Effect of the Zener–Hollomon parameter on the microstructures and mechanical properties of Cu subjected to plastic deformation

Pure Cu was deformed at different strain rates and temperatures, i.e. with different Zener–Hollomon parameters ( Z) ranging within ln Z = 22–66, to investigate the effect of Z on its microstructures and mechanical properties. It was found that deformation twinning occurs when ln Z exceeds 30, and th...

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Bibliographic Details
Published in:Acta materialia 2009-02, Vol.57 (3), p.761-772
Main Authors: Li, Y.S., Zhang, Y., Tao, N.R., Lu, K.
Format: Article
Language:English
Subjects:
Applied sciences
Copper
Deformation
Exact sciences and technology
Grain refinement
Mechanical properties
Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology
Metals. Metallurgy
Microstructure
Nanocomposites
Nanoscale deformation twinning
Nanostructure
Nanostructures
Plastic deformation
Twinning
Zener–Hollomon parameter
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Summary:Pure Cu was deformed at different strain rates and temperatures, i.e. with different Zener–Hollomon parameters ( Z) ranging within ln Z = 22–66, to investigate the effect of Z on its microstructures and mechanical properties. It was found that deformation twinning occurs when ln Z exceeds 30, and the number of twins increases at higher Z. The average twin/matrix lamellar thickness is independent of Z, being around 50 nm. Deformation-induced grain refinement is enhanced at higher Z, and the mean transverse grain size drops from 320 to 66 nm when ln Z increases from 22 to 66. The grain refinement is dominated by dislocation activities in low- Z processes, while deformation twinning plays a dominant role in high- Z deformation. An obvious increment in yield strength from 390 to 610 MPa was found in deformed Cu with increasing Z, owing to the significant grain refinement as well as the strengthening from nanoscale deformation twins.
ISSN:1359-6454
1873-2453
DOI:10.1016/j.actamat.2008.10.021