The Influence of Temperature on Slip Behaviour of Molybdenum Single Crystals Deformed in Tension in the Range from 293 to 573 °K .II. Slip Geometry and Structure of Slip Bands

Richter, Johannes

doi:10.1002/pssb.2220460118

Cited by 29 publications

(5 citation statements)

References 26 publications

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“…Ref. [29] for a-Fe and the detailed investigation by Richter [30] in Mo). These studies show the occurrence of slip on {112} and {123} planes, as well as of wavy slip in the MRSSP.…”

Section: Tablementioning

confidence: 98%

“…These studies show the occurrence of slip on {112} and {123} planes, as well as of wavy slip in the MRSSP. The slip traces are found to result in Mo from 'composite slip', that is, a composition of successive slip steps of variable magnitudes on various {110} planes ( [30], see also [31]). As the screw dislocation cores are very narrow in BCC metals, cross-slip should, indeed, be relatively easy in the athermal regime.…”

Section: Tablementioning

confidence: 99%

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Dislocation strengthening in FCC metals and in BCC metals at high temperatures

Madec

Kubin

2017

Acta Materialia

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International audienceTill now, it was widely believed that the dislocation strengthening coefficients used in the Taylor-like relation were universal for a given crystallographic class of materials. In the present study, it is shown that this is actually untrue because of two effects that influence the strength of interactions between slip systems, namely the value of the Poisson ratio and the occurrence of doubly degenerated, asymmetric, junction configurations. New strengthening coefficient values for reactions between slip systems were determined using dislocation dynamics simulations on five representative FCC metals, plus germanium, and on five BCC transition metals for {110} and {112} slip systems at high homologous temperatures. The value of the Poisson ratio affects all the strengthening coefficients to various extents ranging from small to substantial. The effects of configuration asymmetry and Poisson's ratio are more marked in BCC metals than in FCC metals. These two major effects arise from a number of concurring dislocation mechanisms, which are discussed in some detail. It is expected that the use of accurate material-dependent coefficients will notably improve the predictive ability of current models for strain hardening

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“…Ref. [29] for a-Fe and the detailed investigation by Richter [30] in Mo). These studies show the occurrence of slip on {112} and {123} planes, as well as of wavy slip in the MRSSP.…”

Section: Tablementioning

confidence: 98%

Section: Tablementioning

confidence: 99%

Dislocation strengthening in FCC metals and in BCC metals at high temperatures

Madec

Kubin

2017

Acta Materialia

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“…Another complication of modeling bcc metals is the ambiguity of slip planes on which dislocations move. Various techniques have been used to determine the slip plane of bcc metals, including trace analysis via microscopic observations [21][22][23], x-ray diffraction [21,24], kink pair theory [25][26][27] and atomistic simulations [3,[28][29][30][31]. Some of these studies indicate that slip can occur not only on {1 1 0} planes but also {1 1 2} or even {1 2 3} planes.…”

Section: Introductionmentioning

confidence: 99%

Application of generalized non-Schmid yield law to low-temperature plasticity in bcc transition metals

Lim¹,

Weinberger²,

Battaile³

et al. 2013

Modelling Simul. Mater. Sci. Eng.

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In this work, a generalized yield criterion that captures non-Schmid effects is proposed and implemented into a finite element crystal plasticity model to simulate plastic deformation of single and polycrystals. The parameters required for the constitutive formulation were calibrated to deformation experiments on single crystals. This model is used to investigate the effects of non-Schmid effects on the predictions of the stress–strain response and texture evolution in body-centered-cubic (bcc) metals. The non-Schmid contributions are required to accurately predict the stress–strain response of single crystals, and the concomitant non-associativity of the flow also increases the tendency of localization in polycrystal deformations.

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“…As a result, the cooling rate of the grown crystal after growth near the growth temperature was found to be 59.1 • C/h in the model without the afterheater, while it was 22.16 • C/h in the model with the afterheater. From the critical resolved shear stress (CRSS) at the slip plane, the criterion of slip formation of crystals becomes low as the temperature increases, and the slip easily forms at high temperatures under very-low stress levels [24,25]. To minimize the thermal residual stress, therefore, the annealing process at high temperatures near the melting point is known to be effective.…”

Section: Temperature Change Of Grown Crystals Near the Growth Tempera...mentioning

confidence: 99%

Influence of Active Afterheater in the Crystal Growth of Gallium Oxide via Edge-Defined Film-Fed Growing Method

Jeong,

Choi,

Lim

et al. 2023

Crystals

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In this study, we explored the effect of an active afterheater on the growth of gallium oxide single crystals using the EFG method. We analyzed the temperature distribution of the crystal under the growing process through multiphysics simulations of the models with and without an active afterheater and investigated the morphology of crystals by applying each model to real experimental growths. The afterheater is a component in the growing furnace that activates radiant heat transfer, and its performance depends on its location, size, material, and shape. The simulation results showed that the afterheater applied in this study was found to be effective in obtaining good temperature distribution in the reactor. Through experimental crystal growth corresponding to the simulation approaches, it was confirmed that an appropriate afterheater reduces thermal stress at the growth front and provides a thermal annealing effect on the post-grown crystals during the growing process to improve crystal quality.

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The Influence of Temperature on Slip Behaviour of Molybdenum Single Crystals Deformed in Tension in the Range from 293 to 573 °K .II. Slip Geometry and Structure of Slip Bands

Abstract: The slip line pattern of molybdenum single crystals deformed in tension at temperatures between 293 and 573 OK (T/T, = 0.1 to 0.2) was systematically investigated using optical and electron microscopy. The transition from parabolic stress-strain behaviour to three-

Cited by 29 publications

References 26 publications

Dislocation strengthening in FCC metals and in BCC metals at high temperatures

Dislocation strengthening in FCC metals and in BCC metals at high temperatures

Application of generalized non-Schmid yield law to low-temperature plasticity in bcc transition metals

Influence of Active Afterheater in the Crystal Growth of Gallium Oxide via Edge-Defined Film-Fed Growing Method

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