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Creep of silver at C

K C Goretta-+, W E Delaney-+, J L Routbort-+, J Wolfenstine++, W Zhang§ and E E Hellstrom§

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Creep behaviour of polycrystalline silver at C depends primarily on the purity of the Ag. Specimens of 99.999% purity dynamically recrystallized during creep; the stress for recrystallization was MPa. Oxygen partial pressure had no effect on the creep response. For 99.9% Ag, no dynamic recrystallization occurred; instead, steady-state creep was observed, with the rate-controlling deformation occurring primarily by dislocation motion. Long-term annealing of 99.9% Ag in increased the steady-state stress by a factor of . Depending on test conditions, the 99.9% Ag was up to twice as strong as the 99.999% Ag.


PACS

74.25.Ld Mechanical and acoustical properties, elasticity, and ultrasonic attenuation

74.70.Ad Metals; alloys and binary compounds (including A15, MgB2, etc.)

81.40.Ef Cold working, work hardening; annealing, post-deformation annealing, quenching, tempering recovery, and crystallization

Subjects

Superconductivity

Condensed matter: structural, mechanical & thermal

Dates

Issue 5 (May 1996)

Received 31 October 1995, in final form 18 December 1995



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