Size effect measurement and characterization in nanoindentation test

Nanoindentation test at scale of hundreds of nanometers has shown that measured hardness increases strongly with decreasing indent depth, which is frequently referred to as the size effect. Usually, the size effect is displayed in the hardness-depth curves. In this study, the size effect is characterized in both the load–displacement curves and the hardness–depth curves. The experimental measurements were performed for single-crystal copper specimen and for surface-nanocrystallized Al-alloy specimen. Moreover, the size effect was characterized using the dislocation density theory. To investigate effects of some environmental factors, such as the effect of surface roughness and the effect of indenter tip curvature, the specimen surface profile and the indentation imprint profile for single-crystal copper specimen were scanned and measured using the atomic force microscopy technique. Furthermore, the size effect was characterized and analyzed when the effect of the specimen surface roughness was considered.

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Size effect in the low-field Hall coefficient of single-crystal copper films

Journal of Low Temperature Physics ◽

10.1007/bf00681636 ◽

1985 ◽

Vol 61 (3-4) ◽

pp. 281-289 ◽

Cited By ~ 2

Author(s):

I. Sakamoto ◽

M. Fukuhara ◽

Y. Koide ◽

K. Yonemitsu

Keyword(s):

Size Effect ◽

Single Crystal ◽

Hall Coefficient ◽

Copper Films ◽

Single Crystal Copper ◽

Low Field

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29pm2-F-1 Size effect on initial yielding of single crystal copper in micro-scale torsion test

The Proceedings of the Symposium on Micro-Nano Science and Technology ◽

10.1299/jsmemnm.2015.7._29pm2-f-1 ◽

2015 ◽

Vol 2015.7 (0) ◽

pp. _29pm2-F-1-_29pm2-F-1

Author(s):

Takayuki Yokoyama ◽

Nobuyuki Shishido ◽

Kozo Koiwa ◽

Shoji Kamiya ◽

Hisashi Sato

Keyword(s):

Size Effect ◽

Single Crystal ◽

Torsion Test ◽

Single Crystal Copper ◽

Micro Scale

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Prediction model of the surface roughness of micro-milling single crystal copper

Journal of Mechanical Science and Technology ◽

10.1007/s12206-019-1030-6 ◽

2019 ◽

Vol 33 (11) ◽

pp. 5369-5374

Author(s):

Xiaohong Lu ◽

Liang Xue ◽

Feixiang Ruan ◽

Kun Yang ◽

Steven Y. Liang

Keyword(s):

Surface Roughness ◽

Prediction Model ◽

Single Crystal ◽

Micro Milling ◽

Single Crystal Copper

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Size Effect in Single Crystal Copper Examined with Spherical Indenters

Metallurgical and Materials Transactions A ◽

10.1007/s11661-019-05160-w ◽

2019 ◽

Vol 50 (5) ◽

pp. 2139-2154 ◽

Cited By ~ 2

Author(s):

Stanisław Kucharski ◽

Stefania Woźniacka

Keyword(s):

Size Effect ◽

Single Crystal ◽

Single Crystal Copper

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An investigation of nanoindentation tests on the single crystal copper thin film via an atomic force microscope and molecular dynamics simulation

Proceedings of the Institution of Mechanical Engineers Part C Journal of Mechanical Engineering Science ◽

10.1243/0954406jmes448 ◽

2007 ◽

Vol 221 (2) ◽

pp. 259-266 ◽

Cited By ~ 11

Author(s):

D Huo ◽

Y Liang ◽

K Cheng

Keyword(s):

Thin Films ◽

Mechanical Properties ◽

Molecular Dynamics ◽

Plastic Deformation ◽

Size Effect ◽

Single Crystal ◽

Atomic Force Microscope ◽

Md Simulations ◽

Single Crystal Copper ◽

Atomic Force

Nanoindentation tests performed in an atomic force microscope have been utilized to directly measure the mechanical properties of single crystal metal thin films fabricated by the vacuum vapour deposition technique. Nanoindentation tests were conducted at various indentation depths to study the effect of indentation depths on the mechanical properties of thin films. The results were interpreted by using the Oliver-Pharr method with which direct observation and measurement of the contact area are not required. The elastic modulus of the single crystal copper film at various indentation depths was determined as 67.0 > 6.9 GPa on average, which is in reasonable agreement with the results reported by others. The indentation hardness constantly increases with decreasing indentation depth, indicating a strong size effect. In addition to the experimental work, a three-dimensional nanoindentation model of molecular dynamics (MD) simulations with embedded atom method (EAM) potential is proposed to elucidate the mechanics and mechanisms of nanoindentation of thin films from the atomistic point of view. MD simulations results show that due to the size effect no distinct dislocations were observed in the plastic deformation processes of the single crystal copper thin films, which is significantly different from the plastic deformation mechanism in bulk materials.

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Nanoindentation Size Effect of KDP Crystal by Instrumented Indentation Testing

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.364-366.188 ◽

2007 ◽

Vol 364-366 ◽

pp. 188-192 ◽

Cited By ~ 1

Author(s):

H.X. Wang ◽

Jing He Wang ◽

Shen Dong

Keyword(s):

Elastic Modulus ◽

Size Effect ◽

Single Crystal ◽

Single Point ◽

Indentation Load ◽

Crystal Plane ◽

Nanoindentation Test ◽

Manufacturing Operations ◽

Indentation Tests ◽

Scratch Tests

Indentation tests and single-point scratch tests are probably the simplest methods of measuring the elastic, plastic and fracture behavior of brittle materials. In this paper, the nearsurface mechanical properties of KDP single crystal have been investigated including the elasticity like Young’s modulus E, and the plasticity like the hardness H. These material properties can be used to predict the material responses in optical manufacturing operations. Hardness and elastic modulus on different crystal plane of KDP single crystal have been examined under different loads by nanoindentation test, and the influence of the indentation load on hardness and elastic modulus have been also analyzed systematically. The results show the nanoindentation size effect, that is, the hardness and elastic modulus increase as the indentation load decreases. The hardness and elastic modulus have strong anisotropy in the different crystallographic orientation of the same crystal plane.

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Ultra-Precision Machining Technology Based on Dynamic Minimum Thickness of Cut for Machined Single Crystal Materials

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.138-139.1246 ◽

2011 ◽

Vol 138-139 ◽

pp. 1246-1250

Author(s):

Ji Cai Kuai

Keyword(s):

Surface Roughness ◽

Friction Coefficient ◽

Single Crystal ◽

Surface Quality ◽

Cutting Parameters ◽

Precision Machining ◽

Minimum Thickness ◽

Single Crystal Copper ◽

Ultra Precision ◽

Relationship Of

The dynamic minimum thickness of cut for the ultra-precision machining surface quality is important influence. Between tool and the workpiece for the friction coefficient were analysised, the relationship of the friction coefficient and the MTC were discussed, and the MTC and its effects on surface roughness were a theoretical analysised and experimental verification with processed single crystal copper and single crystal aluminum by AFM’s diamond tip. The results show: the MTC of single-crystal copper (single crystal aluminum) is 5.2nm (8.2nm) in stable cutting conditions. Further processing single crystal copper (ingle crystal aluminum) with cutting thickness of 5.2nm (8.2nm), and the surface roughness Ra160nm (Ra110nm) is obtained. So the MTC is evolving with the friction coefficient and the force ratio, theoretical MTC tends to be minimal value then before the adhering effect to reach remarkable. Appropriate adjustments cutting parameters, the cutting process can always micro-cutting phase to reach the steady-thin chip, and no plowing phenomenon. So the surface residues highly were reduced and higher surface quality was achieved.

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Change of Crystal Orientation of a Single Crystal Copper Specimen by Nano Plastic Forming

TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series A ◽

10.1299/kikaia.73.1052 ◽

2007 ◽

Vol 73 (733) ◽

pp. 1052-1057

Author(s):

Masahiko YOSHINO ◽

Nayuta MINAMI ◽

Hidehiko KIMURA ◽

Takashi MATSUMURA ◽

Noritsugu UMEHARA

Keyword(s):

Single Crystal ◽

Crystal Orientation ◽

Single Crystal Copper ◽

Copper Specimen ◽

Plastic Forming

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Size Effect Characterization for Nanostructured Material in Nanoindentation Test

MRS Proceedings ◽

10.1557/proc-788-l8.2 ◽

2003 ◽

Vol 788 ◽

Author(s):

Yueguang Wei ◽

Ying Du ◽

Siqi Shu ◽

Chen Zhu

Keyword(s):

Cell Model ◽

Nanostructured Material ◽

Nanoindentation Test ◽

Model Parameters ◽

Al Alloy ◽

Theoretical Simulation ◽

Alloy Material ◽

Material Hardness ◽

Indent Depth ◽

Depth Curves

ABSTRACTBased on the microscopic observations and measurements, the mechanics behaviors of the nanostructured material (the surface-nanocrystallized Al-alloy material) at microscale are investigated experimentally and theoretically. In the experimental research, the hardness-indent depth curves or relations are measured by using both the method of randomly selecting loading points on the specimen surface and the continuous stiffness method. In the theoretical simulation, based on both the material microstructure characteristics and the experimental features of the nanoindentation, the microstructure cell model is developed and the strain gradient plasticity theory is adopted. The material hardness-indent depth curves are predicted and simulated. Through comparison of the experimental results with the simulation results, the material parameters and the model parameters are determined.

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