Mobile dislocations at the [alpha][sub 2]/[gamma] phase boundaries in intermetallic TiAl/Ti[sub 3]Al-alloys

Journal Article · Tue Jun 01 00:00:00 EDT 1993 · Acta Metallurgica et Materialia; (United States)

DOI:https://doi.org/10.1016/0956-7151(93)90199-3· OSTI ID:6466843

Wunderlich, W; Kremser, T; Frommeyer, G ^[1]

---

1. Max-Planck-Inst. fuer Eisenforschung GmbH, Duesseldorf (Germany)

Ti[sub 3]Al/TiAl interfaces of four titanium-aluminium alloys with and without chromium additions were examined in detail by tilting experiments using conventional transmission electron microscopy (TEM). Careful adjustment of weak beam conditions showed that the TiAl- as well as the Ti[sub 3]Al- phase contain interfacial dislocations which accommodate the lattice misfit between both phases. In the most ductile TiAl47Cr1Si0.2 alloy only one set of (110) interfacial dislocations in the TiAl phase was found. Most of them possess screw character and will leave the interface during plastic deformation. Consequently, this alloy exhibits remarkable ductility at room temperature.

• OSTI ID: 6466843
• Journal Information: Acta Metallurgica et Materialia; (United States), Journal Name: Acta Metallurgica et Materialia; (United States) Vol. 41:6; ISSN 0956-7151; ISSN AMATEB
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360102* -- Metals & Alloys-- Structure & Phase Studies
ALLOYS
ALUMINIUM ALLOYS
CHROMIUM ALLOYS
CRYSTAL DEFECTS
CRYSTAL STRUCTURE
DATA
DISLOCATIONS
DUCTILITY
ELECTRON MICROSCOPY
EXPERIMENTAL DATA
INFORMATION
INTERMETALLIC COMPOUNDS
LATTICE PARAMETERS
LINE DEFECTS
MECHANICAL PROPERTIES
MICROSCOPY
MICROSTRUCTURE
NUMERICAL DATA
PLASTICITY
SILICON ADDITIONS
SILICON ALLOYS
TENSILE PROPERTIES
TITANIUM ALLOYS
TRANSMISSION ELECTRON MICROSCOPY