Manifestation of external size reduction effects on the yield point of nanocrystalline rhodium using nanopillars approach

Alshehri, Omar; Yavuz, Mustafa; Tsui, Ting Y.

doi:10.1016/j.actamat.2012.09.009

Cited by 10 publications

(6 citation statements)

References 36 publications

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“…( b ) A three-dimensional (3D) graph shows the relation of normalized resolved shear strength ( τ/G ) versus ( D versus d ) for the HEA pillars in this study, single-crystalline (sc) HEA11, bcc W2021, fcc Au18, Ni19 pillars and nanocrystalline (nc) Cu22, Ni23, Ni–W24, Pt44 and Rh45 pillars, with τ resolved shear strength and G the corresponding shear modulus. The Schmid factors of 0.417 and 0.5 are used for the bcc HEA pillar and the nc pillars in the available literature data, respectively.…”

Section: Figurementioning

confidence: 99%

Ultrastrong ductile and stable high-entropy alloys at small scales

2015

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Refractory high-entropy alloys (HEAs) are a class of emerging multi-component alloys, showing superior mechanical properties at elevated temperatures and being technologically interesting. However, they are generally brittle at room temperature, fail by cracking at low compressive strains and suffer from limited formability. Here we report a strategy for the fabrication of refractory HEA thin films and small-sized pillars that consist of strongly textured, columnar and nanometre-sized grains. Such HEA pillars exhibit extraordinarily high yield strengths of ∼10 GPa—among the highest reported strengths in micro-/nano-pillar compression and one order of magnitude higher than that of its bulk form—and their ductility is considerably improved (compressive plastic strains over 30%). Additionally, we demonstrate that such HEA films show substantially enhanced stability for high-temperature, long-duration conditions (at 1,100 °C for 3 days). Small-scale HEAs combining these properties represent a new class of materials in small-dimension devices potentially for high-stress and high-temperature applications.

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Section: Figurementioning

confidence: 99%

Ultrastrong ductile and stable high-entropy alloys at small scales

2015

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“…These observations suggest that the contribution from grains favorably oriented for basal slip (within a bimodal grain distribution randomly oriented without any preferential texture [17]) to the pillar strength decreases with decreasing pillar diameter. Additionally, by reducing pillar diameter the number of grain boundaries also decreases, [24] which significantly reduces the number of potential dislocation sources. [4] Hence, the applied stress required for nucleation or activation of dislocations, i.e.…”

Section: (E)-(h) Show 52mentioning

confidence: 99%

Size-Induced Strengthening in Nanostructured Mg Alloy Micropillars

Chang

Pozuelo

Yang

2014

Materials Research Letters

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“…The compressive yield strength of the TNZ 293 alloys was calculated from the averages of 3 samples for each alloy.294 As it is seen inFig. 5(indicated by blue arrow), the compressive 295 stress-strain graph of TNZ alloys display ''pre-deformation phe-296 nomenon''[58] which makes it impossible to use the 0.2% offset 297 approach for calculating the compressive yield strength of the 298 alloys. Consequently, ''two lines method''[58] was used to be able 299 to calculate the compressive yield strength of the alloys.…”

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confidence: 99%

“…54 Orthopedic biomaterials are implanted into human bodies in order 55 to heal bone tissue diseases developed due to aging, various con-56 genital defects in bone tissue, injuries to bone tissue and joints 57 from traffic and sports accidents [2,3]. 58 With the increasing utilization of orthopedic implant materials, 59 if biologically and mechanically compatible materials are not used 60 for implants, it is inevitable that the number of revision surgeries 61 will increase [4]. Genotoxic, cytotoxic, carcinogenic, mutagenic, 62 allergenic, neurological effects are taken into account while 63 evaluating the biological compatibility of an implant material [5].…”

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confidence: 99%