DIFFUSION COARSENING OF THE LAMELLAR STRUCTURE IN 2-PHASE TI-47.5 AT-PERCENT AL INTERMETALLIC ALLOY

Authors
KARDASHOVA SI LOZOVOI AY RAZUMOVSKII IM
Citation
Si. Kardashova et al., DIFFUSION COARSENING OF THE LAMELLAR STRUCTURE IN 2-PHASE TI-47.5 AT-PERCENT AL INTERMETALLIC ALLOY, Acta metallurgica et materialia, 42(10), 1994, pp. 3341-3348
Citations number
16
Categorie Soggetti
Material Science","Metallurgy & Mining
Journal title
Acta metallurgica et materialia → ACNP
ISSN journal
09567151
Volume
42
Issue
10
Year of publication
1994
Pages
3341 - 3348
Database
ISI
SICI code
0956-7151(1994)42:10<3341:DCOTLS>2.0.ZU;2-S
Abstract
Diffusion coarsening of the lamellar structure in two-phase gamma-alph a2 intermetallic Ti-47.5 at.% Al alloy is treated as caused by hole-li ke macro-defects growth. A model of unlimited diffusion-controlled gro wth of such defects and an approach to the experimental data processin g are considered. Based on this model, experimental investigations of coarsening kinetics have been carried out in Ti-Al alloy in the temper ature range 1073-1373 K. The low value of the activation enthalpy Q(m) = 63.8 kJmol-1 has been found. The stability of the gamma-alpha2 lame llar structure in the studied Ti-Al intermetallic alloy is compared wi th the stability of the gamma-gamma' raft structure in Ni-base superal loy single crystals.