Paper Title:
Microstructural Control of 7075 Al Wrought Alloys through Thixoextrusion Route
  Abstract

Thixoextrusion, one of the thixoforming processes, has advantages of high productivity, reduction of the extrusion pressure, extension of the die life, and cost saving owing to its low energy consumption compared with the conventional extrusion processes. Especially, thixoextrusion process is expected to be very effective for hard-to-form materials with high strength. The present study focuses on 7075 Al wrought alloy to investigate the potential industrial applications of the thixoextrusion process. The microstructural evolution of 7075 Al wrought alloy for thixoextrusion was investigated with respect to isothermal holding temperature and time in the partially remelted semisolid state. The results showed that the liquid fraction increased with increasing isothermal holding temperature and time while the average grain size was inversely proportional to isothermal holding temperature and time up to 5min. However, there was no big change of liquid fraction and average grain size with respect to isothermal holding temperature and time. The important fact that the liquid fraction and average grain size were almost uniform after 5 min holding time is considered very useful for thixoextrusion in terms of process control.

  Info
Periodical
Materials Science Forum (Volumes 510-511)
Edited by
Hyung Sun Kim, Yu Bao Li and Soo Wohn Lee
Pages
362-365
DOI
10.4028/www.scientific.net/MSF.510-511.362
Citation
Y. O. Yoon, H. H. Jo, J. K. Lee, D. I. Jang, S. K. Kim, "Microstructural Control of 7075 Al Wrought Alloys through Thixoextrusion Route", Materials Science Forum, Vols. 510-511, pp. 362-365, 2006
Online since
March 2006
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Price
$32.00
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