Deformation mechanisms within the B2, L1{sub 0} and DO{sub 19} structures of a Ti-44Al-2Mo alloy

Book · Sat Dec 30 23:00:00 EST 1995

OSTI ID:225108

Morris, M A ^[1]; Li, Y G ^[2]

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1. Univ. of Neuchatel (Switzerland). Inst. of Structural Metallurgy
2. Univ. of Birmingham (United Kingdom). Interdisciplinary Research Centre

The strength and ductility of a Ti-44Al-2Mo alloy have been interpreted in terms of the active deformation mechanisms analyzed within the three ordered phases present. The DO{sub 19} phase shows very low dislocation activity and always consists of {l_angle}11{bar 2}0{r_angle}{l_brace}0001{r_brace} while the L1{sub 0} structure is characterized by large densities of ordinary 1/2{l_angle}110{r_angle} dislocations and deformation twins and only few superdislocations. The B2 phase has been confirmed to deform both by {l_angle}100{r_angle} and dissociated {l_angle}111{r_angle} superdislocations on {l_brace}110{r_brace} planes. The {l_angle}100{r_angle}[110] system is always seen as pile-ups producing planar slip due to the presence of a fine {omega} type precipitation.

• OSTI ID: 225108
• Report Number(s): CONF-950201--; ISBN 0-87339-304-X
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM ALLOYS
BURGERS VECTOR
CHEMICAL ANALYSIS
COMPRESSION STRENGTH
DISLOCATIONS
EXPERIMENTAL DATA
FLOW STRESS
INTERMETALLIC COMPOUNDS
LAMELLAE
MECHANICAL PROPERTIES
MICROHARDNESS
MICROSTRUCTURE
MOLYBDENUM ALLOYS
PRECIPITATION
SCANNING ELECTRON MICROSCOPY
SLIP
TENSILE PROPERTIES
TITANIUM ALLOYS
TRANSMISSION ELECTRON MICROSCOPY
X-RAY DIFFRACTION