Strain Rate Dependence of Tensile Properties of Extruded Mg–9Y–3Zn–1Mn Alloy

Zhang, Xiaoru; Wang, Zehui; Jiang, Yue; Sun, Guixun; Jiang, Zhonghao; Che, Chaojie; Bi, Guangli; Liu, Jiaan; Wang, Wenquan; Fang, Daqing

doi:10.1002/adem.201800123

Cited by 4 publications

(4 citation statements)

References 48 publications

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“…5,6) The increase in strength and the reduction in ductility with the increasing strain rate is typical in tension and frequently observed in various metallic materials with normal-size grained structures. 20,21) Therefore, the GBS poses negligible influence on the mechanical properties of AZ80Mg alloy MDFed at room temperature owing to the impediment of the GBS by the acicular microstructures, i.e., edge-shaped ultrafine grains. Extremely work-hardened grains might prevent plastic accommodation that is required for extensive GBS.…”

Section: Mechanical Propertiesmentioning

confidence: 99%

Basic Research on Multi-Directional Forging of AZ80Mg Alloy for Fabrication of Bulky Mechanical Components

Miura

Nakamura²,

Watanabe

2023

Mater. Trans.

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In this study, a commercial hot-extruded AZ80Mg alloy was multi-directionally forged (MDFed) at room temperature by employing pass strains of ¦¾ = 0.1. The effects of the combined processes of MDFing and ageing on the microstructural evolution and strengthening were precisely examined in advance. The coarse initial grains were gradually subdivided into ultrafine grains by multiple mechanical twinning and kinking. As observed, the multiple twinning effectively suppressed the evolution of the sharp basal texture and enabled MDFing at room temperature to high cumulative strains. Although the combined processes of MDFing and ageing tended to increase the hardness and yield stress compared to those fabricated using simple MDFing at lower cumulative strain regions, the mechanical properties were almost comparable and independent of the processes at regions of higher cumulative strain beyond ¦¾ = 2.0. Yield strength over 505 MPa, ultimate tensile strength of over 612 MPa and ductility of over 7% were constantly achieved in all the processes. Although certain selected processes were applied to bulk samples for fabricating the mechanical components, frequent cracking hindered the MDFing to high cumulative strain regions. This finding signified that adequate MDFing process is dependent on sample size. However, MDFing with smaller pass strains than ¦¾ = 0.1 enabled MDFing to regions of high cumulative strain. Thus, bulk AZ80Mg alloy with well-balanced mechanical properties®yield strength of 420 MPa, ultimate tensile strength of 540 MPa, and ductility of 10%®could be successfully fabricated.

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Section: Mechanical Propertiesmentioning

confidence: 99%

Basic Research on Multi-Directional Forging of AZ80Mg Alloy for Fabrication of Bulky Mechanical Components

Miura

Nakamura²,

Watanabe

2023

Mater. Trans.

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“…During slip-dominated deformation processes such as in-plane tension, these alloys exhibit to have high strain rate sensitivity. Zhang et al [10] demonstrated that strain rate has a profound effect on the tensile behavior of Mg-9Y-3Zn-1Mn alloy. Their study also revealed that the strain rate effect was more pronounced on the ductility of the alloy as compared to its strength.…”

Section: Introductionmentioning

confidence: 99%

Strain Rate Dependent Mechanical Behavior of Nanostructured Mg- 3%al Alloys

Mallick,

Deka,

Sharma

et al. 2023

Materials, Methods & Technologies

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This work focused on the strain rate-dependent mechanical behavior of Mg-3%Al alloy fabricated via powder metallurgy. The effects of ball milling for different durations are also discussed in this study. Powder metallurgy approach integrating sintering at inert atmosphere followed by hot extrusion was used to fabricate Mg-3%Al alloys. Microstructural analysis and X-ray diffraction (XRD) studies demonstrated that the alloy of the solid solution of Mg and 3%Al were successfully fabricated using the powder metallurgy route. Both the milled powder and their extruded bulk samples revealed evidence of the formation of second-phase particles. Tensile tests were carried out at different strain rates, and the yield strength, tensile strength, and elongation to failure of samples made from milled and un-milled powders were measured and compared. The findings demonstrated that the strain rate and the grain sizes of the extruded samples have a significant impact on the strength and ductility of the bulk samples. The possible deformation mechanisms for each sample are discussed. It is hypothesized that the grain boundary movement mechanism and the geometrically necessary dislocations primarily governs the deformation process. The possible fracture mechanisms were predicted from the microstructural study of the fracture behaviors of the deformed samples. The micro-mechanical properties of each sample were analyzed using the loading-unloading curves of the micro-indentation test.

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“…However, due to the poor absolute strength and ductility, the widespread application for Mg alloys is severely restricted . Mg–Zn–Y alloys containing long‐period stacking‐ordered (LPSO) structure have shown promising application prospects owing to distinctive microstructure and outstanding performance …”

Section: Introductionmentioning

confidence: 99%

Enhanced Performance of Mg–Zn–Y–Mn Alloy via Minor Ca Addition

et al. 2019

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Herein, the effect of calcium (Ca) microalloying on the microstructure and mechanical properties of Mg94Zn2.5Y2.5Mn1 alloy is identified. The long‐period stacking‐ordered (LPSO) phase transformation mechanism during solid‐solution treatment and hot deformation behavior during extrusion process are analyzed. The role of minor (0.34 at%) Ca addition in the as‐cast alloy is related to the fine microstructure and abundant 18R‐LPSO phase. Furthermore, the precipitation of 14H‐LPSO phase is greatly induced by Ca addition in subsequent solid‐solution treatment. As for as‐extruded alloys, the dynamic precipitation behavior of W phase nanoparticles is found. The high‐density W phase nanoparticles suppress the dynamic recrystallization (DRX) behavior and inhibit the growth of dynamical recrystallized (DRXed) grains. The as‐extruded Ca‐modified alloy shows a superior mechanical property with yield strength (YS), ultimate tensile strength (UTS), and elongation of 400, 434 MPa, and 19.5%, respectively. The tiny microstructure, W phase nanoparticles, and kinky LPSO (both 18R and 14H type) phase are the reasons for the outstanding mechanical properties.

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Strain Rate Dependence of Tensile Properties of Extruded Mg–9Y–3Zn–1Mn Alloy

Cited by 4 publications

References 48 publications

Basic Research on Multi-Directional Forging of AZ80Mg Alloy for Fabrication of Bulky Mechanical Components

Basic Research on Multi-Directional Forging of AZ80Mg Alloy for Fabrication of Bulky Mechanical Components

Strain Rate Dependent Mechanical Behavior of Nanostructured Mg- 3%al Alloys

Enhanced Performance of Mg–Zn–Y–Mn Alloy via Minor Ca Addition

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