Journal
MATERIALS CHARACTERIZATION
Volume 203, Issue -, Pages -Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.matchar.2023.113120
Keywords
Medium-entropy alloys; Microstructural evolution; Coherent precipitates; Mechanical properties; Strengthening mechanism
Ask authors/readers for more resources
Novel Co-free Ni2FeCrWx medium-entropy alloys were designed by replacing Co with Ni in the CoCrFeNi high-entropy alloys. The effects of W addition and subsequent annealing treatment on microstructure evolution and mechanical properties were investigated. The addition of W promoted the formation of & mu; phase, while annealing treatment led to the precipitation of submicron-sized BCC particles and the spheroidization of & mu; phase. The annealed Ni2FeCrW0.5 alloy exhibited outstanding strength-ductility synergy with high ultimate tensile strength and excellent ductility.
In the present work, novel Co-free Ni2FeCrWx medium-entropy alloys (MEAs) are designed by equiatomically replacing Co with Ni in the CoCrFeNi high-entropy alloys (HEAs). The effects of W addition coupled with subsequent heat treatment on microstructure evolution and mechanical properties were systematically investigated and analyzed. The W-addition is conducive to the formation of & mu; phase in Ni2FeCrWx MEAs, while the annealing treatment promotes the precipitation of submicron-sized BCC particles and the spheroidization of & mu; phase. The orientation relationship (OR) of [1210]& mu; phase // [011]FCC and (3030)& mu; phase // (111)FCC and the coherent interface is formed between & mu; phase and FCC matrix in as-cast alloys, and the orientation relationship of the interfaces between BCC precipitate and FCC matrix have been clarified as the Kurdjumov-Sachs (KS) interfaces presenting [011]FCC //[111]BCC and (111)FCC // (011)BCC. The annealed Ni2FeCrW0.5 MEA exhibited outstanding strengthductility synergy, combining a high ultimate tensile strength of -982 MPa and an excellent ductility of -29%. Strengthening mechanisms were estimated and compared with experimental measurements, revealing that the coherent BCC/& mu; precipitates bring out effective precipitation strengthening.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available