Superplasticity of Ti-6Al-4V and iron-modified Ti-6Al-4V. (Volumes I and II)

Thesis/Dissertation · Tue Jan 01 04:00:00 EST 1991

OSTI ID:5404645

Meier, M L

The superplasticity of Ti-6Al-4V and five compositions of iron-modified Ti-6Al-4V was characterized in terms of its sensitivity to strain rate, grain size and temperature, and volume fraction of phases. An initial study of Ti-6Al-4V indicated that the volume fraction of phases might be a significant factor in much of this alloy's uncharacteristic superplastic behavior. The investigation of the iron-modified alloys showed that by considering the average diffusivity (estimated from tracer diffusivities and the actual composition of the softer {beta}-phase) it was possible to account for much of the effect that iron has on the superplasticity of Ti-6Al-4V. The results also revealed a significant volume-fraction dependence, which was in agreement with Chen's model for a power-law dependence between strain rate and volume fraction of the soft phase. Within this volume-fraction dependence, results also indicated that the transition from a behavior characterized by hard particles in a soft phase to that of soft particles in a hard phase was partially a function of the properties of the soft phase.

• Research Organization: California Univ., Davis, CA (United States)
• OSTI ID: 5404645
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360102 -- Metals & Alloys-- Structure & Phase Studies
360103* -- Metals & Alloys-- Mechanical Properties
ALLOYS
ALUMINIUM ALLOYS
CRYSTAL STRUCTURE
ELEMENTS
GRAIN SIZE
IRON
MECHANICAL PROPERTIES
METALLURGICAL EFFECTS
METALS
MICROSTRUCTURE
PHASE STUDIES
PLASTICITY
SIZE
STRAIN RATE
TITANIUM ALLOYS
TITANIUM BASE ALLOYS
TRANSITION ELEMENTS
VANADIUM ALLOYS