| Autor: |
Wang, Lei, Wu, Xinyuan, Wu, Yuan, Liu, Gang, Han, Zhenhua, Zhang, Yunpeng, Su, Yanning, Kang, Shengfeng, Shen, Jun, Zhang, Guojun |
| Předmět: |
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| Zdroj: |
Journal of Materials Science & Technology; Jun2023, Vol. 149, p154-160, 7p |
| Abstrakt: |
• It provides a novel idea to design an MEA with the "fcc+L1 2 " structure ((CoFeNi) 80 Ti 5 V 15). • MEA is cold rolled followed by aging (SCA) to keep high strength (YS/UTS ∼1395/1565 MPa). • SCA alloy consists of non-recrystallization (L1 2) and recrystallization region (η). • High-density SFs are commonly observed in the present unformed SCA alloy. • High strength of SCA alloy mainly stems from L1 2 , η precipitate, and high-density SFs. This study provides a good design idea to obtain a novel (CoFeNi) 80 Ti 5 V 15 medium entropy alloy with a "face center cubic (fcc) + L1 2 " structure by substituting equiatomic CoFeNi for Co in the Co 80 Ti 5 V 15 superalloy and using the conventional thermomechanical processing method (solution+cold rolling+recrystallization annealing+aging, SCRA). In order to obtain superior strength, the recrystallization annealing procedure is removed (SCA), thus resulting in the formation of heterogeneous structures consisting of the recrystallization region and non-recrystallization region. In the recrystallization region, the grain consists of fcc matrix and η lamellar phase. In the non-recrystallization region, the high-density nanoscale L1 2 precipitates are uniformly distributed. The SCA (CoFeNi) 80 Ti 5 V 15 alloy exhibits a rather high yield strength of ∼1395 MPa and ultimate tensile strength of ∼1565 MPa together with acceptable tensile elongation of ∼9%. The high strength of SCA alloy originates from the L1 2 nano-precipitates, η lamellar precipitates, high-density SFs, heterogeneous structure, dislocation, and grain refinement strengthening. [ABSTRACT FROM AUTHOR] |
| Databáze: |
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