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In-situ neutron diffraction study of phase stability and equilibria in the Ti-rich part of the Ti¿Al binary system

Journal Article


Abstract


  • Three alloys with composition range of Ti-(25–35)Al (atomic %) were in-situ investigated using neutron diffraction to clarify the phase stability and equilibria in the Ti-rich part of the Ti–Al binary system. The phase transformation sequences of these three alloys were identified based on the neutron diffraction results and differential scanning calorimetry. No superstructure diffraction of β0 has been found in the neutron diffraction patterns. It is concluded that the β0 phase in the examined composition range is thermodynamically unstable. Based on the phase transformation sequences of these three alloys, combining the characters of congruent type relationship and peritectoid type relationship, the phase equilibria among β, α and α2 phases were confirmed as a peritectoid type, with two peritectoid reactions, i.e., β+α→α2 and β +α2→α.

Publication Date


  • 2020

Citation


  • Xu, S., Reid, M., Liss, K. D., Xu, Y., Zhang, H., He, J., & Lin, J. (2020). In-situ neutron diffraction study of phase stability and equilibria in the Ti-rich part of the Ti¿Al binary system. Intermetallics, 120. doi:10.1016/j.intermet.2020.106761

Scopus Eid


  • 2-s2.0-85080039760

Web Of Science Accession Number


Volume


  • 120

Abstract


  • Three alloys with composition range of Ti-(25–35)Al (atomic %) were in-situ investigated using neutron diffraction to clarify the phase stability and equilibria in the Ti-rich part of the Ti–Al binary system. The phase transformation sequences of these three alloys were identified based on the neutron diffraction results and differential scanning calorimetry. No superstructure diffraction of β0 has been found in the neutron diffraction patterns. It is concluded that the β0 phase in the examined composition range is thermodynamically unstable. Based on the phase transformation sequences of these three alloys, combining the characters of congruent type relationship and peritectoid type relationship, the phase equilibria among β, α and α2 phases were confirmed as a peritectoid type, with two peritectoid reactions, i.e., β+α→α2 and β +α2→α.

Publication Date


  • 2020

Citation


  • Xu, S., Reid, M., Liss, K. D., Xu, Y., Zhang, H., He, J., & Lin, J. (2020). In-situ neutron diffraction study of phase stability and equilibria in the Ti-rich part of the Ti¿Al binary system. Intermetallics, 120. doi:10.1016/j.intermet.2020.106761

Scopus Eid


  • 2-s2.0-85080039760

Web Of Science Accession Number


Volume


  • 120