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Friction stir back extrusion (FSBE) is a technique for lightweight metal extrusion. The frictional heat and severe plastic deformation of the process generate an equiaxed refined grain structure because of dynamic recrystallization. Previous studies proved that the fabrication of tube and wire structures is feasible. In this work, hollow cylindrical billets of 6063-T6 aluminum alloy were used as starting...
Introduction and Aims
Alcohol‐related harm reduction may target individuals, their households or communities. This study investigates the prevalence of and socioeconomic inequalities in alcohol use and alcohol‐related consequences (injury, accident, property loss and interpersonal violence) at the family‐level.
Designs and Methods
A cross‐sectional survey of 2394 households was conducted in eight...
Purpose To determine whether perioperative desaturation (PD) in preschool children undergoing non-cardiac surgery is associated with subsequent impairment of intelligence or subsequent change in age-specific weight and height percentile. Method A historical-concurrent follow-up study was conducted in children aged ≤ 60 months who underwent general anesthesia (GA) for non-cardiac surgery between...
This study presents a solid state surface engineering technique for forming a composite surface layer on aluminum to improve surface hardness and wear resistance without sacrificing the ductility and conductivity of the bulk. Friction stir processing (FSP) was used to stir and mix sub-micro-size Al 2 O 3 and SiC particles into the surface of an aluminum 6061-T651 alloy plate to form...
These experiments were done to evaluate the feasibility of locally modifying the surface properties of magnesium alloys with friction-stir processing. The magnesium alloy used for the study was high-pressure die-cast AM60B, nominally Mg−6Al−0.13 Mn (wt.%). Friction-stir passes were made with a translation speed of 1.7 mm/s using tool-rotation speeds of 1,250 rpm or 2,500 rpm. Stir passes with good...
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