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On the determination of hardness and elastic modulus in BaFe2As2 lamellar-like material

Published online by Cambridge University Press:  10 May 2016

Gelson B. de Souza ,
Francisco C. Serbena ,
Alcione R. Jurelo ,
Simone A. da Silva ,
Lincoln B.L.G. Pinheiro ,
Fábio T. Dias ,
Alexandre Mikowski ,
Sergey L. Bud'ko ,
Alex Thaler  and
Paul C. Canfield
Gelson B. de Souza*
Affiliation:
Universidade Estadual de Ponta Grossa, Department of Physics, 84.030-000, Ponta Grossa, PR, Brazil
Francisco C. Serbena
Affiliation:
Universidade Estadual de Ponta Grossa, Department of Physics, 84.030-000, Ponta Grossa, PR, Brazil
Alcione R. Jurelo
Affiliation:
Universidade Estadual de Ponta Grossa, Department of Physics, 84.030-000, Ponta Grossa, PR, Brazil
Simone A. da Silva
Affiliation:
Universidade Estadual de Ponta Grossa, Department of Physics, 84.030-000, Ponta Grossa, PR, Brazil
Lincoln B.L.G. Pinheiro
Affiliation:
Instituto Federal de São Paulo, 13.565-905, São Carlos, SP, Brazil
Fábio T. Dias
Affiliation:
Department of Physics, Universidade Federal de Pelotas, 96.010-900, Pelotas, RS, Brazil
Alexandre Mikowski
Affiliation:
Universidade Federal de Santa Catarina, 89.218-035, Joinville, SC, Brazil
Sergey L. Bud'ko
Affiliation:
Ames Laboratory, U.S. DOE and Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011
Alex Thaler
Affiliation:
Ames Laboratory, U.S. DOE and Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011
Paul C. Canfield
Affiliation:
Ames Laboratory, U.S. DOE and Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011
*
a)Address all correspondence to this author. e-mail: gelsonbs@uepg.br; gelsonbs@gmail.com
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Abstract

The mechanical behavior of superconductor lamellar-like BaFe2As2 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).

Keywords

crystal growthlayerednano-indentation

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Journal of Materials Research , Volume 31 , Issue 10 , 28 May 2016 , pp. 1413 - 1422
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Copyright © Materials Research Society 2016 

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References

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