scholarly journals The effect of tip radius on nano-indentation hardness tests

1995 ◽  
Vol 32 (12) ◽  
pp. 1759-1770 ◽  
Author(s):  
Chung-Jen Lu ◽  
D.B. Bogy
Keyword(s):  
Indentation Hardness ◽  
Nano Indentation ◽  
Hardness Tests ◽  
Tip Radius

Effects of Neutron, Ion and Proton Irradiation on Nano-Indentation Hardness of RPV Steels

2020 ◽  
Vol 999 ◽  
pp. 39-46
Author(s):  
Cheng Liang Li ◽  
Guo Gang Shu ◽  
Jing Li Yan ◽  
Wei Liu ◽  
Yuan Gang Duan
Keyword(s):  
Proton Irradiation ◽  
Indentation Hardness ◽  
Irradiation Embrittlement ◽  
Irradiation Hardening ◽  
Nano Indentation ◽  
Rpv Steel ◽  
Hardness Tests ◽  
Increase Rate ◽  
Before And After ◽  
Reactor Pressure

The irradiation embrittlement damage of reactor pressure vessel (RPV) steel is one of its primary failure mechanisms. In this work, neutron, ion and proton irradiation experiments were carried on the same commercial RPV steels with the same irradiation fluence under the same temperature of 292°C. Then the nano-indentation hardness tests were performed on the RPV steel before and after irradiation. The results show that the irradiation hardening effects are observed by means of nano-indentation technique under the above three irradiations, and the hardening features are basically the same. While the max variation and increase rate are obviously different between those irradiations. It is found that the main reason of the above differences are caused by different energies of irradiation energetic particles, resulting in different types and quantities of defects. The conclusions in this paper are helpful to select and compare different irradiation experiments to the research of RPV steels irradiation embrittlement damage.

Research on the Relationship between Indenter Tip Radius and Hardness with a Self-Designed Nanohardness Test Device

2008 ◽  
Vol 392-394 ◽  
pp. 267-270
Author(s):  
Qiang Liu ◽  
Ying Xue Yao ◽  
L. Zhou
Keyword(s):  
Single Crystal ◽  
Indentation Depth ◽  
Single Crystal Silicon ◽  
Indentation Hardness ◽  
Displacement Curve ◽  
Test Device ◽  
Crystal Silicon ◽  
Load Displacement ◽  
Depth Sensitivity ◽  
Tip Radius

Nanoindentation device has the ability to make the load-displacement measurement with sub-nanometer indentation depth sensitivity, and the nanohardness of the material can be achieved by the load-displacement curve. Aiming at the influence law of indenter tip radius to indentation hardness, testing on the hardness of single-crystal silicon were carried out with the new self-designed nanohardness test device based on nanoindentation technique. Two kinds of Berkovich indenter with radius 40nm and 60nm separately were used in this experiment. According to the load-depth curve, the hardness of single-crystal silicon was achieved by Oliver-Pharr method. Experimental results are presented which show that indenter tip radius do influence the hardness, the hardness value increases and the indentation size effect (ISE) becomes obvious with the increasing of tip radius under same indentation depth.

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.

Measuring Microscopic Properties of a Single-Crystalline Diamond by Nano-Indentation Technology

2015 ◽  
Vol 1120-1121 ◽  
pp. 378-382 ◽  
Author(s):  
Qi Long Wei ◽  
Xiao Bin Yue ◽  
Xiao Yuan Li ◽  
Bo Liu ◽  
Xiao Feng Zhang ◽  
...  
Keyword(s):  
Great Influence ◽  
Fused Silica ◽  
Diamond Surface ◽  
Measurement Properties ◽  
Indentation Hardness ◽  
Silica Sample ◽  
Single Crystalline ◽  
Nano Indentation ◽  
Indentation Force ◽  
Before And After

Nano-indentation technology was brought to study microscopic mechanical properties of a single-crystalline diamond (SCD). Nano-indentation measurement was conducted on the {100} plane of SCD, and influences of various factors on measured results were analyzed, from which methods were confirmed to improve veracity of measurement. Properties of the indenter were checked with a fused silica sample both before and after indentation on diamond, which provided guarantee to veracity of results on diamond. It was found that tilt of diamond surface had so great influence that it could damage the indenter, and make the indentation curves anomalous. While damage of indenter could be avoided and valid measurement results could be obtained when tilt of diamondsurface was decreased below 0.10º and the maximal indentation force was less than 10 mN. Deformation of the diamond was almost full-elastic during indentation process. Indentation hardness of {100} plane of the SCD was about 70 GPa with standard deviation less than 3 GPa. And there had good reproducibility between two groups of measurements.

Strengthening of Aluminum by Oxygen Implantation: Experimental Results and Mechanical Modeling

1989 ◽  
Vol 157 ◽  
Author(s):  
Roy J. Bourcier ◽  
David M. Follstaedt ◽  
Samuel M. Myers ◽  
Douglas H. Polonis
Keyword(s):  
Mechanical Response ◽  
Rutherford Backscattering Spectrometry ◽  
Element Model ◽  
Homogeneous Distribution ◽  
Indentation Hardness ◽  
Transmission Electron ◽  
Hardness Tests ◽  
Low Load ◽  
High Purity Aluminum ◽  
Surface Modified

ABSTRACTThe microstructuTe and mechanical properties of high purity aluminum implanted with 20 at.% oxygen to a depth of roughly 500 nm and subjected to various thermal histories have been examined. Transmission electron microscopy and Rutherford-backscattering spectrometry were used to characterize the depth and nature of the implanted zone. As implanted, the material appears to contain a homogeneous distribution of disordered precipitates with sizes of 1.5-3.5 nm. Annealing at 450 or 550ΰC for 1 hour, induces ordering of the precipitates but only causes slight coarsening. Ultra-low load indentation hardness testing was used to probe the mechanical response of the surface-modified material. The data from the hardness tests were interpreted through the use of a finite-element model; the results indicate the flow stresses of an implanted and annealed layer are as high as 1600 MPa. The as-implanted material is much harder, approaching 3300 MPa. The degree of strengthening expected for the as-implanted and post-annealed material on the basis of the observed microstructure was estimated using several micromechanical models, and the results conform to the findings from indentation testing.

scholarly journals Examination of Tensile Deformation and Void Nucleation Behaviors of Duplex Stainless Steel Using Nano-Indentation Hardness Test

2014 ◽  
Vol 100 (10) ◽  
pp. 1261-1266 ◽  
Author(s):  
Masatoshi Aramaki ◽  
Satoshi Uchida ◽  
Kyono Yasuda ◽  
Makoto Oikawa ◽  
Osamu Furukimi
Keyword(s):  
Stainless Steel ◽  
Duplex Stainless Steel ◽  
Tensile Deformation ◽  
Void Nucleation ◽  
Hardness Test ◽  
Indentation Hardness ◽  
Nano Indentation

Study on the Microstructure and Properties of Suspensory Wire in DVD CD-ROM Head

2010 ◽  
Vol 142 ◽  
pp. 95-98
Author(s):  
Lan Ying Wu ◽  
Yan Lin Wang ◽  
Jing Deng
Keyword(s):  
Elasticity Modulus ◽  
Treatment Time ◽  
Aging Treatment ◽  
Indentation Hardness ◽  
Cd Rom ◽  
X Ray ◽  
Nano Indentation ◽  
Hardness Tester ◽  
Average Hardness ◽  
Material Hardness

The suspensory wire is widely applied in the fields of DVD CD-ROM head and various sensors. In this paper, the suspensory wires are analyzed with the SEM, X-ray energy spectrum and Hydrogen power spectrum et al. The research results show that the alloy composition of the suspensory wire is the composite materials, which is composed of silver, beryllium and copper bimetal; The Nano-indentation hardness tester is also did using the hanging Nano-indentation experiments on the suspensory wire, it’s to obtain more accurate mechanical properties parameters of material hardness and so on, then we get the average hardness of suspensory wire is 3.891 GPa; The average elasticity modulus decreases as the aging treatment time increases, and the average tensile strength increases as the aging treatment time increases.

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