Cooperative effects of Mo and B additions on the microstructure and mechanical properties of multi-elemental Nb-Si-Ti based alloys

被引：10
作者：
Li, Zhaobo [1 ]
Luo, Liangshun [1 ]
Wang, Binbin [1 ]
Su, Baoxian [1 ]
Luo, Lei [2 ]
Wang, Liang [1 ]
Su, Yanqing [1 ]
Guo, Jingjie [1 ]
Fu, Hengzhi [1 ]
机构：
[1] Harbin Inst Technol, Sch Mat Sci & Engn, Natl Key Lab Precis Hot Proc Met, Harbin 150001, Peoples R China
[2] Nanjing Univ Aeronaut & Astronaut, Coll Mat Sci & Technol, Nanjing 210016, Peoples R China
来源：
MATERIALS CHARACTERIZATION | 2023年 / 206卷
基金：
中国国家自然科学基金;
关键词：
Microstructure; Fracture toughness; High-temperature compression strength; Orientation relationship; HIGH-TEMPERATURE STRENGTH; SOLID PHASE-EQUILIBRIA; FRACTURE-TOUGHNESS; OXIDATION RESISTANCE; ORIENTATION RELATIONSHIP; EVOLUTION; COMPOSITES; CR; BEHAVIOR; RECRYSTALLIZATION;
D O I：
10.1016/j.matchar.2023.113421
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
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 degrees C due to the solution strengthening effects of Mo and B. Among all alloys, the 1Mo-2B alloy not only exhibits the highest roomtemperature fracture toughness (15.99 MPa center dot m1/2) because of the numerous chaotic eutectics and low proportion of primary alpha-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.
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页数：18
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