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,2019,48(6):1756~1761.[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.]
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
投稿时间:2018-01-27  修订日期:2019-05-11
中文关键词:  真空热压烧结、Y参杂、显微组织、力学性能
基金项目:国家科技攻关计划
中文摘要:
      Ti-45Al (at %)和Ti-45Al-0.3Y (at %)样品通过真空热压烧结的方法制备。样品通过x射线衍射(XRD)、光学显微镜(OM)、背散射电子(BSE)以及压缩和硬度测试来研究Y参杂和热压工艺参数对TIAl基合金的显微组织和力学性能的影响。最优烧结参数为压力42MPa,在1400℃下保温保压90分钟。在此参数下,得到了组织均匀、晶粒细小的由γ相和γ+α2片层结构组成的双态组织。在热压温度1400℃,保温时间240分钟下,反应能完全达到,但会出现晶粒粗大现象。Y的加入对细化晶粒和片层间距有明显的作用,这有助于提高合金的机械强度。
Effect of Y doping and vacuum hot-press sintering on the microstructure and mechanical properties of TiAl-based alloys
英文关键词:Vacuum hot pressing  Y doping  Microstructure  Mechanical properties
英文摘要:
      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.
作者单位E-mail
李阳 西南交通大学材料科学与工程学院 1354944342@qq.com 
孙红亮 西南交通大学材料科学与工程学院 sunhlcd@163.com 
杨康 西南交通大学材料科学与工程学院 2318500583@qq.com 
邓鹏 西南交通大学材料科学与工程学院 554175989@qq.com 
陈志元 西南交通大学材料科学与工程学院 1032043639@qq.com 
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