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Analyzing mechanical properties of a nanocrystalline Fe–Ni coating by nanoindentation

Published online by Cambridge University Press:  19 September 2011

Lian-Hao Yi ,
Chun-Ying Lee ,
Liuwen Chang ,
Ting-Ruei Lee  and
Po-We Kao
Lian-Hao Yi
Affiliation:
Department of Materials and Optoelectronic Science, Center for Nanoscience and Nanotechnology, National Sun Yat-Sen University, Kaohsiung, Taiwan, Republic of China
Chun-Ying Lee
Affiliation:
Department of Mechanical Engineering, National Taipei University of Technology, Taipei, Taiwan, Republic of China
Liuwen Chang*
Affiliation:
Department of Materials and Optoelectronic Science, Center for Nanoscience and Nanotechnology, National Sun Yat-Sen University, Kaohsiung, Taiwan, Republic of China
Ting-Ruei Lee
Affiliation:
Department of Materials and Optoelectronic Science, Center for Nanoscience and Nanotechnology, National Sun Yat-Sen University, Kaohsiung, Taiwan, Republic of China
Po-We Kao
Affiliation:
Department of Materials and Optoelectronic Science, Center for Nanoscience and Nanotechnology, National Sun Yat-Sen University, Kaohsiung, Taiwan, Republic of China
*
a)Address all correspondence to this author. e-mail: lwchang@mail.nsysu.edu.tw
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Abstract

Systematic nanoindentation experiments have been carried out to study the mechanical properties of a nanocrystalline Fe–51Ni coating exhibiting anelastic and creep characteristics. An analytical method based on the correspondence principle for linear viscoelasticity was developed. The holding displacement–time data obtained in indentation creep tests at a high loading rate of 20 mN/s were analyzed, and material parameters related to the elastic, anelastic, and creep characteristics were derived using a model containing one Maxwell unit and two Kelvin units. The anelastic deformation thus contains at least two relaxation processes having relaxation times of 0.37 and 6.8 s, respectively, and the creep deformation is described by a viscosity value of 4.2 × 104 GPa·s for the alloy in an as-deposited state. The anelastic and creep characteristics descend associated with increases of the elastic modulus and hardness values after the alloy was annealed at 673 K.

Keywords

MetalNanoindentationNanostructure
Type
Articles
Information
Journal of Materials Research , Volume 26 , Issue 19 , 14 October 2011 , pp. 2533 - 2542
Copyright
Copyright © Materials Research Society 2011

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