Effects of Cr2O3 addition on the mechanical properties, microstructure and wear performance of zirconia-toughened-alumina (ZTA) cutting inserts

Azhar, Ahmad Zahirani Ahmad; Choong, Lee Chun; Mohamed, Hasmaliza; Ratnam, Mani Maran; Ahmad, Zainal Arifin

doi:10.1016/j.jallcom.2011.09.092

Cited by 73 publications

(47 citation statements)

References 19 publications

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“…Regardless of their advantages, ceramic materials exhibit very low toughness which eventually limits their overall applications [2][3][4][5][6].…”

Section: Introductionmentioning

confidence: 99%

“…The challenge of increasing the toughness of ceramic based materials has been a key motivation in the field of ceramic research [6][7][8]. In this pursuit of improving toughness, Al 2 O 3 based materials are often used as the benchmark due to its abundance, relative cheapness and excellent mechanical properties [9][10][11].…”

Section: Introductionmentioning

confidence: 99%

“…The authors' previous works investigated MgO, Cr 2 O 3 , CeO 2 and CaCO 3 for improving the mechanical properties of ZTA without diminishing properties of ZTA [3][4][5][6]16,17]. The current research has been done to understand the role of TiO 2 in ZTA ceramic composites.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Effects of TiO2 addition on the phase, mechanical properties, and microstructure of zirconia-toughened alumina ceramic composite

Manshor

Aris

Azhar

et al. 2015

Ceramics International

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“…Regardless of their advantages, ceramic materials exhibit very low toughness which eventually limits their overall applications [2][3][4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Effects of TiO2 addition on the phase, mechanical properties, and microstructure of zirconia-toughened alumina ceramic composite

Manshor

Aris

Azhar

et al. 2015

Ceramics International

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“…Previous works [9][10][11][12][13][14] have investigated the effects of various additives on the microstructural, mechanical properties, and tool wear of ZTA composites. Furthermore, their analysis has also proven that ZTA composite is an excellent candidate for cutting insert applications.…”

Section: Introductionmentioning

confidence: 99%

The relationship between microstructure and fracture toughness of zirconia toughened alumina (ZTA) added with MgO and CeO2

Rejab

Azhar

Ratnam

et al. 2013

International Journal of Refractory Metals and Hard Materials

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The aim of this research is to investigate the mode of crack propagation in zirconia toughened alumina (ZTA) added with MgO and CeO 2 , respectively. The mode of crack refers to the toughening mechanism of the materials. Different ZTA compositions containing MgO and CeO 2 as sintering additives were prepared using pressureless sintering at 1600°C. Each sample was subjected to Vickers indentation with 294 N load and the cracks that propagated were observed with SEM. The ZTA with an addition of 0.7 wt.% MgO showed a crack deflection with a fracture toughness value of 6.19 ± 0.26 MPa · √m. On the other hand, the ZTA with CeO 2 addition of 0.5 to 7 wt.% showed both crack bridging and deflection, and produced 5.78 ± 0.16 MPa · √m to 6.59 ± 0.23 MPa · √m fracture toughness values, respectively. The fracture toughness of the ZTA-MgO-CeO 2 compositions is higher due to crack bridging and crack deflection. The toughening mechanisms of crack deflection and bridging hinder crack propagation since more energy is required to make the crack propagate. However, the formation of CeAl 11 O 18 phase was observed; this consequently decreases the hardness and fracture toughness of the ZTAMgO-CeO 2 compositions.

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“…It has good oxidation resistance, chemical stability, good electric insulation, relatively high hardness, high wear resistance, and low friction in many contact situations. Therefore it is used as wearresistant inserts [1], biomedical implants [2], wear resist coatings [3], thin films [4], and armour plates [5]. All such high end engineering applications of alumina and/or its composites are basically controlled by contact-induced deformation mechanisms and damage initiation, as well as growth mechanisms at macro-, micro-and/or nanostructural length scale of the microstructure.…”

Section: Introductionmentioning

confidence: 99%

Contact Deformation of Alumina

Bhattacharya

Mukhopadhyay

2012

ISRN Ceramics

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The study of contact-induced deformations during hardness evaluation and the subsequent damage mechanisms of alumina under low loads deserves significant importance for its applications as wear-resistant inserts, biomedical implants, thin films, and armour plates, because the contact-induced brittle failure is an issue of major scientific concern that prevents their widespread commercial applications. However, the studies on hardness of dense, coarse grain alumina at ultralow load, for example, 1 N, are still lacking. Therefore, the present study was conducted on a dense (∼95% of theoretical) coarse-grain (∼20 μm) alumina at a low peak load of 1 N with varying loading rates (10 −3 -10 0 N·s −1 ) applied in depth sensitive indentation experiments. The results showed profuse presence of multiple micro-pop-in and pop-out events possibly linked to dislocation nucleations underneath the indenter. The critical resolved shear stress (τ CRSS ) was found to enhance with the increase in applied loading rates. The occurrences of the localized shear deformation band formation and microcracking in and around the indentation cavity were explained in terms of the correlation between the nanoscale plasticity events, the small magnitude of (τ CRSS ), the maximum shear stress (τ max ) developed just underneath the indenter, and the dislocation loop radius (R d ).

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Effects of Cr2O3 addition on the mechanical properties, microstructure and wear performance of zirconia-toughened-alumina (ZTA) cutting inserts

Cited by 73 publications

References 19 publications

Effects of TiO2 addition on the phase, mechanical properties, and microstructure of zirconia-toughened alumina ceramic composite

Effects of TiO2 addition on the phase, mechanical properties, and microstructure of zirconia-toughened alumina ceramic composite

The relationship between microstructure and fracture toughness of zirconia toughened alumina (ZTA) added with MgO and CeO2

Contact Deformation of Alumina

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