Effect of crystal orientation on the strengthening of iron micro pillars

Rogne, Bjørn Rune Sørås; Thaulow, Christian

doi:10.1016/j.msea.2014.10.067

Cited by 33 publications

(3 citation statements)

References 53 publications

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“…Consequently, this method has become more attractive and very popular for investigating the size effect dependence of various materials. Moreover, fundamental approaches were tried to understand the size effect dependence and deformation behaviors of small-sized materials and specially focused on different lattice types of materials such as FCC (8,(14)(15)(16)(17)(18), BCC (19)(20)(21)(22)(23), hexagonal close-packed (HCP) (24,25), metallic glasses (26-28) and nanocrystalline materials (29). The FCC metal pillars under compression exhibited a universal power-law relation between pillar diameter and strength.…”

Section: Materials Used and Pillar Preparationmentioning

confidence: 99%

Size Dependent Compressive Strength of FIB Machined Single Crystal Manganese Pillars

Yılmaz,

Alkan,

Budak

2024

Hittite Journal of Science and Engineering

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The deformation behavior of single crystals of manganese pillars generated by focused ion beam (FIB), with diameters ranging from ~1 m to ~4.5 m, has been studied as a function of specimen size using micropillar compression at ambient temperature. The manganese pillars were machined from randomly chosen larger grains of polycrystalline metal. At ambient temperature, single crystals of manganese display chaotic slip planes emerging on the sample surface and brittle plastic deformation when the sample size is decreased to the micrometer scale. The manganese pillars reached very high flow stresses in the range of 4-5.6 GPa. The stress-strain curves of all tested manganese pillars demonstrated significant work hardening and smooth flow behavior, with strains up to 8-10%. After 10% strain, however, the flow stresses remained constant with no work hardening. As previously reported, the manganese pillars with undetermined orientation demonstrated a less pronounced size effect (-0.14) by the size effect exponent of BCC pillars.

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Section: Materials Used and Pillar Preparationmentioning

confidence: 99%

Size Dependent Compressive Strength of FIB Machined Single Crystal Manganese Pillars

Yılmaz,

Alkan,

Budak

2024

Hittite Journal of Science and Engineering

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“…This approach opens an opportunity to experimentally confirm the assumed mechanism of the improved room temperature ductility of the 18Cr ferritic stainless steels by adding the stabilizing elements. However, there are a few reports on micropillar compression tests applied for ferrous materials, [18][19][20][21] regardless of various reports on single-crystal micropillars of pure bcc metals (Cr, Nb, W and Ta). [22][23][24][25][26][27][28] In micro-mechanical testing, size-dependent strength of microscale specimens (smaller is stronger) is generally known in bcc pure metals.…”

Section: Strain Rate Sensitivity Of Flow Stress Measured By Micropillmentioning

confidence: 99%

Strain Rate Sensitivity of Flow Stress Measured by Micropillar Compression Test for Single Crystals of 18Cr Ferritic Stainless Steel

Tianqi

Takata

et al. 2020

ISIJ Int.

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We have fabricated cylindrical single-crystal micropillars with different diameter (d) ranges of 2-3 μm and 5-6 μm on a specific grain in the 18Cr ferritic stainless steel with a ferrite single-phase microstructure. The initial strain rate at the onset of plastic deformation was controlled by variable loading rate in the used nanoindenter. The strain rate sensitivity of the stress required for the slip initiation were examined using the fabricated micropillars. The present compression tests addressed the shear stress on an activated single slip system of micron-scale single-crystals. Smaller-sized micropillars (d = 2-3 μm) often exhibit intermittent strain bursts. The stress for slip initiation (after an elastic loading) changes depending on the initial strain rate, resulting in a high strain rate sensitivity (m) of 0.12. Larger-sized micropillars (d = 5-6 μm) show a continuous yielding. A slight change in their yield stress depending on the initial strain rate provides a relatively low m of 0.04. It is similar to one of the millimeter-sized specimens measured by conventional tensile tests. These results provide new insights to optimize the specimen size for the micropillar compression test applied for the 18Cr ferritic stainless steels.

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“…Although there are 48 potentially active slip systems in this material of the type; <111>{110}, <111>{211} and <111>{123}, for computational efficiency only 12 slip systems are considered in this model of the type <111>{110}. These slip systems are the primary systems in BCC structures according to Du et al, 2018 andRogne &Thaulow, 2015, where it has been shown that under unconstrained loading (micro-tensile and micropillar compression tests, respectively) primary slip in BCC structures occurs mainly on these slip systems. Du et al, 2018 show that under constrained loading primary or secondary slip can occur on the <111>{211} systems, with no evidence found of slip occurring on the <111>{123} system.…”

Section: Microscale Modellingmentioning

confidence: 99%

Experimental study and multiscale modelling of the high temperature deformation of tempered martensite under multiaxial loading

Meade

Sun

Tiernan

et al. 2018

Materials Science and Engineering: A

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Effect of crystal orientation on the strengthening of iron micro pillars

Cited by 33 publications

References 53 publications

Size Dependent Compressive Strength of FIB Machined Single Crystal Manganese Pillars

Size Dependent Compressive Strength of FIB Machined Single Crystal Manganese Pillars

Strain Rate Sensitivity of Flow Stress Measured by Micropillar Compression Test for Single Crystals of 18Cr Ferritic Stainless Steel

Experimental study and multiscale modelling of the high temperature deformation of tempered martensite under multiaxial loading

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