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Indentification of microstructural evolution mechanisms of TiAl based alloy prepared by spark plasma sintering
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NationalNaturalScienceFoundation of China (No. 51504191, 51671152); NaturalScienceFoundation of Shaanxi Province of China (No. 2014JM6229); NaturalScienceFoundation of Shaanxi Province Department of Education of China ( No.14JK1512); Foundation of Xi"an Technology Bureau Research Projects ( CXY1438(5)); Fundamental Research Funds for the Central Universities of Ministry of Education of China ( No. 31083216100); State key laboratory of powder metallurgy open issue;

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    Abstract:

    This work aims at identifying, by coupled X-Ray diffraction, scanning and transmission electron microscopy (XRD, SEM and TEM) observations, the microstructural evolution mechanisms occuring when an atomized Ti-47Al-2Cr-2Nb-0.2W powder is densified by spark plasma sintering (SPS). For this purpose, interruptions of the SPS cycle have been performed to follow the evolution of the microstricture step by step. During heating-up, the microstructure undergoes successive transformations. At begaining temperature of 1100℃ the α phase transforms into γ and residual B2. The γ phase formed is supersaturated in W. At temperature above 1200℃, TEM observations show that the repartition of the plastic dedormation is correlated to the dendritic microstructure, and the deformation induced α2 →γ phase transformation and the twins.

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[Yang Xin, kang xinting. Indentification of microstructural evolution mechanisms of TiAl based alloy prepared by spark plasma sintering[J]. Rare Metal Materials and Engineering,2019,48(9):2994~3000.]
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History
  • Received:March 28,2017
  • Revised:April 01,2019
  • Adopted:July 02,2019
  • Online: October 09,2019
  • Published: