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Effect of Y doping and vacuum hot-press sintering on the microstructure and mechanical properties of TiAl-based alloys
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School of Materials Science and Engineering, Southwest Jiaotong University,

Clc Number:

TG 金属学、金属工艺

Fund Project:

The National Key Technologies R&D Program of China

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    Abstract:

    Ti-45Al (at %) and Ti-45Al-0.3Y (at %) samples were fabricated by vacuum hot-press sintering (VHPS). The influence of Y additions and VHPS process parameters on the microstructure and mechanical properties of TiAl-based alloys were analyzed using x-ray diffraction (XRD), optical microscopy (OM), back-scattered electron (BSE) imaging, compression and hardness testing. Optimized sintering parameters were 42 MPa at 1400℃ with holding time of 90 minutes. Samples prepared under these conditions had uniform and fine grains with a duplex microstructure which consisted of γ phase and γ+α2 lamellar colonies. The reaction between γ-TiAl and α2-Ti3Al reached completion at a hot-press temperature of 1400℃ and holding time of 240 minutes. Unfortunately, significant grain growth occurred under these conditions. The addition of Y had an obvious effect on grain and interlamellar spacing refinement contributing to an increased mechanical strength of the alloy.

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[Li Yang, Sun Hongliang, Yang Kang, Deng Peng, Chen Zhiyuan. Effect of Y doping and vacuum hot-press sintering on the microstructure and mechanical properties of TiAl-based alloys[J]. Rare Metal Materials and Engineering,2019,48(6):1756~1761.]
DOI:10.12442/j. issn.1002-185X.20180108

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History
  • Received:January 27,2018
  • Revised:May 11,2019
  • Adopted:June 15,2018
  • Online: July 30,2019
  • Published: