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On the determination of hardness and elastic modulus in BaFe_2As_2 lamellar-like material

机译：BaFe_2As_2层状材料的硬度和弹性模量的测定

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摘要

The mechanical behavior of superconductor lamellar-like BaFe_2As_2 single crystals was investigated at nanoscale by instrumented indentation. The unique responses of the ab- and a(b)c-crystallographic planes were discussed based on their influence in hardness (H) and elastic modulus (E). The results allowed two main conclusions, (ⅰ) The choice of testing parameters strongly affected the scaling of mechanical properties on the lamellar surfaces. Lamellar cracking was the leading mechanism of deformation, featuring a brittle-like behavior and affecting considerably H and E. However, the plastic deformation history allowed different elastic-plastic responses on the ab-plane owing to the compaction of the material. Threshold loads for cracking depended on both loading rate and penetration velocity, pointing out to time-dependent plastic deformation mechanisms, (ⅱ) Proper estimates were achieved for H in multiple loading tests [3.4 GPa for ab- and ～1 GPa for a(b)c-planes], and for E under loads less than 3 mN (～55 GPa for both planes).
机译：通过仪器压痕研究了纳米级BaFe_2As_2超导体层状单晶的力学行为。基于ab和a（b）c晶面对硬度（H）和弹性模量（E）的影响，讨论了它们的独特响应。结果得出两个主要结论：（ⅰ）测试参数的选择强烈影响层状表面上机械性能的缩放。层状裂纹是变形的主要机制，具有类似脆性的行为，并显着影响H和E。但是，由于材料的压实，塑性变形历史允许ab平面上出现不同的弹塑性响应。裂纹的阈值载荷取决于载荷速率和穿透速度，并指出了随时间变化的塑性变形机制，（ⅱ）在多次载荷试验中，H的正确估计值得到了合理的估计[ab（b为3.4 GPa，a（b为〜1 GPa） ）c平面]，对于E负载小于3 mN（两个平面均为〜55 GPa）的情况。

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  • 来源
    《Journal of Materials Research》 |2016年第10期|1413-1422|共10页
  • 作者

    Gelson B. de Souza; Francisco C. Serbena; Alcione R. Jurelo; Simone A. da Silva; Lincoln B.L.G. Pinheiro; Fabio T. Dias; Alexandre Mikowski; Sergey L. Budko; Alex Thaler; Paul C. Canfield;

  • 作者单位

    Universidade Estadual de Ponta Grossa, Department of Physics, 84.030-000, Ponta Grossa, PR, Brazil;

    Universidade Estadual de Ponta Grossa, Department of Physics, 84.030-000, Ponta Grossa, PR, Brazil;

    Universidade Estadual de Ponta Grossa, Department of Physics, 84.030-000, Ponta Grossa, PR, Brazil;

    Universidade Estadual de Ponta Grossa, Department of Physics, 84.030-000, Ponta Grossa, PR, Brazil;

    Institute Federal de Sao Paulo, 13.565-905, Sao Carlos, SP, Brazil;

    Department of Physics, Universidade Federal de Pelotas, 96.010-900, Pelotas, RS, Brazil;

    Universidade Federal de Santa Catarina, 89.218-035, Joinville, SC, Brazil;

    Ames Laboratory, U.S. DOE and Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011;

    Ames Laboratory, U.S. DOE and Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011;

    Ames Laboratory, U.S. DOE and Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011;

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