Enhancing the mechanical properties via HCP phase induction in CrFeNi <sub>2</sub> La <sub>x</sub> medium-entropy alloys by alloying La
La−modified CrFeNi2La x ( x = 0, 0.05, 0.15, 0.25) medium−entropy alloys were investigated to reveal La's effects on phase evolution and mechanical properties. Thermodynamic and experimental analyses demonstrated that La addition transformed the single FCC phase into dual FCC + HCP phases, with HCP volume fraction increasing alongside La content. Grain refinement occurred from 412 to 245 μm with higher La concentrations. Mechanical properties improved significantly: hardness rose from 125 to 325 HV, yield strength surged from 110 to 839 MPa, and optimal fracture strength (1317 MPa) was achieved at 3.6 at.% La. These enhancements stemmed from combined effects of HCP phase formation, grain refinement, and La−induced strengthening mechanisms.
Authors
- Wenqing Wei (ORCID: https://orcid.org/0000-0001-9394-4702)
- Yongqiang Q. Cheng (ORCID: https://orcid.org/0000-0002-3263-4812)
- Yuanchao Miao
- Yubo Zhang (ORCID: https://orcid.org/0000-0001-8840-9422)
- Zhaolong Xiang (ORCID: https://orcid.org/0000-0001-8479-8408)
- Jing Sun (ORCID: https://orcid.org/0000-0003-2283-7525)
- Jingxiang Mao
Institutions
- Sailun Jinyu Group (China) (CN)
- Weifang University (CN)
- Shandong University of Science and Technology (CN)
Publication Details
- Journal
- Materials Science and Technology
- Published
- 2025-11-11
- DOI
- https://doi.org/10.1177/02670836251393912
- Primary Topic
- High Entropy Alloys Studies
- Type
- article
- Field-Weighted Citation Impact
- 0.00