Paper Titles
Deformation Mechanism Map of Nanocrystalline Metallic Materials
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Effect of Zr-Doped Ceria Catalyst on Carbon Deposition on Ni/YSZ Cermets
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Enhanced Strength and Ductility at a Cryogenic Temperature in a Nanostructured Ni-Fe Alloy
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Grain Size Saturation during Severe Plastic Deformation
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Nanostructuring a Zr-Hf Alloy via Large Strain Rolling
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Microstructural Characteristics of Cu-Fe-P Alloys Severely Deformed by Accumulative Roll Bonding Process
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Application of Equal-Channel Angular Pressing to Aluminum and Copper Single Crystals
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Coarse Second Phase Particle Size Distribution of UFG Al Alloys Processed by Severe Plastic Deformation: Effect on Cavitation during Superplastic Deformation
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An Alternative Constitutive Equation for Superplasticity
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Nanostructuring a Zr-Hf Alloy via Large Strain Rolling

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Abstract:

A coarse grained Zr-Hf alloy has been subjected to one rolling pass with different thickness reductions ranging from 10% to 80%. Rolling was performed at three temperatures: 300°C, room temperature (RT) and liquid nitrogen temperature (-196°C). It has been found that, with increasing strain per pass, i.e., with increasing strain rate, the deformation mechanism changes from twinning to dislocation slip. The minimum strain per pass necessary to trigger the transition in deformation mechanism decreases with decreasing temperature. High strain, high strain-rate deformation leads to the development of an ultrafine grained structure. Simultaneously, a basal type rolling texture forms. At the higher temperatures (RT and above) a recrystallization texture component is also present. Thus, nanostructuring of this Zr-Hf alloy during severe rolling is attributed to a combination of grain subdivision by the formation of geometrically necessary boundaries and to nucleation and growth phenomena taking place as a consequence of rapid adiabatic heating.

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Periodical:

Materials Science Forum (Volumes 539-543)

Pages:

2843-2848

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.539-543.2843

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Online since:

March 2007

Authors:

Maria Teresa Pérez-Prado, F. Salort, Ling Jiang, Oscar Ruano, Michael E. Kassner

Keywords:

Large Strain Rolling, Texture, Ultra-Fine Grained Zr

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© 2007 Trans Tech Publications Ltd. All Rights Reserved

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