 2019H1D3A1A01102866] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
This study presents a novel FeCoNiAlTiMo medium-entropy alloy with ultra-high tensile strengths at 298K and 77K. Through hot rolling without further heat treatment, a quasi-dual-phase microstructure with high density of dislocations and Mo-rich mu phase precipitates was created, leading to increased strain hardening ability.
A novel non-equiatomic FeCoNiAlTiMo ferrous medium-entropy alloy (MEA) with ultra-high tensile strengths at 298 and 77 K is presented in this work. By subjecting the MEA to hot rolling without further heat treatment, a quasi-dual-phase microstructure consisting of retained face-centered cubic (FCC) and thermal body-centered cubic martensite (BCC) phases with a very high density of dislocations and precipitates of Mo-rich mu phase was created. The high dislocation density significantly accelerated deformation-induced martensitic transformation from the remaining metastable FCC to BCC and successfully increased strain hardening ability. The strain hardening ability was even higher at 77 K due to decreasing FCC phase stability at lower temperatures. The increased strain hardening ability led to an excellent balance of strength and ductility, with ultimate tensile strength/uniform elongation of similar to 1.5 GPa/similar to 15% at 298 K and similar to 2.3 GPa/similar to 11% at 77 K. (C) 2021 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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