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Dynamic Embrittlement Of Beryllium-Strengthened Copper In Air

Published online by Cambridge University Press:  15 February 2011

Ranjani C. Muthiah ,
C. J. McMahon Jr.  and
Amitava Guha
Ranjani C. Muthiah
Affiliation:
Department of Materials Science and Engineering, University of Pennsylvania, Philadelphia, PA 19104, USA
C. J. McMahon Jr.
Affiliation:
Department of Materials Science and Engineering, University of Pennsylvania, Philadelphia, PA 19104, USA
Amitava Guha
Affiliation:
Brush Wellman Inc. 17876 St. Clair Avenue, Cleveland, OH 44110, USA.
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Abstract

A precipitation-hardened Cu-0.26%Be alloy is used as a low-temperature model material for “dynamic embrittlement”, or quasi-static diffusion-controlled intergranular brittle fracture. This alloy is shown to undergo intergranular cracking in air at 150°C and to be almost free of this cracking in 2×10−6 Torr vacuum at 200°C. The time to failure is highly stress dependent. The temperature dependence of cracking was found to be 30 kcal/mole. This is about 50% greater than the activation energy for oxygen diffusion in copper, but the present experiments also include an unknown incubation time.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 409: Symposium Q – Fracture-Instablility Dynamics, scaling and Ductile/Brittle Behavior , 1995 , 189
Copyright
Copyright © Materials Research Society 1996

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