Microstructure, tensile properties and corrosion behavior of friction stir processed Mg-9Li-1Zn alloy

Liu, Gang; Ma, Zhenduo; Wei, Guobing; Xu, Tiancai; Zhang, Xi; Yang, Yan; Xie, Weidong; Peng, Xiaodong

doi:10.1016/j.jmatprotec.2018.12.026

Cited by 59 publications

(12 citation statements)

References 19 publications

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“…In addition, note that the EI of the WD sample was also significantly higher than that of the BMs. This result was consistent with that of previous studies [32,33]. Liu et al [32] obtained high-performance Mg-9Li-1Zn alloy by friction stir processing.…”

Section: Anisotropic Tensile Propertiessupporting

confidence: 93%

Microstructure Distribution and Tensile Anisotropy of Dissimilar Friction Stir Welded AM60 and AZ31 Magnesium Alloys

Zhang

Han

Xie

et al. 2020

Acta Metall. Sin. (Engl. Lett.)

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The microstructure distribution, tensile anisotropy and fracture behaviors in the dissimilar friction stir welded joint of AM60/ AZ31 alloys were investigated. Experimental results showed that a significant grain refinement and an orientation fluctuation occurred in the weld. The grain size of AZ31 side in joint was obviously smaller than that of AM60 side. There was a higher percentage of low angle grain boundaries (LAGBs) and a lower degree of recrystallization in AZ31 side compared with those in AM60 side, especially for the thermo-mechanically affected zone in AZ31 side. The discrepancies of grain size distribution, recrystallization behavior and LAGBs in joint depended on the different initial state of two metals and the inhomogeneous temperature distribution in joint. In addition, the (0001) basal plane in weld was roughly parallel to the surface of the pin, showing the symmetrically distributed texture characteristics. The joint showed an obvious tensile anisotropy due to the special texture distribution. The comprehensive tensile properties of joint along the three directions decreased in the order: welding direction, 45° direction and transverse direction. The maximum ultimate tensile strength, yield strength and elongation of the joint were 242 MPa, 116 MPa and 21.2%, respectively. The fluctuations of grain size and texture in joint affected the fracture behavior of samples in the three directions.

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Section: Anisotropic Tensile Propertiessupporting

confidence: 93%

Microstructure Distribution and Tensile Anisotropy of Dissimilar Friction Stir Welded AM60 and AZ31 Magnesium Alloys

Zhang

Han

Xie

et al. 2020

Acta Metall. Sin. (Engl. Lett.)

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“…It is found, based on Figure 13b,c, that the black and white zones are associated with α-Mg phase with the HCP structure and the ꞵ-Li phase with the body centered cubic (BCC) structure, respectively. A small fraction of dislocations have been distributed close to the boundary of the α-Mg phase, as shown in Figure 13a [24]. Based on Figure 13a, it can be stated that the Observations by transmission electron microscopy (TEM) show that a substructure of dislocations can be developed during FSW/FSP [6,27,28].…”

Section: Microstructural Assessmentmentioning

confidence: 88%

“…It can be said that the distribution of Mg 17 Al 12 precipitations is pseudo-networked [3]. TEM image and selected area electron diffraction (SAED) pattern of SZ of the friction stir processed LZ91 alloy are shown in Figure 13 [24]. The LZ91 alloy consists of two phases of α-Mg and β-Li.…”

Section: Microstructural Assessmentmentioning

confidence: 99%

“…These methods consist of equal-channel angular pressing (ECAP), high-pressure torsion (HPT), accumulative roll bonding (ARB), differential speed rolling (DSR), friction stir processing (FSP), etc. [15,24,25]. Among them, FSP is a very efficient and useful method because the tensile strength of the stir zone (SZ) does not drop, and this zone is ductile [15,[25][26][27].…”

Section: Introductionmentioning

confidence: 99%

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Friction Stir Welding/Processing of Mg-Based Alloys: A Critical Review on Advancements and Challenges

et al. 2021

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Friction stir welding (FSW) and friction stir processing (FSP) are two of the most widely used solid-state welding techniques for magnesium (Mg) and magnesium alloys. Mg-based alloys are widely used in the railway, aerospace, nuclear, and marine industries, among others. Their primary advantage is their high strength-to-weight ratio and usefulness as a structural material. Due to their properties, it is difficult to weld using traditional gas- or electric-based processes; however, FSW and FSP work very well for Mg and its alloys. Recently, extensive studies have been carried out on FSW and FSP of Mg-based alloys. This paper reviews the context of future areas and existing constraints for FSW/FSP. In addition, in this review article, in connection with the FSW and FSP of Mg alloys, research advancement; the influencing parameters and their influence on weld characteristics; applications; and evolution related to the microstructure, substructure, texture and phase formations as well as mechanical properties were considered. The mechanisms underlying the joining and grain refinement during FSW/FSP of Mg alloys-based alloys are discussed. Moreover, this review paper can provide valuable and vital information regarding the FSW and FSP of these alloys for different sectors of relevant industries.

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“…Wang et al [35] investigated the optimum swaging/annealing conditions for WE43 alloy and increased both, the strength and ductility of the alloy via swaging and annealing at 400 • C, and Martynenko et al [36,37] optimized the swaging treatment and reported the grains within WE43 alloy to refine down to 0.5 µm and the strength to increase to more than 400 MPa after severe swaging at temperatures between 325 and 400 • C. Several studies reporting the effects of FSP on Mg-based alloys have been published, but they are scarce. Wang et al [38] documented the positive effect of rotational speed of FSP on mechanical properties of the processed Mg-Zn-Y-Zr sample, Kumar et al [39] reported the positive influence of FSP on grain refinement within a laser-produced WE43 sample and characterized the varying strengthening mechanisms, Vargas et al [40] imparted significant grain refinement (grain size of 1.2 µm after single FSP pass and submicron grain size after the second pass) and ductility increase within Mg-Zn-Ca-Zr samples, Liu et al [41] homogenized the grain size and refined the grains down to approx. 2 µm and improved the corrosion resistance of Mg-9Li-1Zn alloy via texture randomisation, and Khan et al [42] increased the ductility of QE22 alloy to almost 25% via imparting nucleation of new grains and texture alteration.…”

Section: Introductionmentioning

confidence: 99%

Texture Evolution in Biocompatible Mg-Y-Re Alloy After Friction Stir Processing

Kunčická

Král

Dvořák

et al. 2019

Metals

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The presented study deals with the investigation of biocompatible WE 43 Mg-based alloy processed via the combination of rotary swaging (RS) and friction stir processing (FSP) at three different rotational speeds of 400 RPM, 800 RPM, and 1200 RPM. The structure observations primarily focused on texture development and characterizations of grain sizes and grain boundaries. The results showed that swaging plus processing at 400 RPM and 1200 RPM lead to substantial recrystallization and grain refinement. The fractions of low angle grain boundaries within the 400 RPM and 1200 RPM samples were approximately 11%, while for the 800 RPM sample exhibiting secondary recrystallization it was about 22%. The grains were also the finest in the 1200 RPM sample (average grain diameter of 1.8 µm). The processed structures exhibited a slight tendency to form the {10-10} <0001> preferential fiber texture (especially the 800 RPM sample). Tensile testing showed the FSP to have positive influence on the ultimate tensile stress, as well as ductility of all the samples; the mechanical properties improved with increasing FSP rate.

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Microstructure, tensile properties and corrosion behavior of friction stir processed Mg-9Li-1Zn alloy

Cited by 59 publications

References 19 publications

Microstructure Distribution and Tensile Anisotropy of Dissimilar Friction Stir Welded AM60 and AZ31 Magnesium Alloys

Microstructure Distribution and Tensile Anisotropy of Dissimilar Friction Stir Welded AM60 and AZ31 Magnesium Alloys

Friction Stir Welding/Processing of Mg-Based Alloys: A Critical Review on Advancements and Challenges

Texture Evolution in Biocompatible Mg-Y-Re Alloy After Friction Stir Processing

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