Orientation-dependent hardness and nanoindentation-induced deformation mechanisms of WC crystals

Csanádi, Tamás; Bľanda, Marek; Chinh, Nguyen Q.; Hvizdoš, Pavol; Dusza, Ján

doi:10.1016/j.actamat.2014.09.048

Cited by 123 publications

(60 citation statements)

References 21 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Figure 2 shows the nanohardness H of AZ31 and pure Mg as a function of the declination angle Φ (i.e., the angle between the c-axis of the hcp crystal lattice and the normal to the sample surface, which is parallel to the indentation direction). The dependence of the nanohardness on the angle corresponding to the rotation of the crystal lattice about the c-axis was not investigated; this is consistent with the study by Csanadi et al [21], who demonstrated its negligible magnitude, however, in the case of tungsten carbide.…”

Section: Nanohardnesssupporting

confidence: 75%

“…The nanohardness dependence for pure Mg agrees well with [5], where the experimental values that were measured by displacement-controlled nanoindentation remain constant or marginally increase at Φ < 30°, decrease by approximately 30 % within 30° < Φ < 55°, and are rather constant again for Φ > 55°. It is worth noting that the decrease in nanohardness with increasing Φ was also reported for tungsten carbide [21] and titanium [22][23][24], despite the different values of the c/a axial ratio, which partly determines the preferred deformation mechanisms. Due to the lack of grains with a suitable size and Φ < 27° for pure Mg and Φ < 10° for AZ31, it was not technically feasible to measure the nanohardness evolution for smaller Φ.…”

Section: Nanohardnessmentioning

confidence: 70%

“…Due to the lack of grains with a suitable size and Φ < 27° for pure Mg and Φ < 10° for AZ31, it was not technically feasible to measure the nanohardness evolution for smaller Φ. Nevertheless, based on the existing studies, the nanohardness is expected either to continue rising with decreasing Φ [21][22][23][24] or to remain nearly constant [5].…”

Section: Nanohardnessmentioning

confidence: 95%

See 2 more Smart Citations

Nanomechanical analysis of AZ31 magnesium alloy and pure magnesium correlated with crystallographic orientation

Bočan

Maňák

Jäger

2015

Materials Science and Engineering: A

View full text Add to dashboard Cite

Section: Nanohardnesssupporting

confidence: 75%

Section: Nanohardnessmentioning

confidence: 70%

Section: Nanohardnessmentioning

confidence: 95%

See 1 more Smart Citation

Nanomechanical analysis of AZ31 magnesium alloy and pure magnesium correlated with crystallographic orientation

Bočan

Maňák

Jäger

2015

Materials Science and Engineering: A

View full text Add to dashboard Cite

“…The hardness of the textured nanocrystalline WC coating (Fig. 5a) was around 37 GPa which is just below the hardness of basal planes of WC microcrystals (43-40 GPa) [33]. Lower values in the coatings may be attributed to the deviations of the textured nanocrystals from the ideal orientation and to the presence of boundaries among them.…”

Section: Mechanical Properties Vs Acetylene and Hydrogen Additionsmentioning

confidence: 85%

Tribological behavior of hydrogenated W-C/a-C:H coatings deposited by three different sputtering techniques

et al. 2019

View full text Add to dashboard Cite

The evolution of structure, mechanical properties and friction behavior of DC magnetron sputtered (DCMS), high power impulse magnetron sputtered (HiPIMS) and high target utilization sputtered (HiTUS) W-C:H coatings was investigated as a function of the addition of acetylene and hydrogen into Ar atmosphere. The gradual addition of reactive gases caused a transition from PVD toward hybrid PVD-PECVD and even PECVD dominant processes. The coating structure evolved from nanocrystalline toward nanocomposite and amorphous structure with the increase of acetylene addition. Deposition rates in all techniques increased linearly with the increase of acetylene flow until certain saturation limit due to the limited energy available for acetylene fragmentation during hybrid PVD-PECVD deposition. Hardness and coefficient of friction in DCMS and HiTUS W-C:H coatings deposited in this regime followed standard congruent tendencies whereas PECVD dominated deposition process produced coatings with different dependencies. In contrary, HiPIMS W-C:H coatings showed low sensitivity to the influence of acetylene and hydrogen additions. Lower coefficients of friction (<0.1) and moderate hardness (around 20 GPa) of HiPIMS W-C:H coatings over a wide range of acetylene additions seem to be a principal advantage of HiPIMS compared to DCMS and HiTUS techniques in this class of coatings. Keywords: W-C:H coatings, DC magnetron sputtering (DCMS), high power impulse magnetron sputtering (HiPIMS), high target utilization sputtering (HiTUS), hardness, coefficient of friction.

show abstract

“…The nanoindentation method has a very small measurement area. Therefore, it is expected to be able to measure the effect of the crystal orientation or microdefects of specimens on the mechanical properties of a material [3][4][5][6][7]. In this report, in order to investigate the effect of the crystal orientation, the hardness and the reduced modulus of the single crystal of sapphire were measured by changing the direction angle of Berkovich indenter.…”

Section: Introductionmentioning

confidence: 99%

Orientation Dependence of Hardness and Reduced Modulus of Single Crystal Sapphire Surface Measured by Nanoindentation

Okawa¹,

Clark²,

Tashiro³

et al. 2019

IJMSA

View full text Add to dashboard Cite

Nowadays, industrial products are downsized, and the structure of materials is controlled with the nanometer precision, and it becomes very important to measure the mechanical properties of local area of bulk material. Especially the hardness and the elastic modulus are important mechanical properties. The orientation dependence of hardness and reduced modulus of single crystal sapphire surface was investigated by nanoindentation. The conventional technique to measure the hardness of materials using an optical micrometer cannot evaluate mechanical properties of a local region of several µm or less. However, nanoindentation can measure mechanical properties of very small surface area of materials, and is expected to detect the micro structure dependence of mechanical properties. Nanoindentation uses very small indenter made of diamond, and measures the indentation depth. The measured depth is converted to the indented area size using the area function. The area function of the indenter can be obtained using a standard material (fused quartz) in advance. Therefore nanoindentation can measure the indented area size without using an optical micrometer. In this report, it was shown that the nanoindentation could detect the structure dependence of mechanical properties of materials. The specimen was a single crystal sapphire with c -axis surface, and the indenter was Berkovich type diamond tip. It was confirmed that the nanoindentation hardness was the lowest, and the reduced modulus was the largest, when the ridge line of indenter was oriented to the m -axis of single crystal. The nanoindentation could detect the structure dependence of a local area of mechanical properties materials.

show abstract

Orientation-dependent hardness and nanoindentation-induced deformation mechanisms of WC crystals

Cited by 123 publications

References 21 publications

Nanomechanical analysis of AZ31 magnesium alloy and pure magnesium correlated with crystallographic orientation

Nanomechanical analysis of AZ31 magnesium alloy and pure magnesium correlated with crystallographic orientation

Tribological behavior of hydrogenated W-C/a-C:H coatings deposited by three different sputtering techniques

Orientation Dependence of Hardness and Reduced Modulus of Single Crystal Sapphire Surface Measured by Nanoindentation

Contact Info

Product

Resources

About