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Superplastic deformation behavior of carbon nanotube reinforced 7055 Al alloy composites

机译：碳纳米管增强7055 Al合金复合材料的超塑性变形特性

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摘要

The superplastic deformation behavior of a carbon nanotube reinforced high-strength aluminium alloy matrix composite (CNT/7055A1) was investigated at temperatures ranging from 300 to 425 °C and strain rates ranging from 10~(-2) to 5 s~(-1). A maximum elongation of 125% was observed for the as-extruded CNT/7055A1 at 400 °C and a high strain rate of 5 s~(-1). After a T6 treatment (solution and artificial aging treatment), the CNT/7055A1 achieved a higher elongation of 153% at 400 °C and 5 s~(-1) due to the fewer second-phase particles. The strain rate sensitivity and activation energy were determined to be 0.2 and 171 kJ/mol, respectively. Combined with microstructural observation, it was demonstrated that the main deformation mechanism for the CNT/7055A1 was lattice diffusion controlled dislocation climb. Further, it was found that CNTs played a negative role in the superplastic deformation, which could be attributed to the large aspect ratio of CNTs and strong CNT-A1 interface bonding.
机译：在从300至425℃的温度范围内研究碳纳米管增强高强度铝合金基质复合物（CNT / 7055A1）的超塑性变形行为，其应变率从10〜（-2）至5 s〜（-1 ）。在400℃下以400℃和5 s〜（-1）的高应变率，观察到最大125％的125％伸长率。在T6处理（溶液和人工老化处理）之后，CNT / 7055A1由于较少的第二相颗粒，CNT / 7055A1在400℃和5S〜（-1）中达到了153％的较高伸长率。将应变率灵敏度和活化能量分别测定为0.2和171kJ / mol。结合微观结构观察，证明CNT / 7055A1的主要变形机制是晶格扩散控制位错爬升。此外，发现CNT在超塑性变形中发挥了负面作用，这可能归因于CNT和强CNT-A1接口键合的大纵横比。

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  • 来源
    《Materials Science and Engineering》 |2020年第21期|140263.1-140263.9|共9页
  • 作者

    S. Bi; Z.Y. Liu; B.H. Yu; G.N. Ma; L.H. Wu; B.L. Xiao; Z.Y. Ma;

  • 作者单位

    Institute of Metal Research Chinese Academy of Sciences 72 Wenhua Road Shenyang 110016 China University of Science and Technology of China School of Material Science and Engineering 72 Wenhua Road Shenyang 110016 China;

    Institute of Metal Research Chinese Academy of Sciences 72 Wenhua Road Shenyang 110016 China;

    Institute of Metal Research Chinese Academy of Sciences 72 Wenhua Road Shenyang 110016 China;

    Institute of Metal Research Chinese Academy of Sciences 72 Wenhua Road Shenyang 110016 China University of Science and Technology of China School of Material Science and Engineering 72 Wenhua Road Shenyang 110016 China;

    Institute of Metal Research Chinese Academy of Sciences 72 Wenhua Road Shenyang 110016 China;

    Institute of Metal Research Chinese Academy of Sciences 72 Wenhua Road Shenyang 110016 China;

    Institute of Metal Research Chinese Academy of Sciences 72 Wenhua Road Shenyang 110016 China;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    Superplasticity; Carbon nanotubes; Aluminium matrix composites; High strain rate; Deformation mechanism;

    机译：超塑性;碳纳米管;铝基矩阵复合材料;高应变率;变形机制;

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