Effect of stress reversal of the work hardening behavior of polycrystalline copper

Conference · · TMS (The Metallurgical Society) Paper Selection; (USA)

OSTI ID:5442981

Christodoulou, N; Woo, O T; MacEwen, S R; Mecke, J F ^[1]

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1. Atomic Energy of Canada Limited, Ontario

This paper reports results from experiments on annealed Cu samples that were deformed first in tension and then in compression. Stress reversals were carried out after various amounts of forward strain. The evolution of the microstructure during the reverse flow was investigated directly by TEM, and indirectly through its effect on the work hardening rate {theta}. A comparison of the stress dependence of {theta}{sub r} in the reverse direction with that of {theta}{sub f} in the forward direction shows that the reversal in stress produces large transients in the work hardening rate. The transients can be correlated with dislocation rearrangement during the initial part of reverse flow. TEM reveals that the tangles and loose cell walls that form during forward straining, become unstable and tend to dissolve during reverse flow. However, by the end of the transient the microstructure resembled that existing at the maximum forward flow stress. The degree of rearrangement, and the transient in {theta}, depend on the amount of prestrain.

• OSTI ID: 5442981
• Report Number(s): CONF-840909--
• Conference Information: Journal Name: TMS (The Metallurgical Society) Paper Selection; (USA) Journal Volume: 56
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360102* -- Metals & Alloys-- Structure & Phase Studies
360103 -- Metals & Alloys-- Mechanical Properties
COMPRESSION
COPPER
CORRELATIONS
CRYSTAL DEFECTS
CRYSTAL STRUCTURE
CRYSTAL-PHASE TRANSFORMATIONS
DISLOCATIONS
ELECTRON MICROSCOPY
ELEMENTS
HARDENING
LINE DEFECTS
METALS
MICROSCOPY
MICROSTRUCTURE
PHASE TRANSFORMATIONS
STRAIN HARDENING
STRAINS
STRESSES
TRANSITION ELEMENTS
TRANSMISSION ELECTRON MICROSCOPY