Features of High-Temperature Synthesis in Clad Mechanocomposites of Ti-Al System

Abstract:

The influence of mechanoactivated reagents cladding on the structural-phase state of the SHS-products was investigated. Titanium and aluminum powders were used as reagents. Mechanical activation was performed on the AGO-2 planetary ball mill. The coating on Ti+Al mechanocomposite was carried out using magnetron installation “VSE-PVD-Power”. At deposition time of 40 minutes, the reaction start temperature increases from 525 °C to 648 °C (compared to reagents without cladding). It can be assumed that an increase in the thickness of the deposited SiO₂ film serves as a barrier to the reaction start, thereby increasing ignition temperature. Apart from pretreatment, the phase composition of the final product contains intermetallic compounds TiAl, TiAl₃, Ti₃Al₅, as well as the small amount of residual Ti. The main phase is TiAl.

• Periodical: Defect and Diffusion Forum (Volume 410)
• Pages: 348-352
• DOI: https://doi.org/10.4028/www.scientific.net/DDF.410.348
• Online since: August 2021
• Authors: Alexey Sobachkin*, Marina V. Loginova, Valery Yu. Filimonov
• Keywords: Cladding, Mechanical Activation, Self-Propagating High-Temperature Synthesis (SHS), Titanium Aluminides

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