Creep Properties of .ALPHA.+.ALPHA.2 High Temperature Titanium Alloys Designed by the Aid of Thermodynamics.

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概要

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• Effects of the microstructural and compositional factors on creep properties of α+α2 titanium alloys were examined using ten Ti-Al-Sn-Zr alloys designed by the thermodynamic calculations based on the sublattice model. From creep tests for these alloys, it was made clear that the α2 precipitates would be very effective for improving high temperature strength of the α phase titanium alloys. Regression equations to predict creep properties were obtained by multiple regression analysis.In the furnace cooled (FC) condition, a remarkable decrease in the elongation was observed at around the calculated Vα2 of 0.1 (at 873 K) in room temperature tensile tests. On the other hand, the 0.2% proof stress and the tensile strength increased with increasing Vα2 and good ductility was observed in the solution treated (ST) condition showing applicability of this type of alloys in the ST condition. From these results, the Vα2 of about 0.1 (at 873 K) was proposed as the best design condition for α+α2 high temperature titanium alloys.

• The Iron and Steel Institute of Japanの論文

著者

• Yamazaki Michio

  Materials Design Division, National Research Institute for Metals

関連論文

• Creep Properties of .ALPHA.+.ALPHA.2 High Temperature Titanium Alloys Designed by the Aid of Thermodynamics.

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