Luders band deformation in a fine grained aluminium alloy

Lloyd, D. J.; Morris, Larry R.

doi:10.1016/0001-6160(77)90170-5

Cited by 82 publications

(20 citation statements)

References 9 publications

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“…As an approximation, the Lu¨ders elongation is proportional to the reciprocal of grain size, i.e., the Lu¨ders elongation increases linearly with the reciprocal of grain size. [20,37] Figure 9(b) shows the relationship between Lu¨ders elongation and tensile strength. Clearly, the Lu¨ders elongation increases with increasing strength.…”

Section: Lu¨ders Deformationmentioning

confidence: 99%

“…[38] There is a general agreement that Lu¨ders deformation is a direct result of an avalanche increase in dislocation density in a few limited areas of the specimen gauge part. [37][38][39][40] Grain boundaries and triples points are believed to be the main dislocation sources for producing a high dislocation density, regardless of grain size. [37][38][39] It has been proposed that the primary formation mechanism of Lu¨ders bands was pure shearing.…”

Section: Lu¨ders Deformationmentioning

confidence: 99%

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Mechanical Behaviors of Ultrafine-Grained 301 Austenitic Stainless Steel Produced by Equal-Channel Angular Pressing

Huang

Yang

Wang

et al. 2010

Metall Mater Trans A

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The technique of equal-channel angular pressing (ECAP) was used to refine the microstructure of an AISI 301 austenitic stainless steel (SS). An ultrafine-grained (UFG) microstructure consisting mainly of austenite and a few martensite was achieved in 301 steel after ECAP processing for four passes at 523 K (250°C). By submitting the as-ECAP rods to annealing treatment in the temperature range from 853 K to 893 K (580°C to 620°C) for 60 minutes, fully austenitic microstructures with grain sizes of 210 to 310 nm were obtained. The uniaxial tensile tests indicated that UFG 301 austenitic SS had an excellent combination of high yield strength (>1.0 GPa) and high elongation-to-fracture (>30 pct). The tensile stress-strain curves exhibited distinct yielding peak followed by obvious Lu¨ders deformation. Measurements showed that Lu¨ders elongation increased with an increase in strength as well as a decrease in grain size. The microstructural changes in ultrafine austenite grains during tensile deformation were tracked by X-ray diffraction and transmission electron microscope. It was found that the strain-induced phase transformation from austenite to martensite took place soon after plastic deformation. The transformation rate with strain and the maximum strain-induced martensite were promoted significantly by ultrafine austenite grains. The enhanced martensitic transformation provided extra strain-hardening ability to sustain the propagation of Lu¨ders bands and large uniform plastic deformation. During tensile deformation, the Lu¨ders bands and martensitic transformation interacted with each other and made great contribution to the excellent mechanical properties in UFG austenitic SS.

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Section: Lu¨ders Deformationmentioning

confidence: 99%

Section: Lu¨ders Deformationmentioning

confidence: 99%

Mechanical Behaviors of Ultrafine-Grained 301 Austenitic Stainless Steel Produced by Equal-Channel Angular Pressing

Huang

Yang

Wang

et al. 2010

Metall Mater Trans A

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“…Second, coarse-grained 5083 Al exhibits strainnot widely present in fine-grained aluminum. [43,44] However, hardening, despite slight necking. Ma [56] attributed the lowmicrostructural analysis of cryomilled Al-7.5 pct Mg failed strain-hardening in UFG Fe to an absence of dislocation to reveal Lüders-bands in the gage sections, and they were multiplication and accumulation within ultrafine grains.…”

Section: Plastic Deformationmentioning

confidence: 99%

Mechanical properties of an ultrafine-grained Al-7.5 Pct Mg alloy

Han

Mohamed

Lee

et al. 2003

Metall Mater Trans A

138

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In the present study, the relationships between the structure and properties of a cryomilled Al-7.5 pct Mg alloy were investigated. The microstructure of the cryomilled Al-7.5 pct Mg alloy consisted of equiaxed grains with an approximate size of 300 nm. Thermal treatment had only a minor effect on microstructure, as evidenced by X-ray diffraction (XRD) and transmission electron microscopy (TEM) results. The tensile behavior was characterized by high strength, high ductility, and low-strain-hardening. The tensile deformation was relatively uniform, with limited necking deformation, and fracture surfaces were characterized by microdimples. The variation of strain rates from 4 и 10 Ϫ4 to 4 и 10 Ϫ2 s Ϫ1 had an insignificant effect on tensile behavior. Comparison of compressive and tensile behavior revealed similar moduli and yield strengths, although the postyield behavior was markedly asymmetric. The present results indicate that grain-size effects, solid-solution strengthening, Orowan strengthening, and dislocation strengthening contribute significantly to the properties of a cryomilled Al-7.5 pct Mg alloy.

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“…The solute interstitials such as C and N atoms are responsible for the formation of Lüders band by forming Cottrell atmosphere and locking dislocations [22][23][24][25]. The studied steels are multi-phased and composed of ferrite, austenite and even cementite in the warm rolled state.…”

Section: Discussionmentioning

confidence: 99%

Microstructures and Mechanical Properties of 7Mn Steel Manufactured by Different Rolling Processes

Luo

2017

Metals

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Abstract:We investigated both the microstructures and tensile properties of 7Mn steel, which was either hot-rolled, warm-rolled or cold-rolled before intercritical annealing at 700 • C for 5 h. It can be concluded that the warm-rolled and annealed microstructures are a kind of mixture of hot rolled and cold rolled ones. They are composed of ferrite and retained austenite, the latter having a wide size distribution and two types of morphologies: equiaxed and lamellar. These retained austenite grains are expected to transform to martensite in a more sustainable way-the warm-rolled and annealed steel exhibits the best combination of ultimate tensile strength and total elongation among the three studied steels and a shorter yield point elongation than the cold-rolled one.

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Luders band deformation in a fine grained aluminium alloy

Cited by 82 publications

References 9 publications

Mechanical Behaviors of Ultrafine-Grained 301 Austenitic Stainless Steel Produced by Equal-Channel Angular Pressing

Mechanical Behaviors of Ultrafine-Grained 301 Austenitic Stainless Steel Produced by Equal-Channel Angular Pressing

Mechanical properties of an ultrafine-grained Al-7.5 Pct Mg alloy

Microstructures and Mechanical Properties of 7Mn Steel Manufactured by Different Rolling Processes

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