Abstract Thermophysical properties of the γ-TiAl alloy Ti-48Al-2Cr-2Ni in liquid phase were investigated with a containerless electromagnetic processing device on board International Space Station. Containerless is warranted by high liquidus temperature T liq = 1 776 K and dissolution reactivity phase. include surface tension viscosity, density, specific heat capacity electrical resistivity. Th...

In this research, the effect of two process control agent: methanol (liquid state) and stearicacid (solid state) on mechanical alloying process of Ti and Al with equal at%(Ti50Al50) wereinvestigated. Phase transformation at presence of two PCA was: at first, powder mixture wastransformed to a metastable solid solution of Al in Ti lattice (disordered hcp) and then transformed toamorphous phase w...

Thermal explosion mode of combustion synthesis was used to fabricate TiAl-Al2O3 and TiAl-Ti2AlC-Al2O3 composites from elemental powder mixtures of TiO2, Al and C and characterized by XRD and Scanning Electron Microscopy (SEM) coupled with Energy-Dispersive Spectroscopy (EDS). The experimental results showed that thermite reaction of Al with TiO2 caused TiAl-Al2O3 composite formation. By adding ...

In recent years, Zr has emerged as a promising alloying element for intermetallic γ-TiAl based alloys to improve their mechanical properties. The present work focuses on the influence of this microstructure and thermodynamic phase equilibria in ternary Ti-(42-46)Al-(2-4)Zr (at.%) system. Alloying with was found increase amount γ cast material densified by hot-isostatic pressing. Simultaneously,...

Abstract The design freedom in Laser Metal Deposition provided by the absence of a powder bed enables fabrication Functionally Graded Materials through Additive Manufacturing. For first time, two suitable γ-TiAl alloys (TiAl48Cr2Nb2, TiAl45Nb4C) are combined direct and gradual transitions to generate different microstructure morphologies and, consequently, mechanical properties within component...

In situ synthesized TiB2-reinforced TiAl composites usually possess high strength. However, it is very expensive to use B powder to synthesize TiB2 particles. Moreover, the strength enhancement of TiB2/TiAl composite is generally at the cost of plasticity. In this study, in situ dual reinforcement TiB2-Ti2AlC/TiAl composites were fabricated by using B4C powder as the B and C source, which great...

We report on the distribution of micro-alloying elements in a multi-component TiAl-based alloy. The specimen contains 3 at.% Nb, 1.5 at.% Cr, 0.5 at.% Mn, 0.6 at.% (W + Hf + Zr), and 0.2 at.% each of B, C, and O. The distributions of all micro-alloying elements with respect to the heterophase interface between α2 and γ lamellae are analyzed with a three-dimensional atom-probe (3DAP) microscope....