Two conventionally solidified Al-0.2Ti alloys (with 0.18 and 0.22 at. pct Ti) exhibit no hardening after aging up to 3200 hours at 375 C or 425 C. This is due to the absence of Al3Ti precipitation, as confirmed by electron microscopy and electrical conductivity measurements. By contrast, an Al-0.2Zr alloy (with 0.19 at. pct Zr) displays strong age hardening at both temperatures due to precipita...

The lattice coherency and critical radii for Al3X precipitates in an aluminum matrix were computed using firstprinciples methods. From density functional perturbation theory and the quasi-harmonic approximation, the unit cell parameters as a function of temperature were determined for Al3Sc, Al3Zr, Al3Ti, and Al3Nb in the L12 structure, and for Al3Ti and Al3Nb in their more stable DO22 structur...

A new method, powder thixoforming, has been proposed to fabricate an in situ Al3Tip/2024Al composite. During partial remelting, the microstructural evolution of the bulk alloy prepared by cold pressing of the Ti, Al, 2024Al powder mixture was investigated, and the formation mechanism of the Al3Ti particles produced by the reaction between the Ti powder and the Al alloy melt is also discussed in...

Light-weight Al-Ti nanocomposites attract increasing attention due to the advancements in spacecraft and additive manufacturing. In this work, ab initio modeling, DSC, in-situ XRD experiments were used formulate a strategy for rapid fabrication of Al-Al3Ti with enhanced mechanical properties (ultimate tensile strength up 437 MPa at room temperature 109 500 °С, ~6% elongation before failure), re...

The thermodynamic and mechanical stabilities of the Al3Ti-Zn3Ti pseudobinary alloy system is investigated from first-principles through density-functional theory calculations within the generalized gradient approximation. Both supercells calculations and sublattice cluster expansion methods are used to demonstrate that the addition of Zn to the Al sublattice of Al3Ti stabilizes the cubic L12 st...

Aluminum is commonly used as fuel additive for propellants, incendiaries, and explosives. The main limitation to its use lies in comparatively slow ignition and oxidation/combustion kinetics. Performance can be significantly improved if pure aluminum is substituted by thermodynamically less stable alloys. In this context, mechanical alloys in the aluminum-rich section of the Al-Ti binary system...

On the basis of ab initio density-functional calculations we have analyzed the character of the interatomic bonding in the intermetallic compounds Al3sV,Tid with the D022 and L12 structures. In all structures we found an enhanced charge density along the AlsV,Tid bonds, a characteristic feature of covalent bonding. The bonds in Al3V with the D022 structure are more saturated and stronger than t...

in this study, gtaw process and cored wires were used to coat al/al3ti wear resistant composite on a commercial pure al substrate. wire drawing process was utilized to produce the cored wires from aluminum strips and a mixture of titanium and aluminum powders. the microstructures and the present phases were investigated by metallographic, sem equipped with eds and xrd analysis. moreover, the ha...