Critical Assessment 9: Wrought magnesium alloys

Robson, James

doi:10.1179/1743284714y.0000000683

Cited by 41 publications

(26 citation statements)

References 81 publications

(124 reference statements)

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“…5 , for the coarse-grain microstructure that is usually obtained in conventionally processed magnesium and its alloys, plastic deformation occurs predominantly by dislocation slip and twinning inside individual grains. Under such circumstance, texture weakening and/or activation of more intra-granular deformation modes is crucial for better formability 29 , 30 . However, when the grain size is reduced to the vicinity of a micron, inter-granular sliding along grain boundaries, which is accommodated by grain rotation, and dynamic recrystallisation can be activated at room temperature.…”

Section: Discussionmentioning

confidence: 99%

Super-formable pure magnesium at room temperature

Zeng

Nie

Xu³

et al. 2017

Nat Commun

180

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Magnesium, the lightest structural metal, is difficult to form at room temperature due to an insufficient number of deformation modes imposed by its hexagonal structure and a strong texture developed during thermomechanical processes. Although appropriate alloying additions can weaken the texture, formability improvement is limited because alloying additions do not fundamentally alter deformation modes. Here we show that magnesium can become super-formable at room temperature without alloying. Despite possessing a strong texture, magnesium can be cold rolled to a strain at least eight times that possible in conventional processing. The resultant cold-rolled sheet can be further formed without cracking due to grain size reduction to the order of one micron and inter-granular mechanisms becoming dominant, rather than the usual slip and twinning. These findings provide a pathway for developing highly formable products from magnesium and other hexagonal metals that are traditionally difficult to form at room temperature.

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Section: Discussionmentioning

confidence: 99%

Super-formable pure magnesium at room temperature

Zeng

Nie

Xu³

et al. 2017

Nat Commun

180

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“…Magnesium (Mg) alloys are been evaluated for various components in automotive and electronic industries because of a range of desirable properties they exhibit such as light weight . However, properties such as ductility, pronounced anisotropy, and low‐corrosion resistance are major drawbacks of Mg alloys . Varying compositions of Mg alloys can be a way to enhance these properties.…”

Section: Introductionmentioning

confidence: 99%

“…[1][2][3][4] However, properties such as ductility, pronounced anisotropy, and low-corrosion resistance are major drawbacks of Mg alloys. 5,6 Varying compositions of Mg alloys can be a way to enhance these properties. To this end, WE-type Mg alloys are very promising because of their significant age-hardening properties and strength at high temperatures.…”

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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“…As the lightest metallic structural materials, Mg alloys show great potential for applications in aerospace, transportation, and electrical industries. However, the poor corrosion resistance of many Mg alloys in aqueous environments has restricted their applications in many fields [ 1 , 2 ]. In addition, the strength of many Mg alloys is still unsatisfactory compared with their counterpart Al alloys [ 3 ].…”

Section: Introductionmentioning

confidence: 99%

T6 Treatment and Its Effects on Corrosion Properties of an Mg–4Sn–4Zn–2Al Alloy

2018

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The effects of T6 treatment (solid-solution and artificially aging at 200 °C) on the microstructure and corrosion properties of an Mg–4Sn–4Zn–2Al (TZA442) alloy were systematically investigated. The alloy exhibits a double-peak age-hardening behavior, i.e., one is 78 HV after 10 h of aging, and the other is 83 HV after 50 h of aging. The strengthening effect is mainly attributed to the simultaneously and mutually independent precipitation of the dispersively distributed MgZn2 and Mg2Sn precipitates. Solid-solution treatment can significantly decrease the corrosion rate of the TZA442 alloy. The following aging treatment can initially further decrease the corrosion rate in the under-aged state, but can afterward slightly increase it after 50 h of aging. The relationship between the microstructure and corrosion properties is also discussed.

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Critical Assessment 9: Wrought magnesium alloys

Cited by 41 publications

References 81 publications

Super-formable pure magnesium at room temperature

Super-formable pure magnesium at room temperature

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

T6 Treatment and Its Effects on Corrosion Properties of an Mg–4Sn–4Zn–2Al Alloy

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