The microstructure of binary Al3Sc and ternary Al3(Sc1−yXy), where X is one of the transition metals from Group IIIA (Y), IVA (Ti, Zr or Hf) or VA (V, Nb or Ta), was investigated as a function of alloying element concentration for 0.1 y 0.75. Alloys with Group IIIA and IVA additions exhibited a single L12 solid-solution phase with some Kirkendall porosity. At the highest concentration studied, ...

Microstructure, mechanical properties, wear resistance, corrosion and corrosive resistance of AlCrFeNiWx (x = 0, 0.1, 0.2, 0.3 0.4) medium-entropy alloys (MEAs) prepared by vacuum arc melting process were investigated. Results the study show that microstructure as-cast is composed one disordered Fe-Cr rich BCC phase (A2) ordered NiAl-rich (B2) when x 0 0.1; W particles appear ≥ 0.2. Hardness st...

The paper focuses on the strength and toughness of joints produced by transient liquid phase (TLP) bonding in the Cu–Sn system. It is motivated by potential applications of TLP bonding in attachment of high-temperature wide bandgap devices to ceramic substrates. Model test specimens suitable for mechanical testing are developed, utilizing substrates of oxide dispersion strengthened copper. Thre...

A multiscale formulation is derived for the mechanics of a dilute fiber network microstructure, as occurs in in vitro reconstituted collagen gels, to accommodate the deterministic solution of a uniform-stress condition in the fiber network. The macroscale two-phase equations are derived based on the integral volume-averaging approach of the spatial averaging theorem, modified for the averaging ...

The microstructure of ternary Al3(Sc1-yREy) intermetallic compounds (where RE is one of the rare-earth elements La, Ce, Nd, Sm, Eu, Yb or Lu), was investigated as a function of RE concentration for 0<y≤0.75. Alloys with La, Ce, Nd, Sm or Eu additions consist of a L12 phase containing a dendritic second phase with D019 (La, Ce, Nd, Sm) or C11b (Eu) structure. Alloys with Yb or Lu additions show ...

The relationships between microstructure and strength were studied at room temperature and 300 °C in an Al–2 wt% Mg–0.2 wt% Sc alloy, containing Mg in solid-solution and Al3Sc (L12 structure) as nanosize precipitates. At room temperature, the yield strength is controlled by the superposition of solid-solution and precipitation strengthening. At 300 °C and at large applied stresses, the creep st...

Initial powder mixtures of Cu, Fe and Co are exposed to severe plastic deformation by high-pressure torsion prepare solid solutions. A broad range compositions is investigated, whereas this study aims at the synthesis soft magnetic materials therefore formation a homogeneous nanocrystalline microstructure. For intermediate ferromagnetic contents, room temperature yields single-phase supersatura...

Thin film Ni-Cu diffusion couples (individual layer thicknesses: 50 nm) were prepared by direct-current magnetron sputtering on silicon substrates. Interdiffusion and solid-solution formation, the associated changes of microstructure and the evolution of mechanical stresses of the Ni-Cu diffusion couples during thermal treatments were investigated employing ex-situ X-ray diffraction phase and t...

h this paper, we use a generalized Fourier series to approximate the solution of a boundary value problem describing the torsion of an elliptic micropolar beam. We provide an example demonstrating the effect of material microstructure. @ 2004 Elsevier Ltd. All rights reserved. Keywords-Linear micropolar elasticity, Generalized Fourier series, Torsion, Material microstructure.

In this paper, the existence of a solution in the form of a minimizer or microstructure is established for the boundary value problems of nonlinear elasticity with certain nonconvex stored energy functions such as those of St. Venant-Kirchhoff type materials. Necessary and sufficient conditions for minimizing sequences of the potential energy to converge to a minimizer or to microstructure are ...