Effects of ternary additions on Young's modulus and the martensitic transformation of Nb/sub 3/Sn
Recent measurements on bronze-processed Nb/sub 3/Sn using a vibrating reed technique have shown that Young's modulus at low temperatures decreases to 0.4 of its room temperature value, and that the internal friction increases dramatically below 50 K, the martensitic transformation temperature. In this study, this technique was used to study softening and the occurrence of the martensitic transformation in bronze-processed Nb/sub 3/Sn samples which contained additions of Ta, Ti, and Zr. Sample preparations and characteristics of the compositions are given. Internal friction and dynamic Young's modulus were measured using electronics based on a phase-locked loop and frequency mode developed by Simpson and Sosin. Softening of Young's modulus and occurrence of the martensitic transformation were found to be strongly affected by the presence of relatively small amounts (0-4 at .%) of Ta, Ti, or Zr. Additions incorporating 2 at .% Ti in the Nb/sub 3/Sn increased Young's modulus by a factor of 2 at 10 K and also suppressed the transformation.
- Research Organization:
- Institut de Genie des Materiaux, CNRC, Montreal, Quebec
- OSTI ID:
- 6209987
- Report Number(s):
- CONF-810835-
- Journal Information:
- Adv. Cryog. Eng.; (United States), Vol. 28; Conference: 1981 cryogenic engineering conference, San Diego, CA, USA, 10 Aug 1981
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
NIOBIUM ALLOYS
PHASE TRANSFORMATIONS
TERNARY ALLOY SYSTEMS
YOUNG MODULUS
TANTALUM ADDITIONS
METALLURGICAL EFFECTS
TIN ALLOYS
TITANIUM ADDITIONS
ZIRCONIUM ADDITIONS
BRONZE
CRYOGENICS
INTERNAL FRICTION
LOW TEMPERATURE
MARTENSITE
SUPERCONDUCTORS
ALLOY SYSTEMS
ALLOYS
CARBON ADDITIONS
COPPER ALLOYS
COPPER BASE ALLOYS
FRICTION
IRON ALLOYS
MECHANICAL PROPERTIES
TANTALUM ALLOYS
TITANIUM ALLOYS
ZIRCONIUM ALLOYS
360102* - Metals & Alloys- Structure & Phase Studies