Abstract
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 \( \alpha^{\prime}_{1} \) martensite phase is formed. In the deformed material, there are nanoscale deformation bands having high densities of defects and twins in the \( \alpha^{\prime}_{1} \) 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.
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Acknowledgements
This study was supported by the Ministry of Science and Technology of China under Grant No. 2012CB932203 of the National Key Basic Research Program and by the Royal Society of the UK under International Joint Project No. JP871294. GFZ is grateful to the Xu Guangqi program 2009 and the 3rd scholarship program of NUST for providing an opportunity to study in the University of Rouen, Groupe de Physique des Matériaux, CNRS (UMR 6634), supervised by Dr. Xavier Sauvage for 6 months. Thanks are due to Chuanting Wang for HPT processing of the samples.
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Zhang, G.F., Sauvage, X., Wang, J.T. et al. Evolution of a martensitic structure in a Cu–Al alloy during processing by high-pressure torsion. J Mater Sci 48, 4613–4619 (2013). https://doi.org/10.1007/s10853-013-7153-8
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DOI: https://doi.org/10.1007/s10853-013-7153-8