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Gradient grain distribution and enhanced properties of novel laminated Ti-TiBw/Ti composites by reaction hot-pressing

机译:反应热压新型Ti-TiBw / Ti层合复合材料的梯度晶粒分布和增强性能

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摘要

A novel laminated Ti-TiBw/Ti composite containing Ti layers and TiBw/Ti composite layers were successfully fabricated by the reaction hot-pressing technique. The TiB whiskers and their network distribution structure play an effective role in microstructural evolution of the Ti matrix during the sintering and cooling processes. Interestingly, the morphology and size of grains in the laminated Ti-TiBw/Ti composites exhibit gradient distribution. The Ti layer comprises coarse lath-like grains while the TiBw/Ti composite layer contains two different sizes of equiaxed grains. A combination of high strength and ductility can be obtained by incorporating a low volume fraction of in-situ TiBw through the grain refinement mechanism and the laminated structure. The TiBw/Ti composite layer with high strain hardening rate delays localized necking of the Ti layer. The novel laminated structure of Ti-TiBw/Ti composite allocates stress and strain reasonably well and reveals a prolonged uniform plastic deformation capability.
机译:通过反应热压技术成功地制备了包含Ti层和TiBw / Ti复合层的新型叠层Ti-TiBw / Ti复合材料。 TiB晶须及其网络分布结构在烧结和冷却过程中对Ti基体的微观结构演变起有效作用。有趣的是,叠层Ti-TiBw / Ti复合材料中晶粒的形态和尺寸表现出梯度分布。 Ti层包含粗的板条状晶粒,而TiBw / Ti复合层包含两种不同尺寸的等轴晶粒。通过晶粒细化机制和层状结构掺入低体积分数的原位TiBw,可以获得高强度和延展性的结合。具有高应变硬化速率的TiBw / Ti复合层延迟了Ti层的局部缩颈。 Ti-TiBw / Ti复合材料的新型层状结构合理地分配了应力和应变,并显示出持久的均匀塑性变形能力。

著录项

  • 来源
    《Materials Science and Engineering》 |2014年第10期|257-265|共9页
  • 作者单位

    School of Materials Science and Engineering, Harbin Institute of Technology, P.O. Box 433, Harbin 150001, China;

    School of Materials Science and Engineering, Harbin Institute of Technology, P.O. Box 433, Harbin 150001, China;

    School of Materials Science and Engineering, Harbin Institute of Technology, P.O. Box 433, Harbin 150001, China;

    School of Materials Science and Engineering, Harbin Institute of Technology, P.O. Box 433, Harbin 150001, China;

    School of Materials Science and Engineering, Harbin Institute of Technology, P.O. Box 433, Harbin 150001, China;

    School of Materials Science and Engineering, Harbin Institute of Technology, P.O. Box 433, Harbin 150001, China;

    School of Materials Science and Engineering, Harbin Institute of Technology, P.O. Box 433, Harbin 150001, China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Titanium matrix composites; Laminated microstructure; Gradient distribution; Localized necking; Uniform plastic deformation;

    机译:钛基复合材料;层状微结构;梯度分布;局部颈缩;均匀塑性变形;

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