Effect of annealing on the microstructures and properties of cold drawn Mg alloy wires

Lei, Sun; Bai, Jing; Yin, Liping; Gan, Yunhua; Xue, Feng; Chu, Chenglin; Jin, Yan; Wan, Xiaofang; Ding, Hongyan; Zhou, Guanghong

doi:10.1016/j.msea.2015.07.069

Cited by 30 publications

(16 citation statements)

References 23 publications

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“…Being hexagonal close-packed (hcp) in structures with a c/a value of 1.624 and with non-availability of adequate numbers of independent slip systems, Mg alloys intrinsically have relatively low ductility and poor formability at room temperature. Nevertheless, Mg and its alloys exhibit an excellent formability during cold drawing at room temperature [ 5 , 6 , 7 ], achieving a large accumulated strain.…”

Section: Introductionmentioning

confidence: 99%

The Work Softening Behavior of Pure Mg Wire during Cold Drawing

et al. 2018

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We performed multiple-pass cold drawing for pure Mg wire which showed excellent formability (~138% accumulative true strain) at room temperature. Different from the continuous work hardening occurring during cold drawing of Mg alloy wires, for pure Mg, an initially rapid increase in hardness and strength was followed by significant work softening and finally reached a steady-state level, approximately 40~45 HV. The work softening can be attributed to the dynamic recovery and recrystallization of pure Mg at room temperature. Meanwhile, an abrupt change in texture component also was detected with the transition from work hardening to softening in the strain range of 28~34%. During the whole drawing, the strongest texture component gradually transformed from as-extruded basal to <101¯0> fiber (~28% accumulative true strain), and then rapidly returned to the weak basal texture.

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Section: Introductionmentioning

confidence: 99%

The Work Softening Behavior of Pure Mg Wire during Cold Drawing

et al. 2018

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“…However, it is widely recognized that Mg and its alloys, with the hexagonal close-packed crystal structure, exhibit poor ductility and formability at room temperature compared with traditional fcc and bcc metals. With the recent development of research in Mg deformation, thin wires of Mg and its alloys were successfully fabricated by cold-drawing along with the subsequent static recrystallization annealing [8][9][10]. In the whole wire preparation procedure, multi-pass cold drawing and annealing treatment are performed repeatedly and the diameter of the wires gradually decreases.…”

Section: Introductionmentioning

confidence: 99%

“…One purpose of annealing is to optimize the microstructure of severely cold-drawn wires to improve the deformability for the subsequent drawing to prepare fine wire. Another purpose is to modify the microstructure of the final thin wires to obtain preferable integrated mechanical properties [9].…”

Section: Introductionmentioning

confidence: 99%

“…Based on the current application limitations of Mg alloys, most of the findings [11][12][13][14] have been focused on dynamic recrystallization at high temperatures, which is obviously different from the static recrystallization mechanism realized by heat treatment after severe cold deformation. To date, there have been some papers reporting the static recrystallization process of Mg and its alloys after severe cold drawing deformation [9,15,16]. However, the mechanical properties, especially plasticity, which is particularly important for the further cold drawing of thin Mg wires, are rarely reported in the literature.…”

Section: Introductionmentioning

confidence: 99%

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Evolution of Recrystallized Grain and Texture of Cold-Drawn Pure Mg Wire and Their Effect on Mechanical Properties

et al. 2020

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Static recrystallization plays a key role in the fabrication of thin Mg wires as well as the mechanical properties of the final wires. The effect of annealing parameters on the evolution of the microstructures, textures and mechanical properties of cold-drawn pure Mg wire was studied by means of optical microscopy (OM), electron backscatter diffraction (EBSD), a tensile test and a hardness test. This study shows that the mechanical properties of as-annealed pure thin Mg wire is affected not only by the average grain size, but also the uniformity of the recrystallization grains, including the uniformity of grain size and crystal orientation distribution (more random texture component). With increasing annealing temperature and time, the uniformity of recrystallization grain size first improved and then declined after obvious grain growth. At the same time, the randomness of the basal texture component declined with the development of recrystallization. Annealing at 300 °C for 30 min caused the most uniform grain size and orientation distribution in the microstructures, thus contributing to the best plasticity among all experimental wires. It is reasonable to conclude that more uniform and regular recrystallized grains and a more randomly distributed crystal orientation would be benefit for the mechanical properties of Mg wires.

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“…Most promising Mg‐alloys used for cold forming are provided by wires so far based on rare earth (RE) additions: WE43 or ZM21 and Mg‐RE‐Zn . Furthermore, pure Mg has been chosen to process wires .…”

Section: Introductionmentioning

confidence: 99%

Solid solution treatment on strength and corrosion of biodegradable Mg6Ag wires

Maier

Zimmermann

Rinne

et al. 2017

Materials & Corrosion

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A warm‐drawn Mg6Ag wire with a diameter of 1.6 mm is investigated by immersion tests in Ringer solution in two conditions: as‐drawn and solution heat‐treated wire. The initial as‐drawn condition showed higher strength in comparison to the solution heat‐treated one. As‐drawn wire has heavily twinned grains. Heat treatment causes slight grain growth, but less microgalvanic corrosion due to dissolved second phases and a significantly reduction of twin boundaries. The mean corrosion rate decreases by more than half by the heat treatment resulting in higher remaining mechanical properties. The mean corrosion rate also decreases with corrosion time, slightly more for the heat‐treated condition. Pitting corrosion was still present after solution heat treatment, although the pit shape is less harmful. The corroded wires and corrosion products were analysed qualitatively and quantitatively by SEM imaging and ICP‐OES with focus on the exposure time. Mg6Ag wires corrode under forming Mg(OH)2, CaCO3 and AgCl, SEM imaging proves higher corrosion resistance of heat‐treated Mg6Ag. Chemical analysis of wires, corrosion products and corrosion media offer to describe the time‐dependent mechanism.

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Effect of annealing on the microstructures and properties of cold drawn Mg alloy wires

Cited by 30 publications

References 23 publications

The Work Softening Behavior of Pure Mg Wire during Cold Drawing

The Work Softening Behavior of Pure Mg Wire during Cold Drawing

Evolution of Recrystallized Grain and Texture of Cold-Drawn Pure Mg Wire and Their Effect on Mechanical Properties

Solid solution treatment on strength and corrosion of biodegradable Mg6Ag wires

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