Rate and temperature dependent deformation behavior of as-cast WE43 magnesium-rare earth alloy manufactured by direct-chill casting

Jahedi, Mohammad; McWilliams, Brandon; Kellogg, Frank B.; Beyerlein, Irene J.; Knežević, Marko

doi:10.1016/j.msea.2017.11.092

Cited by 47 publications

(10 citation statements)

References 82 publications

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“…This is further verified by the boundary map, in which the low angle grain boundaries (LAGBs, 2 • ≤ θ ≤ 15 • ) indicate in green color and high angle grain boundaries (LAGBs, θ ≥ 15 • ) in black color that only a few LAGBs are introduced by the specimen preparation ( Figure 4b). The as-cast (AC) WE43 alloy microstructure is consistent with the previous reports [15,27]. As to the as-extruded Ex-1 alloy with a partially DRX, a moderate <011 0>//ED fiber texture with a very weak rare earth (RE) texture is revealed from the IPF ( Figure 5c) and (0001) PF ( Figure 5d).…”

Section: Starting Microstructuressupporting

confidence: 88%

“…There are studies, especially those published recently, dedicated to the mechanical processing of the WE43 alloy, such as extrusion, rolling, and forging [5][6][7][8][9][10][11][12]. As with most conventional Mg alloys, the WE43 alloy has poor workability at room temperature due to its hexagonal close packed (HCP) lattice structure and has to be processed at elevated temperatures to increase the workability [13][14][15][16]. The term of "workability" refers to the ease with which a material can be shaped by plastic flow without the onset of fracture.…”

Section: Introductionmentioning

confidence: 99%

“…As to the WE43 alloy, Jahedi et al [15] has studied the processing conditions of an as-cast alloy under compressive deformation. It indicated that the as-cast WE43 alloy exhibited relatively high deformation strains (> 1.0 true strain) without fracturing at elevated temperature of 400 • C with a strain rate of up to 10 s −1 or low temperatures with sufficiently low strain rates (e.g., 275 • C and 0.01 s −1 , 300 • C and 0.…”

Section: Introductionmentioning

confidence: 99%

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Comparative Study of Hot Deformation Behavior and Microstructure Evolution of As-Cast and Extruded WE43 Magnesium Alloy

Kang

Huang

Zhao

et al. 2020

Metals

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Under compressive testing at 400 °C and a strain rate range of 0.05–5 s−1, the hot deformation behavior and microstructure evolution of an as-cast (AC), as-extruded (with a bimodal grain structure (named as Ex-1) or a relatively uniform fine grain structure (Ex-2)) WE43 alloy have been investigated and compared. The results indicate that the AC sample exhibits the highest peak stress, while the Ex-2 sample has the lowest value. Within the AC material, fine grains were firstly formed along the pancake-like deformed grains (as a necklace structure). The necklace structure was also formed within the Ex-1 and Ex-2 materials at high strain rates of 0.5 and 5 s−1. However, a lamellar structure that the coarse elongated grains divided by parallel boundaries was formed within the Ex-1 material. A relatively more homogeneous fine grain structure is achieved after a true strain of 1.0 within the Ex-2 material at a low strain rate of 0.05 s−1. In addition, a discontinuous dynamic recrystallization mechanism by grain boundary bulging is found to occur. After a true strain of 1.2, a (0001) fiber texture, a typical rare earth (RE) texture, and a relatively random texture are formed within the AC, Ex-1, and Ex-2 WE43 alloy material, respectively.

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Section: Starting Microstructuressupporting

confidence: 88%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Comparative Study of Hot Deformation Behavior and Microstructure Evolution of As-Cast and Extruded WE43 Magnesium Alloy

Kang

Huang

Zhao

et al. 2020

Metals

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“…Metals, such as Ta, Nb and ferritic steel, with a body‐centered cubic (BCC) crystal structure, have two or three families, making up 24 or 48 slip systems . Metals with hexagonal close packed (HCP) crystal structure like Mg, Zr, Be, or Ti metals as well as orthorhombic crystal structure like U, possess an even larger suite of slip families and systems . Moreover these low symmetry crystal structure metals deform by multiple variant of twins .…”

Section: Introductionmentioning

confidence: 99%

Multiscale Modeling of Microstructure‐Property Relationships of Polycrystalline Metals during Thermo‐Mechanical Deformation

Knežević

Beyerlein

2018

Adv Eng Mater

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The plastic deformation of polycrystalline metals is primarily carried by the crystallographic glide of dislocations and growth of deformation twins. According to the thermodynamic theory of slip, dislocation motion is thermally activated, while deformation twinning is an athermal process. Dislocations must overcome barriers in order to move, while twins must relax the stored energy while growing. These concepts define the critical activation stresses on a slip or twin crystallographic system and how they evolve with plastic strain. This article reviews recent advances in the development of a model for the critical activation stresses for thermally activated glide and the expansion of deformation twins, its implementation into polycrystal plasticity models, and several applications for predicting the constitutive response of polycrystalline metals. Calculations are performed for a range of polycrystalline metals differing in microstructural complexity and crystal structure. These examples include face-centered cubic AA6022-T4, IN718, Haynes 25, and pure Cu, body-centered cubic Nb, Ta, Ta-10W, and steel DP590, hexagonal close-packed pure Be, pure Zr, pure Ti, AZ31, Mg4Li, and orthorhombic U. Excellent agreement with experimental measurement are demonstrated in terms of texture, stress-strain response, and geometrical changes in the samples during deformation for all these metals.

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“…Dynamic behavior of the alloy has been studied . The effect of twinning and texture evolution on the evolution of strain‐hardening anisotropy and tension versus compression asymmetry of WE43‐T6 and direct chill cast WE43 alloy has been studied in Jahedi et al It was found that the alloy in these conditions develops small anisotropy and asymmetry. Ductile fracture behavior of the alloy has also been studied .…”

Section: Introductionmentioning

confidence: 99%

Low‐cycle fatigue behavior of rolled WE43‐T5 magnesium alloy

Ghorbanpour

McWilliams

Knežević

2019

Fatigue Fract Eng Mat Struct

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This paper describes the main results from an investigation into the strength and low‐cycle fatigue (LCF) behavior of a rolled plate of WE43 Mg alloy in its T5 condition at room temperature. The alloy was found to exhibit small tension/compression yield asymmetry and small anisotropy being stronger in transverse direction (TD) than in rolling direction (RD) along with some anisotropy in strain hardening. The LCF tests were conducted under strain‐controlled conditions with the strain amplitudes ranging from 0.6% to 1.4% without the mean strain component. While the stress amplitudes during the LCF were higher for tests along TD than RD, the LCF life was similar for both directions. As revealed by electron microscopy, the fractured surfaces under tension consisted mainly of microvoid coalescence with some transgranular facets, while those fractured in LCF showed a combination of intergranular fracture and transgranular facets with minor content of microvoid coalescence.

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Rate and temperature dependent deformation behavior of as-cast WE43 magnesium-rare earth alloy manufactured by direct-chill casting

Cited by 47 publications

References 82 publications

Comparative Study of Hot Deformation Behavior and Microstructure Evolution of As-Cast and Extruded WE43 Magnesium Alloy

Comparative Study of Hot Deformation Behavior and Microstructure Evolution of As-Cast and Extruded WE43 Magnesium Alloy

Multiscale Modeling of Microstructure‐Property Relationships of Polycrystalline Metals during Thermo‐Mechanical Deformation

Low‐cycle fatigue behavior of rolled WE43‐T5 magnesium alloy

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