Effects of Mo Addition on Deformation Behavior of Metastable Beta-Type Ti-Mn Single Crystals

Abstract:

In this study, to clarify the effects of Mo addition on deformation behavior of Ti-Mn alloys, the mechanical properties and the deformation structures of the alloys were investigated using Ti-Mn and Ti-Mn-Mo alloys polycrystals and single crystals. We found that the elongation of Ti-Mn alloys are improved from approximately 5% to 30% by Mo addition, with maintaining ultimate tensile strength of 900 MPa. The excellent strength-ductility balance of Ti-Mn-Mo alloys is caused by {332}<113> twinning, which is unique twinning for metastable β-type titanium alloys. Additionally, the deformation behavior of Ti-Mn and Ti-Mn-Mo alloys was investigated in detail by using single crystals focusing on a critical resolved shear stress (CRSS). As a result, we found for the first time that CRSS for {332}<113> twinning in Ti-Mn-Mo alloy was lower than that in Ti-Mn alloy. Moreover, in Ti-Mn-Mo alloy, CRSS for {332}<113> twinning was lower than that for {112}<111> slip. These results suggest that CRSS for {332}<113> twinning in Ti-Mn alloys is decreased by Mo addition.

• Periodical: Materials Science Forum (Volume 941)
• Pages: 1360-1365
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.941.1360
• Online since: December 2018
• Authors: Ryota Morioka, Ken Cho, Hiroyuki Y. Yasuda*
• Keywords: Beta-Type Ti Alloy, Critical Resolved Shear Stress, Deformation Behavior, Single Crystal

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