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首页> 外文期刊>Solid state sciences >Equal channel angular extrusion: An effective method to refine the microstructure of cast n-type Bi2Te3 based ingot to co-optimize thermoelectric and mechanical properties
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Equal channel angular extrusion: An effective method to refine the microstructure of cast n-type Bi2Te3 based ingot to co-optimize thermoelectric and mechanical properties

机译：相等的沟道角挤压：一种优化基于铸造N型Bi2te3的微观结构的有效方法，以共同优化热电和机械性能

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摘要

Although the mechanical strength of n-type polycrystalline Bi2Te3 based alloys prepared by conventional powder metallurgy technology is good, its thermoelectric properties have poor repeatability and contamination is introduced. In this work, n-type polycrystalline Bi2Te3 based alloys with uniform microstructure were fabricated by applying equal channel angular extrusion (ECAE) method to extrude the cast ingot directly for four passes at 783 K. The initial lamellae coarse grains with hundreds of microns were broken down efficiently and refined uniformly to only 10-20 mu m. And the Vickers hardness was increased by 2.3 times due to the refined grains. On the other hand, it is noteworthy that the ECAE process is also an ideal method to improve the thermoelectric properties of cast ingot by boosting electrical transport properties due to the donor like effect induced by heavy deformation and reducing thermal transport properties due to the enhanced phonon scattering. In order to further optimize the thermoelectric performance, BiCl3 doping was used to precisely tune the carrier concentration to the best range. The intrinsic excitation temperature of Bi2Te3 based alloys gradually shifted from low temperature (below 30310 to high temperature (463 K) owing to the increased carrier concentration. Finally, the extruded Bi2Te3 based alloy doped with 0.064 wt % BiCl3 obtained the maximum dimensionless figure of merit (ZT) of 0.68 at 423 K, which was far higher than the nearly zero of the initial cast ingot.
机译：虽然通过常规粉末冶金技术制备的N型多晶硅Bi2Te3基合金的机械强度良好，但其热电性能具有差的可重复性和污染。在这项工作中，通过施加等通道角挤出（ECAE）方法将具有均匀微观结构的N型多晶Bi2Te3基于均匀微观结构的合金直接挤出铸锭，在783k下直接挤出四次通过。初始薄片粗粒含有数百微米的粗粒高效并均匀地精制到仅10-20亩。由于精制的谷物，维氏硬度增加了2.3倍。另一方面，值得注意的是，ECAE过程也是通过促进由于重型变形引起的施用而引起的施用而通过促进电气传输性能来提高铸锭的热电性能，并通过增强的声子降低热传输性能，以提高电力传输性能散射。为了进一步优化热电性能，使用BICL3掺杂来精确地将载流子浓度调节到最佳范围。基于Bi2Te3的合金的内在激发温度逐渐从低温（低于30310至高温（463k）而导致的载体浓度。最后，掺杂掺杂的挤出的Bi2Te3基合金为0.064wt％BiCl3获得了最大无量纲的优点（Zt）为0.68，423 k，远高于初始铸锭的近零。

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  • 来源
    《Solid state sciences》 |2020年第1期|共7页
  • 作者

    Hu Xiaoming; Fan Xian; Feng Bo; Kong Dong; Liu Peihai; Li Rusong; Zhang Yanglin; Li Guangqiang; Li Yawei;

  • 作者单位

    Wuhan Univ Sci &

    Technol State Key Lab Refractories &

    Met Wuhan 430081 Peoples R China;

    Wuhan Univ Sci &

    Technol State Key Lab Refractories &

    Met Wuhan 430081 Peoples R China;

    Wuhan Univ Sci &

    Technol State Key Lab Refractories &

    Met Wuhan 430081 Peoples R China;

    Wuhan Univ Sci &

    Technol State Key Lab Refractories &

    Met Wuhan 430081 Peoples R China;

    Wuhan Univ Sci &

    Technol State Key Lab Refractories &

    Met Wuhan 430081 Peoples R China;

    Wuhan Univ Sci &

    Technol State Key Lab Refractories &

    Met Wuhan 430081 Peoples R China;

    Wuhan Univ Sci &

    Technol State Key Lab Refractories &

    Met Wuhan 430081 Peoples R China;

    Wuhan Univ Sci &

    Technol State Key Lab Refractories &

    Met Wuhan 430081 Peoples R China;

    Wuhan Univ Sci &

    Technol State Key Lab Refractories &

    Met Wuhan 430081 Peoples R China;

  • 收录信息
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 化学;固体物理学;
  • 关键词

    Thermoelectric materials; Bi2Te3; Equal channel angular extrusion; Grain refinement; Point defects;

    机译：热电材料;Bi2te3;等沟角挤出;晶粒细化;点缺陷;

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