Mechanical alloying of the Al–Ti system

Metastable Metallic Alloys

“…Milling with higher mechanical impact energy (in a spex mill) induced a SHS reaction (combustion) in the Ti±C system too. An XRD study of amorphization in mechanically alloyed Ti±Al powders [67] was complemented by thermodynamic models, taking into account the dependence on T of properties of the undercooled liquid.…”

Thermodynamics and the Glass Forming Ability of Alloys

“…Battezzati and co-workers have shown that in the Cu-Ti system the contribution of the excess specific heat is essential for describing the glass forming ability. An excess specific heat contribution has also been considered in the Al-Ti system (Cocco, et al, 1990) and the Fe-B system (Palumbo, et al, 2001 (Miedema et al, 1975) and liquid (Boom et al, 1976). This model involves the calculations of the formation enthalpy of metallic glasses (amorphous phase) (H amor ), solid solutions (H SS ), and intermetallic compounds (H inter ) according to the following equations (Bakker 1988;Boer et al 1988 Friedel, 1954) and Eshelby (Eshelby, 1954(Eshelby, & 1956 (Niessen, et al, 1983 …”

Preparation and Evaluation of Ordinary Attritor Milled Ti-Al Powders and Corresponding Thermal Sprayed Coatings

“…5) However, some researchers reported that a phase with fcc structure (TiN) might be formed while the milling was conducted under Ar atmosphere, due to the ineffective seal of the milling tools. [6][7][8][9] Additionally, TiC (fcc structure) was also obtained due to the decomposition of PCA's during mechanochemical synthesis of elemental Ti and Al powder mixture. 10,11) It is obvious now that nitride and carbide contamination phases are easily formed due to the inherent nature of Ti as a reactive metal.…”

“…[4][5][6][7][8][9][10][11] The effect of the milling parameters such as milling tools, different milling atmosphere, different combination of powders and the addition of different process control agent (PCA's), was widely investigated. Most of the results show that amorphization should be accomplished after long time milling under Ar atmosphere, which is in good accordance with the theoretical calculation.…”