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【资源】aluminum alloy castings properties processes and applications
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Aluminum Alloy Castings Properties, Processes, and Applications J. Gilbert Kaufman Elwin L. Rooy 1.1 Background and Scope It is the objective of this book to comprehensively summarize material properties and engineering data for aluminum alloy cast- ings and to address the need for a single reference that covers production, quality assurance, properties, and applications of alu- minum alloy castings. Unlikemost sources, the content addresses not only conventional sand and permanent mold castings, but also pressure die castings and many of the variations of all three that have developed over the years. The physical and mechanical properties of aluminum castings may be altered through: • Alloying composition: The composition of alloys determines the potential for achieving specific physical and mechanical properties. Alloy content is designed to produce characteristics that include castability as well as desired performance capa- bilities. The interaction of alloying elements is recognized in promoting desired microstructural phases and solid-solution effects for the development of these properties. • Cooling rate during and after solidification: The conditions under which solidification takes place determine the structural features that affect the physical and mechanical properties of an alloy. • Casting process: There are a large number of casting processes, and each imposes different rates of heat extraction, solidifica- tion rates, and means of compensating for solidification-related microstructural and macrostructural tendencies. • Solidification: Engineered castings are susceptible to internal and superficial defects. The complex geometries of shaped cast- ings, fluid dynamics, and solidification mechanics combine to present unique and difficult challenges to the objective of dense, discontinuity-free parts. Internal porosity can result fromshrink- age and hydrogen porosity, as well as from visually detectable defects such as misruns, cracks, moisture reactions, folds, and tears. Nonmetallic inclusions affect mechanical properties and nucleate hydrogen pore formation. Pore volume fraction and the geometry and distribution of internal voids reduce tensile properties, fatigue strength, toughness, and ductility, while sur- face defects strongly influence mechanical and fatigue perfor->>>>>>>> http://d.namipan.com/d/13d472e45 ... cf4daf1cf7a7e10a900 http://d.namipan.com/d/13d472e45 ... cf4daf1cf7a7e10a900 http://d.namipan.com/d/13d472e457bc9c1dd8b2e152e7785cf4daf1cf7a7e10a900 |
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