Maria T. Perez-Prado

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Shear stresses are shown to induce the alpha (hcp) to omega (simple hexagonal) plus beta (bcc) transformation in pure Zr at room temperature. The beta Zr thus fabricated is stable at 1 atm and room temperature. This phase has so far only been found to occur at high pressures (P>30 GPa) and/or at high temperatures (T>1135 K). This experimental observation(More)
Yong Xiang, Joost J. Vlassak, Maria T. Perez-Prado, Ting Y. Tsui, Andrew J. McKerrow 1 Division of Engineering and Applied Sciences, Harvard University, 29 Oxford St., Cambridge, MA 02138 2 Department of Physical Metallurgy, Centro Nacional de Investigaciones Metalurgicas, CSIC Avda.Gregorio del Amo, 8, 28040 Madrid, Spain 3 Texas Instruments Inc., MS 3736,(More)
The work carried out by the authors over the last decade on the processing, microstructural characterization and the mechanical behaviour of Mg alloys is reviewed. In particular, the potential for grain refinement and for the development of specific textures of large strain hot rolling (LSHR), equal channel angular pressing (ECAP) and accumulative roll(More)
The room temperature strength of two commercial cast Mg alloys, AZ91 and AM60, processed by severe rolling and accumulative roll bonding (ARB), was investigated. It has been found that a simple onestep large strain rolling process can be used to fabricate sheets that are both extraordinarily strong and remarkably ductile at room temperature. Subsequent(More)
We have investigated a novel ultrafine grained (UFG) Zr obtained by severe plastic deformation (SPD) which resulted in a refinement of the grain size by several orders of magnitude. Compared to conventional Zr, higher hardness values were measured on UFG Zr. Polished surfaces having similar topographical features from both materials were prepared, as(More)
The aim of this paper is to study the influence of the initial microstructure of several Mg-Al alloys on their superplastic formability and on their post-forming microstructure and mechanical properties. Various thermomechanical processing routes, such as annealing, conventional rolling, severe rolling and cross rolling, were used in order to fabricate AZ31(More)
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