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Kim, Young-Cheon
Robust Multifunctional Materials Lab
Research Interests
  • Effect of Material Characteristic Lengths on Mechanical Behavior of Metals

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Use of Spherical Instrumented Indentation to Evaluate the Tensile Properties of 3D Combined Structures

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Title
Use of Spherical Instrumented Indentation to Evaluate the Tensile Properties of 3D Combined Structures
Author
Song, WON-SEOKKim, SEUNG-GYUKim, Young-CheonKwon, DONGIL
Issue Date
2015-03
Publisher
SPRINGER
Citation
JOURNAL OF ELECTRONIC MATERIALS, v.44, no.3, pp.831 - 835
Abstract
In this paper we propose a novel method, spherical indentation, for evaluation of the plastic properties of combined structures. Three-dimensional (3D) printed products, for example gradient metal alloys consisting of different kinds of material, contain interfaces that can act as weak points and threaten the mechanical reliability of products. Combined structures containing an interface between Cu alloy and Ag were prepared for testing. Samples were heat-treated at 100°C and 200°C for 3 h to optimize processing conditions. The indentation tensile properties of the samples were estimated by analyzing multiple loading-unloading curves obtained by use of the representative stress and strain method. A continuous increase in both yield strength and tensile strength was observed for the Cu alloy and the Cu/Ag interface after heat treatment at up to 200°C, because of precipitation hardening. These experimental results show that mechanical characterization of combined structures by spherical indentation is highly useful on the nano and micro scales.
URI
https://scholarworks.unist.ac.kr/handle/201301/11201
URL
http://link.springer.com/article/10.1007%2Fs11664-014-3593-4
DOI
10.1007/s11664-014-3593-4
ISSN
0361-5235
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