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International Journal of Forming Processes
1292-7775
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 ARTICLE VOL 4/3-4 - 2001  - pp.237-251  - doi:10.3166/ijfp.4.237-251
TITLE
Semi-solid Processing of Engineering Alloys by a Twin-screw Rheomoulding Process

ABSTRACT

Based on the extensive experience in injection moulding of polymeric materials, a twin-screw rheomoulding process has been developed for semi-solid metal (SSM) processing of engineering alloys. In this process, a liquid alloy is fed into a twin-screw extruder, where the liquid alloy is sheared and cooled to a temperature between its liquidus and solidus to produce the desirable SSM slurry. The sheared semi-solid slurry is then transferred to a mould cavity for component shaping. The experimental results of rheomoulded alloys have demonstrated that, compared with other existing SSM processing techniques, the twin-screw rheomoulding process has many advantages, including production of fine and spherical solid particles distributed uniformly in the matrix, accurate control over a large range of solid volume fractions, easy operation, shorter cycle time and lower overall component cost.

AUTEUR(S)
Zhongyun FAN, Shouxun JI, Mike J. BEVIS

Reçu le 1 juillet 2001.    Accepté le 15 octobre 2001.

KEYWORDS
Semi-solid, metals, processing, rheomoulding, microstructure.

LANGUE DE L'ARTICLE
Anglais

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