scholarly journals Indentation Load-Size Effect in Al2O3 — SIC Nanocomposites

2010 ◽  
Vol 61 (5) ◽  
pp. 305-307 ◽  
Author(s):  
Erika CsehovAaA ◽  
Jana AndrejovskAaA ◽  
Apichart Limpichaipanit ◽  
Ján Dusza ◽  
Richard Todd
Keyword(s):  
Size Effect ◽  
Vickers Hardness ◽  
Indentation Load ◽  
Proportional Specimen Resistance ◽  
Load Size ◽  
Hardness Values ◽  
True Hardness

Indentation Load-Size Effect in Al2O3 — SIC Nanocomposites The indentation load-size effect (ISE) in Vickers hardness of Al2O3 and Al2O3 + SiC nanocomposites has been investigated and analysed using Meyer law, proportional specimen resistance (PSR) model and modified proportional specimen resistance (MPSR) model. The strongest ISE was found for alumina. Both the PSR and MPSR models described the ISE well, but the MPSR model resulted in slightly lower true hardness values for all materials investigated. No evidence of the effect of machining stresses on the ISE has been found.

Indentation Testing of an Al2O3/Al2O3 + ZrO2 Layered Composite

2005 ◽  
Vol 290 ◽  
pp. 316-319
Author(s):  
Peter Zimovčák ◽  
Tibor Köves ◽  
Ján Dusza ◽  
Ladislav Pešek ◽  
Francis Chalvet ◽  
...  
Keyword(s):  
Fracture Toughness ◽  
Residual Stresses ◽  
Size Effect ◽  
Vickers Hardness ◽  
Layered Composite ◽  
Indentation Load ◽  
Indentation Fracture ◽  
Depth Sensing ◽  
The Individual ◽  
Load Size

Micro- and macro-hardness of the individual layers of an Al2O3 / Al2O3 + ZrO2 layered composite have been investigated. The indentation load size effect has been studied in a range of indentation load of 25 mN – 100 N using depth sensing indentation technique and conventional Vickers hardness testers. Fracture toughness values of the layers have been measured using indentation fracture method. The effect of residual stresses on the KIC value has been analyzed.

Nanohardness of Individual Phases in WC – Co Cemented Carbides

2013 ◽  
Vol 586 ◽  
pp. 23-26 ◽  
Author(s):  
Annamária Duszová ◽  
Radoslav Halgaš ◽  
Pavol Priputen ◽  
Marek Bľanda ◽  
Pavol Hvizdoš ◽  
...  
Keyword(s):  
Size Effect ◽  
Significant Influence ◽  
Crystallographic Orientation ◽  
Grain Orientation ◽  
Indentation Load ◽  
Cemented Carbides ◽  
Indentation Modulus ◽  
Instrumented Indentation ◽  
Load Size

The nanohardness of WC – Co hardmetals has been investigated using instrumented indentation and Berkovich tip indenter. The nanohardness, HIT, and indentation modulus, EIT, of Co phase and individual WC grains and the influence of their crystalographic orientation have been studied. SEM, AFM and EBSD methods were used for the characterization of the microstructures and indents and for the identification of crystallographic orientation of WC grains, respectively. Strong indentation load-size effect and significant influence of the crystallographic orientation of WC crystals on HIT and EIT have been found. The nanohardness of Co binder was approximately 10 GPa and that of WC grains varied between 25 and 50 GPa, depending on the grain orientation and load. The nanohardness values of the basal and prismatic planes of individual WC grains at load of 10 mN were 40.4 ± 1.6 GPa and 32.8 ± 2.0 GPa, respectively.

Hardness and indentation load-size effect in Al2O3-SiC nanocomposite

2011 ◽  
Vol 49 (2) ◽  
pp. 119-124 ◽  
Author(s):  
E. CSEHOVA ◽  
J. ANDREJOVSKA ◽  
A. LIMPICHAIPANIT ◽  
J. DUSZA ◽  
R. TODD
Keyword(s):  
Size Effect ◽  
Indentation Load ◽  
Load Size

Indentation Testing of MoSi2

2005 ◽  
Vol 290 ◽  
pp. 288-291 ◽  
Author(s):  
M. Henžel ◽  
Peter Zimovčák ◽  
Ján Dusza ◽  
András Juhász ◽  
Janos Lendvai
Keyword(s):  
High Temperature ◽  
Indentation Load ◽  
High Temperature Deformation ◽  
Temperature Deformation ◽  
Slip Systems ◽  
Deformation Characteristics ◽  
Depth Sensing ◽  
Indentation Methods ◽  
Load Size ◽  
Hardness Values

Indentation methods have been used for the study of the hardness and deformation characteristics MoSi2. Micro-nanoindentation tests at loads from 10 mN to 2000 mN were carried out using the depth-sensing method. Measurements of the microhardness using conventional Vickers method was carried out at loads of 500 mN, 1000 mN and 2000 mN. The Universal (Martens), Plastic and conventional Vickers hardness values were calculated at different indentation loads. Evident indentation load - size effect was found in both materials. According to the results, the pre-strain reduces the micro-nano hardness values, probably due to the activation of slip systems during the high-temperature deformation.

scholarly journals Microhardness Anisotropy and the Indentation Load/Size Effect in MgO⋅xAl2O3 Single Crystals

1991 ◽  
Vol 99 (1155) ◽  
pp. 1079-1087 ◽  
Author(s):  
Hong LI ◽  
Hisayuki SUEMATSU ◽  
Takayoshi ISEKI ◽  
Richard C. BRADT
Keyword(s):  
Size Effect ◽  
Single Crystals ◽  
Indentation Load ◽  
Load Size

Vickers hardness indentation size effect in selective laser melted MS1 maraging steel

2019 ◽  
pp. 095440621989230 ◽  
Author(s):  
Sebastian Balos ◽  
Dragan Rajnovic ◽  
Leposava Sidjanin ◽  
Olivera Eric Cekic ◽  
Slobodan Moraca ◽  
...  
Keyword(s):  
Size Effect ◽  
Cross Sections ◽  
Vickers Hardness ◽  
Indentation Size Effect ◽  
Full Range ◽  
Indentation Size ◽  
Load Dependence ◽  
Proportional Specimen Resistance ◽  
Heat Treated ◽  
Correlation Factors

In this paper, selective laser melting fabricated specimens in non-heat-treated and heat-treated conditions were subjected to Vickers microhardness testing, by using a full range of loadings: 10, 25, 50, 100, 200, 300, 500, and 1000 g. Microhardness of longitudinal sections and cross-sections were correlated and the obtained values were plotted against loadings and indentation size effect was studied, in order to find the optimal loading range, that gives the material true microhardness, or load-independent hardness. The load dependence of the measured Vickers hardness values was described quantitatively through the application of the Meyer’s law, proportional specimen resistance, and the modified proportional specimen resistance model. It was found that the microhardness rises as the loading is higher, causing a reversed indentation size effect, clearly indicating the range of true hardnesses of the tested material. Also, proportional specimen resistance and modified proportional specimen resistance models were found to have the highest correlation factors indicating their higher adequacy compared to Meyer’s prediction model.

Analysis of Indentation Size Effect of Vickers Hardness Tests of Steels

2013 ◽  
Vol 652-654 ◽  
pp. 1307-1310 ◽  
Author(s):  
Nyoman Budiarsa ◽  
Andrew Norbury ◽  
Xiao Xiang Su ◽  
Gareth Bradley ◽  
Xue Jun Ren
Keyword(s):  
Experimental Data ◽  
Size Effect ◽  
Power Law ◽  
Vickers Hardness ◽  
Material Properties ◽  
Indentation Size Effect ◽  
Indentation Load ◽  
Indentation Size ◽  
Load Range ◽  
Hardness Tests

In this work, the indentation size effect (ISE) in Vickers hardness tests of steel with selected heat treatments (annealed or tempered) has been investigated and analysed. Systematical hardness tests were performed within a commonly used micro-load range. The experimental data was analysed according to the Meyer power-law and the proportional specimen resistance (PSR) models and the link between ISE and material properties was discussed. The results showed that the experimental data fitted well with the Mayers power-law (P = A.dn) and the PSR (P/d = al + a2d) models. The ISE index (n) showed a good correlation with the hardness-elastic modulus ratio (H/E), which potentially could be used to predict the relative contributions of the elastic and plastic deformation contact area under indentation load and to normalize the hardness values for inverse material properties .

scholarly journals Application of the plasticity characteristic determined by the indentation technique for evaluation of mechanical properties of coatings: I. specific features of the test method procedure

2004 ◽  
Vol 36 (1) ◽  
pp. 27-41 ◽  
Author(s):  
A.V. Byakova ◽  
Yu.V. Milman ◽  
A.A. Vlasov
Keyword(s):  
Mechanical Properties ◽  
Indentation Load ◽  
Test Method ◽  
Simplified Model ◽  
Micro Hardness ◽  
Properties Of Coatings ◽  
Modified Model ◽  
Plasticity Characteristic ◽  
Measurement Results ◽  
Hardness Values

Specific features of the test method procedure capable for determining the plasticity characteristic dH by indentation of inhomogeneous coatings affected by residual stress was clarified. When the value of the plasticity characteristic for coating was found to be as great as dH > 0.5 a simplified model was found to be reasonably adequate, while a modified model assumed compressibility of the deformation core beneath indentation. The advantage of the modified approach compared to the simplified one was grounded experimentally only if the elastic deformation for coating becomes greater than ?e ? 3.5%, resulting in the decrease of plasticity characteristic dH < 0.5. To overcome non accuracy caused by the effect of the scale factor on measurement results a comparison of different coatings was suggested using stabilized values of the plasticity characteristic dH determined under loads higher than critical, P ? Pc, ensuring week dependence of micro hardness values on the indentation load.

Sign in / Sign up

Export Citation Format

Share Document