Effects of Alloying Elements on Physical and Mechanical Properties of Co-Al-W-Based L12/fcc Two-Phase Alloys

Katsushi Tanaka; Haruyuki Inui

doi:10.4028/www.scientific.net/MSF.783-786.1195

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HomeMaterials Science ForumMaterials Science Forum Vols. 783-786Effects of Alloying Elements on Physical and...

Effects of Alloying Elements on Physical and Mechanical Properties of Co-Al-W-Based L1₂/fcc Two-Phase Alloys

Abstract:

The changes in the γ’ solvus temperature and the volume fraction of Co-Al-W based alloys with fcc / L1₂ two-phase microstructures upon alloying with quaternary elements have been investigated. All investigated quaternary elements, except for Fe and Re, increase the γ’ solvus temperatures of Co-Al-W based alloys with varying efficiencies depending on quaternary element. On the other hand, the variation of the γ’ volume fraction with alloying depends on the alloying element. Of the investigated quaternary elements, Ta is found to be the most effective in increasing the γ’ solvus temperature of Co-Al-W based alloys. The lattice mismatch significantly increase upon alloying with Ta of 4at.%, which destroys the coherent cuboidal structure.

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Materials Science Forum (Volumes 783-786)

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1195-1200

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.783-786.1195

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Online since:

May 2014

Authors:

Katsushi Tanaka, Haruyuki Inui

Keywords:

Cobalt Alloys, Lattice Mismatch, Phase Separation

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