The Upper Fremont Glacier (UFG), Wyoming, is one of the few continental glaciers in the contiguous United States known to preserve environmental and climate records spanning recent centuries. A pair of ice cores taken from UFG have been studied extensively to document changes in climate and industrial pollution (most notably, mid-19th century increases in mercury pollution). Fundamental to thes...

Ti Grade 2 was prepared by cryogenic attritor milling in liquid nitrogen and liquid argon. Two types of milling balls were used—stainless steel balls and heavy tungsten carbide balls. The effect of processing parameters on particle size and morphology, contamination of powder and its microhardness was investigated. Milling in liquid nitrogen was not feasible due to excessive contamination by ni...

1Professor Associado de Neuropsiquiatria do Curso de Medicina da Universidade Federal de Goiás (UFG). Programa de Pós-Graduação em Saúde Pública do Instituto de Patologia Tropical e Saúde Pública e Programa de Ciências da Saúde da UFG, Goiânia GO, Brasil; 2Médico Assistente do Hospital das Clínicas da UFG. Programa de Pós-Graduação em Ciências da Saúde da UFG, Goiânia GO, Brasil. Correspondence...

[1] Site-specific transfer functions relating delta oxygen 18 (dO) values in snow to the average air temperature (TA) during storms on Upper Fremont Glacier (UFG) were used in conjunction with dO records from UFG ice cores to reconstruct long-term trends in air temperature from alpine areas in the Wind River Range, Wyoming. Transfer functions were determined by using data collected from four se...

In the present study, various literature based on high strain rate behaviour of ultrafine-grained (UFG) aluminium alloys produced through severe plastic deformation techniques have been discussed. It was observed from that under (3000–120000 s−1) adiabatic shear bands (ASBs) were formed which is main reason for dynamic failure. These ASBs failure Al when they exposed to impact. The are mainly t...

Abstract. The thermal stability of ultrafine-grained metals can be fully understood when observing time-resolved microstructural changes over multiple-length scales. global relaxation behavior upon heating an (UFG) CoCrFeNi high-entropy alloy (HEA) was characterized by in-situ neutron diffraction measurements. Before heating, the nanocrystalline microstructure introduced applying high-pressure ...

Although severe plastic deformation causes grain refinement of polycrystalline materials, saturation is known to be caused by simultaneous coarsening. In the present study, for ultra-fine-grained (UFG) pure Al prepared equal-channel angular pressing, we studied and coarsening processes during large simple-shear using scanning electron microscopy/electron backscatter diffraction. The changes cry...

The influence of the strain rate on plasticization effect (PE) ultrafine-grained (UFG) Al-1.47Cu-0.34Zr (wt%) alloy structured by high pressure torsion. A significant increase in plasticity (more than 2 times) while maintaining a level strength (ultimate tensile ~465 MPa) UFG was achieved as result additional deformation-heat treatment (DHT), consisting low-temperature annealing and small defor...

This paper presents the results of a comprehensive study erosive wear resistance, strength, and adhesive characteristics high-temperature structural titanium alloy Ti-5.7Al-3.8Mo-1.2Zr-1.3Sn (the Russian grade VT8M-1) with coarse-grained ultrafine-grained (UFG) structures protective erosion-resistant TiVN coating produced by physical vapor deposition (PVD), deposited on surface. A microscopic a...

The present work was undertaken to improve superplastic ductility of friction-stir welded joints ultrafine-grained (UFG) Al–Mg–Sc–Zr alloy. In order suppress the undesirable abnormal grain growth, which typically occurs in heavily deformed base material, UFG material produced at elevated temperature. It suggested that new processing route could reduce dislocation density structure and thus enha...