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Microcompression tests of single-crystalline and ultrafine grain Bi_2Te_3 thermoelectric material

机译：单晶和超细晶粒Bi_2Te_3热电材料的微压缩试验

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摘要

Highly textured, ultrafine grain pure Bi_2Te_3 has been obtained by applying large-strain high-pressure torsion (HPT) to hot-pressed (HP) coarse grain material. Its thermal conductivity is significantly smaller than the conductivity of HP Bi_2Te_3, and its crystallographic texture and mechanical properties significantly improved. The mechanical properties of both, coarse grain and ultrafine grain, samples have been assessed by compression tests of 2 μm diameter micropillars machined by focused ion beam. The micropillars built from coarse grain samples are single crystalline, those built from ultrafine grain materials are an order of magnitude larger than their grain size. The test results put in evidence the elastic and plastic anisotropy of Bi_2Te_3 and the significant strengthening and toughening effect of ultrafine grain refining. For instance, after an equivalent strain of about 100, the Vickers hardness (in kg mm~(-2)) increases from 60 to 120. Simultaneously, about a 40% reduction of the thermal conductivity has been measured, and a very strong basal texture is developed normal to the torsion axis. Such combination of properties looks very promising for simultaneously enhancing the thermoelectric figure of merit and the mechanical reliability of Bi_2Te_3-based alloys through HPT processing.
机译：通过对热压（HP）粗粒材料施加大应变高压扭力（HPT），可以获得高织构的超细晶粒纯Bi_2Te_3。其热导率明显小于HP Bi_2Te_3的电导率，并且其晶体学织构和机械性能得到显着改善。粗颗粒和超细颗粒的机械性能均已通过聚焦离子束加工的2μm直径微柱的压缩测试进行了评估。用粗颗粒样品制成的微柱是单晶的，用超细颗粒材料制成的微柱比其晶粒大一个数量级。试验结果表明，Bi_2Te_3的弹性和塑性各向异性以及超细晶粒细化的显着增强和增韧作用。例如，在大约100的等效应变之后，维氏硬度（以kg mm〜（-2）为单位）从60增加到120。同时，已测量出热导率降低了约40％，并且非常坚固的基础垂直于扭转轴形成纹理。这种性能的组合对于通过HPT处理同时提高Bi_2Te_3基合金的热电性能和机械可靠性非常有前途。

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  • 来源
    《Journal of Materials Research》 |2015年第17期|2593-2604|共12页
  • 作者

    Jon Ander Santamaria; Jon Alkorta; Javier Gil Sevillano;

  • 作者单位

    CEIT and TECNUN, Universidad de Navarra M. de Lardizabal, 20018 San Sebastidn, Spain;

    CEIT and TECNUN, Universidad de Navarra M. de Lardizabal, 20018 San Sebastidn, Spain;

    CEIT and TECNUN, Universidad de Navarra M. de Lardizabal, 20018 San Sebastidn, Spain;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
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  • 正文语种 eng
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