Study on the out-of-plane deformation of the Portevin–Le Chatelier band by using digital shearography

Fu, Shaojing; Gao, Yue; Cai, Yong; Cheng, Teng; Zhang, Qingchuan; Wu, Xiaoping

doi:10.1016/j.measurement.2015.05.002

Cited by 10 publications

(3 citation statements)

References 30 publications

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“…Concerning the spatial aspect, bands of localized deformation (PLC bands), associated to the jerky flow, are generally classified as type A-continuous propagation [45], type B-hopping propagation [46] and type C-random nucleation [47]. The band propagation is usually observed by four methods including digital image correlation (DIC) [48], digital speckle pattern interferometry [49], infrared thermography [50] and shadowgraph [51]. Casarotto et al found that the required strain rate for type A is relatively higher in Al-3Mg (wt%) alloy than the one for type B [52].…”

Section: Introductionmentioning

confidence: 99%

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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Section: Introductionmentioning

confidence: 99%

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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“…However, different types of bands, usually classified as A, B and C, may appear depending on the strain rate. The orientation angle is more or less constant and bands may rotate suddenly during deformation with respect to the loading direction [5]. In simple shear, bands are initially parallel to the direction of the applied load, then rotate progressively and propagate normally to the applied shear direction.…”

Section: Introductionmentioning

confidence: 99%

Investigation of Portevin-Le Châtelier effect during Erichsen test

et al. 2019

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This study deals with the occurrence and numerical prediction of Portevin-Le Châtelier (PLC) instabilities during a forming process at room temperature. In a first part, the mechanical behavior of an aluminium alloy (5000 series) thin sheet is investigated in tension and simple shear under quasi-static conditions and at room temperature. As PLC effect takes place, jerky flow and bands of localised deformation, observed by digital image correlation, are clearly evidenced. A forming process, consisting of the mechanical bulging of a blank clamped between a die and a blank-holder with a hemispherical punch (Erichsen test), is then performed, using in-situ observation of the localised deformation bands and their propagation. In a second part, material parameters of McCormick's model are identified considering both tensile and simple shear tests. Moreover, Hill'48 yield criterion is used to represent the material anisotropy. Finally, the numerical simulation of the Erichsen test is performed with McCormick's model and the comparison of the load and band propagation with experiments shows a good prediction of plastic instabilities during a forming test.

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“…On the other hand, for the analysis of the spatial aspect, PLC bands were mainly observed by using four technologies as follows: shadowgraph [30], digital speckle pattern interferometry [31], digital image correlation [32] and infrared thermography [33]. Moreover, the propagation characteristics of PLC bands can be classified as type A, B and C, corresponding to continuous propagation, hopping propagation and random nucleation, respectively [34][35][36].…”

Section: Introductionmentioning

confidence: 99%

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

Luo

Castany

Thuillier

et al. 2018

Materials Science and Engineering: A

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The Portevin-Le Chaterlier (PLC) effect in Ti-12Mo and Ti-15Mo alloys has been investigated by using uniaxial tensile tests in a temperature range of 25-350 ℃ with an applied strain rate of the order of 10 -3 s -1 , coupled with a digital image correlation (DIC) method. The experimental results show an increase of the yield stress from 25°C to 250°C followed by a decrease. Moreover, PLC effect occurs above 250°C and stress drop magnitude increases while the number of stress drops per unit time decreases with increasing the strain and temperature as well as decreasing Mo contents. These macroscopic features are related to the reduced intensity of interactions between ω phase particles and mobile dislocations as decreasing temperature and increasing Mo contents. Furthermore, a relatively higher temperature and lower Mo content tend to weaken the spatial cohesion of propagation bands and strengthen strain localization, leading to a change of PLC bands from type A to type B and the increase of strain rate within the PLC bands, which are related to the increased precipitation of ω phases.Additionally, the elongation at fracture is significantly influenced by PLC effect in Ti-Mo alloys.

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Study on the out-of-plane deformation of the Portevin–Le Chatelier band by using digital shearography

Cited by 10 publications

References 30 publications

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

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

Investigation of Portevin-Le Châtelier effect during Erichsen test

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

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