Title

Factors Affecting the Room-Temperature Mechanical Properties of TiCr₂-Base Laves Phase Alloys

Author Info

Katherine C. Chen, California Polytechnic State University - San Luis ObispoFollow
Samuel M. Allen, Massachusetts Institute of Technology
James D. Livingston, Massachusetts Institute of Technology

Recommended Citation

Postprint version. Published in Materials Science and Engineering A, Volume 242, Issue 1-2, February 1, 1998, pages 162-173.

The definitive version is available at https://doi.org/10.1016/S0921-5093(97)00526-1.

Abstract

Various effects on the room-temperature mechanical properties of TiCr₂-base alloys have been assessed in efforts to improve the toughness of Laves phase intermetallics (AB₂). Systematic studies were performed on: (i) single-phase stoichiometric and nonstoichiometric TiCr₂, (ii) TiCr₂-base ternary Laves phases, and (iii) two-phase binary alloys containing TiCr₂. In order to make quantitative comparisons among the different alloys, Vickers indentation was used to obtain hardness and fracture toughness values. Within the single-phase field, constitutional defects accounted for the compositional dependencies of properties, and may aid the synchroshear deformation process. Ternary Laves phases comprised of Fe, Nb, V or Mo additions to TiCr₂ indicated that alloying elements which partition to both A and B sublattices can improve the toughness. Stabilization of the cubic C15 crystal structure also resulted in higher toughness values. Small amounts of the bcc β-phase effectively reduced crack lengths in the Laves phase, and two-phase alloys of (Ti,Cr)+TiCr₂ exhibited significant improvements in toughness.

Disciplines

Materials Science and Engineering