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Grain Size Dependence of Mechanical Properties in Nanocrystalline Selenium

Published online by Cambridge University Press:  31 January 2011

K. Lu ,
H. Y. Zhang ,
Y. Zhong  and
H. J. Fecht
K. Lu
Affiliation:
State Key Laboratory for RSA, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110015, People's Republic of China
H. Y. Zhang
Affiliation:
State Key Laboratory for RSA, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110015, People's Republic of China
Y. Zhong
Affiliation:
Technical University of Berlin, Institute for Metals Research, Hardenbergstr. 36, D-10623 Berlin, Germany
H. J. Fecht
Affiliation:
Technical University of Berlin, Institute for Metals Research, Hardenbergstr. 36, D-10623 Berlin, Germany
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Abstract

Porosity-free nanocrystalline element selenium (nc-Se) samples with the mean grain sizes ranging from 8 to 70 nm were synthesized by complete crystallization of the melt-quenched amorphous Se solid. Mechanical properties including microhardness (Hv) and elastic modulus (E) of the nc-Se samples were measured by means of nanoindentation tests and microhardness tests, respectively. With a reduction of grain size, the nc-Se samples were found to be substantially hardened. But the grain size dependence of Hv does not follow a simple Hall–Petch relation over the whole grain size range, exhibiting three distinct stages corresponding to three different Hall–Petch slopes. The maximum Hall–Petch slope was found to be in the grain size range of 15–20 nm, corresponding to large values of the elastic modulus. This behavior can be explained in terms of the lattice distortion in the nc-Se samples that was experimentally determined by using quantitative x-ray diffraction measurements. A conclusion is drawn that the lattice structure of the nm-sized crystallites may play an important role in mechanical properties of nanocrystalline materials.

Type
Articles
Information
Journal of Materials Research , Volume 12 , Issue 4 , April 1997 , pp. 923 - 930
Copyright
Copyright © Materials Research Society 1997

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