668 research outputs found
Report of International NanoSPD Steering Committee and statistics on recent NanoSPD activities
No full textThe Université de Lorraine in Metz, France, is the selected site for the 6th International Conference on Nanomaterials by Severe Plastic Deformation (NanoSPD6) following a series of five earlier conferences. This introductory paper reports on several major developments in NanoSPD activities as well as on very recent NanoSPD citation data which confirm the continued growth and expansion of this important research area. Close attention is given to the topics of workshops, conferences and seminars organized during these last three years as well as on books and reviews published prior to the NanoSPD6 conference. A special concern of the committee is in introducing and discussing the appropriate terminology to be applied in this new field of materials science and engineerin
The processing of ultrafine-grained materials through the application of severe plastic deformation
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The properties of bulk ultrafne-grained materials processed through the application of severe plastic deformation
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Grain boundary sliding in creep and superplasticity: the Gifkins Decades and twenty-five years later
No full textProceso de materiales ultrafino-granulosos usando la deformación plástica severa: potencial para alcanzar características excepcionales
No full textEl procesado de metales policristalinos a través de deformación plástica severa está atrayendo mucha atención, debido al potencial para alcanzar un importante afino de grano a niveles submicrométricos o nanométricos. Esta publicación revisa los principios de este tipo de procesado haciendo hincapié en dos técnicas diferentes: prensado en canal angular y torsión bajo alta presión. Mediante estos procesos, se pueden alcanzar propiedades excepcionales incluyendo alta resistencia a temperatura ambiente y una capacidad de conformación superplástica rápida a elevadas temperaturas. Se presentan algunos ejemplos demostrando el uso potencial de este tipo de procesado
Identifying creep mechanisms in plastic flow
No full textThe mechanisms occurring in plastic flow at elevated temperatures may be divided into three distinct classes depending upon whether they are intragranular dislocation mechanisms, grain boundary sliding including superplasticity or diffusion creep occurring through vacancy flow. The characteristics of these various mechanisms are described and procedures are outlined for distinguishing between the different processes. Using this approach, it is shown that there is good experimental data supporting the occurrence of both Harper Dorn creep and Nabarro Herring diffusion creep as distinct creep processes. Recent results reported from computer simulations, combined with experimental observations, suggest the possible occurrence of grain boundary sliding at low temperatures in nanostructured and ultrafine-grained materials
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