Inter Laboratory Comparison and Analysis on Mechanical Properties by Nanoindentation
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Mater. Res. Soc. Symp. Proc. Vol. 1243 © 2010 Materials Research Society
Inter Laboratory Comparison and Analysis on Mechanical Properties by Nanoindentation J. M. Alvarado-Orozco1, C. Cárdenas-Jaramillo1, D. Torres-Torres1, R. Herrera-Basurto2, A. Hurtado-Macias3, J. Muñoz-Saldaña1,3* and G. Trápaga-Martinez1 1 Centro de Investigación y de Estudios Avanzados del IPN, Unidad Querétaro, Libramiento Norponiente 2000, Real de Juriquilla, 76230, Querétaro, México. 2 CENAM-Dirección de Metrología de Materiales, 76241, Querétaro, México. 3 Centro de Investigación en Materiales Avanzados, S.C., Laboratorio Nacional de Nanotecnología, Miguel de Cervantes 120, Complejo Industrial Chihuahua, 31109, Chihuahua, México. * On sabbatical leave.
ABSTRACT This contribution presents the results obtained by a Mexican laboratory in the AsiaPacific Economy Cooperation Interlaboratory Comparison (IC) on mechanical properties by nanoindentation from 2008 using fused silica and polycarbonate as samples. Reduced modulus and indentation hardness are the parameters asked to be measured and compared. The aim for this paper is to show and to discuss the so called “indentation size effect” (ISE) on the indentation hardness of fused silica. Using the spherical formulation of the ISE model for crystalline materials, the macroscopic hardness and material length scale of fused silica are determined as (7.34 ± 0.085) GPa and (166.36 ± 14) nm, respectively. INTRODUCTION Nanoindentation is a well established method to characterize mechanical properties of materials. The distinguishing feature of this technique is the indirect measurement of the contact area using a correlation with the penetration depth. A typical single load nanoindentation test produces a load-penetration curve from which property values such as indentation hardness (HIT) and reduced elastic modulus (Er) can be calculated using a variety of approaches such as the Oliver and Pharr method [1]. However, irrespective of the type of analysis, issues associated with the nanometric scale (e.g. calibration, tip wear) must be accounted for. Several factors may modify nanoindentation results, being the indentation size effect, which is closely associated to the tip radius one of the most important. Due to the importance of characterizing materials in nanometric-scale, reliable measurements are considered a prerequisite for nanotechnology development. One of the most successful ways to assess and evaluate the quality of measurements is the participation in interlaboratory comparisons (IC). The Asia-Pacific Economy Cooperation (APEC) organized an IC in 2008 on nanoindentation. The aim of the comparison is to establish the current quality of the results obtained by different laboratories and it is conducted by the Industrial Science and Technology Working Group (ISTWG) through the NanoTechnology Research Center of Industrial Technology Research Institute (NTRC-ITRI) [2]. The IC of the APEC involved 13 laboratories from 8 different countries. The Mexican laboratory (Mex-Lab) is represented by C
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