scholarly journals An atomistic study of dislocation interactions with the gama/gama (Ni/Ni3Al)interface of a nickel based single crystal super alloy

2003 ◽  
Author(s):  
Adeyemi Akangbe
Keyword(s):  
Single Crystal ◽  
Dislocation Interactions ◽  
Atomistic Study ◽  
Super Alloy

scholarly journals Erratum to: Laser-Aided Direct Writing of Nickel-Based Single-Crystal Super Alloy (N5)

2017 ◽  
Vol 48 (7) ◽  
pp. 3623-3623
Author(s):  
Yichen Wang ◽  
Jeongyong Choi ◽  
Jyoti Mazumder
Keyword(s):  
Single Crystal ◽  
Direct Writing ◽  
Super Alloy

scholarly journals Development of a High-Efficiency Z-Form Selector for Single Crystal Blades and Corresponding Grain Selection Mechanism

Materials ◽  
2019 ◽  
Vol 12 (5) ◽  
pp. 780 ◽  
Author(s):  
Xintao Zhu ◽  
Fu Wang ◽  
Dexin Ma ◽  
Andreas Bührig-Polaczek
Keyword(s):  
Single Crystal ◽  
High Efficiency ◽  
Geometrical Structure ◽  
Turbine Blades ◽  
Grain Structure ◽  
Two Dimensional ◽  
Coating Properties ◽  
Turbine Engine ◽  
Research Material ◽  
Super Alloy

Single crystal (SX) is widely used in modern turbine blades to improve the creep fracture, fatigue, oxidation, and coating properties of the turbine, so that the turbine engine has excellent performance and durability. In this paper, the single crystal super alloy MM247LC is used as the research material. The evolution of grain structure in a two-dimensional grain selector was studied by directional experiments, and the mechanism of grain selection in the two-dimensional channel during directional solidification was clarified. In order to optimize the production process of single crystal turbine blades, the effects of the geometrical structure of a Z-type separator (i.e., wire diameter and take-off angle) on the crystal orientation, microstructure, and grain efficiency of blades were discussed.

Lattice Thermal Conductivity of Fe-Cr Alloys With 〈001〉 Tilt Boundaries: An Atomistic Study

2014 ◽  
Author(s):  
Ishraq Shabib ◽  
Mohammad Abu-Shams ◽  
Mujibur R. Khan
Keyword(s):  
Thermal Conductivity ◽  
Molecular Dynamics ◽  
Single Crystal ◽  
Grain Boundaries ◽  
Lattice Thermal Conductivity ◽  
The Other ◽  
Tilt Boundaries ◽  
Cr Concentration ◽  
Non Equilibrium Molecular Dynamics ◽  
Atomistic Study

The objective of this study is to examine lattice thermal conductivity (κ) of Fe-Cr alloys containing different 〈001〉 tilt grain boundaries (GBs). The effects of Cr concentration (2 and 10%) and three different 〈001〉 tilt boundaries (Σ5{310}, Σ13{510}, and Σ17{530}) have been examined at 70K using the reverse non-equilibrium molecular dynamics (rNEMD) simulation technique. The results exhibit higher κ for Fe or Fe-Cr models with Σ5[310] GB. The values are 2–4% and 12–16% more than those of models with Σ13[510] and Σ17[530] GBs, respectively. Pure Fe single crystal models exhibit higher conductivities than Fe/Fe-Cr models with various Σ tilt boundaries. κ decreases 7–9% as GBs are introduced into the pure Fe single crystal models. On the other hand, the conductivities of Fe-Cr models are affected more by the Cr concentration than the presence of a particular GB. As 10% Cr is added into the system the conductivity decreases by 7.6–9.4% compared to the pure Fe models.

Laser-Aided Direct Writing of Nickel-Based Single-Crystal Super Alloy (N5)

2016 ◽  
Vol 47 (12) ◽  
pp. 5685-5690 ◽  
Author(s):  
Yichen Wang ◽  
Jeongyoung Choi ◽  
Jyoti Mazumder
Keyword(s):  
Single Crystal ◽  
Direct Writing ◽  
Super Alloy

Dislocation Dynamics Simulations of Dislocation Interactions in Thin Fcc Metal Films

2001 ◽  
Vol 673 ◽  
Author(s):  
Prita Pant ◽  
K.W. Schwarz ◽  
S.P. Baker
Keyword(s):  
Cyclic Loading ◽  
Single Crystal ◽  
Dislocation Structure ◽  
Metal Films ◽  
Dislocation Dynamics ◽  
Threading Dislocation ◽  
Dislocation Interactions ◽  
Oriented Films ◽  
Dynamics Simulations ◽  
Fcc Metal

ABSTRACTMesoscopic simulations of dislocation interactions in thin, single crystal FCC metal films were carried out. Interactions between threading-misfit and threading-threading dislocation pairs were studied and the strength of the interactions determined. Threading-threading interactions were found to be significantly stronger than threading-misfit interactions. Dislocations with different possible combinations of Burgers vectors were studied under cyclic loading. Only annihilation of dislocations was seen to result in residual dislocation structure after complete unloading. No differences were observed in the nature of threading-misfit interactions in 111 and 001 oriented films.

Fatigue Life of Ni-Based Single Crystal Super-Alloy Specimen with Single Hole

2021 ◽  
Vol 891 ◽  
pp. 10-16
Author(s):  
Xiang Zhen Xue ◽  
Zhi Xun Wen ◽  
Wen Xian Li
Keyword(s):  
Fatigue Life ◽  
Single Crystal ◽  
Stress Ratio ◽  
Test Results ◽  
Alloy Specimen ◽  
Paris Law ◽  
Single Hole ◽  
Alloy Material ◽  
Life Model ◽  
Super Alloy

A method of predicting the fatigue life under multiaxis loads based on the Paris law and EIFS was proposed. And the fatigue life under different loading stress and stress ratio were investigated. The results show that when the loading stress increased from 450~800 MPa, the fatigue life decreased from 6762379 to 10056, as well as when the stress ratio increased from 0.1~1, the fatigue life increased from 6762379 to 14932368. It was validated by test eventually. And the fatigue life model presented here agrees well with test results. It is significant to the prediction of turbine of Ni-based single crystal super-alloy material with filming hole.

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