1–10 of about 122 matches for magnesium -iron -aluminum
Recent Developments on Ultrasonic Cavitation Based Solidification Processing of Bulk Magnesium Nanocomposites (20082701)
International Journal of Metalcasting V2 I1 P57-65
This paper presents the results from our recent development in cast bulk Mg nanocomposites, SiC nanoparticles reinforced magnesium and magnesium alloys including pure magnesium, and Mg-(2,4)Al-Si and Mg-4Zn were successfully fabricated by ultrasonic cavitation based dispersion of SiC nanoparticles in magnesium melt. As compared to un-reinforced magnesium alloy matrix, the mechanical properties including tensile strength and yield strength were improved significantly while the ductility was retained or even improved. In the microstructure, the grain size was refined considerably by SiC nanoparticles. While same micro SiC clusters still exist in the magnesium matrix, ultrasonic cavitation based processing is very effective in dispersing SiC nanoparticles. A SEM study showed that SiC nanoparticles were dispersed quite well in the areas outside micro SiC clusters. A TEM study on the interface between SiC nanoparticles and magnesium alloy matrix indicates that SiC nanoparticles bonded well with Mg matrices without forming an intermediate phase.
Framework for a Comparative Life Cycle Assessment of Magnesium and Steel Autoparts (20082878)
Proceedings of the Third International Conference on Light Metals Technology Sept 24-26 2007 Quebec, Canada P243-248
The physical properties of magnesium alloys can be exploited for substituting carbon steel components in cars for a subsequent reduction in fuel consumption and tailpipe emissions, while maintaining the same safety performance. A collaborative life cycle assessment (LCA) between Canada-USA in partnership with Australia is being undertaken for the “Magnesium Front End Research and Development” project. Energy use and potential environmental impacts of using magnesium alloys are assessed in relation to conventional carbon steel front-end parts used in a North America (NA) build luxury vehicle driven for 200,000 km in NA. The scope of this cradle-to-cradle LCA study is limited to NA with the exception of the production of magnesium ingots that is occurring in China. Preliminary LCA results indicate the importance of a wider availability of magnesium life cycle inventory data and demonstrate the fundamental importance of the “end-of-life” recycling of magnesium in order to realize the full benefits of lightweight materials.
MAGNESIUM DRIVING TO PERMANENT MOLD (20072123)
Engineering Casting Solutions V7 N 5 P 29-33, July 2005 (5 p)
Reduced weight is a key term throughout the automotive industry. Currently, magnesium alloys are used for diecast automotive components, such as seat frames, instrument panels and steering wheels. However, there are potential applications such as engine and structural components that cannot be readily die cast. Processes such as lost-pressure permanent mold (LPPM) alloy for magnesium in applications that are not currently feasible. This article discusses the first phase of a project to develop a cast magnesium alloy engine cradle for a Chevrolet Corvette. Several magnesium alloys, such as AM50, MRI 202S-T6 and AZ91 are discussed for this application. Problems associated with casting this cradle are reviewed and pictures of these efforts are shown in the article.
Thixomolded Magnesium: It’s Status and Model Relating Structure and Solid State Properties (20072348)
The Third International Conference on Semi-Solid Processing of Alloys and Composites June 13-15, 1994
Thixomolding produces net-shape parts from Magnesium alloys in an environmentally friendly one step process. Unlike other semi-solid processes, an as cast feedstock is introduced into the machine at room temperature. In a single step the room temperature alloy is transformed to the thixotropic rheological state accumulated to a desired volume, and injected under high pressure and velocity into a closed die producing the net shape molding. L. Pasternat, et al. (1992) have previously given a comprehensive review of this process and the Thixomolding machine. Since that time, an intensive development program has been carried out using that machine. It has provided an invaluable tool for the development of a mechanical properties data base and has permitted the evaluation of its potential to process a variety of commercially important Magnesium die casting alloys. A wide range of prototyping investigations on commercial products have been carried out, as well as large volume sub-scale manufacturing studies. It has also been used to investigate the increasingly important aspects of direct recycling. This paper will conclude with a discussion of the microstructure of Thixomolded Magnesium and a model relating the mechanical properties of the solid state to the microstructure for volume fraction solids, fs, up to 0.65 for the semi-solid state.
Use of Laser and Friction Stir Welding for Aerospace Magnesium Alloys (20082856)
Proceedings of the Third International Conference on Light Metals Technology Sept 24-26 2007 Quebec, Canada P158-163
High energy-density laser and solid-state friction stir welding (FSW) have been identified as promising joining techniques for magnesium alloys since they can reduce or eliminate some typical defects such as underfill, sag, loss of alloying elements, pores, cracks, residual stresses and distortion encountered in conventional arc welding. At the NRC Institute for Aerospace Research, an extensive R&D program on laser welding and friction stir welding of aerospace magnesium alloys has been undertaken. These investigations have concentrated mainly on process window optimization as well as understanding the fundamental process-structure-property relationships to reliably produce high quality welded joints. The research progresses made and the main issues encountered in laser welding and FSW of some aerospace magnesium alloys will be briefly summarized in this work. The reliability and reproducibility of the welding processes are also addressed.
CHARTING A COURSE FOR MAGNESIUM (20072107)
Modern Casting V 95 N 10 P 39-43, Oct 2005 (5 p)
Magnesium casting is in an enviable position to enter new and growing markets. In 2004, the U.S. magnesium casting industry culminated ten years of remarkable growth by shipping nearly 100,000 tons of castings to a wide range of markets including automotive, aerospace, power tools and sporting goods. But a course of action must be outlined to reach optimal growth. A road map of research needs are outlined in the article and these needs are broken into (1) near-term(2005-2010), (2) mid-term (2010-2013) and (3) long-term (2013 and beyond). In order to reach new markets an atlas of properties is needed. The article thoroughly describes the action needed and also provides photographs of cast magnesium components, including an investment-cast telescopic trailer tow mirror mount.
Design and Deposition of Corrosion Protective Supersaturated Magnesium Alloy Systems by PVD Processes (20082852)
Proceedings of the Third International Conference on Light Metals Technology Sept 24-26 2007 Quebec, Canada P135-139
PVD techniques such as magnetron and ion beam sputtering as well as vacuum arc deposition are able to produce supersaturated precipitation free and microcrystalline magnesium layers due to the high cooling rates of the film forming particles upon arrival at the substrate surface. These layers are highly textured and have corrosion properties that make them possible candidates for cathodic corrosion protection of conventional magnesium alloy components. Possible design of new magnesium based alloys and for tailoring corrosion properties will be discussed.
Extrusion of Magnesium Alloys for Structural Applications (20082870)
Proceedings of the Third International Conference on Light Metals Technology Sept 24-26 2007 Quebec, Canada P195-200
Wrought magnesium alloys are of interest for lightweight structural applications as a result of their more homogenous microstructures and improved mechanical properties compared to cast components. Extrusion as a shaping technology offers the possibility to produce a wide variety of magnesium alloy profiles. In this contribution, we describe the role of microstructure on the mechanical properties of a number of extruded magnesium alloys with particular emphasis on grain size and composition effects on the tensile/compression deformation behavior.
Magnesium Sheet Alloys for Structural Applications (20082861)
Proceedings of the Third International Conference on Light Metals Technology Sept 24-26 2007 Quebec, Canada P189-194
Rolled magnesium sheets are in the focus of present research activities to establish magnesium as lightweight structural components. Hence, it is of fundamental interest to understand the effects of rolling process parameters on the deformation behavior f the sheet. Rolling trials were conducted using magnesium alloy ZM21 in cast condition at different rolling temperatures in different degrees of deformation per pass. Mechanical tests, metallographic characterization and texture measurements were used to describe the influence of process parameters on the property development of the sheets.
Damage Modeling of Die-Cast Magnesium Alloy AM60B (20082849)
Proceedings of the Third International Conference on Light Metals Technology Sept 24-26 2007 Quebec, Canada P109-114
Damage evolution is investigated in die-cast magnesium alloy AM60B sample using finite element modeling, X-ray tomography analysis, and fracture analysis. The fracture characteristics due to internal porosity of tensile samples cut from a complex die casting have been examined using X-ray tomography analysis techniques and by analyzing fractured samples from tensile testing with a simulated pore (drilled hole) introduced in the gauge length. These techniques have shown the pore growth and the effects of porosity on the fracture properties in uniaxial loading. FEM is used to simulate a standard uniaxial tensile test of the die-cast magnesium alloy AB60B and further inspect the effects of internal porosity upon the fracture characteristics, including initiation, strength, and ductility.
1–10 of about 122 matches for magnesium -iron -aluminum
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