Nanowires: diameter-dependent strength criterion

Kafka, V.; Vokoun, D.

doi:10.1088/1757-899x/504/1/012110

Cited by 1 publication

(1 citation statement)

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“…The sample-size effect observed in the present study is based on the dislocation starvation theory [15] and the effect of grains close to the sample's surface since the volume ratio of surface grains increases with the sample size decrease. The theoretical background of the observed sample-size effect might be found also in [18].…”

Section: Resultsmentioning

confidence: 91%

Compression of Ecaped Titanium Micro-Pillars for Two Principal Orientations

Vokoun

Maňák

Tesař

et al. 2020

APP

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The thermomechanical processing by equal-channel angular pressing (ECAP) is used for certain metals and alloys in order to make their structure fine and to increase material strength. In the previous study done at our institute, grade 2 titanium was successfully processed using four consecutive route A passes via a 90 ° ECAP die with high backpressure at room temperature. Orientation dependence of compressive and tensile loading of ECAPed titanium samples was demonstrated at macro-scale. However, scarce attention has been paid so far to the mechanical behavior of ECAPed titanium samples at micro-scale. In the present study, compression experiments on titanium micropillars, fabricated using focused ion beam, are carried out for two main directions in respect to preceding ECAP pressing (insert and extrusion directions). The purpose of this study is to discuss the orientation dependence of mechanical response during compression of the as-ECAPed titanium micro-pillars.

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Section: Resultsmentioning

confidence: 91%