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- Title
Strength–ductility balance optimization of Fe<sub>2</sub>NiCr<sub>0.5</sub>Cu<sub>0.2</sub>Al<sub>0.3</sub>Ti<sub>0.1</sub> multicomponent alloy via doping trace amounts of boron.
- Authors
Zhang, Guojia; Yan, Hongwei; Zhang, Yongan; He, Tao; Lu, Yiping
- Abstract
Precipitation strengthening/hardening technique is known to significantly improve the strength of multicomponent/high-entropy (MCA/HEA) alloys at the expense of their serious embrittlement. Therefore, a proper adjustment of precipitated particles' type, size, and volume fraction is critical to achieve a good strength-plasticity balance. This study proposes a new MCA design approach involving doping trace amounts of boron to strengthen the ductile face-centered cubic (FCC) matrix phase instead of conventional thermomechanical processes to achieve excellent performance. A 90 ppm boron doping in the Fe2NiCr0.5Cu0.2Al0.3Ti0.1 MCAs significantly improved their mechanical properties, increasing their yield strength by 33.2% and ultimate tensile strength by 25.1% at relatively high ductility (21.3–25.2%). The addition of trace amounts of boron inhibited the formation and segregation of coarse BCC-based Heusler particles at the grain boundaries while promoting the formation of fine L12-type nanoscale precipitates, possessing a coherent relationship with the matrix. These findings are considered instrumental in designing the optimal strategy for enhancing balanced strength/ductility properties of FCC-based MCAs/HEAs with high economic feasibility and a wide range of industrial applications.
- Subjects
COPPER-titanium alloys; TENSILE strength; HEUSLER alloys; BORON; FACE centered cubic structure; CRYSTAL grain boundaries
- Publication
Journal of Materials Science, 2023, Vol 58, Issue 16, p7106
- ISSN
0022-2461
- Publication type
Article
- DOI
10.1007/s10853-023-08442-2