Effect of stress on μ phase formation in single crystal superalloys

• Published in: Materials science & engineering. A, Structural materials : properties, microstructure and processing Vol. 528; no. 6; pp. 2704 - 2710
• Main Authors: Cheng, KuiYu, Jo, ChangYong, Jin, Tao, Hu, ZhuangQi
• Format: Journal Article
• Language: English
• Published: Kidlington Elsevier B.V 15.03.2011; Elsevier
• Subjects: Applied sciences; Compressing; Cross-disciplinary physics: materials science; rheology; Elasticity. Plasticity; Exact sciences and technology; Materials science; Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology; Metals. Metallurgy; Microstructure; Nickel base alloys; Phase diagrams and microstructures developed by solidification and solid-solid phase transformations; Physics; Precipitation; Regularity; Rhenium (Re); Single crystal superalloy; Single crystals; Stresses; Superalloys; Thermal exposure; Topologically close-packed (TCP) phase; Rhenium (Re); Thermal exposure; Single crystal superalloy; Topologically close-packed (TCP) phase; Nickel base alloys; Compression test; Tension test; Single crystal; Close packing; Superalloy; Precipitation; Transition metal alloy; Microstructure
• ISSN: 0921-5093; 1873-4936
• DOI: 10.1016/j.msea.2010.12.004

▶ The applied stress can affect the precipitation behavior of μ phase in superalloys. ▶ There is a certain regularity of the effect. Precipitation behavior of the μ phase under applied stress was systematically investigated in two single crystal superalloys CMSX-4 and R0. The investigation has shown that both the sign and magnitude of the applied stress can affect the precipitation behavior of the μ phase with a certain degree of regularity. At first, the precipitation of the μ phase varied significantly when a small amount of stress was applied, regardless of whether the specimen is under tension or under compression. Under most conditions however, precipitation of the μ phase was restrained by this low application of stress. After increasing the applied stress, precipitation of the μ phase increased relative to the amount of tension or decreased under compression.