Plastische Verformung von Einkristallen

Berner, Rolf; Kronmüller, H.

doi:10.1007/978-3-662-36729-2_2

Cited by 17 publications

(7 citation statements)

References 81 publications

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“…The data presented were associated with stage II deformation and early stage III deformation of the plastic flow. In pure aluminum, however, deformation stages appear to be weakly expressed even in a single-crystalline state [5]. Solid-solution-hardened alloys are more promising in this respect.…”

Section: Introductionmentioning

confidence: 98%

Kinetics of localized plastic flow during deformation and fracture of a D1 alloy

2007

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The stress-strain curve of a polycrystalline duralumine (D1) is studied to find three basic deformation stages: linear hardening, parabolic hardening (n = 1/2), and prefracture (n < 1/2). The results obtained show special features of macrolocalization of the plastic flow of the alloy under review. The distribution patterns of localized plastic flow domains develop according to deformation stages. The prefracture stage is characterized by selfcorrelated motion of the domains to the point of subsequent fracture. It follows from an analysis of the plastic flow localization kinetics that both hardening and softening domains coexist in the specimen in the prefracture stage. The domains move with a constant velocity inherent to each of them and linearly dependent on the position of their nucleation point.

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Section: Introductionmentioning

confidence: 98%

Kinetics of localized plastic flow during deformation and fracture of a D1 alloy

2007

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“…where k 0 and k arethe anglesbetween the shears ystem (dislocation slip ortwinning) direction,and the crystalorientation beforeand afterdeformation,respectively [7]. axisrotation ( Fig.…”

Section: Methodsmentioning

confidence: 99%

The influence of orientation and aluminium content on the deformation mechanisms of Hadfield steel single crystals

Астафурова

Киреева

Chumlyakov

et al. 2007

International Journal of Materials Research

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a Laboratory of strengthp hysicsand plasticity,S iberianPhysicalTechnicalInstitute,T omsk,R ussia b Lehrstuhl für Werkstoffkunde,U niversity of Paderborn,P aderborn,G ermany c Departmentof Mechanicaland IndustrialEngineering,U niversity of Illinois,U rbana-Champaign,I L, USA The influenceofo rientation and aluminium contenton the deformationm echanisms of Hadfield steelsingle crystals The lows tacking faultenergyand highcarbon contentin Hadfieldsteel make twinning the basicdeformation mechanismfrom the onsetof plasticdeformation in [1¯11]and [011]oriented single crystalsin tension at T = 77 -300 K.Alloyingwithaluminium( 2.7Ali nwt.%) results in ani ncreaseo fstacking faultenergyfrom 0.03 J·m 2 to0.05J·m -2 and movest winning toh igher degreesof deformation( e pl >15%). Inaluminium-free [1¯23]c rystalst winning startsafter2 0%strain.For[1¯23], [001]orientations,aluminiumadditionschangethe dislocation arrangementfrom auniformd istribution toaplanar dislocationarrangmentand alsosuppress twinning. Intersectionsof dislocation pile-upsw eref ound tobethe governing factorforhardening in the aluminium-alloyed [001] crystals.

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“…4c and 4d). After deformation to   40%, the strain hardening coefficient of the quenched and aged [144] crystals involved in twinning increases to 1200 and 1600 MPa, respectively, against its temperature-independent value Θ ~ 1000 MPa under slip deformation at 77-296 K [20]. The strain degree needed for the formation of multipoles and stacking faults at 77 K is lower in the aged [001] crystals than in the quenched ones (Fig.…”

Section: Tensile Behavior Of (Cocrfeni) 94 Ti 2 Al 4 Single Crystalsmentioning

confidence: 99%

“…At T > 373 K, it is weak, like G(T), and  cr shows its athermal  G component. Thus, the temperature dependence  cr (T) in the (CoCrFeNi) 94 Ti 2 Al 4 single crystals can be represented in the form [20]:…”

Section: Temperature Dependence Of Critical Shearmentioning

confidence: 99%

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Mechanical Behavior of Differently Oriented (CoCrFeNi)94Ti2Al4 Single Crystals

et al. 2021

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The paper analyzes the mechanical behavior and plastic deformation mechanisms (slip, twinning) in single-crystalline high-entropy fcc alloy (CoCrFeNi) 94 Ti 2 Al 4 (at %) in relation to the crystal orientation ([144] , [001]), type of deformation (tension, compression), and heat treatment (quenching, aging at 923 K for 4 h). The analysis shows that after aging at 923 K for 4 h, compared to quenching, the critical shear stress of such crystals increases by 20-30 MPa at 77-973 K due precipitated -phase particles of size 3-5 nm. The onset of their plastic flow, irrespective of the heat treatment, is associated with slip such that their critical shear stress depends neither on the crystal orientation nor on the type of deformation (tension, compression) at 77-973 K. When deformed at 77-973 K after quenching or aging, the [144] and [001] crystals reveal a planar structure with dislocation pileups. In the quenched and aged [144] crystals, twinning occurs after previous tensile slip deformation to 40% at 77 K. The stages of flow curves, the strain hardening coefficient, and the plasticity of the crystals are found to depend on their orientation, test temperature, and heat treatment. The dependences of the strain hardening coefficient of the crystals on their orientation and temperature in tension are discussed. A method is proposed for attaining a high yield strength in single-crystalline highentropy (CoCrFeNi) 94 Ti 2 Al 4 under tension at above 296 K.

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Plastische Verformung von Einkristallen

Cited by 17 publications

References 81 publications

Kinetics of localized plastic flow during deformation and fracture of a D1 alloy

Kinetics of localized plastic flow during deformation and fracture of a D1 alloy

The influence of orientation and aluminium content on the deformation mechanisms of Hadfield steel single crystals

Mechanical Behavior of Differently Oriented (CoCrFeNi)94Ti2Al4 Single Crystals

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