Cast and wrought Ni‐based superalloys are materials of choice for harsh high‐temperature environments aircraft engines gas turbines. Their compositional complexity requires sophisticated thermo‐mechanical processing. A typical microstructure consists a polycrystalline γ ‐matrix, strengthening Ni 3 (Al,Ti) ′ precipitates, carbides (MC, M 6 C, 23 C ), borides (M 2 B, B , 5 other inclusions. Micro...

Background: There is evidence that CD36 promotes foam cell formation through internalizing oxidized LDL (ox-LDL) into macrophages therefore, it plays a key role in pathogenesis of atherosclerosis. In addition, CD36 expression seems to be mediated by nuclear receptor peroxisome proliferator-activated receptor gamma (PPAR-γ). The aim of the present study was to evaluate and compare the effect of ...

The work was devoted to the study of long-term strength and creep resistance recently developed heat resistant nickel-based superalloy SDZhS-15 intended for manufacturing discs gas turbine engines. as-cast alloy subjected homogenization treatment, hot forging at subsolvus temperatures with intermediate annealing, solution treatment various aging or only aging. A predominantly fine-grained struc...

Gamma titanium aluminide (γ-TiAl) is considered a high-performance, low-density replacement for nickel-based superalloys in the aerospace industry due to its high specific strength, which retained at temperatures above 800 °C. However, low damage tolerance, i.e., brittle material behavior with propensity rapid crack propagation, has limited application of γ-TiAl. Any cracks introduced during ma...

A homogenization result is given for a material having brittle inclusions arranged in a periodic structure. According to the relation between the softness parameter and the size of the microstructure, three different limit models are deduced via Γ-convergence. In particular, damage is obtained as limit of periodically distributed microfractures.

This paper is devoted to prove new relaxation and Γ-convergence theorems on BV(Ω) for a class of integral functionals, whose integrands have a product type structure, but they do not satisfy any assumptions of coerciveness or continuity with respect to the spatial variable.

A variational model for the epitaxial deposition of a film on a rigid substrate in the presence of a crystallographic misfit is studied. The scaling behavior of the minimal energy in terms of the volume of the film and the amplitude of the misfit is considered, and reduced models in the various regimes are derived by Γ-convergence methods. Depending on the relation between the thickness of the ...

This paper is devoted to prove a continuity theorem for integral functional defined on BV(Ω). This result is applied in order to obtain new relaxation and Γ-convergence theorems on BV(Ω) without any coerciveness and any continuity assumption of the integrand with respect to the spatial variable.