Structural and Phase Mechanism and Rate of Interaction between TiCu, Ti3Cu4 and Ti2Cu3 Intermetallic Compounds and Hydrogen. I. Formation and Decomposition of Intermetallic Hydrides

O.Kucheryavyi,
 
T.Bratanich,
 
T.Bratanich,
 
V.Skorokhod,
   

I. M. Frantsevich Institute for Problems of Materials Science of the NAS of Ukraine, Krzhizhanovsky str., 3, Kyiv, 03142, Ukraine
Powder Metallurgy - Kiev: Frantsevich Institute for Problems of Materials Science NASU, 2012, #03/04
http://www.materials.kiev.ua/article/1018

Abstract

The paper examines the phase mechanism and rates of TiCu, Ti3Cu4, and Ti2Cu3 interaction with hydrogen in the range 298–573 K under hydrogen pressure of 1.0 MPa. The thermodynamic possibility of TiCu direct and destructive hydrogenation and TiCu decomposition is established. The thermodynamic priority of destructive hydrogenation in the range 298–773 K is revealed. However, XRD shows that only direct hydrogenation of TiCu, Ti3Cu4, and Ti2Cu3 proceeds in the range 298–373 K. The intermetallic compounds successively interact at 573 K with hydrogen through the formation of intermetallic hydrides (TiCuH1,19, Ti3Cu4H2,44, Ti2Cu3H1,32) and their decomposition to titanium and copper hydrides. The rate of formation of these hydrides is higher than the rate of their decomposition. It is established that mechanical destruction of the material occurs during direct hydrogenation.


DIRECT HYDROGENATION, INTERMETALLIC HYDRIDES, PHASE MECHANISM, TICU, TI3CU4, TI2CU3