Internal friction due to domain-wall motion in martensitically transformed A15 compounds

Conference · Tue Jan 01 00:00:00 EST 1985

OSTI ID:5276252

Snead, Jr, C L; Welch, D O

A lattice instability in A15 materials in some cases leads to a cubic-to-tetragonal martensitic transformation at low temperatures. The transformed material orients in lamellae with c axes alternately aligned along the <100> directions producing domain walls between the lamellae. An internal-friction (delta) feature below T/sub m/ is attributed to stress-induced domain-wall motion. The magnitude of the friction increases as temperature is lowered below T/sub m/ as (1-c/a) increases, and behaves as (1-c/a)/sup 2/ from T/sub m/ down to the superconducting critical temperature where the increasing tetragonality is inhibited. The effect of strain in the lattice is to decrease the domain-wall internal friction, but not affect T/sub m/. Neutron-induced disorder and the addition of some third-elements in alloying decrease both delta and T/sub m/, with some elements reducing only the former. Less than 1 at. % H is seen to completely suppress both delta and T/sub m. Martensitically transformed V/sub 2/Zr demonstrates low-temperature internal-friction and modulus behavior consists with easy ..beta../m wall motion relative to the easy m/m motion of the A15's. For the V/sub 2/Zr, a peak in delta is observed, qualitatively in agreement with expected ..beta../m wall motion.

• Research Organization: Brookhaven National Lab., Upton, NY (USA)
• DOE Contract Number: AC02-76CH00016
• OSTI ID: 5276252
• Report Number(s): BNL-36833; CONF-8506125-8; ON: DE85017510
• Resource Relation: Conference: Conference on internal friction and ultrasonic attenuation in solids, Urbana, IL, USA, 3 Jun 1985; Other Information: Portions of this document are illegible in microfiche products
• Country of Publication: United States
• Language: English

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36 MATERIALS SCIENCE
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PHASE TRANSFORMATIONS
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TIN ALLOYS
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INTERMETALLIC COMPOUNDS
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SUPERCONDUCTIVITY
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