Designing Mg alloys with high ductility: Reducing the strength discrepancies between soft deformation modes and hard deformation modes

Liu, Guobao; Zhang, Jing; Xi, Guoqiang; Zuo, Rulin; Liu, Shuang

doi:10.1016/j.actamat.2017.09.006

Cited by 59 publications

(11 citation statements)

References 42 publications

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“…It is expected that Mg alloys with higher ductility and formability can be attained if additional pathways for dislocation motion can be introduced. This can be achieved if the ratio of the CRSS between <c+a> pyramidal and <a> basal slip is reduced and/or cross-slip is facilitated [8][9][10][11]. Moreover, microstructures with weak basal texture present reduced the plastic anisotropy during deformation along different orientations, enhancing formability [12].…”

Section: Introductionmentioning

confidence: 99%

Deformation mechanisms of Mg-Ca-Zn alloys studied by means of micropillar compression tests

Wang

Chen

et al. 2021

Acta Materialia

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Section: Introductionmentioning

confidence: 99%

Deformation mechanisms of Mg-Ca-Zn alloys studied by means of micropillar compression tests

Wang

Chen

et al. 2021

Acta Materialia

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“…23,[25][26][27] Trace additions of rare-earth elements such as yttrium (Y), neodymium (Nd), and cerium (Ce) can improve the strength and ductility of magnesium alloys. The improvement could be attributed to reduced intrinsic stacking fault I1 energy (I1 SFE) 28 to generate <c+a> dislocations, lower critical resolved shear stress (CRSS) of pyramidal <c+a>slip, 29 and more randomized texture. 20 Among the many experimental magnesium sheet alloys reported around the world, the following two were available for evaluation by the USAMP team in collaboration with their university partners.…”

Section: Recent Alloy Developmentmentioning

confidence: 99%

Review: Magnesium Sheet Alloy Development for Room Temperature Forming

Luo

Shi

Miao

et al. 2021

JOM

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Sheet metal forming operations in the automotive industry, including stamping, flanging, bending, hemming and trimming, are dominantly done at room temperature (RT). Unfortunately, the poor RT formability of magnesium due to its hexagonal close-packed structure and generally strong texture has limited the use of these processes in high-volume automotive production. However, the formability of magnesium can be improved via fine grain structure and random texture to enable some RT forming operations. This paper presents the latest magnesium alloy development and evaluation by the United States Automotive Materials Partnership (USAMP) in collaboration with its university partners. A new sheet alloy developed in a recent USAMP project, ZAXME11100 (USAMP Alloy 2 Plus), offers excellent ductility (31% tensile elongation) and RT formability (7.8 mm Erichsen index) in a solutiontreated condition (T4), and a high yield strength (270 MPa) upon post-forming aging treatment (T6), promising RT forming for automotive applications.

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“…through alloying, has to involve the changes created in SFE(γ) and dislocation core properties as demonstrated in the literature (Yasi et al, 2010;Sandlöbes et al, 2011Sandlöbes et al, , 2012Liu et al, 2017;Buey et al, 2018).…”

Section: Concepts Of Stacking Faults and Stacking Fault Energymentioning

confidence: 99%

A Review on Developments in Magnesium Alloys

Kaya

2020

Front. Mater.

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In order to facilitate the understanding of the current research efforts and directions, this article first introduces the anomalous/problematic features of magnesium (Mg) and presents the recent approach of stacking fault energy (SFE)-based alloying element selection to lessen or eliminate this problem. Stacking fault energy computations via ab initio techniques necessitate an understanding of the free electron density distribution around atoms in a solid solution. Therefore, the assessment of the role of atoms by also considering the possibility of short range order (SRO) formation rather than a random solid solution has been revisited. Two possible types of SRO have been indicated. The relevant electronic interactions between the host Mg and the alloying element atoms are more clearly incorporated in a generally less known model by Miedema based on atomic-level thermodynamics rather than in Hume-Rothery rules. This more successful approach has also been addressed here. An evaluation founded on these premises, introducing the relatively more recent Mg alloy systems, has been given in terms of their achievements toward healing the problematic features of Mg alloys. The spectrum of alloy systems discussed ranges from doping of Mg to dilute alloy systems and to some rich alloy systems that offer remarkable properties. Among the first category, an unorthodox addition, doping with oxygen, and its implications, has been presented. The dilute alloy systems and their compositional design based on SRO and SFE together with their potentials have been reviewed. Among the rich alloy compositions, the most interesting precipitate systems, that is, the ones involving order and intermetallic formations, long-period stacking order phases, and quasi-crystals, have been discussed. Among all the alloying elements, one that deserves particular attention, calcium, with its implications such as being economical, offering environmentally friendly Mg metallurgy, and remedial effects on the shortcomings of engineering properties, and a closely related issue of calcium oxide (CaO) addition have been scrutinized. This article also makes an attempt to point out the future directions throughout the text, whenever possible.

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Designing Mg alloys with high ductility: Reducing the strength discrepancies between soft deformation modes and hard deformation modes

Cited by 59 publications

References 42 publications

Deformation mechanisms of Mg-Ca-Zn alloys studied by means of micropillar compression tests

Deformation mechanisms of Mg-Ca-Zn alloys studied by means of micropillar compression tests

Review: Magnesium Sheet Alloy Development for Room Temperature Forming

A Review on Developments in Magnesium Alloys

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