Evolution of Mg–Zn second phases during ECAP at different processing temperatures and its impact on mechanical properties of Zn-1.6Mg (wt.%) alloys

Liu, Huan; Huang, He; Zhang, Yue; Xu, Yan; Wang, Ce; Sun, Jiapeng; Jiang, Jinghua; Ma, Aibin; Xue, Feng; Bai, Jing

doi:10.1016/j.jallcom.2019.151987

Cited by 53 publications

(20 citation statements)

References 44 publications

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“…It was shown that hard precipitates of second phases or ceramic particles in Mg or Zn alloys could promote the DRX process via the particle stimulated nucleation mechanism [ 19 , 34 ]. Thus, the presence of Ag- and Mg-rich precipitates in the investigated Zn–3Ag-0.5Mg alloy might contribute to DRX and average grain size reduction.…”

Section: Discussionmentioning

confidence: 99%

“…As reported, Zn alloys containing Mg additions exhibit satisfactory mechanical strength due to the presence of a highly strengthening Mg-rich eutectic phase [ 18 , 19 ]. However, the highly-soluble Ag addition can provide both solid-solution strengthening and improvement of mechanical properties by tuning the fraction of Ag-rich phases [ 5 , 20 ].…”

Section: Introductionmentioning

confidence: 95%

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Fine-tuning of mechanical properties in a Zn–Ag–Mg alloy via cold plastic deformation process and post-deformation annealing

Wątroba

Bednarczyk

Kawałko

et al. 2021

Bioactive Materials

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In recent years, Zn-based materials have been extensively investigated as potential candidates for biodegradable implant applications. The introduction of alloying elements providing solid-solution strengthening and second phase strengthening seems crucial to provide a suitable platform for the thermo-mechanical strengthening of Zn alloys. In this study, a systematic investigation of the microstructure, crystallographic texture, phase composition, and mechanical properties of a Zn–3Ag-0.5Mg (wt%) alloy processed through combined hot extrusion (HE) and cold rolling (CR), followed by short-time heat treatment (CR + HT) at 200 °C was conducted. Besides, the influence of different annealing temperatures on the microstructure and mechanical properties was studied. An adequate combination of processing conditions during CR and HT successfully addressed brittleness obtained in the high-strength HE Zn–3Ag-0.5Mg alloy. By controlling the microstructure, the most promising results were obtained in the sample subjected to 50% CR reduction and 5-min annealing, which were: ultimate tensile strength of 432 MPa, yield strength of 385 MPa, total elongation to failure of 34%, and Vickers microhardness of 125 HV0.3. The obtained properties clearly exceed the mechanical benchmarks for biodegradable implant materials. Based on the conducted investigation, brittle multi-phase Zn alloys' mechanical performance can be substantially enhanced to provide sufficient plasticity by grain refinement through cold deformation process, followed by short-time annealing to restore proper strength.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 95%

Fine-tuning of mechanical properties in a Zn–Ag–Mg alloy via cold plastic deformation process and post-deformation annealing

Wątroba

Bednarczyk

Kawałko

et al. 2021

Bioactive Materials

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“…1.1 9 10 À3 361 423 5.2 Liu et al [23] Cold Deformation Processes Hot Extrusion + Cold Drawing Zn-0.02Mg 1 9 10 À3 388 ± 2 455 ± 2 5.4 ± 0.3 Wang et al [24] Hot Extrusion + Cold Drawing Zn-0.08Mg after 0 days 3.3 9 10 À3 250 266 30 Jin et al [25] Zn-0.08Mg after 1 year 3. [26] Cold Rolling Zn-0.5Cu-0.05Mg 2 9 10 À3 241 ± 5 312 ± 2 44± 2 Ardakani et al [27] Hot Rolling + Cold Rolling Zn-4Cu 1 mm/min 327 393 39 Li et al [28] Hot-Warm (100°C ) Rolling…”

Section: Hot Extrusionmentioning

confidence: 99%

“…This is consistent with the results for a Zn-1.6Mg alloy where precipitates of the Zn 2 Mg phase also formed in the larger Zn 11 Mg 2 grains after a hot ECAP process. [23] Precipitation of the e-Zn 3 Ag phase occurred either during HE or in the cooling after processing due to the limited solubility of Ag in Zn at 250°C. It appears that in the sample after CR the phase composition remains the same.…”

Section: A Effect Of Simultaneous Additions Of Silver and Magnesium On The Initial Microstructurementioning

confidence: 99%

A Novel High-Strength Zn-3Ag-0.5Mg Alloy Processed by Hot Extrusion, Cold Rolling, or High-Pressure Torsion

Wątroba

Bednarczyk

Kawałko

et al. 2020

Metall Mater Trans A

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A novel Zn-3Ag-0.5Mg alloy was plastically deformed using 3 processing paths: hot extrusion (HE), HE followed by cold rolling (CR) and high-pressure torsion (HPT). The processed samples consisted of the η-Zn phase, ε-Zn3Ag precipitates within the matrix, and nanometric Zn2Mg precipitates within the Zn11Mg2 phase located at the grain boundaries. Both the η-Zn phase and Mg-rich phases were enriched in Ag. Electron backscattered diffraction was used to examine the effects of grain size and texture on mechanical behavior with tensile tests performed at room temperature (RT) at different strain rates. The coarse-grained (~ 6 µm) samples after HE exhibited high strength with brittleness due to dislocation interaction with dispersed precipitates and, to some extent, with twinning activation. Significant grain refinement and processing at RT gave an increase in elongation to over 50 pct in CR and 120 pct in HPT. Ductile CR samples with an average grain size of ~ 2 µm and favorable rolling deformation texture gave a yield strength of ~ 254 MPa, a tensile strength of ~ 456 MPa, and a reasonable strain rate sensitivity. These values for the CR samples meet the mechanical requirements for biodegradable stents in cardiovascular applications.

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“…6d shows that abundant precipitates were formed in a Zn grain within eutectic regions, which could be dynamically precipitated during multi-pass ECAP due to the combined large strains and high processing temperature. According to our previous study, these precipitates are MgZn metastable phase [41]. However, it should be noticed that these precipitates are barely observed in DRX grains of primary Zn regions (shown in Fig.…”

Section: Microstructure Of As-cast and Ecap Alloysmentioning

confidence: 69%

A High-Strength and Biodegradable Zn–Mg Alloy with Refined Ternary Eutectic Structure Processed by ECAP

Huang

Liu

Wang

et al. 2020

Acta Metall. Sin. (Engl. Lett.)

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In this study, the microstructure, mechanical properties and corrosion behaviors of a Zn-1.6Mg (wt%) alloy during multipass rotary die equal channel angle pressing (RD-ECAP) processing at 150 °C were systematically investigated. The results indicated that a Zn + Mg 2 Zn 11 + MgZn 2 ternary eutectic structure was formed in as-cast Zn-Mg alloy. After ECAP, the primary Zn matrix turned to fine dynamic recrystallization (DRX) grains, and the network-shaped eutectic structure was crushed into fine particles and blended with DRX grains. Owing to the refined microstructure, dispersed eutectic structure and dynamically precipitated precipitates, the 8p-ECAP alloy possessed the optimal mechanical properties with ultimate tensile strength of 474 MPa and elongation of 7%. Moreover, the electrochemical results showed that the ECAP alloys exhibited similar corrosion rates with that of as-cast alloys in simulated body fluid, which suggests that a high-strength Zn-Mg alloy was successfully developed without sacrifice of the corrosion resistance.

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Evolution of Mg–Zn second phases during ECAP at different processing temperatures and its impact on mechanical properties of Zn-1.6Mg (wt.%) alloys

Cited by 53 publications

References 44 publications

Fine-tuning of mechanical properties in a Zn–Ag–Mg alloy via cold plastic deformation process and post-deformation annealing

Fine-tuning of mechanical properties in a Zn–Ag–Mg alloy via cold plastic deformation process and post-deformation annealing

A Novel High-Strength Zn-3Ag-0.5Mg Alloy Processed by Hot Extrusion, Cold Rolling, or High-Pressure Torsion

A High-Strength and Biodegradable Zn–Mg Alloy with Refined Ternary Eutectic Structure Processed by ECAP

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