Microstructural rejuvenation in a Ni-based single crystal superalloy

Yao, Xiaoping; Ding, Qingqing; Zhao, Xinbao; Wei, Xiao; Wang, J.; Zhang, Z.; Bei, Hongbin

doi:10.1016/j.mtnano.2021.100152

Cited by 10 publications

(2 citation statements)

References 22 publications

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“…Therefore, the use of nanosingle crystal has become the first choice of high-temperature materials. Nickel-based single-crystal metals have excellent properties and are widely used in the aerospace, the turbine blade industry, and high-temperature vessels. − In single-crystal nickel-based metal materials, due to the removal of grain boundary interference, all parts of the crystal have the same macroscopic properties, and dislocation-oriented sliding has become the main deformation mode of nickel-based single-crystal metal materials.…”

Section: Introductionmentioning

confidence: 99%

Effect of Loading Method, Temperature, and Twin Defects on the Mechanical Behavior of Nanocrystalline Ni with Gradient Spacing Twin Structure

Zhang

Guo

Ren

et al. 2023

Crystal Growth & Design

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We study the mechanical behavior of gradient spacing twin-structured single-crystal Ni nanopillars under the conditions of different loading methods, temperatures, and twin defects via molecular dynamics simulations. The insights indicate that the yield strength and Young’s modulus of single-crystal Ni nanopillars are greatly improved when loading along the gradient direction, which is due to the nucleation of many dislocations induced by Thompson tetrahedrons. In addition, with the temperature increases, the atomic energy in the nanocrystals and the number of disordered atoms increases, resulting in difficulty in the nucleation of dislocations and decrease in mechanical properties. In addition, the presence of void in the twin boundary leads to a decrease in the mechanical properties of nanocrystalline Ni. The position of the void has relatively little impact on the mechanical properties. However, when the void occurs in a twin boundary with a large spacing, the formation of dislocations is suppressed, mainly reflected in the fact that the initial dislocation density of the volume decreases as the twin spacing increases. These findings provide positive theoretical guidance for the design of gradient twin structures in nanosingle crystals.

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Section: Introductionmentioning

confidence: 99%

Effect of Loading Method, Temperature, and Twin Defects on the Mechanical Behavior of Nanocrystalline Ni with Gradient Spacing Twin Structure

Zhang

Guo

Ren

et al. 2023

Crystal Growth & Design

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“…Ni-based SX superalloys are widely employed in turbine blades of aero engines because of their unique combination of mechanical properties and corrosion resistance at high temperatures [1][2][3][4]. Developing aero engines with high strength/weight ratio, improved temperature capacity, and reduced specific weight are still major research directions for the development of Ni-based SX superalloys [5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Microstructure, Mechanical Properties and Thermal Stability of Ni-Based Single Crystal Superalloys with Low Specific Weight

et al. 2023

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Ni-based single crystal (SX) superalloy with low specific weight is vital for developing aero engines with a high strength-to-weight ratio. Based on an alloy system with 3 wt.% Re but without W, namely Ni-Co-Cr-Mo-Ta-Re-Al-Ti, a specific weight below 8.4 g/cm3 has been achieved. To reveal the relationship among the composition, mechanical properties, and thermal stability of Ni-based SX superalloys, SXs with desirable microstructures are fabricated. Tensile tests revealed that the SX alloys have comparable strength to commercial second-generation SX CMSX-4 (3 wt.% Re and 6 wt.% W) and Rene′ N5 alloys (3 wt.% Re and 5 wt.% W) above 800 °C. Moreover, the elongation to fracture (EF) below 850 °C (>20%) is better than that of those two commercial SX superalloys. During thermal exposure at 1050 °C for up to 500 h, the topological close-packed (TCP) phase does not appear, indicating excellent phase stability. Decreasing Al concentration increases the resistance of γ′ rafting and replacing 1 wt.% Ti with 3 wt.% Ta is beneficial to the stability of the shape and size of γ′ phase during thermal exposure. The current work might provide scientific insights for developing Ni-based SX superalloys with low specific weight.

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Effect of Rejuvenation Treatment on SX Ni-Based Superalloys Subjected to Low Cycle Fatigue

Lopez-Galilea,

Dennstedt,

Weber

et al. 2024

The Minerals, Metals &Amp; Materials Series

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Microstructural rejuvenation in a Ni-based single crystal superalloy

Cited by 10 publications

References 22 publications

Effect of Loading Method, Temperature, and Twin Defects on the Mechanical Behavior of Nanocrystalline Ni with Gradient Spacing Twin Structure

Effect of Loading Method, Temperature, and Twin Defects on the Mechanical Behavior of Nanocrystalline Ni with Gradient Spacing Twin Structure

Microstructure, Mechanical Properties and Thermal Stability of Ni-Based Single Crystal Superalloys with Low Specific Weight

Effect of Rejuvenation Treatment on SX Ni-Based Superalloys Subjected to Low Cycle Fatigue

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