Exceptional texture evolution induced by multi-pass cold drawing of magnesium alloy

Lei, Sun; Bai, Jing; Xue, Feng; Li, Tao; Chu, Chenglin; Meng, Jiao

doi:10.1016/j.matdes.2017.09.027

Cited by 43 publications

(23 citation statements)

References 30 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 strength and hardness of nearly all alloys generally increase by cold drawing. For example, hardness of cold-drawn metalsis improved up to ~60% for Mg-2Zn [ 7 ], ~54% for AZ31 [ 8 ] and also for a range of other metals strong hardening has been evidenced [ 9 , 10 ]. Some studies suggested that the hardening behavior is mainly due to the strain-induced accumulation of dislocations and/or twins [ 11 , 12 ].…”

Section: Introductionmentioning

confidence: 99%

“…According to the Taylor’s model, twins and/or non-basal slips may be activated [ 18 ]. This may affect the texture of Mg, which has an important influence on the hardness of Mg during cold deformation [ 7 , 19 ]. So far, the effects of microstructure and texture on work softening behaviors of pure Mg wires by cold drawing are rarely reported [ 20 ].…”

Section: Introductionmentioning

confidence: 99%

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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%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The Work Softening Behavior of Pure Mg Wire during Cold Drawing

et al. 2018

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“…Moreover, all of the misorientation angle distributions give priority to high angle boundaries with a weak peak~30 • . This corresponds to the position of 1011 − 1120 double twins in Mg [17]. Both of the ratios of low angle (<10 • ) distribution of grains and the peak~30 • were relatively high in the specimen annealed at 200 • C/5 min, as seen Figure 8a.…”

Section: Texturementioning

confidence: 77%

“…Another reasonable explanation is that the recrystallization texture formed during annealing should not be ignored. It is reported that texture plays an important role in the mechanical properties of Mg [17,18]. Based on the study on the microstructure and mechanical properties during annealing, the texture evolution of Mg wires at different recrystallization stages was investigated.…”

Section: Texturementioning

confidence: 99%

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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Influence of Thermal Processing on Resoloy Wire Microstructure and Properties

Xue

Griebel²,

Zhang

et al. 2021

Adv Eng Mater

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Metallic wires are critical components for various clinical applications, including orthopedic fixation, surgical staples, K-wires, and guide wires. They can also be knitted or woven to fabricate cardiovascular stents and bone scaffolds. [1][2][3] Conventionally, such devices are made by metals such as stainless steel (SS), titanium (Ti) alloys, and cobalt-chromium (CoCr) alloys because of their excellent corrosion resistance and superior mechanical properties compared to local biological tissues. [4] However, the nondegradability of these alloys can require a secondary surgery, and their high stiffness may enable stress shielding. [5,6] In contrast, polylactic acid (PLA), poly(lactide-co-glycolide) (PLGA), and polycaprolactone (PCL) possess biodegradability, which can avoid the need for a second surgery. However, the acidic nature of their corrosion byproducts can lower the local pH of the tissue microenvironment, resulting in elevated inflammatory responses. [7,8] Furthermore, they possess weak mechanical properties, which limit their use in load-bearing applications. [9,10] Magnesium (Mg) and its alloys offer a third type of material that possesses multiple promising properties. First, Mg is an essential element for human metabolism, and it has shown sufficient biocompatibility. [11,12] Second, Mg alloys have elastic moduli (40-45 GPa) and yield strengths (100-600 MPa) closer to those of natural bone (5-23 GPa, 35-283 MPa) than common, inert metallic implants, [13,14] effectively reducing stress concentrations around host tissue as well as stress shielding. [15] More importantly, Mg can degrade in the human body in a safe and controlled manner, thereby reducing the need for second surgeries to remove implants. [14,16,17] Currently, successful clinical trials of Mg-based alloys have been reported for orthopedic applications in Germany, [18] China, [19] and South Korea. [20] Conventional, cold-worked (CW) techniques are considered the most promising methods to fabricate fine Mg wires (diameter <1 mm), given their low cost and efficiency. [21] However, these processes are challenging for magnesium-based materials due to their hexagonal close-packed (HCP) crystal structure that has limited slip systems at room temperature. [22][23][24][25][26][27] In some cases, alloying can increase room-temperature ductility. Fine wires made from an Mg-aluminum (Al) alloy have been widely reported, [28][29][30][31][32][33][34] but accumulations of Al in the body are a concern as they can cause neurological disorders such as Alzheimer's disease and dementia. [35] Other elements, such as zinc (Zn), [36,37] silver (Ag), [38] and calcium (Ca), [39,40] have also been included in Mg alloys. For example, M. Zheng et al. [41] first reported

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Exceptional texture evolution induced by multi-pass cold drawing of magnesium alloy

Cited by 43 publications

References 30 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

Influence of Thermal Processing on Resoloy Wire Microstructure and Properties

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