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Introducing heterogeneities into the structure is an effective way to enhance the plasticity in metallic glasses (MGs). As natural heterogeneity, the original randomly distributed free volume in MGs has been found to be in favor of plasticity. However, the exact correlation between the free volume distribution and mechanical response is still unclear. In this paper, we investigate the shear banding in MGs with different structural disorders, characterized by both the free volume concentration (FVC) and the free volume dispersion (FVD). It is found that, either high FVC or wide FVD leads to low activation stress of shear band; wide FVD promotes the multiplication of shear bands but high FVC restricts it. It reveals that the yield strength in MGs is dependent on the amount of free volume while the plasticity mainly relies on the distribution. An optimum combination of the two aspects probably helps to design a MG of both good plasticity and high strength. metallic glass, free volume, shear band, yield strength

Michel Faure, et al.. A multidisciplinary study of the emplacement mechanism of the Qingyang-Jiuhua massif in Southeast China and its tectonic bearings. Part II: Amphibole geobarometry and gravity modeling. Journal of Southeast Asian earth sciences, Elsevier, 2014, 86, pp. HighlightsGeobarometry work shows that the studied massif intrudes into shallow crustal depth. Gravity modeling shows that the massif vertically or sub-vertically intruded. NE-SW tension gashes as magma conduits imply a syn-emplacement NW-SE regional extension. AbstractThe Late Mesozoic geology of the Lower Yangtze area is characterized by extensional sedimentary basins, numerous granitic plutons and several world-class ore deposits. Regionaly, the coeval tectonic and geodynamic framework remains inadequately investigated. In order to provide a more comprehensive understanding of the regional tectonic context, we performed a multidisciplinary study of the emplacement mechanism of the Qingyang-Jiuhua massif. It consists of the granodioritic Qingyang and the monzogranitic Jiuhua plutons, U-Pb dated at 142 ± 1.0 Ma and 131 ± 2.6 Ma, respectively. Biotite and amphibole cooling ages are 5-8 myr younger. Results deduced from field structural observation, petrographic and magnetic fabrics, paleomagnetism show that this massif was probably vertically emplaced by permissive intrusion coeval with weak regional extension. However, detailed information on the characteristics of this tectonic event and its emplacement depth was not documented. Therefore, we carried out an investigation of amphibole geobarometry and gravity modeling in order to address the emplacement mode of the plutons within their regional tectonic framework. Amphibole data show that the Qingyang-Jiuhua massif was emplaced in the upper crust at a depth between 5 and 12 km. Gravity modeling indicates that the massif is laccolithic. It is characterized by several NE-SW-striking linear thickening zones that we interpret as the feeder roots of the massif. These results led us to conclude that (1) the Qingyang-Jiuhua massif was fed by vertical, NE-SW striking tension gashes; (2) consequently the late Early Cretaceous tectonics in the study area was characterized by NW-SE extension.

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We utilized a high-frame-rate projector, a rotating mirror, and a cylindrical selective-diffusing screen to present a novel three-dimensional (3D) omnidirectional-view display system without the need for any special viewing aids. The display principle and image size are analyzed, and the common display zone is proposed. The viewing zone for one observation place is also studied. The experimental results verify this method, and a vivid color 3D scene with occlusion and smooth parallax is also demonstrated with the system.