Deformation behaviour of aluminum alloy A356 in semisolid state

Wang, H. and Ning, Z. L. (2009) Deformation behaviour of aluminum alloy A356 in semisolid state. In: ACMSM 20: Futures in Mechanics of Structures and Materials, 2-5 Dec 2008, Toowoomba, Australia.

Abstract

The deformation behaviours of A356 alloy with various initial grain structures, from a very coarse dendrite to a fine equiaxed structure, prepared at different pouring temperatures were investigated. Cylindrical specimens were compressed to a height reduction of 6 mm at an initial strain rate of 1.39 × 10-3/s and then jumped to 1.39 × l0-2/s. The instantaneous strain rate sensitivity was calculated under iso-structure conditions. Three very different deformation behaviours have been observed, which are believed to have resulted from their different starting microstructures. The materials produced at low pouring temperatures evolve into a fine globular structure after isothermal holding at semisolid region and shows a very low compression stress, while the materials cast at high pouring temperatures remain as coarse and dendritic in its microstructure and have one order of magnitude higher compression stress. The macrostructural breakage and microstructural segregation of hot compressed samples were analyzed and the deformation mechanisms were discussed.


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Item Type: Conference or Workshop Item (Commonwealth Reporting Category E) (Paper)
Refereed: Yes
Item Status: Live Archive
Additional Information: Permanent restricted access to published verison due to publisher copyright policy. 2 print copies held in USQ Library at call no. 624 Fut.
Depositing User: epEditor USQ
Faculty / Department / School: Historic - Faculty of Engineering and Surveying - No Department
Date Deposited: 29 Feb 2012 07:16
Last Modified: 16 Sep 2012 23:44
Uncontrolled Keywords: A356 alloys; compression stress; cylindrical specimens; deformation behaviour; deformation mechanism; equiaxed structures; globular structure; grain structures; height reduction; initial strains; isothermal holding; micro-structural; order of magnitude; pouring temperatures; semi-solid state; strain rate sensitivity; structure conditions
Fields of Research (FOR2008): 09 Engineering > 0912 Materials Engineering > 091207 Metals and Alloy Materials
09 Engineering > 0913 Mechanical Engineering > 091308 Solid Mechanics
09 Engineering > 0912 Materials Engineering > 091205 Functional Materials
Socio-Economic Objective (SEO2008): E Expanding Knowledge > 97 Expanding Knowledge > 970109 Expanding Knowledge in Engineering
URI: http://eprints.usq.edu.au/id/eprint/20887

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