Evolution of a martensitic structure in a Cu–Al alloy during processing by high-pressure torsion

A Cu-11.8 wt% Al alloy was quenched in iced water from a high temperature (850 °C) to introduce a martensitic phase and then the alloy was processed using quasi-constrained high-pressure torsion (HPT). The micro-hardness and the microstructures of the unprocessed and severely deformed materials were...

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Bibliographic Details
Published in:Journal of materials science 2013-07, Vol.48 (13), p.4613-4619
Main Authors: Zhang, G. F., Sauvage, X., Wang, J. T., Gao, N., Langdon, T. G.
Format: Article
Language:English
Subjects:
Alloys
Aluminum base alloys
BOUNDARIES
Characterization and Evaluation of Materials
Chemistry and Materials Science
Classical Mechanics
Copper
COPPER ALLOYS (40 TO 99.3 CU)
COPPER ALUMINUM ALLOYS
Copper base alloys
Crystallography and Scattering Methods
DEFORMATION
DENSITY
Diffraction
Dislocation density
Dislocation pinning
Dislocations
Heat treating
High density
High temperature
MARTENSITE
Martensitic transformations
Materials Science
Microhardness
Microscopy
MICROSTRUCTURES
Nanostructure
Nanostructured Materials
Optical microscopy
Polymer Sciences
Scanning electron microscopy
Solid Mechanics
Strong interactions (field theory)
Torsion
Transmission electron microscopy
TWIN BOUNDARIES
Twinning (Crystallography)
Twins
X-rays
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Summary:A Cu-11.8 wt% Al alloy was quenched in iced water from a high temperature (850 °C) to introduce a martensitic phase and then the alloy was processed using quasi-constrained high-pressure torsion (HPT). The micro-hardness and the microstructures of the unprocessed and severely deformed materials were investigated using a wide range of experimental techniques (X-ray diffraction, optical microscopy, scanning electron microscopy, transmission electron microscopy, and high- resolution TEM). During HPT, a stress-induced martensite–martensite transformation occurs and an martensite phase is formed. In the deformed material, there are nanoscale deformation bands having high densities of defects and twins in the martensite. It was observed that a high density of dislocations became pinned and accumulated in the vicinity of twin boundaries, thereby demonstrating a strong interaction between twin boundaries and dislocations during the HPT process.
ISSN:0022-2461
1573-4803
DOI:10.1007/s10853-013-7153-8