Semi-solid Processing of Alloys by David H. Kirkwood, Michel Suéry, Plato Kapranos, Helen V. PDF

By David H. Kirkwood, Michel Suéry, Plato Kapranos, Helen V. Atkinson, Kenneth P. Young

ISBN-10: 3642007058

ISBN-13: 9783642007057

ISBN-10: 3642007066

ISBN-13: 9783642007064

This publication offers the state-of-the-art in regards to the basic points of semi-solid processing of alloys and composites, including the commercial purposes. the basic points comprise either the microstructure improvement and characterization, and the rheology of alloy slurries with targeted consciousness to either experimental selection and modeling. the commercial functions also are surveyed and specific attention is given to contemporary advancements in slurry formation. Foreword supplied via Prof. Merton C Flemings (MIT), the daddy and originator of semi-solid processing.

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The alloys studied from a rheological point of view belong essentially to three categories: the model alloys like Sn–Pb with a low melting temperature for which the experiments are relatively easy, the aluminum and magnesium alloys, which are the main thixoformed alloys, and the alloys with a high melting temperature for which only feasibility tests have been carried out. For the characterization of the rheological behavior of these semisolid alloys, two approaches are usually adopted. The first approach is concerned with the semi-liquid state: the alloy contains low fractions of solid so that the behavior is described in terms of an apparent viscosity.

This apparatus has been used for the study of aluminum alloys during solidification at particularly large solid volume fractions [8]. In the following, the results obtained with these viscometers will not be reported since they are mainly concerned with dendritic structures during solidification and transitions in the behavior when the solid fraction increases. Shearing of a semisolid alloy can be produced by parallel plate compression. Although this type of test is better suited for partially remelted billets, it has been employed also with billets transferred from the cooling system to the parallel plate test machine [9, 10].

Similar curves have been obtained on other semisolid alloys like industrial Al–Si alloys and on alloys containing SiC particles. Bfs / have been used. 1 gives the values of B deduced from viscometer experiments on various alloys. s 20 Fig. 4 1 Continuous cooling at 0:33 C min Shear rate of 750 s A356 References ı Shear rate of 750 s Sn-15%Pb Value of B Conditions of the tests 1 Isothermal holding Shear rate of 26 to 210 s 1 50 6 Experimental Determination of Rheological Behavior values deduced from isothermal experiments are also included together with results on composites.

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Semi-solid Processing of Alloys by David H. Kirkwood, Michel Suéry, Plato Kapranos, Helen V. Atkinson, Kenneth P. Young

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