Dynamic recrystallisation and superplasticity in pure aluminium with zirconium addition

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• 作者：S. Katsas ; R. Dashwood ; R. Grimes ; M. Jackson ; G. Todd ; H. Henein
• 关键词：Superplasticity ; Aluminium alloy ; Dynamic recrystallisation ; Rapid solidification ; Zirconium
• 刊名：Materials Science and Engineering: A
• 出版年：2007
• 出版时间：25 January 2007
• 年：2007
• 卷：444
• 期：1-2
• 页码：291-297
• 全文大小：1869 K

文摘

When commercial superplastic aluminium alloys were first under development it was concluded that to be successful the alloy should contain both a solid solution addition and a dispersion of fine, thermally stable dispersoids. In contrast to early beliefs, the present work demonstrates that a simple Al–1 wt. % Zr alloy can exhibit good superplastic performance despite the absence of a solid solution element. The starting material was in the form of 1 mm diameter particles produce via impulse atomisation that conferred a solidification rate 10p>3p> K sp>−1p>. After extrusion consolidation, heat treatment to produce a fine distribution of metastable Al₃Zr precipitates, and rolling, the resulting sheet exhibited superplastic ductilities in excess of 500 % at a strain rate of 10p>−1p> sp>−1p>. An EBSD study of the deformation behaviour demonstrated substantial grain refinement resulting from dynamic recrystallisation.