Nanomechanical Characterization on Zinc and Tin Oxides Nanobelts

2002 ◽  
Vol 740 ◽  
Author(s):  
Minhua Zhao ◽  
Scott Mao ◽  
Zhong Lin Wang ◽  
Fengting Xu ◽  
John A Barnard
Keyword(s):  
Size Effect ◽  
Cross Section ◽  
Indentation Depth ◽  
Indentation Size Effect ◽  
Indentation Size ◽  
Tin Oxides

ABSTRACTNanobelts are a group of materials that have a rectangle-like cross section with typical widths of several hundred nanometers, width-to-thickness ratios of 5 to 10, and lengths of hundreds of micron meters. In this paper, nanoindentations were made on individual ZnO, SnO2 nanobelts and (0001) bulk ZnO by using AFM and Hysitron Triboscope indenters. It was shown that the indentation size effect was still obvious for the indentation depth under 50 nm. It is also demonstrated that nanomaching is possible on nanobelt using AFM tip.

Indentation Size Effect on Hardness of Nanostructured Thin Films

2006 ◽  
Vol 312 ◽  
pp. 363-368 ◽  
Author(s):  
Chun Sheng Lu ◽  
Yiu Wing Mai ◽  
Yao Gen Shen
Keyword(s):  
Thin Films ◽  
Plastic Deformation ◽  
Grain Boundary ◽  
Size Effect ◽  
Indentation Depth ◽  
Indentation Size Effect ◽  
Indentation Size ◽  
Nanostructured Thin Films ◽  
Measured Hardness

Based on nanoindentation techniques, the evaluation of hardness of two nanostructured thin films, AlN and Ti-Al-N, is discussed. In the case of AlN films, the indentation size effect of hardness can be modeled using the concept of geometrically necessary dislocations, whereas in the case of Ti-Al-N films, the measured hardness increases exponentially as the indentation depth decreases. The results show that, as thin films approach superhard, dislocation-based plastic deformation is gradually replaced by grain-boundary mediated deformation.

On the interpretation of the indentation size effect (ISE) through gradient theory for Vickers and Berkovich indenters

2016 ◽  
Vol 25 (5-6) ◽  
pp. 161-164 ◽  
Author(s):  
Asterios K. Kampouris ◽  
Avraam A. Konstantinidis
Keyword(s):  
Size Effect ◽  
Indentation Depth ◽  
Indentation Size Effect ◽  
Gradient Theory ◽  
Indentation Size ◽  
Model Predictions

AbstractThe so-called indentation size effect (ISE) observed mainly in nanoindentation measurements with prismatic tips, is theoretically modeled in this article with the use of gradient theory. It is shown that the ISE, i.e. the dependence of the calculated hardness value on the indentation depth, is rather an artifact of the geometry of the tip used, than a phenomenon related to the material tested. The model predictions are compared with nanoindentation measurements of Al specimens.

Deformation behavior and indentation size effect in amorphous and crystallized Pd40Cu30Ni10P20 alloy

2009 ◽  
Vol 24 (5) ◽  
pp. 1693-1699 ◽  
Author(s):  
N. Li ◽  
L. Liu ◽  
K.C. Chan
Keyword(s):  
Amorphous Alloy ◽  
Size Effect ◽  
Deformation Behavior ◽  
Indentation Depth ◽  
Indentation Size Effect ◽  
Indentation Hardness ◽  
Indentation Size ◽  
Surface Residual Stress ◽  
Deformation Behaviors ◽  
The Difference

The deformation behavior and indentation size effect (ISE) in amorphous and crystallized Pd40Cu30Ni10P20 alloy were comparatively studied through instrumented nanoindentation. It was found that the two alloys showed different deformation behaviors, the amorphous alloy exhibited conspicuous pop-in events in the load-depth (P-h) curve, while the crystallized alloy showed a relatively smooth P-h curve. In addition, the indentation hardness was observed to decrease with increasing penetration depth in the two alloys, exhibiting a significant ISE. However, the crystallized alloy displayed a sharper reduction of hardness with indentation depth as compared to the amorphous alloy, indicating a more significant indentation size effect in the crystalline alloy. The structure difference and friction factor associated with the surface residual stress are taken into account to interpret the difference in the deformation behavior and indentation size effect of the two alloys.

Indentation Size Effect on the Hardness of a Sn-Ag-Cu Solder

2009 ◽  
Author(s):  
Y. D. Han ◽  
H. Y. Jing ◽  
S. M. L. Nai ◽  
C. M. Tan ◽  
L. Y. Xu ◽  
...  
Keyword(s):  
Size Effect ◽  
Indentation Depth ◽  
Indentation Size Effect ◽  
Scale Dependence ◽  
Lead Free ◽  
Lead Free Solder ◽  
Indentation Size ◽  
Ramp Rate ◽  
Free Solder

In the present study, nanoindentation studies of the 95.8Sn-3.5Ag-0.7Cu lead-free solder were conducted over a range of maximum loads from 20mN to 100mN, under a constant ramp rate of 0.05s−1. The indentation scale dependence of hardness was investigated. The results revealed that the hardness is dependent on the indentation depth. As the maximum holding load increased, which corresponded to an increasing indentation depth, a decreasing trend in the hardness was observed.

scholarly journals Investigation of the mechanism of the indentation size effect for titanium

2019 ◽  
Vol 6 (2) ◽  
pp. 18-00545-18-00545
Author(s):  
Shota HASUNUMA ◽  
Hirohisa MIYAZAKI ◽  
Takeshi OGAWA
Keyword(s):  
Size Effect ◽  
Indentation Size Effect ◽  
Indentation Size

Cracking and the Indentation Size Effect for Knoop Hardness of Glasses

2003 ◽  
Vol 86 (3) ◽  
pp. 441-448 ◽  
Author(s):  
George D. Quinn ◽  
Patrice Green ◽  
Kang Xu
Keyword(s):  
Size Effect ◽  
Indentation Size Effect ◽  
Knoop Hardness ◽  
Indentation Size

Indentation size effect of cortical bones submitted to different soft tissue removals

2013 ◽  
Vol 20 ◽  
pp. 338-346 ◽  
Author(s):  
A. Bandini ◽  
D. Chicot ◽  
P. Berry ◽  
X. Decoopman ◽  
A. Pertuz ◽  
...  
Keyword(s):  
Soft Tissue ◽  
Size Effect ◽  
Indentation Size Effect ◽  
Indentation Size

Further analysis of the size effect in indentation hardness tests of some metals

1995 ◽  
Vol 10 (11) ◽  
pp. 2908-2915 ◽  
Author(s):  
M. Atkinson
Keyword(s):  
Size Effect ◽  
Strain Hardening ◽  
Indentation Size Effect ◽  
Plastic Hinge ◽  
Small Scale ◽  
Indentation Hardness ◽  
Vickers Indentation ◽  
Indentation Size ◽  
Hardness Tests ◽  
Indentation Tests

The variation of apparent hardness observed in previously reported Vickers indentation tests of metals is reexamined. Common deseriptions of the effect are shown to be inaccurate: the variation of apparent hardness is monotonic but not simple. The effect is consistent with varying size of a previously postulated “plastic hinge” at the perimeter of the indent. This complexity confers uncertainty on the estimation of characteristic macrohardness from small scale tests. Association of the indentation size effect with friction and with strain hardening is confirmed.

Evaluating plastic flow properties by characterizing indentation size effect using a sharp indenter

2008 ◽  
Vol 56 (14) ◽  
pp. 3338-3343 ◽  
Author(s):  
Ju-Young Kim ◽  
Seung-Kyun Kang ◽  
Julia R. Greer ◽  
Dongil Kwon
Keyword(s):  
Size Effect ◽  
Plastic Flow ◽  
Indentation Size Effect ◽  
Flow Properties ◽  
Indentation Size
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