TY - JOUR
T1 - Cooperative effects of Mo and B additions on the microstructure and mechanical properties of multi-elemental Nb-Si-Ti based alloys
AU - Li, Zhaobo
AU - Luo, Liangshun
AU - Wang, Binbin
AU - Su, Baoxian
AU - Luo, Lei
AU - Wang, Liang
AU - Su, Yanqing
AU - Guo, Jingjie
AU - Fu, Hengzhi
N1 - Publisher Copyright:
© 2023
PY - 2023/12
Y1 - 2023/12
N2 - The multi-elemental Nb-Si-Ti based alloys with Mo and B additions are prepared by vacuum non-consumable arc melting. The cooperative effects of Mo and B additions on the microstructure, room-temperature fracture and high-temperature compressive strength are investigated. The additions of Mo and B basically cannot affect the constituent phases of the Nb-Si-Ti based alloys. The fracture toughness of Nb-Si-Ti based alloys is deteriorated by alloying with Mo or B individually. However, the cooperative additions of Mo and B inversely increases the fracture toughness, owing to the existence of chaotic eutectics. Moreover, the individual or cooperative additions of Mo and B distinctly increase the high-temperature compressive strength at 1200 °C due to the solution strengthening effects of Mo and B. Among all alloys, the 1Mo–2B alloy not only exhibits the highest room-temperature fracture toughness (15.99 MPa•m1/2) because of the numerous chaotic eutectics and low proportion of primary α-Nb5Si3, but also maintains the high-temperature compressive strength of 286 MPa. Furthermore, many orientation relationships between Nbss and Nb5Si3 are observed in 1Mo–2B and 3Mo–4B alloys.
AB - The multi-elemental Nb-Si-Ti based alloys with Mo and B additions are prepared by vacuum non-consumable arc melting. The cooperative effects of Mo and B additions on the microstructure, room-temperature fracture and high-temperature compressive strength are investigated. The additions of Mo and B basically cannot affect the constituent phases of the Nb-Si-Ti based alloys. The fracture toughness of Nb-Si-Ti based alloys is deteriorated by alloying with Mo or B individually. However, the cooperative additions of Mo and B inversely increases the fracture toughness, owing to the existence of chaotic eutectics. Moreover, the individual or cooperative additions of Mo and B distinctly increase the high-temperature compressive strength at 1200 °C due to the solution strengthening effects of Mo and B. Among all alloys, the 1Mo–2B alloy not only exhibits the highest room-temperature fracture toughness (15.99 MPa•m1/2) because of the numerous chaotic eutectics and low proportion of primary α-Nb5Si3, but also maintains the high-temperature compressive strength of 286 MPa. Furthermore, many orientation relationships between Nbss and Nb5Si3 are observed in 1Mo–2B and 3Mo–4B alloys.
KW - Fracture toughness
KW - High-temperature compression strength
KW - Microstructure
KW - Orientation relationship
UR - http://www.scopus.com/inward/record.url?scp=85175366893&partnerID=8YFLogxK
U2 - 10.1016/j.matchar.2023.113421
DO - 10.1016/j.matchar.2023.113421
M3 - Review article
AN - SCOPUS:85175366893
SN - 1044-5803
VL - 206
JO - Materials Characterization
JF - Materials Characterization
M1 - 113421
ER -