Crack Orientation Dependence for Fatigue Behavior of Magnesium Single Crystals

Iida, Naomi; Ando, Shinji; Tsushida, Masayuki; Kitahara, Hiromoto; Tonda, Hideki

doi:10.4028/www.scientific.net/kem.345-346.307

Cited by 5 publications

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“…In a fatigue experiment of Mg single crystals, twinning-detwinning was observed but detwinning was not extensive [14]. Recently, fatigue crack growth in Mg single crystals with various crystal orientations was studied both experimentally [15][16][17][18][19] and theoretically using molecular dynamics [20]. No experimental work has ever been carried out to study the cyclic deformation and fatigue of Mg single crystals oriented for easy twinning or non-basal slip.…”

Section: Introductionmentioning

confidence: 99%

Direct observation of twinning–detwinning–retwinning on magnesium single crystal subjected to strain-controlled cyclic tension–compression in [0 0 0 1] direction

Zhang

Jiang

2011

Philosophical Magazine Letters

140

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2011) Direct observation of twinning-detwinning-retwinning on magnesium single crystal subjected to strain-controlled cyclic tension-compression in [0 0 0 1] direction, Philosophical Magazine Letters, 91:12, 757-765, Cyclic deformation of magnesium single crystal under fully reversed tension-compression along the [0 0 0 1] direction at a strain amplitude of 0.5% was investigated in ambient air. In situ light microscopy of f1 0 1 2g twins was conducted on the ð1 0 1 0Þ prismatic plane. Fundamental morphology evolution of twinning-detwinning-retwinning was characterized in situ. The critical resolved shear stress of f1 0 1 2g twinning was found to be $2.4 MPa. With increasing loading cycles, the activity of twinningdetwinning-retwinning exhausted and the residual twins accumulated. During detwinning at each loading cycle, the residual twins were observed to form on the vicinities of twin boundaries which had been fully expanded at the previous tensile peak. Microcracks were found on the boundaries of residual twins and the basal slip bands.

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Section: Introductionmentioning

confidence: 99%

Direct observation of twinning–detwinning–retwinning on magnesium single crystal subjected to strain-controlled cyclic tension–compression in [0 0 0 1] direction

Zhang

Jiang

2011

Philosophical Magazine Letters

140

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“…However, as HCP metals are known to show greater crystal orientation dependence on deformation behavior compared to cubic metals, deformation mechanisms have been studied using HCP single crystals. Tensile tests, 1,2) compression tests, 3) pure shear tests, 4) and fatigue tests 5,6) of HCP single crystals have been conducted to investigate such deformation mechanisms. These studies have discovered activated slip systems, twin systems, and critical resolved shear stress (CRSS).…”

Section: Introductionmentioning

confidence: 99%

Roles of Slip and Twinning on Indentation Formations in Magnesium Alloy Single Crystals

et al. 2020

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Indentation tests using a spherical indenter were applied to six hexagonal close-packed structure single crystals-pure Mg, Mg0.5 at%Al, Mg0.5 at%Zn, Mg0.5 at%Y, Mg0.9 at%Y, and pure Zn single crystals to investigate the roles both slips and twinning induce on the formation of indentation. When indented on (0001), all single crystals displayed circular morphology without slip lines or twins. Mg and Mg alloys' indentation sizes were found dependent on critical resolved shear stress (CRSS) for basal slip in (0001) indentations, while Zn (0001) indentation size depends on CRSS for both basal and second order pyramidal slips. Conversely, when indented on ð10 10Þ and ð1 210Þ, all single crystals displayed indentations elongated to [0001] surrounded by basal slip lines. Also, f10 12g twins were observed in Mg0.5 at%Al and Mg 0.5 at%Zn but were scarce in MgY. Pure Zn displayed second order pyramidal slips. Sizes of both ð10 10Þ and ð1 210Þ indentations were found dependent on CRSS for basal slips and for f10 12g twins.

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Three-dimensional in situ observations of short fatigue crack growth in magnesium

et al. 2011

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International audienceThree-dimensional (3D) short fatigue crack growth behaviour in a cast magnesium alloy, Elektron 21, was studied using a combination of X-ray diffraction contrast tomography (DCT) and microtomography at the European Synchrotron Radiation Facility. A 3D map of grain shapes and crystallographic orientations was produced in a miniature fatigue specimen using DCT. A focused ion beam instrument was used to introduce small notches in selected grains. Synchrotron microtomography was used to study the evolution of fatigue cracks from these notches during interrupted in situ fatigue cycling. Stage I crack growth occurred preferentially on the basal plane of the magnesium hexagonal close packed crystal, with local crack growth rates between 4 and 40 nm cycle 1. Retardations in the local crack growth rate were observed in certain grains and at certain grain boundaries. The observed interactions between the crack and the polycrystalline microstructure can be explained using Schmid factors and a development of the tilt-twist model of Zhai and Wilkinson (Zhai T, Wilkinson AJ, Martin JW. Acta Mater 2000;48;4917)

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Crack Orientation Dependence for Fatigue Behavior of Magnesium Single Crystals

Cited by 5 publications

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Direct observation of twinning–detwinning–retwinning on magnesium single crystal subjected to strain-controlled cyclic tension–compression in [0 0 0 1] direction

Direct observation of twinning–detwinning–retwinning on magnesium single crystal subjected to strain-controlled cyclic tension–compression in [0 0 0 1] direction

Roles of Slip and Twinning on Indentation Formations in Magnesium Alloy Single Crystals

Three-dimensional in situ observations of short fatigue crack growth in magnesium

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