Damage induced by monotonic and cyclic spherical indentation in polycrystalline diamond (PCD)

Marro, Fernando García; Mestra, A.; Jiménez‐Piqué, E.; Ozbayraktar, Serdar; Llanes, L.

doi:10.1016/j.ijrmhm.2014.09.007

Cited by 10 publications

(7 citation statements)

References 19 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Of the four plots of collated data from the literature, fracture toughness against binder content appears to be the strongest. There seems to be a strong negative relationship between the toughness and the amount of binder in the PCD which is surprising given that others have suggested [34] that the binder phase contributes a toughening effect. However, the interaction between cracks in PCD, the binder phase and the overall toughness of the material are likely much more complicated than this graph appears to show.…”

Section: Introductionmentioning

confidence: 90%

“…Despite this early work into single crystal and natural diamonds, it was not until 2015 that the technique was applied to PCD. Marro et al [34] performed Hertzian indentation on various grades of PCD under both monotonic and cyclic loading conditions. Although the technique of acoustic emission is reasonably well documented in the literature on Hertzian indentation, it was not used to detect fracture in this study.…”

Section: Flaw Size Distributionmentioning

confidence: 99%

“…The explanation given for the observed trend is derived from Rice's work stating that ‘thermal and elastic anisotropy between diamond and binder phases could result in high interfacial stresses that allow micro-cracks to propagate along the diamond-cobalt boundaries’. While high-residual stresses have been observed due to the thermal expansion mismatch of diamond and cobalt [33], fracture occurs predominantly transgranularly in PCD [34] so micro-cracks along the grain boundaries, if they do exist, have minimal effect on the fracture behaviour. He then goes on to say that other factors such as ‘impurities in the matrix material, the amount and size distribution of the secondary phase, and the degree of plastic deformation and fragmentation of diamond grains during synthesis’ could affect the fracture toughness.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

The influence of microstructure on the mechanical properties of polycrystalline diamond: a literature review

Scott

2017

Advances in Applied Ceramics

View full text Add to dashboard Cite

Polycrystalline diamond (PCD) is an extremely high-performance cutting tool material used in the machining of rock, high-strength, non-ferrous metal alloys and carbon-fibre-reinforced composites. It is favoured for its exceptional hardness and wear resistance which results in at least an order of magnitude improvement in performance over previous technologies in almost all metrics. However, PCD suffers from unpredictable brittle fracture and degradation at high temperature during service which limits its capabilities in cutting applications. The literature on the link between its microstructure and its mechanical properties, including strength, toughness and flaw size distribution as measured by pseudo-static tests, is investigated. The conclusions of the seminal paper on this topic are re-examined in the light of modern ceramics research and an alternative explanation is put forth for the strengthgrain size relationship published in this paper. All known literature values for strength and toughness vs. grain size and binder content are collated showing no overall trend in strength with binder content but moderate trends in all other combinations. The common claim of weak grain boundaries is brought into question in the light of the lack of any evidence of this fracture mode being evident in pseudo-static tests. The industrial literature on wear testing and failure modes of PCD in service and service-like tests is examined to bridge the gap between pseudo-static and dynamic, application-based experiments. Six main failure modes are recorded and summarised with intergranular fracture being the most conspicuously absent from the pseudo-static tests. It is suggested that the temperature generated by friction in dynamic tests causes the weakening of grain boundaries, resulting in a transition from transgranular to intergranular fracture and a call for further research in this area is made.

show abstract

Section: Introductionmentioning

confidence: 90%

Section: Flaw Size Distributionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

The influence of microstructure on the mechanical properties of polycrystalline diamond: a literature review

Scott

2017

Advances in Applied Ceramics

View full text Add to dashboard Cite

show abstract

“…Firstly, in the present diamond-SiC material system, diamond-diamond GBs are very rare, since the microstructure consists of single crystals of diamond usually encased in a SiC matrix, diamond grains bordering larger SiC crystals, or diamond grains coated or in contact with graphitic layers or inclusions. Secondly, experiments [ 22 , 94 , 95 ] and atomic simulations [ 96 ] indicate that polycrystalline diamond tends to fail by transgranular fracture, most often on

planes, rather than by intergranular fracture along diamond-diamond GBs.…”

Section: Phase Field Simulations: Grain Boundary Energy Distributimentioning

confidence: 99%

A Multi-Scale Approach for Phase Field Modeling of Ultra-Hard Ceramic Composites

et al. 2021

View full text Add to dashboard Cite

Diamond-silicon carbide (SiC) polycrystalline composite blends are studied using a computational approach combining molecular dynamics (MD) simulations for obtaining grain boundary (GB) fracture properties and phase field mechanics for capturing polycrystalline deformation and failure. An authentic microstructure, reconstructed from experimental lattice diffraction data with locally refined discretization in GB regions, is used to probe effects of local heterogeneities on material response in phase field simulations. The nominal microstructure consists of larger diamond and SiC (cubic polytype) grains, a matrix of smaller diamond grains and nanocrystalline SiC, and GB layers encasing the larger grains. These layers may consist of nanocrystalline SiC, diamond, or graphite, where volume fractions of each phase are varied within physically reasonable limits in parametric studies. Distributions of fracture energies from MD tension simulations are used in the phase field energy functional for SiC-SiC and SiC-diamond interfaces, where grain boundary geometries are obtained from statistical analysis of lattice orientation data on the real microstructure. An elastic homogenization method is used to account for distributions of second-phase graphitic inclusions as well as initial voids too small to be resolved individually in the continuum field discretization. In phase field simulations, SiC single crystals may twin, and all phases may fracture. The results of MD calculations show mean strengths of diamond-SiC interfaces are much lower than those of SiC-SiC GBs. In phase field simulations, effects on peak aggregate stress and ductility from different GB fracture energy realizations with the same mean fracture energy and from different random microstructure orientations are modest. Results of phase field simulations show unconfined compressive strength is compromised by diamond-SiC GBs, graphitic layers, graphitic inclusions, and initial porosity. Explored ranges of porosity and graphite fraction are informed by physical observations and constrained by accuracy limits of elastic homogenization. Modest reductions in strength and energy absorption are witnessed for microstructures with 4% porosity or 4% graphite distributed uniformly among intergranular matrix regions. Further reductions are much more severe when porosity is increased to 8% relative to when graphite is increased to 8%.

show abstract

“…caused by fatigue damage [17][18][19][20]; however, such a coating has a brittle characteristic nature and might not be sensitive to cyclic fatigue damage (compared with a ductile metal). On the other hand, the substrate was ductile stainless steel, which often undergoes cyclic plastic deformation [11,[21][22][23][24] This result will be discussed later.…”

Section: Cyclic Indentationmentioning

confidence: 99%

Failure assessment of a hard brittle coating on a ductile substrate subjected to cyclic contact loading

Toyama

Niwa

et al. 2015

Engineering Failure Analysis

View full text Add to dashboard Cite

Damage induced by monotonic and cyclic spherical indentation in polycrystalline diamond (PCD)

Cited by 10 publications

References 19 publications

The influence of microstructure on the mechanical properties of polycrystalline diamond: a literature review

The influence of microstructure on the mechanical properties of polycrystalline diamond: a literature review

A Multi-Scale Approach for Phase Field Modeling of Ultra-Hard Ceramic Composites

Failure assessment of a hard brittle coating on a ductile substrate subjected to cyclic contact loading

Contact Info

Product

Resources

About