MATERIALS TRANSACTIONS
Online ISSN : 1347-5320
Print ISSN : 1345-9678
Effect of Ultrasonic Vibration Pretreatment on Microstructural Evolution and Mechanical Properties of Extruded AZ91 Alloy
Yoshiaki OsawaXinbao LiuSusumu TakamoriHidetoshi SomekawaToshiji Mukai
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2008 Volume 49 Issue 5 Pages 972-975

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Abstract

An AZ91 alloy pretreated by ultrasonic vibration (UV) was subjected to extrusion to refine the microstructure. The results indicated that the UV pretreatment had a strong influence on the microstructure evolution and mechanical properties of the extruded AZ91 alloy. With UV pretreatment, a fine and uniform microstructure with an average grain size of 13.5 μm was obtained, and the fraction of the fiber-like, partially-recrystallized, structure was markedly reduced. In addition to the superior mechanical properties such as a yield strength of 256 MPa, an ultimate tensile strength of 320 MPa and a fracture elongation of 9.7% were achieved in the extruded AZ91 alloy with UV pretreatment.

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© 2008 The Japan Institute of Metals and Materials
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