TY - JOUR
T1 - Microstructure evolution and mechanical properties of CrFeNixV0.64Ta0.36 eutectic high-entropy alloys
AU - Lin, Xin
AU - Wang, Mingliang
AU - Ren, Guangyu
AU - Qiao, Dongxu
AU - Lu, Yiping
AU - Wang, Tongmin
AU - Li, Tingju
N1 - Publisher Copyright:
© 2021 Elsevier Inc.
PY - 2021/11
Y1 - 2021/11
N2 - Eutectic high entropy alloys (EHEAs) have attracted considerable interest because of their excellent casting fluidity and outstanding mechanical properties. In this study, a novel system of EHEAs, namely CrFeNixV0.64Ta0.36 (1.3 ≤ x ≤ 1.9) was designed and prepared. The microstructure evolution and mechanical properties of CrFeNixV0.64Ta0.36 EHEAs were investigated in as-cast state. The results showed that the alloy was composed of σ-phase, Fe7Ta3-type intermetallic compounds (IMC), and a small amount of the eutectic phase when x = 1.3. A rare bimodal eutectic microstructure [face-centered-cubic (FCC) structure /σ + Fe7Ta3-type IMC] was observed in EHEAs, even in high entropy alloys when x = 1.6, 1.7, 1.8, and 1.84. The typical hypo-eutectic microstructure was acquired when x was increased to 1.9. The fully eutectic composition, i.e., CrFeNi1.85V0.64Ta0.36 with alternatingly lamellar FCC and Fe7Ta3-type IMC structures exhibited the best mechanical properties, with the compressive yield strength, fracture strength, and engineering strain being 1475.9 MPa, 2799 MPa, and 38.095%, respectively.
AB - Eutectic high entropy alloys (EHEAs) have attracted considerable interest because of their excellent casting fluidity and outstanding mechanical properties. In this study, a novel system of EHEAs, namely CrFeNixV0.64Ta0.36 (1.3 ≤ x ≤ 1.9) was designed and prepared. The microstructure evolution and mechanical properties of CrFeNixV0.64Ta0.36 EHEAs were investigated in as-cast state. The results showed that the alloy was composed of σ-phase, Fe7Ta3-type intermetallic compounds (IMC), and a small amount of the eutectic phase when x = 1.3. A rare bimodal eutectic microstructure [face-centered-cubic (FCC) structure /σ + Fe7Ta3-type IMC] was observed in EHEAs, even in high entropy alloys when x = 1.6, 1.7, 1.8, and 1.84. The typical hypo-eutectic microstructure was acquired when x was increased to 1.9. The fully eutectic composition, i.e., CrFeNi1.85V0.64Ta0.36 with alternatingly lamellar FCC and Fe7Ta3-type IMC structures exhibited the best mechanical properties, with the compressive yield strength, fracture strength, and engineering strain being 1475.9 MPa, 2799 MPa, and 38.095%, respectively.
KW - Eutectic alloys
KW - High-entropy alloys
KW - Mechanical properties
KW - Microstructure evolution
UR - http://www.scopus.com/inward/record.url?scp=85114996668&partnerID=8YFLogxK
U2 - 10.1016/j.matchar.2021.111449
DO - 10.1016/j.matchar.2021.111449
M3 - 文章
AN - SCOPUS:85114996668
SN - 1044-5803
VL - 181
JO - Materials Characterization
JF - Materials Characterization
M1 - 111449
ER -