Effect of hydrogen on superplastic deformation of beta-titanium alloys

Conference · Sat Dec 30 23:00:00 EST 1995

OSTI ID:194191

Zhang, H ^[1]; Lin, T; Xu, J ^[2]; Wang, S ^[3]

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1. Univ. of Cincinnati, OH (United States). Dept. of Materials Science and Engineering
2. Shanghai Iron and Steel Research Inst. (China)
3. Beijing Univ. of Aeronautics and Astronautics (China). Dept. of Materials Science and Engineering

The effect of hydrogen on superplastic deformation of two commercial {beta} titanium alloys, Ti-4Al-7Mo-10V-2Fe-1Zr (Ti-471021) and Ti-10V-2Fe-3Al (Ti-1023), was studied in the range of hydrogen concentration up to 1.3 wt%. The stress levels during the superplastic deformation in both alloys increased with increasing concentrations of hydrogen in {beta} phase region. X-ray diffraction results and examination of the microstructure with TEM revealed that no hydrides had formed up to hydrogen concentrations of 1.3 wt%. The microstructural examination with TEM revealed that the {beta} grains of the samples became much finer after superplastic deformation. A larger amount of subgrains were formed. The increase in flow stress was due to the solid solution strengthening by hydrogen and the interaction between hydrogen and grain boundaries during the superplastic deformation.

• OSTI ID: 194191
• Report Number(s): CONF-950201--; ISBN 0-87339-300-7
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM ALLOYS
CHEMICAL COMPOSITION
ELONGATION
FLOW STRESS
GRAIN SIZE
HARDNESS
HYDROGEN
IRON ALLOYS
MECHANICAL PROPERTIES
METALLURGICAL EFFECTS
MICROSTRUCTURE
MOLYBDENUM ALLOYS
OPTICAL MICROSCOPY
PLASTICITY
TENSILE PROPERTIES
TITANIUM BASE ALLOYS
TRANSMISSION ELECTRON MICROSCOPY
VANADIUM ALLOYS
X-RAY DIFFRACTION
ZIRCONIUM ALLOYS