|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||GAT-2017 (Gamma Alloys Technology - 2017)
||Determination of the Isothermal Sections of the Ti-Al-Nb Ternary System at 1300 ˚C and 1400 ˚C
||Shuai Xu, Yong Xu, Xiangjun Xu, Jianping He, Yongfeng Liang, Junpin Lin
|On-Site Speaker (Planned)
The phase equilibria in the Ti-Al-Nb ternary system was investigated by a combination of scanning electron microscopy (SEM), powder X-ray diffraction (XRD) and electron probe micro analysis (EPMA). Isothermal sections at 1300 ˚C and 1400 ˚C were constructed based on experimental data from 90 quenched alloys. The phase equilibria among the following intermetallics and solid-solution phases are described: γ-TiAl, β, α, σ-Nb<SUB>2</SUB>Al, δ-Nb<SUB>3</SUB>Al and ε-(Ti<SUB>1-x</SUB>Nb<SUB>x</SUB>)Al<SUB>3</SUB>. The range of α, σ and β phases expand and the range of γ and ε phases shrink comparing with the calculated results. With the increase of temperature, the site of the tie-triangle of α+β+γ moves to higher Nb content, which is different with the calculated results. The range of the tie-triangle of σ+β+γ is also different with the calculated results.
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