Spatiotemporal characteristics of Portevin-Le Chatelier effect in Ti-Mo alloys under thermo-mechanical loading

Luo, Shiyuan; Castany, Philippe; Thuillier, Sandrine; Huot, Makara

doi:10.1016/j.msea.2018.07.022

Cited by 12 publications

(5 citation statements)

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“…Most models explaining Portevin-Le Chatelier (PLC) effects are based on the assumption that discontinuous deformation is the result of dynamic strain aging caused by the interaction between mobile dislocations and diffusing impurity atoms [21]. In addition to the typical mechanisms based on the interaction of dislocations and impurity atoms, there are many other interpretations of the PLC effect [22]. In particular, in Ref.…”

Section: Introductionmentioning

confidence: 99%

Kinetics of Plastic Deformation Localization Bands in Polycrystalline Nickel

Баранникова

Nadezhkin

2021

Metals

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Jerky flow has recently aroused interest as an example of complex spatiotemporal dynamics resulting from the collective behavior of defects in Al- and Mg-based alloys under loading. This paper presents the results of the study of the macroscopic strain localization kinetics in Nickel 200 (99.5 wt % purity). Uniaxial tension of flat samples is monitored at room temperature in the load–unload mode at a constant strain rate and total deformation increment up to 5%. The stress–strain curves reveal jerky flow from the yield point to the formation of the neck. The digital speckle correlation method evidences the movement of localized plastic deformation bands under the conditions of the Portevin–Le Chatelier effect (PLC). It is shown that stress drops during jerky flow in Ni are accompanied by the formation of morphologically simple single PLC bands. It is established that, with an increase in total deformation, the number of PLC bands and their velocity of motion along the sample decrease, while their time period increases. Moreover, an increase in total deformation leads to an increase in the parameters of the force response (i.e., time period and stress drop magnitude). It is found that the criterion of damage for PLC bands as a function of the total strain has a sigmoidal shape.

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Section: Introductionmentioning

confidence: 99%

Kinetics of Plastic Deformation Localization Bands in Polycrystalline Nickel

Баранникова

Nadezhkin

2021

Metals

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“…Luo et al [9] investigated the PLC effect and the band formation in titanium alloys Ti-12Mo and Ti-15Mo under the uniaxial tension, at 0.001 s -1 strain rate and within 25-350 °С temperature range. It was found that the amplitude of the strain drops positively correlated with the temperature and negatively correlated with deformation and the molybdenum content, while the number of the strain drops showed an opposite tendency.…”

Section: Introductionmentioning

confidence: 99%

Loading Velocity and Kinetics of Localized Bands of Nickel Plastic Deformation

Nadezhkin

Баранникова

2021

Russ Phys J

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The paper considers macroscopic plastic deformation localized in pure nickel NP2 (99.5%). Uniaxial tension of plane specimens is conducted at room temperature and loading velocities of 0.05, 0.2 and 0.8 mm/min. Stress-strain curves demonstrate a discontinuous yielding from the yield strength to necking. Digital image correlation and tracking is used to measure the total displacement and plastic strains in the conditions of the Portevin-Le Chatelier effect. It is shown that the loading velocity affects the band propagation velocity induced by localized deformation during tension. The inverse relationship is identified between the propagation velocity of localized deformation bands and the total displacement.

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“…Besides, the microstructure of water-quenched tensile samples is analyzed by optical micrographs (OM) and X ray diffraction (XRD) with Cu Kα1 radiation (λ = 0.154060 nm) using a Philips PW3710 diffractometer. Note that the details of OM sample preparation processes are described by Luo et al [69]. Figs.…”

Section: Introductionmentioning

confidence: 99%

“…4(d) that type C bands appear at random intervals along the gauge length in Ti-10Mo alloy for the experimental condition (350 °C & 10 -4 s -1 ). In general, the type of PLC bands is related to the spatial coupling force [69]. Fig.…”

Section: Introductionmentioning

confidence: 99%

“…Prior to tensile tests, using a heating rate of 10 °C s -1 , samples are heated to 250 °C or 350 °C followed by holding under isothermal conditions during 10 s. The strain field is measured continuously on the specimen surface by two digital cameras with a rate of 10 frames per second, and the fluctuations of temperature are maintained within 2 °C until rupture. Furthermore, two half contact AISI 304 stainless steel grips are employed to hold tensile samples instead of the full contact copper grips used in[69], thereby leading to a much smaller temperature gradient along the tensile direction during the whole test. Thus, a relatively larger area at the specimen center with a length of 10 mm is chosen to observe PLC effect, where the temperature heterogeneity is less than 11.2%, as shown inFig.…”

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confidence: 99%

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Microstructure, thermo-mechanical properties and Portevin-Le Chatelier effect in metastable β Ti-xMo alloys

Luo

Castany

Thuillier

2019

Materials Science and Engineering: A

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The microstructure, mechanical properties and Portevin-Le Chatelier (PLC) effect in Ti-xMo alloys (x=10, 12, 15 and 18 wt%), in the temperature range of 250-350 °C with strain rates from 10-3 s-1 to 10-4 s-1 , are systematically investigated in tension by using transmission electron microscopy and Gleeble 3500 testing machine combined with a digital image correlation technique. Results show that Young modulus decreases with increasing Mo contents, which is related to a more stable β phase matrix and a decrease of ω phase fraction. Moreover, the values of Young modulus and 0.2% offset yield strength at elevated temperature are higher than the ones at room temperature in all the Ti-xMo alloys, except the Ti-18Mo alloy which shows an opposite result. These macroscopic features are consistent with the ω phase precipitation in deformed Ti-xMo alloys, due to the combined effects of ω phase strengthening and temperature softening. Furthermore, the serration type transforms from A to A+B, then to B and eventually to C as increasing temperature and decreasing strain rate as well as Mo contents, which mainly depends on the spatial cohesion of PLC bands influenced by the intensity of ω precipitate-dislocation interactions. Finally, the peak value of maximum stress drop magnitude appears in Ti-12Mo alloy and increases with decreasing the strain rate, which is attributed to a stronger intensity of ω precipitate-dislocation interactions caused by reducing dislocations movement and

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Spatiotemporal characteristics of Portevin-Le Chatelier effect in Ti-Mo alloys under thermo-mechanical loading

Cited by 12 publications

References 53 publications

Kinetics of Plastic Deformation Localization Bands in Polycrystalline Nickel

Kinetics of Plastic Deformation Localization Bands in Polycrystalline Nickel

Loading Velocity and Kinetics of Localized Bands of Nickel Plastic Deformation

Microstructure, thermo-mechanical properties and Portevin-Le Chatelier effect in metastable β Ti-xMo alloys

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