Deformation behaviour of aluminium alloy A356 in semisolid state

Wang, Hao and Ning, Zhiliang (2009) Deformation behaviour of aluminium 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 course dendrite to a fine equiaxed structure, prepared at different pouring temperatures were investigated. Cylindrical specimens were compressed to a height reduction of 6mm at an initial strain rate of 1.39 x 10 -3/s and then jumped to 1.39 x 10-2/2. 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 in 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 course and dendritic in it microstructure and have an order of magnitude higher compression stress. The macro structural breakage and microstructural segregation of hot compressed samples were analyzed and the deformation mechanisms were discussed.


Statistics for USQ ePrint 13001
Statistics for this ePrint Item
Item Type: Conference or Workshop Item (Commonwealth Reporting Category E) (Paper)
Refereed: Yes
Item Status: Live Archive
Additional Information: Author version not held. Print held at USQ 624 FUT.
Depositing User: Bulkimport bulkimport
Faculty / Department / School: Historic - Faculty of Engineering and Surveying - No Department
Date Deposited: 14 Jan 2009 12:22
Last Modified: 16 Sep 2012 23:42
Uncontrolled Keywords: deformation; alloys; pouring temperature; compression
Fields of Research (FOR2008): 09 Engineering > 0912 Materials Engineering > 091299 Materials Engineering not elsewhere classified
?? 905 ??
09 Engineering > 0912 Materials Engineering > 091207 Metals and Alloy Materials
09 Engineering > 0915 Interdisciplinary Engineering > 091504 Fluidisation and Fluid Mechanics
Socio-Economic Objective (SEO2008): B Economic Development > 86 Manufacturing > 8611 Basic Metal Products (incl. Smelting, Rolling, Drawing and Extruding) > 861101 Basic Aluminium Products
URI: http://eprints.usq.edu.au/id/eprint/13001

Actions (login required)

View Item Archive Repository Staff Only