Deformation behavior of semisolid A356 alloy prepared by low temperature pouring

Ning, Z. L. and Wang, H. and Sun, J. F. (2010) Deformation behavior of semisolid A356 alloy prepared by low temperature pouring. Materials and Manufacturing Processes, 25 (7). pp. 648-653. ISSN 1042-6914

Abstract

The deformation behaviors of A356 alloy with various initial grain structures, from a very coarse dendrite to a fine equiaxed structure, prepared at different pouring temperatures, from 625C to 725 C, were investigated. Cylindrical specimens with 12mm in diameter and 10mm in height were compressed in the semisolid state to a height reduction of 6mm at an initial strain rate of 139 × 10−3/s and then jumped to 139 × 10−2/s. The instantaneous strain rate sensitivity was calculated under iso-structure conditions. Three very different deformation behaviors 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 much higher compression stress. The macrostructural breakage and microstructural segregation of hot compressed samples were analyzed, and the deformation mechanisms were discussed. The low temperature poured material is not sensitive to an instantaneous change in strain rate, while the high temperature poured material is very sensitive.


Statistics for USQ ePrint 18597
Statistics for this ePrint Item
Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: © Taylor & Francis Group, LLC. Permanent restricted access to published version due to publisher copyright restrictions.
Depositing User: Dr Hao Wang
Faculty / Department / School: Historic - Faculty of Engineering and Surveying - Department of Mechanical and Mechatronic Engineering
Date Deposited: 07 Mar 2011 05:21
Last Modified: 05 Aug 2014 02:01
Uncontrolled Keywords: A356 alloy; low temperature pouring; microstructural evolution; semisolid deformation behavior; semisolid metal processing
Fields of Research (FOR2008): 09 Engineering > 0912 Materials Engineering > 091207 Metals and Alloy Materials
01 Mathematical Sciences > 0102 Applied Mathematics > 010207 Theoretical and Applied Mechanics
Socio-Economic Objective (SEO2008): E Expanding Knowledge > 97 Expanding Knowledge > 970109 Expanding Knowledge in Engineering
Identification Number or DOI: 10.1080/10426910903447279
URI: http://eprints.usq.edu.au/id/eprint/18597

Actions (login required)

View Item Archive Repository Staff Only