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Title: Does Shear Thickening Occur in Semisolid Metals?
Authors: Atkinson, Helen Valerie
Favier, V.
First Published: 20-Jan-2016
Publisher: Springer US for Minerals, Metals and Materials Society (TMS)
Citation: Metallurgical and Materials Transactions A, 2016, 47A (4), pp. 1740-1750 (11)
Abstract: In the various forms of semisolid processing such as thixoforming and thixoforging, the entry into the die occurs in a fraction of a second so it is the transient rheological behavior which governs the initial stages of flow. In experiments in the literature, this rheological behavior is probed through applying rapid transitions in shear rate under isothermal conditions. There is contradictory evidence as to whether the behavior during these transitions is shear thinning or shear thickening, although it is clear that once in the die the material is thinning. Here the data in the literature are reanalyzed to obtain a rationalization of the contradictions which has not previously been available. It is argued that if a suspension is initially in a disagglomerated state (i.e., one which is initially sheared), the instantaneous behavior with a jump-up in shear rate is shear thickening (even if the long-term steady-state behavior is shear thinning) provided the fraction solid is greater than about 0.36 and the final shear rate at the end of the jump is greater than about 100 s−1. If the jump-up in shear rate is made from rest then yield masks the shear thickening.
DOI Link: 10.1007/s11661-015-3307-4
ISSN: 1073-5623
eISSN: 1543-1940
Version: Publisher Version
Status: Peer-reviewed
Type: Journal Article
Rights: Copyright © The Authors 2016. This article is published with open access at
Appears in Collections:Published Articles, Dept. of Engineering

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