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首页> 外文期刊>Materials Science and Engineering >Effects of pre-sintering on microstructure and properties of TiBw/Ti6Al4V composites fabricated by hot extrusion with steel cup
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Effects of pre-sintering on microstructure and properties of TiBw/Ti6Al4V composites fabricated by hot extrusion with steel cup

机译：预烧结对钢杯热挤压TiBw / Ti6Al4V复合材料组织和性能的影响

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摘要

In situ synthesized TiB whisker reinforced 3.5 vol% TiBw/Ti6Al4V composites have been synthesized by pre-sintering and hot extrusion with steel cup processes. The effects of pre-sintering temperature and time on densification behavior and mechanical properties of the as-extruded composites were investigated. The results indicated that as-extruded TiBw/Ti64 composite sintered at 1100 ℃ had the highest relative density of 99.4% along with ultimate tensile strength of 1352 MPa and elongation of 4.72%. With increasing pre-sintering temperature from 900 to 1100 ℃, the in situ synthesized TiB whiskers which construct a quasi-continuous network microstructure produced by pre-sintering and hot extrusion techniques grow rapidly, while the relative density of the composites increases obviously. At the same time, the fracture type changes from brittle fracture to the hybrid-fracture characteristic of plastic fracture and brittle fracture. The strengthening effects can attribute to the matrix refine and the in-situ reaction TiB whiskers reinforcement due to pre-sintering and hot extrusion plastic deformation. The results also suggest that the optimal pre-sintering and hot extrusion with steel cup techniques are sintered at 1100 ℃ for 1 h in consideration of the comprehensive properties and the cost.
机译：原位合成的TiB晶须增强的3.5％（体积）TiBw / Ti6Al4V复合材料是通过预烧结和钢杯热挤压工艺合成的。研究了预烧结温度和时间对挤出复合材料致密化行为和力学性能的影响。结果表明，在1100℃烧结的TiBw / Ti64复合材料的最高相对密度为99.4％，极限抗拉强度为1352 MPa，伸长率为4.72％。随着预烧结温度从900℃升高到1100℃，通过预烧结和热挤压技术制备的准连续网络微观结构的原位合成TiB晶须生长迅速，而复合材料的相对密度明显增加。同时，断裂类型从脆性断裂变为塑性断裂和脆性断裂的混合断裂特征。强化效果可归因于预烧结和热挤压塑性变形引起的基体细化和原位反应TiB晶须增强。结果还表明，考虑到综合性能和成本，采用钢杯技术的最佳预烧结和热挤压应在1100℃下烧结1 h。

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  • 来源
    《Materials Science and Engineering》 |2015年第25期|38-45|共8页
  • 作者

    Yang Yu; Wencong Zhang; Wenqian Dong; Jianlei Yang; Yangju Feng;

  • 作者单位

    School of Materials Science and Engineering, Harbin Institute of Technology at Weihai, No. 2, West Wenhua Road, Weihai 264209, Shandong Province, China;

    School of Materials Science and Engineering, Harbin Institute of Technology at Weihai, No. 2, West Wenhua Road, Weihai 264209, Shandong Province, China;

    Shanghai Spaceflight Precision Machinery Institute, No. Ⅰ, Guide Road, Songjiang District, Shanghai 201600, China;

    School of Materials Science and Engineering, Harbin Institute of Technology at Weihai, No. 2, West Wenhua Road, Weihai 264209, Shandong Province, China;

    School of Materials Science and Engineering, Harbin Institute of Technology at Weihai, No. 2, West Wenhua Road, Weihai 264209, Shandong Province, China;

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  • 正文语种 eng
  • 中图分类
  • 关键词

    Titanium matrix composites (TMCs); Pre-sintering; Hot extrusion; Microstructure; Mechanical properties;

    机译：钛基复合材料（TMC）;预烧结;热挤压;微观结构机械性能;

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