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Processing and characterization of in-situ TiB<inf>2</inf> stabilized closed cell aluminium alloy composite foams
Date Issued
05-07-2016
Author(s)
Atturan, U. Athul
Nandam, Sree Harsha
Murty, B. S.
Indian Institute of Technology, Madras
Abstract
A357 (Al–7Si–0.6Mg)-xTiB2 (x = 5, 10 wt.%) in-situ composites processed by the salt-melt reaction method were successfully foamed by melt processing with the addition of heat treated TiH2 as blowing agent. Holding time was varied in order to identify critical holding time beyond which cell wall collapse and drainage dominate. X-ray tomography was employed to characterize the geometric structure of cells. Cell structure with high degree of uniformity evolved in 5TiB2 composite foams compared with 10TiB2 composite foams for a given holding time. 5TiB2 composite foams showed better expansion compared to 10TiB2 composite foams. However, the number of cell wall remnants (defects) was more for highly expanded 5TiB2 composite foams. TiB2 particles present in the foam promoted foam stability.
Volume
101