Dislocation network with pair-coupling structure in {111} γ/γ′ interface of Ni-based single crystal superalloy

Dislocation network with pair-coupling structure in {111} γ/γ′ interface of Ni-based single crystal superalloy

The γ/γ' interface dislocation network is reported to improve the high temperature creep resistance of single crystal superalloys and is usually found to deposit in {001} interface. In this work, a new type of dislocation network was found in {111} γ/γ' interface at a single crystal model superalloy crept at 1100 °C/100 MPa. The dislocations in the network are screw with Burgers vectors of 1/2 ...

Tem-studies of the dislocation structure in a γ/γ’ Ni-based superalloy

Evaluating the Effect of Ta/W Ratio on Microstructure and Stress Rupture Properties of Ni-Based Single Crystal Superalloy PWA1483

In this study, the effect of Ta/W ratio on the microstructure and stress rupture properties of Ni-based single crystal (SX) superalloy PWA1483 was investigated. For this purpose, single crystal (SX) superalloys with different Ta/W ratios (0.75, 1.0, 1.32 and 1.5 in wt.%) were fabricated. The alloys were directionally solidified by Bridgman method under the same solidification condition at withd...

In- and Out-of Phase Thermomechanical Fatigue of a Ni-Based Single-Crystal Superalloy

In this study, the difference between in-phase (IP) and out-of-phase (OP) thermomechanical fatigue (TMF) cycling from 100 to 750 ◦C has been investigated for the Ni-based single-crystal superalloy MD2. In addition, two different crystal orientations were studied, the 〈001〉 and 〈011〉 orientations respectively. When comparing IP and OP TMF lives, a strain range dependency is found for the 〈001〉 d...

Modelling plastic deformation in a single-crystal nickel-based superalloy using discrete dislocation dynamics

Background: Nickel-based superalloys are usually exposed to high static or cyclic loads in non-ambient environment, so a reliable prediction of their mechanical properties, especially plastic deformation, at elevated temperature is essential for improved damage-tolerance assessment of components. Methods: In this paper, plastic deformation in a single-crystal nickel-based superalloy CMSX4 at el...