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Article
Compression and Oxidation Testing of Co-Al-W-Ta Single-Crystal Specimens Directionally Solidified with a Flat Front
Single-crystals of Co8.4Al9.4W1.9Ta alloy with macrosegregation of Al and W were directionally solidified with a flat front. Mini-specimens of different composition were cut at different heights of the single-...
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Article
Model for the Pore Formation During Incipient Melting of Single-Crystal Nickel-Based Superalloys
A model for the porosity formation which occurs in single-crystal nickel-based superalloys when the non-equilibrium eutectic melts during high-temperature heat treatment is proposed. It is assumed that the por...
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Article
Determination of the Volume Fraction of Microporosity in Single Crystals of Nickel-Based Superalloys
Microporosity is a dangerous defect observed in single-crystal gas turbine blades cast from nickel-based superalloys (NBSs). The volume fraction of porosity in single-crystal alloys does not exceed several ten...
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Article
Anisotropy of Residual Stress Energy in Two-Component Plate Crystal Structures
An analytical solution for residual stresses and their energy in an elastically anisotropic two-component plate structure, where the components have an identical type of elastic anisotropy, identical or propor...
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Article
Porosity of Nickel Nanopowder Compacts Consolidated by Gas Extrusion
This paper presents a method to calculate the pore gas pressure from the minimum size of a closed pore. The pore pressure assessment is based on materials produced by consolidation of nickel nanopowders using ...
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Article
Open AccessComparison of Isothermal and Adiabatic Elasticity Characteristics of the Single Crystal Nickel-Based Superalloy CMSX-4 in the Temperature Range Between Room Temperature and 1300°C
Based on the results of performed thermophysical measurements and available experimental data for adiabatic elastic stiffnesses, isothermal elastic characteristics of the single crystal nickel-based superalloy...
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Article
Microsegregation of Alloying Elements at Deformation-Induced Stacking Faults in a Powder Metallurgy Nickel-Base Superalloy
Specimens cut from a powder-metallurgy manufactured disk of the Russian nickel-base superalloy VZh178P have been tested for tensile strength at room temperature and creep strength at 750°С. Transmission electr...
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Article
Investigation of High Temperature Homogenization of a Single-Crystal Nickel-Based Superalloy of the Third Generation
High alloy nickel-based superalloys used for casting of single-crystal blades of aircraft gas turbine engines need to be subjected to a long high temperature homogenization annealing for dissolution of nonequi...
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Article
Deformation and Fracture of Single Crystals of Nickel-Base Superalloys CMSX-4 and CMSX-10 under Conditions of Creep and Fatigue Loading
Abstract—Single crystals of superalloys CMSX-4 and CMSX-10 were tested for creep at 750-1100°C and low-cycle fatigue at 700°C. It is shown that the type of creep curves depends on the test temperature. It is foun...
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Article
Influence of the Sign of the γ/γ' Misfit on the Structure and Creep Strength of Single Crystals of Nickel-Based Superalloys
Using the method of directional solidification, single crystals of experimental nickel-based superalloys with negative, zero, and positive γ/γ' misfits are obtained. The γ' solvus, solidus, and liquidus temper...
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Article
Pore Morphology in Single Crystals of a Nickel-Based Superalloy After Hot Isostatic Pressing
The morphology of pores partially shrunk during a half-hour HIP at temperature of 1288 °C and pressure of 103 MPa has been investigated in nickel-based superalloy CMSX-4. The investigation resulted in the foll...
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Article
Influence of the Crystal Structure and Type of Interatomic Bond on the Elastic Properties of Monatomic and Diatomic Cubic Crystals
The dependence of the elastic properties of monatomic (simple substances) and diatomic (AB type compounds) crystals of the cubic syngony on the types of their crystal structure and interatomic bond is analyzed...
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Article
The Synergetic Effect of Rhenium and Ruthenium on the Long-Term Creep Strength of Single Crystals of Third- and Fourth-Generation Nickel-Based Superalloys
Comparative long-term creep tests of [001] single crystals of third-generation rhenium-containing nickel-based superalloy VZhM1 and fourth generation rhenium- and ruthenium-containing nickel-based superalloy V...
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Article
Creep of Directionally Solidified Eutectics Ni/Ni3 Al–NbC under Thermal Cycling
A nickel-based eutectic alloy with a γ/γ '-NbC structure was directionally solidified with a planar front. The specimens were tested for creep under sawtooth thermal cycling in the temperature range from 600 t...
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Article
Experimental Determination of Temperature Dependence of Structural–Phase Parameters of Nickel-Based Superalloy
The temperature dependences of the periods of the crystal lattices of the γ and γ' phases, their dimensional mismatch (misfit), and volume fraction of the γ' phase of an experimental single-crystal high-temper...
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Article
Model for Forecasting Temperature Dependence of γ/γ' Misfit in Heat-Resistant Nickel Alloys
An analytical model for forecasting the temperature dependence of γ/γ' misfit in heat-resistant nickel alloys is proposed. The model accounts for the concentration dependences of the periods of crystalline lat...
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Article
A Vacancy Model of Pore Annihilation During Hot Isostatic Pressing of Single Crystals of Nickel-Base Superalloys
An improved diffusion model of pore annihilation during hot isostatic pressing of single crystals of nickel-base superalloys is proposed. The model considers dissolution of pores by emission of vacancies and t...
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Article
Extreme values of the Poisson’s ratio of cubic crystals
The problem of determining the extrema of Poisson’s ratio for cubic crystals is considered, and analytical expressions are derived to calculate its extreme values. It follows from the obtained solution that, a...
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Article
Thermal stability of the structure of a heat-resistant cobalt alloy hardened with intermetallic γ'-phase precipitates
The thermal stability of the microstructure of a heat-resistant cobalt alloy, which consists of a γ solid solution strengthened with γ'-phase precipitates, has been studied. The temperature behavior of the dis...
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Article
Evolution of pore morphology in single-crystals of nickel-base superalloys
The evolution of the morphology of pores in single crystals of nickel superalloys at high-temperature annealing, creep, and hot isostatic pressing is studied. It is found that, depending on the conditions of g...
