Compositive role of refractory element Mo in improving strength and ductility of face-centered-cubic complex concentrated alloys

Jang, Tae Jin; Lee, You-Na; Ikeda, Yûji; Körmann, Fritz; Baek, Jong-Kyu; Do, Hyeon-Seok; Choi, Yeon Taek; Gwon, Hojun; Suh, Jin-Yoo; Kim, Hyoung Seop; Lee, Byeong-Joo; Zargaran, Alireza; Sohn, Seok Su

doi:10.1016/j.actamat.2023.119030

Cited by 22 publications

(1 citation statement)

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“…Mo is a particularly effective microalloying element, since it is not only dissolved into the FCC solid solution but also readily forms the hard intermetallic compound [22][23][24]. Mo has a larger atomic radius and is mainly used for displacement solid solution strengthening.…”

Section: Introductionmentioning

confidence: 99%

Improving Mechanical Properties of Co-Cr-Fe-Ni High Entropy Alloy via C and Mo Microalloying

Lv,

Guo,

Zhang

et al. 2024

Materials

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The as-cast [Co40Cr25(FeNi)35−yMoy]100−xCx (x = 0, 0.5, y = 3, 4, 5 at.%) HEAs (high-entropy alloys) were prepared by a vacuum arc melting furnace and were then hot rolled. The effect of C and Mo elements on the microstructure evolution and mechanical properties of HEAs was systematically analyzed. The results showed that when no C atoms were added, the HEAs consisted of FCC + HCP dual-phase structure. In addition, as the Mo content increased, the grain size of the alloy increased from 17 μm to 47 μm. However, only the FCC phase appeared after adding 0.5 at.% carbon in Mo microalloyed HEAs, and the grain size of the Mo4C0.5 HEA decreased significantly. Due to the Mo atom content exceeding the solid solution limit, the carbides of Mo combined with the C element appeared in the Mo5C0.5 HEA. The strength of C and Mo microalloyed HEAs significantly increased compared to HEAs with no C added. However, the Mo4C0.5 HEA exhibited excellent comprehensive mechanical properties, which was superior to a majority of reported HEAs and conventional metal alloys. Its yield strength, tensile strength, and elongation were 757 MPa, 1186 MPa, and 69%, respectively. The strengthening mechanism was a combination of fine grain strengthening, TWIP effect, and solid solution strengthening.

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Section: Introductionmentioning

confidence: 99%