Effect of textural variation and twinning activity on fracture behavior of friction stir welded AZ31 Mg alloy in bending tests

Liu, Dejia; Xin, Renlong; Zhao, Longzhi; Hu, Yong

doi:10.1016/j.jallcom.2016.09.187

Cited by 29 publications

(19 citation statements)

References 44 publications

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“…It was confirmed by a sharp corner appearing close to the triple junction region for the tensile and compressive samples interrupted at 5% strain [97]. Moreover, the authors recently studied different fracture behaviors of FSW AZ31 Mg alloy during Surface and Base bending tests and found that triple junction region has a significant effect on fracture behavior as it is subjected to tensile state, and the effect is much smaller in compression state [98]. Triple junction region is also observed at the dissimilar joint of ZK60/AZ31 by FSW [83].…”

Section: Triple Junction Regionmentioning

confidence: 79%

Analysis of Weak Zones in Friction Stir Welded Magnesium Alloys from the Viewpoint of Local Texture: A Short Review

Liu

Tang

Shen

et al. 2018

Metals

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Friction stir welding (FSW) is a promising approach for the joining of magnesium alloys. Although many Mg alloys have been successfully joined by FSW, it is far from industrial applications due to the texture variation and low mechanical properties. This short review deals with the fundamental understanding of weak zones from the viewpoint of texture analysis in FSW Mg alloys, especially for butt welding. Firstly, a brief review of the microstructure and mechanical properties of FSW Mg alloys is presented. Secondly, microstructure and texture evolutions in weak zones are analyzed and discussed based on electron backscatter diffraction data and Schmid factors. Then, how to change the texture and strengthen the weak zones is also presented. Finally, the review concludes with some future challenges and research directions related to the texture in FSW Mg alloys. The purpose of the paper is to provide a basic understanding on the location of weak zones as well as the weak factors related to texture to improve the mechanical properties and promote the industrial applications of FSW Mg alloys.

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Section: Triple Junction Regionmentioning

confidence: 79%

Analysis of Weak Zones in Friction Stir Welded Magnesium Alloys from the Viewpoint of Local Texture: A Short Review

Liu

Tang

Shen

et al. 2018

Metals

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“…The triple junction region is the junction of CZ, SZ and TMAZ. The drastic texture variant among them used to be investigated in studying the deformation mechanism of FSW Mg alloy [ 20 , 21 ]. The grain orientation tilted gradually roughly from parallel to welding direction (WD) in SZ center to parallel to transverse direction (TD) in SZ side, which forms the texture orientation favorable for extension twinning and basal slip at transverse tension near the SZ side.…”

Section: Introductionmentioning

confidence: 99%

“…Previous studies indicated that these regions of easy to activate the basal slip and extension twinning can play an important role on the fracture, ascribed to the drastic strain localization on the SZ side [ 13 , 17 , 20 ]. In the triple junction region, the texture orientation with the tendency to tilt from CZ side toward SZ side resulted in the inhomogeneous extension twinning behavior and strain localization through the region, which was considered as the fracture factor at transverse tension [ 11 , 21 ]. In addition, it was reported that the compression twinning and double twinning in the middle of bottom side of SZ were responsible for crack nucleation and propagation, due to the strain incompatibility at the twin interface [ 22 , 23 ].…”

Section: Introductionmentioning

confidence: 99%

Microstructure Characteristics and Its Effect on the Fracture in the Triple Junction Region of Friction Stir Welded Mg Alloys Subjected to Tension

2020

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Because of the tensile strength decreasing of the friction stir welded wrought magnesium (Mg) alloy compared to the base material, the reasons for the failure of weld has been focused on. After the fracture in transverse tension, the crack went through the welded joint from the center of the weld to the transition zone between the thermal-mechanical affected zone and weld zone. In the present study, the microstructure characteristics and its effect on the facture in the triple junction region is investigated. Based on the metallography and the electron back-scattered diffraction (EBSD) technology, it was observed that a twin band extended from the triple junction region to the middle of weld. The profuse twinning in the twin band was considered to play an important role on the crack propagation from the stir zone edge to the crown zone.

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“…As the lightest structural materials, magnesium (Mg) and its alloys have broad application prospects in many fields of lightweight industrial applications. [1,2] The limitation of low corrosion resistance significantly restricts the application of Mg alloys. Moreover, many factors have an impact on the corrosion resistance of Mg alloys, including precipitate particles, grain boundaries, dislocation density, and residual stresses.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of corrosion resistance of multipass friction stir processed AZ31 magnesium alloy

Liu

Shen

Tang

et al. 2019

Materials & Corrosion

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Multipass friction stir processing (FSP) is an effective method to produce a homogeneous microstructure and enhance the mechanical properties of magnesium (Mg) alloys. However, few studies have concentrated on the variation of corrosion resistance of Mg alloys during multipass FSP. Electrochemical alternating current (AC) impedance, polarization behavior, hydrogen evolution, and corrosion morphology were used to investigate the effects of subsequent passes on the corrosion resistance of FSP AZ31 plates. A quasi‐in‐situ observation of the growth of corrosion products was carried out to further study the corrosion behaviors of FSP AZ31 alloy. It is found that subsequent passes could further reduce the grain size of FSP AZ31 alloy and result in an increase in the hardness compared with the first pass. Moreover, subsequent passes are beneficial to the improvement in the corrosion resistance of AZ31 alloy. Pitting corrosion occurs in FSP AZ31 plates, which has not changed after subsequent passes.

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Effect of textural variation and twinning activity on fracture behavior of friction stir welded AZ31 Mg alloy in bending tests

Cited by 29 publications

References 44 publications

Analysis of Weak Zones in Friction Stir Welded Magnesium Alloys from the Viewpoint of Local Texture: A Short Review

Analysis of Weak Zones in Friction Stir Welded Magnesium Alloys from the Viewpoint of Local Texture: A Short Review

Microstructure Characteristics and Its Effect on the Fracture in the Triple Junction Region of Friction Stir Welded Mg Alloys Subjected to Tension

Evaluation of corrosion resistance of multipass friction stir processed AZ31 magnesium alloy

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