Differences in the micromechanical properties of dendrites and interdendritic regions in superalloys

Effect of Ru on Deformation Mechanism and Microstructure Evolution of Single-Crystal Superalloys under Medium-Temperature and High-Stress Creep

“…Combining Figure 4 , one can conclude that fewer micro-voids and cracks in the 3Ru alloy provide the alloy with a longer creep rupture life under varying temperatures and stress conditions. Additionally, most of the micro-voids could be a result of casting, which originated at the interdendritic region or from the slow conglomeration of a high concentration of vacancies, as seen in Figure 5 e [ 27 ].…”

Impact on Mechanical Properties and Microstructural Response of Nickel-Based Superalloy GH4169 Subjected to Warm Laser Shock Peening

“…The vacancy–Nb pair diffused towards the defect and reduced the system energy, resulting in the Nb nonequilibrium. Because the driving force of this concentration gradient would lead to the movement of the γ”/δ interface, heat treatment at a lower temperature would promote the expansion and spheroidization of the decomposed α phase [ 18 , 19 ].…”

Microstructural evaluation of welded joints of ASTM Mar-M247 superalloy using ERNiCrMo-3 filler alloy

“…The phases of gamma γ and gamma prime γ' of ASTM Mar-M247 alloy can be diagnosed using SEM, as illustrated in Figure 5. The matrix phase γ is the alloy's main phase, which strengthens by the precipitated particles of the gamma prime (Ni 3 Al), thus reducing dislocation movements and increasing the strength at elevated temperatures [31]. In addition, the γ/γ' phase as an unstable phase is present between the interdendritic regions due to the segregation of alloying elements in the alloy through the solidification stage [32].…”