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首页> 外文期刊>Materials Science and Engineering >Effects of extrusion ratio on microstructural evolution and mechanical behavior of in situ synthesized Ti-6Al-4V composites
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Effects of extrusion ratio on microstructural evolution and mechanical behavior of in situ synthesized Ti-6Al-4V composites

机译：挤压比对原位合成Ti-6Al-4V复合材料组织演变和力学性能的影响

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摘要

TiB whiskers and TiC particles reinforced Ti-6Al-4V composites (TMCs) were synthesized by in situ method and then extruded with different extrusion ratios (λ=7, 10 and 16) at 1258 K. The effects of extrusion ratio on the microstructural evolution and mechanical behavior have been systematically investigated. The room temperature tensile results indicate that the strength, elastic modulus and ductility of the TMCs are simultaneous to be improved after extrusion. With the increase of extrusion ratio, the yield strength of the TMCs increases and the fracture strain of the TMCs decreases, respectively. Meanwhile, the elastic modulus almost keeps as a constant during the extrusion process. The mechanical properties of the TMCs are found to be determined by the interplay of reinforcements and the metal matrix. With the increase of extrusion ratio, the aspect ratio of TiB whiskers decreases from ～4.3 to ～3.5. Nevertheless, the volume fraction of dynamic recrystallization of the matrix shows positive correlation with the extrusion ratio. It is up to about 72% of dynamic recrystallized grains at the extrusion ratio of 16. EBSD and TEM observations are used to study the texture evolution during extrusion process, which indicate that the type of the deformation texture is similar with the recrystallization texture, while its intensity is higher than the latter one.
机译：用原位合成TiB晶须和TiC颗粒增强的Ti-6Al-4V复合材料（TMCs），然后在1258 K下以不同的挤出比（λ= 7、10和16）进行挤出。挤出比对组织演变的影响和力学行为已得到系统地研究。室温拉伸结果表明，TMC的强度，弹性模量和延展性在挤出后同时得到改善。随着挤压比的增加，TMC的屈服强度增加，而TMC的断裂应变减小。同时，弹性模量在挤出过程中几乎保持恒定。发现TMC的机械性能由增强材料和金属基质的相互作用决定。随着挤压比的增加，TiB晶须的长径比从〜4.3降低到〜3.5。然而，基体的动态再结晶的体积分数与挤出率显示出正相关。在挤压比为16时，动态再结晶晶粒的含量约为72％。EBSD和TEM观察用于研究挤压过程中的织构演变，这表明变形织构的类型与再结晶织构相似，而其强度高于后一种。

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  • 来源
    《Materials Science and Engineering》 |2017年第14期|155-163|共9页
  • 作者

    Guangfa Huang; Yuanfei Han; Xianglong Guo; Di Qiu; Iiqiang Wang; Weijie Lu; Di Zhang;

  • 作者单位

    State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai 200240, PR China;

    State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai 200240, PR China;

    State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai 200240, PR China,School of Nuclear Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, PR China;

    State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai 200240, PR China;

    State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai 200240, PR China;

    State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai 200240, PR China;

    State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai 200240, PR 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; Extrusion; Dynamic recrystallization; Texture; Tensile properties;

    机译：钛基复合材料;挤压;动态重结晶;质地;拉伸性能;

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