The double effect of grain size on the work hardening behavior of polycrystalline copper

Journal Article · Mon Aug 15 00:00:00 EDT 1994 · Scripta Metallurgica et Materialia; (United States)

DOI:https://doi.org/10.1016/0956-716X(94)90024-8· OSTI ID:7167567

Gracio, J J ^[1]

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1. Univ. de Aveiro (Portugal). Dept. de Engenharia Mecanica

Following the approach by Ashby, one can consider that strain compatibility between adjacent grains of a polycrystal generates geometrical dislocations. These dislocations participated in the strengthening mechanism in conjunction with statistically stored dislocations which are related to the single-crystal behavior. The dislocations of either species are indistinguishable and, as a whole, they may contribute to cell formation. The dislocation structure formed in a polycrystal is then a function of the major or minor intergranular accommodation complexity. At intermediate strain values the accommodation is distributed over the cells leading to a linear relationship between the tensile stress and the inverse of the cell size, whatever the grain size of the tested samples. The aim of the present work is to check that the presence of statistical and geometrical dislocations in the grains, as well as the fact that at the very early stage of plastic deformation the mean free path of dislocations is of the order of the grain size, leads to a double effect of the grain size on the work hardening behavior of polycrystalline copper. Moreover, careful analysis of the mechanical behavior of polycrystalline copper, including the microstructural aspects of plastic deformation, is performed, allowing the understanding of the relationship between the work hardening ratio and the grain size.

• OSTI ID: 7167567
• Journal Information: Scripta Metallurgica et Materialia; (United States), Vol. 31:4; ISSN 0956-716X
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
COPPER
DISLOCATIONS
STRAIN HARDENING
DEFORMATION
EXPERIMENTAL DATA
CRYSTAL DEFECTS
CRYSTAL STRUCTURE
DATA
ELEMENTS
HARDENING
INFORMATION
LINE DEFECTS
METALS
NUMERICAL DATA
TRANSITION ELEMENTS
360102* - Metals & Alloys- Structure & Phase Studies
360103 - Metals & Alloys- Mechanical Properties