Mechanical deformation of WC–Co composite micropillars under uniaxial compression

Tarragó, J.M.; Roa, J.J.; Jiménez‐Piqué, E.; Keown, E.; Fair, J.; Llanes, L.

doi:10.1016/j.ijrmhm.2015.07.015

Cited by 33 publications

(34 citation statements)

References 30 publications

(57 reference statements)

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“…The gap occurs in the Ni 3 Al binder phase very close to the WC/Ni 3 Al interface, leading to a nonsmooth tearing edge, which also indicates a good connection between WC and Ni 3 Al. These observations are very similar to those seen in WC–Co microcompression tests, suggesting that the metallic binder always accommodates more deformation despite the good connection with the WC matrix.…”

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confidence: 78%

Study on Strain Rate–Dependent Deformation Mechanism of WC–10 wt% Ni₃Al Cemented Carbide by Micropillar Compression

et al. 2019

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Herein, the strain rate–dependent deformation mechanism of WC–10 wt% Ni3Al cermet micropillars is studied by in situ uniaxial compression. The results show that compression at high strain rates exhibits a relatively smooth stress–strain response compared with that at low strain rates. Microstructural characterization suggests that at high strain rates, grain boundary sliding is the dominant mechanism of deformation, whereas at low strain rates, dislocation annihilation plays the dominant role. The strain rate sensitivity index also varies with the strain rate from 1 × 10−2 to 5 × 10−3 s−1, confirming that the dominant deformation mechanisms change in this range.

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confidence: 78%

Study on Strain Rate–Dependent Deformation Mechanism of WC–10 wt% Ni₃Al Cemented Carbide by Micropillar Compression

et al. 2019

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“…Csanádi et al [17] reported the deformation characteristics of WC by performing micropillar compression on particles oriented parallel and perpendicular to the basal plane. Trueba et al [18] showed the different cracking events that occur in a WC-Co grade when bending microbeams. Finally, Tarragó et al…”

Section: Accepted Manuscriptmentioning

confidence: 99%

“…deformation of both the indenter and the bulk material below the micropillar should be extracted using an approach derived by Sneddon [17,18], according to the following expression: xSneddon = (1-νi 2 /Ei)*(Fmeas/dt) + (1-νb 2 /Eb)*(Fmeas/db) (1) where xSneddon is the displacement corrected by the Sneddon's approach, Fmeas is the measured force, dt and db are the diameters of the micropillar at the top and bottom respectively; Young's modulus and Poisson's ratio of the diamond tip are Ei and νi, and taken to be 1140 GPa and 0.07 respectively [25]; and Young's modulus and Poisson's ratio of the bulk are Eb and νb, and taken to be 577 GPa and 0.24 respectively [26].…”

Section: Accepted Manuscriptmentioning

confidence: 99%

Scale effect in mechanical characterization of WC-Co composites

Sandoval

Rinaldi

Tarragó

et al. 2018

International Journal of Refractory Metals and Hard Materials

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© 2017 Elsevier LtdThe study of mechanical response of materials at small length scales has gained importance due to the recent advances in micro- and nano-fabrication as well as testing systems. However, most of the reported work has been dedicated to investigate single-crystals or boundary-containing metallic systems, while much less attention has been paid to composite materials, and in particular those combining soft and hard phases. In this work, a systematic procedure is followed for machining micropillars of diameters ranging from 1 to 4 µm in a WC-Co composite with a WC mean grain size around 1 µm, by means of focused ion beam milling. In-situ uniaxial compression of the micropillars and subsequent field emission scanning electron microscopy inspection were conducted. Clear size effects are evidenced. Smaller test specimens (probe size approaching the mean WC size) exhibit deformation/failure mechanisms observed for WC crystals; while for bigger sample sizes, the mechanical response involves several mechanisms directly linked with the microstructural characteristics of the bulk-like cemented carbide material. On the other hand, independent of micropillar size, carbide-carbide or carbide-binder interfaces are found to be preferential sites for nucleation of critical damage events.Peer ReviewedPostprint (author's final draft

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“…Such a condition is referred to as "typical" for defining the FCG threshold, as it is commonly found when the transition from the near-threshold regime to the intermediate stage is observed [33]. Inserting relatively high effective yield stress values (between 1 and 4 GPa [34][35][36][37][38]) in the above r c equation, together with those measured for ∆K I (between 4 and 15 MPa•m 1/2 ), a sub-micrometric size for the plastic region ahead of the crack tip, i.e., close to length scale of the binder mean free path of the studied cemented carbides, is attained. Third, both surface and subsurface inspection clearly highlights that, different from other extrinsically-toughened brittle materials, the strength lessening under cyclic loads of cemented carbides must be rationalized via the suppression of toughening mechanisms (developed under monotonic loading) rather than the degradation of them.…”

Section: Crack-microstructure Interaction Under Monotonic and Cyclic mentioning

confidence: 99%

In-Depth Understanding of Fatigue Micromechanisms in Cemented Carbides: Implications for Optimal Microstructural Tailoring

Llanes

2019

Metals

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The fatigue mechanics and mechanisms of cemented carbides (composites usually referred to as hardmetals) are reviewed. The influence of microstructure on strength lessening and subcritical crack growth for these ceramic-metal materials when subjected to cyclic loads are highlighted. The simultaneous role of the ductile metallic binder as a toughening and fatigue-susceptible agent for hardmetals results in a tradeoff between properties measured under monotonic and cyclic loading: fracture strength and toughness on one hand, as compared to fatigue strength and crack growth resistance on the other one. Toughness/fatigue–microstructure correlations are analyzed and rationalized on the basis of specific crack–microstructure interactions, documented by the effective implementation of advanced characterization techniques. As a result, it is concluded that the fatigue sensitivity of cemented carbides may be reduced if either toughening mechanisms beyond ductile ligament bridging, such as crack deflection, are operative, or strain localization within the binder is suppressed. In this regard, grades exhibiting metallic binders of a complex chemical nature and/or distinct microstructural assemblages are proposed as options for effective microstructural tailoring of these materials.

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Mechanical deformation of WC–Co composite micropillars under uniaxial compression

Cited by 33 publications

References 30 publications

Study on Strain Rate–Dependent Deformation Mechanism of WC–10 wt% Ni₃Al Cemented Carbide by Micropillar Compression

Study on Strain Rate–Dependent Deformation Mechanism of WC–10 wt% Ni₃Al Cemented Carbide by Micropillar Compression

Scale effect in mechanical characterization of WC-Co composites

In-Depth Understanding of Fatigue Micromechanisms in Cemented Carbides: Implications for Optimal Microstructural Tailoring

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Mechanical deformation of WC–Co composite micropillars under uniaxial compression

Cited by 33 publications

References 30 publications

Study on Strain Rate–Dependent Deformation Mechanism of WC–10 wt% Ni3Al Cemented Carbide by Micropillar Compression

Study on Strain Rate–Dependent Deformation Mechanism of WC–10 wt% Ni3Al Cemented Carbide by Micropillar Compression

Scale effect in mechanical characterization of WC-Co composites

In-Depth Understanding of Fatigue Micromechanisms in Cemented Carbides: Implications for Optimal Microstructural Tailoring

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Study on Strain Rate–Dependent Deformation Mechanism of WC–10 wt% Ni₃Al Cemented Carbide by Micropillar Compression

Study on Strain Rate–Dependent Deformation Mechanism of WC–10 wt% Ni₃Al Cemented Carbide by Micropillar Compression