Abstract
Grain refinement of metallic materials may be achieved by imposing severe plastic deformation through procedures such as equal-channel angular pressing or high pressure torsion straining. The grain sizes produced by these techniques are generally below 1 μm and it is therefore necessary to make use of advanced analytical procedures in order to characterize the fine-grained microstructures. This report describes the application of high-resolution electron microscopy (HREM) to atomic-scale observations of the ultrafine-grained structures produced in Cu, Ni and alloys of Ni-Al-Cr and Al-Mg by torsion straining. It is demonstrated that the grain boundaries in these materials are in a high-energy nonequilibrium condition, with irregular arrangements of facets and steps at the interfaces. The thermal stability of these ultrafine-grained microstructures is examined by annealing the samples at elevated temperatures.
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Horita, Z., Furukawa, M., Nemoto, M., Valiev, R.Z., Langdon, T.G. (2000). Characterization of Ultrafine-Grained Structures Produced by Severe Plastic Deformation. In: Lowe, T.C., Valiev, R.Z. (eds) Investigations and Applications of Severe Plastic Deformation. NATO Science Series, vol 80. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-4062-1_21
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DOI: https://doi.org/10.1007/978-94-011-4062-1_21
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