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Alloying Effects on the Phase Transformation Behaviors of the Orthorhombic and Ordered ω Phases in High Nb – TiAl Alloys
Author(s) -
Hu Xingguo,
Li Jinshan,
Song Lin,
Zhang Tiebang,
Kou Hongchao
Publication year - 2017
Publication title -
advanced engineering materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.938
H-Index - 114
eISSN - 1527-2648
pISSN - 1438-1656
DOI - 10.1002/adem.201700040
Subject(s) - orthorhombic crystal system , materials science , phase (matter) , alloy , crystallography , metallurgy , crystal structure , chemistry , organic chemistry
In this work, alloying effects of Mn, Mo, and Cr on the phase transformation behaviors of the orthorhombic and ordered ω phases in high Nb–TiAl are investigated. Modulated structures are observed in the Mn and Mo‐containing alloys indicating that Mn and Mo cannot hinder the formation of the orthorhombic phase while Cr hinders the formation of the orthorhombic phase completely. For the ordered ω phases, small ordered ω particles are observed in the Mn‐containing alloy. Though Mn cannot hinder the formation of the ordered ω phases, the formation temperature of which is decreased to 600 °C. No ordered ω phases are observed in the Mo and Cr‐containing alloys. Two percent of Mo and Cr hinder the formation of the ordered ω phases completely. The stabilization effect of Mn, Mo, and Cr on βo phase is mainly a thermodynamic effect.