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Home  >  Journal list  >  MATERIALS TRANSACTIONS  >  Vol.43  No.8 (2002)  >  pp.2110-2114

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Semi-Solid Consolidation Processing of Rapidly Solidified Powders for Fabrication of High Strength AZ91 Magnesium Alloys

Toshiyuki Nishio1), Keizo Kobayashi1), Akihiro Matsumoto1) and Kimihiro Ozaki1)
1) National Institute of Advanced Industrial Science and Technology

Rapidly solidified AZ91 magnesium alloy was fabricated by a single roll technique. Microstructure of the alloys were composed of a fine-grain supersaturated α–Mg solid solution with a small amount of β-Mg17Al12 precipitates dispersed. The ribbons were successively crushed into fine powders using mechanical grinding apparatus and preformed at 673 K using pulse current sintering machine. The preformed compacts were extruded into a bar using semi-solid consolidation process at 723 K . The pressure needed to extrude preformed AZ91 compacts was 110 MPa about 40% lower than that of as-cast alloys. Semi-solid consolidated specimen after heat treatment showed high tensile strength 350 MPa. These were mainly attributed to grain refinement. The process proposed in this study led to the improvement of formability and also tensile strength for AZ91 alloys.

rapid solidification, AZ91 magnesium alloy, semi-solid consolidation process, microstructure, formability, tensile strength

Received: April 08, 2002
Accepted: June 10, 2002 , Published online: September 06, 2005
Copyright (c) 2005 The Japan Institute of Metals



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