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imrsfb鐵桿木蟲 (著名寫手)
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[資源]
【原創(chuàng)】PRL, PRB 最新玻璃文獻(xiàn)
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Phys. Rev. B 80, 104104 (2009) [5 pages] Effects of focused ion beam induced damage on the plasticity of micropillars Jaafar A. El-Awady,1 Christopher Woodward,1 Dennis M. Dimiduk,1 and Nasr M. Ghoniem2 1Air Force Research Laboratory, Materials and Manufacturing Directorate, AFRL/RXLM Wright-Patterson AFB, Ohio 45433-7817, USA 2Mechanical and Aerospace Department, University of California, Los Angeles, California 90095-1597, USA Received 2 July 2009; revised 12 August 2009; published 9 September 2009 The hardening effects of focused ion beam (FIB) induced damage produced during the fabrication of micropillars are examined by introducing a surface layer of nanosized obstacles into a dislocation dynamics simulation. The influence of the depth and strength of the obstacles as a function of pillar diameter is assessed parametrically. We show that for a selected set of sample sizes between 0.5 and 1.0 µm, the flow strength can increase by 10–20 %, for an obstacle strength of 750 MPa, and damage depth of 100 nm. On the other hand, for sizes larger and smaller than this range, the effect of damage is negligible. Results show that the obstacles formed during the FIB milling may be expected to alter the microstructure of micropillars, however, they have a negligible effect on the observed size-strength scaling laws. http://scitation.aip.org/getabs/ ... =cvips&gifs=yes Phys. Rev. Lett. 103, 115701 (2009) [4 pages] Irreversible Rearrangements, Correlated Domains, and Local Structure in Aging Peter Yunker,1 Zexin Zhang,1,2 Kevin B. Aptowicz,3 and A. G. Yodh1 1Department of Physics and Astronomy, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA 2Complex Assemblies of Soft Matter, CNRS-Rhodia-UPenn UMI 3254, Bristol, Pennsylvania 19007, USA 3Department of Physics, West Chester University, West Chester, Pennsylvania 19383, USA Received 3 June 2009; revised 3 August 2009; published 9 September 2009 Bidisperse colloidal suspensions of temperature-sensitive microgel spheres were quenched from liquid to glass states by a rapid temperature drop, and then the glass was permitted to age. Irreversible rearrangements, events that dramatically change a particle's local environment, were observed to be closely related to dynamic heterogeneity. The rate of these irreversible events decreased during aging and the the number of particles required to move as part of these irreversible rearrangements increased. Thus, the slowing dynamics of aging were governed by growing, correlated domains of particles. Additionally, short-range order developed, and a spatial decay length scale associated with orientational order was found to grow during aging. http://scitation.aip.org/getabs/ ... =cvips&gifs=yes |
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鐵桿木蟲 (著名寫手)
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hslining(金幣+6,VIP+0):很好的資源。 9-17 10:51
hslining(金幣+6,VIP+0):很好的資源。 9-17 10:51
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