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Factors Affecting the Room-Temperature Mechanical Properties of TiCr2-Base Laves Phase Alloys
Materials Science and Engineering A
  • Katherine C. Chen, California Polytechnic State University - San Luis Obispo
  • Samuel M. Allen, Massachusetts Institute of Technology
  • James D. Livingston, Massachusetts Institute of Technology
Publication Date
2-1-1998
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.

Citation Information
Katherine C. Chen, Samuel M. Allen and James D. Livingston. "Factors Affecting the Room-Temperature Mechanical Properties of TiCr2-Base Laves Phase Alloys" Materials Science and Engineering A Vol. 242 Iss. 1-2 (1998) p. 162 - 173
Available at: http://works.bepress.com/kcchen/27/