Fine Structure of Interphase Boundaries in Hard Alloys
of the Chromium Carbide–Titanium System
A. V. Krokhaleva, *, V. O. Kharlamova, **, S. V. Kuz’mina, ***,
V. I. Lysaka, ****, and B. A. Grinbergb, *****
Translated by N. Korovin
aVolgograd State Technical University, pr. Lenina 28, Volgograd, 400005 Russia
bInstitute of Metal Physics, Ural Branch, Russian Academy of Sciences,
ul. S. Kovalevskoi 18, Yekaterinbug, 620090 Russia
Correspondence to: *e-mail: kroch@vstu.ru
Correspondence to: **e-mail: harlamov_vo@mail.ru
Correspondence to: ***e-mail: weld@vstu.ru
Correspondence to: ****e-mail: lysak@vstu.ru
Correspondence to: *****e-mail: bella@imp.uran.ru
Received 27 March, 2014
Abstract—The structure of interphase boundaries in hard alloys fabricated by the explosive compacting of the powder mixtures of chromium carbide (Cr3C2) and titanium is investigated. It is established by electron microscopy that similar boundaries have thicknesses of about 100 nm, over the extension of which a smooth variation in chromium and titanium contents is observed at the almost identical carbon concentration. The boundary structure is nonuniform over the thickness, notably, a layer with a thickness of 5–7 nm and an amorphous structure is revealed between two crystalline interlayers. It is shown that the revealed layers are the layers of specific “boundary phases” not corresponding to any phase of the equilibrium phase diagram of the Cr–C–Ti system.
Keywords: chromium carbide, titanium, hard alloy, explosive compacting of powders, consolidation of the powder material, interphase surfaces, boundary phase
DOI: 10.3103/S1067821216050096