Evolution of In783 alloy in microstructure and properties enduring different service times

• Published in: Rare metals Vol. 43; no. 1; pp. 334 - 341
• Main Authors: Han, Zhong-Shuai, Du, Jin-Feng, Liang, Jun, Zhang, Zheng
• Format: Journal Article
• Language: English
• Published: Beijing Nonferrous Metals Society of China 2024; Springer Nature B.V
• Subjects: Beta phase; Biomaterials; Chemistry and Materials Science; Dislocations; Electron microscopy; Energy; Fatigue tests; Fracture toughness; Grain boundaries; Intergranular fracture; Materials Engineering; Materials Science; Metallic Materials; Microscopy; Microstructure; Morphology; Nanoscale Science and Technology; Nickel base alloys; Optical microscopy; Physical Chemistry; Scanning electron microscopy; Superalloys; Transmission electron microscopy; β phase; phase; In783; Ni; Al; Microstructure; Properties
• ISSN: 1001-0521; 1867-7185
• DOI: 10.1007/s12598-018-1099-6

Impact, tensile, and fatigue tests were performed in In783 alloy serving 4000, 23,000 and 48,000 h. The microstructure was then analysed by optical microscopy (OM), scanning electron microscopy (SEM), and transmission electron microscopy (TEM) to probe the relationship between microstructure and properties. The results show that a new Ni 5 Al 3 phase is found, which grows gradually in β phase with serving time increasing, destroying the martensitic structure of the β phase, and degenerating the toughness of the β phase (approximately 13.88% reduction). Therefore, the degradation of the β phase results in a sharp dropping of the resistance to stress accelerated grain boundary oxygen (SAGBO) during serving; thus, the intergranular fracture morphology degree increases with duration of service (almost 40% increase from the fractured surface). In addition, the strength of alloy will be gradually enhanced when the γ ′ phase becomes relatively bulky with serving time increasing due to considerable distortion of the dislocations as a result of the spacing of individual particles, in which any movement of the dislocation will have to overcome a larger number of obstacles per unit length.