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J. May M. Dinkel D. Amberger H.W. Höppel M. Göken 《Metallurgical and Materials Transactions A》2007,38(9):1941-1945
The kind and amount of alloying elements strongly affects the formation of ultrafine-grained microstructures. Aluminum alloys
with different amounts of the alloying element magnesium, and a commercially pure aluminum alloy, have been investigated in
order to evaluate how the obtained microstructures will affect the mechanical properties. X-ray profile analysis has been
used to determine grain size and dislocation density. With increasing amounts of alloying elements, a smaller grain size and
a higher dislocation density after severe plastic deformation (SPD) are obtained, which lead to higher hardness and improved
fatigue properties.
This article is based on a presentation made in the symposium entitled “Ultrafine-Grained Materials: from Basics to Application”,
which occurred September 25-27, 2006 in Kloster Irsee, Germany.
相似文献
J. MayEmail: |
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Anantha Puthucode Rajarshi Banerjee Suman Vadlakonda Reza Mirshams Michael J. Kaufman 《Metallurgical and Materials Transactions A》2008,39(7):1552-1559
This study focuses on investigating certain aspects of deformation in bulk metallic glasses (BMGs) based on nanoindentaion
and microindentation studies. Using a Berkovich indenter in nanoindentation, the incipient plasticity or early stages of deformation
have been studied for a typical BMG, Vitreloy 1. From a critical analysis of the load-displacement curves, the initial displacement
burst, often associated with the initiation of shear bands, was found to occur at a value close to the theoretical shear stress
of the material. The deformation behavior below these indents, including the formation of shear bands, has been investigated
by transmission electron microscopy. The evidence suggests structural changes associated with possible expansion of free volume
within the shear bands, especially in the case of deformation under higher loads. Furthermore, while the possibility of nanocrystallization
within the shear bands cannot be ruled out, the experimental results do not conclusively indicate the occurrence of such a
phenomenon.
This article is based on a presentation given in the symposium entitled “Materials Behavior: Far from Equilibrium” as part
of the Golden Jubilee Celebration of Bhabha Atomic Research Centre, which occurred December 15–16, 2006 in Mumbai, India.
相似文献
Rajarshi Banerjee (Associate Professor)Email: |
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