Adiabatic shear localization in pure titanium deformed by dynamic loading: Microstructure and microtexture characteristic

Jiang, Yanghui; Chen, Zhiyong; Chen, Zhan; Chen, Tao; Wang, Renke; Liu, Chuming

doi:10.1016/j.msea.2015.06.028

Cited by 34 publications

(7 citation statements)

References 25 publications

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“…Phase transformation was also a typical characteristic in the SB of high alloying near beta titanium alloy Ti-1300 at dynamic loading conditions [10]. It was a consensus that rotational dynamic recrystallization contributed to the kinetics possibility in the generation of ultrafine equiaxed grains in the SB, especially for titanium [11] and titanium alloy [12][13][14]. The previous research [15] mainly focused on the width of the SB and the grain refinement induced by rotational dynamic recrystallization mechanism in the SB in the Ti-55511 titanium alloy.…”

Section: Materials and Experimentsmentioning

confidence: 96%

Nanoindentation and Microstructure in the Shear Band in a Near Beta Titanium Alloy Ti-5Al-5Mo-5V-1Cr-1Fe

Wang

Mao

et al. 2019

Materials

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Shear localization is the main deformation mode for the near beta titanium alloy Ti-5Al-5Mo-5V-1Cr-1Fe loaded at high strain rates at either room temperature or cryogenic temperature. Nanoindentation, transmission electron microscopy, and high-resolution electron microscopy technique are applied to character the microstructure features and mechanical properties in the shear band of near beta titanium alloy. A white and straight band is observed in the shear region. Both microhardness and nanoindentaion hardness in the shear region are inferior to those in matrix. The different microstructure in the edge and the center in the shear band contribute to different mechanical properties. The plasticity of the entire shear band is almost homogenous when specimens are deformed at the cryogenic temperature. Rotational dynamic recrystallization is responsible for the formation of the ultrafine grains in the shear band. The edge of the shear band is composed of elongated grains, while there are ultrafine equiaxed grains in the center of the shear band. Deformation temperature has significant influence on the process of the grain refinement and the phase transformation in the shear band (SB). The grain sizes of the shear band in the specimen deformed at room temperature are larger than those in the specimens deformed at cryogenic temperature. The shear band consists of α phase grains in the specimen deformed at room temperature, and the shear band consists of α phase and lath-like α′ phase grains in the specimen deformed at cryogenic temperature. Finally, the mechanisms for phase transformation in the shear band are illustrated.

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Section: Materials and Experimentsmentioning

confidence: 96%

Nanoindentation and Microstructure in the Shear Band in a Near Beta Titanium Alloy Ti-5Al-5Mo-5V-1Cr-1Fe

Wang

Mao

et al. 2019

Materials

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“…Изменения микроструктуры после УЗС зависят от режимов обработки, исходной микроструктуры и свойств (механических и физических) свариваемых металлов и могут быть весьма разнообразны: наблюдали как существенное измельчение зерен [7][8][9], так и их рост [23; 25; 26], формирование микротекстуры сдвига [25][26][27] и рекристаллизации [7][8][9]. Закономерности структурных изменений при УЗС остаются предметом дискуссии и требуют систематического изучения.…”

Section: обсуждение результатовunclassified

Microstructure and strength of joints of nickel sheets produced by ultrasonic welding

Shayakhmetova¹,

Murzinova²,

Назаров³

2021

Vektor nauki Tol'yattin. gos. univ.

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Ultrasonic welding (USW) is one of the methods for producing solid-phase joints of thin metal sheets, which in the future can be used to obtain laminated composite materials, for additive manufacturing and renovation of metallic articles. The quality of joints depends on both the processing conditions and the properties of welded metals and alloys. At present, the USW conditions, the properties, and structure of weld joints of strong metals, in particular, of nickel, are underexplored. In this work, the authors studied the influence of the compressive load magnitude on the lap shear strength and the structure of joints of annealed nickel sheets with a thickness of 0.5 mm produced by spot USW. The authors carried out USW at a vibration frequency of 20 kHz with an amplitude of 15 μm, the time of welding was equal to 2 s. The compressive load magnitude was varied from 3.5 to 7 kN. The study showed that with an increase in the compressive load in the considered range of values, the strength of weld joints increased, reached a maximum, and then decreased. The joints obtained at the compressive load of 6 kN demonstrated the highest lap shear strength of 1950 N. A zone of thermomechanical influence with a gradient microstructure is observed near the contact of the welded surfaces. In a layer with a thickness of 10–20 mm, the initial coarse-grained structure of nickel is transformed into an ultra-fine-grained one with a grain size of less than 1 mm. The ultra-fine-grained layer neighbors on crystallites, the size of which is several micrometers and increases with a distance from the contact surface of welded sheets. The authors compared the results of mechanical lap shear tests and structural studies with the data obtained after ultrasonic welding of nickel, aluminum, and copper alloys.

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“…In order to develop the advanced Ti alloys integrated the damage tolerance and high strength properties, a great amount of efforts have been completed investigating the high-strain rate shear behaviours of α Ti (Shahan and Taheri, 1993;Meyers et al, 1994;Chichili et al, 1998;Yang and Wang, 2006;Wang et al, 2007;Yang et al, 2010;Jiang et al, 2015;Kuang et al, 2017), Ti-6Al-4V alloy (Me-Bar andShechtman, 1983;Grebe et al, 1985;Da Silva and Ramesh, 1997;Lee and Lin, 1998;Timothy and Hutchings, 2013;Sun et al, 2014a;b;Mendoza et al, 2015;Zhou et al, 2017), TC16 (Wang, 2008), near-β Ti5551 (Ran and Chen, 2018) and Ti5553 (Yan and Jin, 2020), β ones (Zhan et al, 2016), α + β dual-phase ones (Yang et al, 2011b;Mantri et al, 2018;Ben Boubaker et al, 2019;Danard et al, 2019;Kloenne et al, 2020;Lee et al, 2020), and so on. It is worth mentioning that the dual-phase materials (Wu et al, 2017;Hao et al, 2021;Zou et al, 2021) always present ultra-strong and ductile behaviors combining the solid solution strengthening, grain refinement effect, and precipitation hardening, which could excellently deal with the planar-defects-dominated plastic deformation behaviors (Hao et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

Effect of High Strain Rates on Adiabatic Shear Bands Evolution and Mechanical Performance of Dual-Phase Ti Alloy

Fang

Wang

et al. 2022

Front. Mater.

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In the present work, the adiabatic shear characteristics of our recently designed α + β dual-phase Ti alloy at different strain rates have been investigated by hat shaped specimen. The deformation process is divided into three stages: work hardening stage, steady stage, and unstable thermal softening stage. Along or near the shear deformation paths, the microvoids and the cracks can be captured at the strain rate of 1.8 × 104 s−1, 2.0 × 104 s−1, and 2.3 × 104 s−1, both of which contribute to the stable and unstable softening. It is found that dynamic stored energy of cold work will be significantly improved by the enhanced high strain rate. In the view of coupling analysis of inverse pole figure and grain boundary map, it seems that low angle grain boundaries present a good resistance to the formation of cracks and thermal softening. On the contrary, high angles grain boundaries are typically located in ASBs and their affecting regions, which is in line with the reported results. While the geometrical necessary dislocation (GND) density of adiabatic shear band (ASB) and its surroundings increased significantly, the width of the ASB becomes wider as the strain rate increases, which is consistent with the theory of sub-grain rotation dynamic recrystallization model. The formation of multiple ASBs in the corner position is schematically illustrated and the average elastic modulus and hardness of the ASB region are lower than the α and β phases, combined with the GND analysis, which proves that the ASB is a thermal softening zone in this experiment.

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Adiabatic shear localization in pure titanium deformed by dynamic loading: Microstructure and microtexture characteristic

Cited by 34 publications

References 25 publications

Nanoindentation and Microstructure in the Shear Band in a Near Beta Titanium Alloy Ti-5Al-5Mo-5V-1Cr-1Fe

Nanoindentation and Microstructure in the Shear Band in a Near Beta Titanium Alloy Ti-5Al-5Mo-5V-1Cr-1Fe

Microstructure and strength of joints of nickel sheets produced by ultrasonic welding

Effect of High Strain Rates on Adiabatic Shear Bands Evolution and Mechanical Performance of Dual-Phase Ti Alloy

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