Effect of hydrogen on internal friction of several Ti alloys. Technical report
A resonant bar apparatus employing a three-component piezoelectric composite oscillator system was used to make internal friction and modulus measurements in several titanium alloys in the range of 80 to 400/sup 0/K. Emphasis was placed on the alpha plus beta alloy, Ti-6Al-4V, but the study also included pure Ti, Ti-Al alloys (1, 3 and 10 at.%), Ti-6Al-6V-2Sn, Ti-8Al-1Mo-1V and Ti-17.5Mo alloys. The effect of hydrogen impurities on internal friction was investigated, and a Snoek-type relaxation peak was observed in beta-containing alloys. In the case of Ti-6Al-4V, the peak was found at 144/sup 0/K in the kilohertz frequency range with a relaxation strength of 0.0035/at.% hydrogen. The peak was absent in pure Ti, Ti-Al alloys or quenched Ti-6Al-4V alloy, indicating the need of bcc lattice. The peak was also observed using 10MHz pulse-echo internal friction measurements at 195/sup 0/K. (GRA)
- Research Organization:
- California Univ., Los Angeles (USA). Dept. of Materials
- OSTI ID:
- 7348076
- Report Number(s):
- AD-A-015546
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360103* -- Metals & Alloys-- Mechanical Properties
ALLOYS
ALUMINIUM ALLOYS
CRYOGENIC FLUIDS
ELEMENTS
FLUIDS
FRICTION
HIGH TEMPERATURE
HYDROGEN
IMPURITIES
INTERNAL FRICTION
LOW TEMPERATURE
MEDIUM TEMPERATURE
MOLYBDENUM ALLOYS
NONMETALS
RELAXATION
TIN ALLOYS
TITANIUM ALLOYS
TITANIUM BASE ALLOYS
VANADIUM ALLOYS