Micropillar compression deformation of single crystals of α-Nb5Si3 with the tetragonal D8l structure

Kishida, Kyosuke; Maruyama, Toshisuke; Fukuyama, Takayoshi; Inui, Haruyuki

doi:10.1080/14686996.2020.1855065

Cited by 9 publications

(1 citation statement)

References 41 publications

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“…This clearly indicates that plastic flow observed at room temperature in the vicinity of micro-hardness indents in transition-metal diborides in the early studies 18 – 22 is due to small-scale plasticity that does not occur in bulk but often occurs in small volume of brittle material even at temperatures well below the brittle-ductile transition temperature 26 – 31 . Micropillar compression testing that utilizes specimen of micrometer size 32 – 34 has increasingly been known in recent years to offer one of the best ways to investigate such small-scale plasticity of brittle materials with many accumulated examples 35 – 43 . Indeed, Csanadi et al 44 recently utilized micropillar compression testing and confirmed plastic flow occurring by the operation of {1 00}<11 3> (prism a + c ) slip in ZrB 2 at room temperature.…”

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confidence: 99%

Room-temperature deformation of single crystals of ZrB2 and TiB2 with the hexagonal AlB2 structure investigated by micropillar compression

Chen

Paul

Majumdar

et al. 2021

Sci Rep

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The plastic deformation behavior of single crystals of two transition-metal diborides, ZrB2 and TiB2 with the AlB2 structure has been investigated at room temperature as a function of crystal orientation and specimen size by micropillar compression tests. Although plastic flow is not observed at all for their bulk single crystals at room temperature, plastic flow is successfully observed at room temperature by the operation of slip on {1$${\bar{1}}$$ 1 ¯ 00}<11$${\bar{2}}$$ 2 ¯ 3> in ZrB2 and by the operation of slip on {1$${\bar{1}}$$ 1 ¯ 00}<0001> and {1$${\bar{1}}$$ 1 ¯ 00}<11$${\bar{2}}$$ 2 ¯ 0> in TiB2. Critical resolve shear stress values at room temperature are very high, exceeding 1 GPa for all observed slip systems; 3.01 GPa for {1$${\bar{1}}$$ 1 ¯ 00}<11$${\bar{2}}$$ 2 ¯ 3> slip in ZrB2 and 1.72 GPa and 5.17 GPa, respectively for {1$${\bar{1}}$$ 1 ¯ 00}<0001> and {1$${\bar{1}}$$ 1 ¯ 00}<11$${\bar{2}}$$ 2 ¯ 0> slip in TiB2. The identified operative slip systems and their CRSS values are discussed in comparison with those identified in the corresponding bulk single crystals at high temperatures and those inferred from micro-hardness anisotropy in the early studies.

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Section: Introductionmentioning

confidence: 99%

Room-temperature deformation of single crystals of ZrB2 and TiB2 with the hexagonal AlB2 structure investigated by micropillar compression

Chen

Paul

Majumdar

et al. 2021

Sci Rep

Self Cite

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Unveiling the Intricacies of a Ductile‐Phase Toughened Intermetallic: An In‐Depth Exploration of a Eutectic Mo–Si–Ti Alloy and its Mechanical Behavior

Vikram,

Aramanda,

Schliephake

et al. 2024

Adv Eng Mater

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In this work, we present the development of directional solidification for a novel high‐temperature Mo‐20Si‐52.8Ti (at. %) ternary alloy using a modified Bridgeman type apparatus. The resulting alloy exhibits a microstructure consisting of a body‐centered cubic solid solution BCCss and a hexagonal silicide (Ti,Mo)5Si3 with approximate volume fractions of 50% for each phase. The phases exhibit a crystallographic orientation relationship with and . Different solidification velocities were imposed which revealed an inverse relationship to the lamellar spacing according to a Jackson‐Hunt type scaling. Mechanical characterization using Vickers indentation demonstrated that the BCCss accommodates plasticity through dislocation mediation, while the silicide phase exhibits high hardness and brittleness, serving as a crack initiation site. Crack propagation was arrested and deflected at the interface to the BCCss. Fracture toughness measurements via indentation yield a fracture toughness of 3.7 MPa√m for the silicide, somewhat higher than previously reported values for Si‐ and Cr‐based intermetallics. The directionally solidified (DS) specimens showed an enhanced fracture toughness attributed to a greater BCCss length scale; thus, combining the ductile and hard phases resulted in a ductile‐phase toughened intermetallic composite. The findings open up new possibilities for the design of advanced intermetallic composites with improved toughness performance.This article is protected by copyright. All rights reserved.

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Room-temperature deformation of single crystals of transition-metal disilicides (TMSi2) with the C11b (TM = Mo) and C40 (TM = V, Cr, Nb and Ta) structures investigated by micropillar compression

et al. 2022

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Micropillar compression deformation of single crystals of α-Nb₅Si₃ with the tetragonal D8_l structure

Cited by 9 publications

References 41 publications

Room-temperature deformation of single crystals of ZrB2 and TiB2 with the hexagonal AlB2 structure investigated by micropillar compression

Room-temperature deformation of single crystals of ZrB2 and TiB2 with the hexagonal AlB2 structure investigated by micropillar compression

Unveiling the Intricacies of a Ductile‐Phase Toughened Intermetallic: An In‐Depth Exploration of a Eutectic Mo–Si–Ti Alloy and its Mechanical Behavior

Room-temperature deformation of single crystals of transition-metal disilicides (TMSi2) with the C11b (TM = Mo) and C40 (TM = V, Cr, Nb and Ta) structures investigated by micropillar compression

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