Paper Title:
Thermodynamic Calculation of Alpha-Case Formation in Titanium Alloys
  Abstract

The alpha-case formation mechanism was elucidated for the economic titanium casting. The α-case formation reaction between Ti and Al2O3 mold was examined in a plasma arc melting furnace. The reaction products were characterized by electron probe micro-analyzer and transmission electron microscopy. The α-case generation between Ti and Al2O3 mold was not able to be explained by the conventional α-case formation mechanism, which is known to be formed by the interstitials, especially oxygen dissolved from mold materials. However, from our experimental results and thermodynamic calculations and Calphad modeling (Thermo-calc®), it was confirmed that the α-case is formed not only by an interstitial element but also by substitutional metallic elements dissolved from mold materials. Our newly established α-case formation mechanism will surely lead to a variety of significant applications of the α-case controlled Ti casting.

  Info
Periodical
Advanced Materials Research (Volumes 26-28)
Edited by
Young Won Chang, Nack J. Kim and Chong Soo Lee
Pages
519-522
DOI
10.4028/www.scientific.net/AMR.26-28.519
Citation
S. Y. Sung, B. J. Choi, S. H. Noh, C. S. Hahn, Y. M. Ryu, B. S. Han, Y. J. Kim, "Thermodynamic Calculation of Alpha-Case Formation in Titanium Alloys", Advanced Materials Research, Vols. 26-28, pp. 519-522, 2007
Online since
October 2007
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$32.00
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