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李阳,孙红亮,杨康,邓鹏,陈志元.Y参杂对真空热压烧结TiAl基合金显微组织和力学性能的影响[J].稀有金属材料与工程(英文),2019,48(6):1756~1761.[Li Yang,Sun Hongliang,Yang Kang,Deng Peng and 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.]
Effect of Y doping and vacuum hot-press sintering on the microstructure and mechanical properties of TiAl-based alloys
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Received:January 27, 2018  Revised:May 11, 2019
DOI:
Key words: Vacuum hot pressing  Y doping  Microstructure  Mechanical properties
Foundation item:国家科技攻关计划
Author NameAffiliation
Li Yang,Sun Hongliang,Yang Kang,Deng Peng and Chen Zhiyuan  
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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.