Structure and Properties of MASHS Titanium Aluminide-Based Powder Alloyed with Chromium

摘要

Structure and properties of MASHS powder Ti-46Al-8Cr, at. %, have been investigated. The powder is characterized by the multiphase dispersed strengthened structure with coherent precipitates/matrix bonding. Main structural constituents of the powder are titanium aluminides alloyed with chromium: γ-TiAl(Cr), Al_(0.67)Cr_(0.08)Ti_(0.25) and α_2-Ti_3Al(Cr). Average powder microhardness is 313 H_(V0.25). High-quality detonation coatings with high hardness (940-1100 H_V) and low porosity (less than 1%) have been obtained from the synthesized powder. The coatings exhibit good oxidation behaviour at 900°C.