Achieving room temperature superplasticity in the Zn-0.5Cu alloy processed via equal channel angular pressing

Bednarczyk, Wiktor; Kawałko, Jakub; Wątroba, Maria; Bała, P.

doi:10.1016/j.msea.2018.03.052

Cited by 62 publications

(25 citation statements)

References 47 publications

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“…This suggests that the GBS is not the dominant flow mechanism in the HT A4 alloy and therefore the RTS is strictly governed by deformation induced AgZn3 precipitates. Although the GBS mechanism was ascribed to the improved fracture elongation in UFG Zn alloys in some recent studies [59,60], our findings reveals that the underlying mechanism for this improvement arises from the dynamic precipitation of AgZn3 nanoparticles. This phenomenon occurs only in UFG Zn alloys consisting of markedly refined precipitates, where the density of Zn/precipitate interphase boundaries is considerably high.…”

Section: Microstructural and Mechanical Characterizations Of The Wiresmentioning

confidence: 51%

Towards revealing key factors in mechanical instability of bioabsorbable Zn-based alloys for intended vascular stenting

et al. 2020

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Zn-based alloys are recognized as promising bioabsorbable materials for cardiovascular stents, due to their biocompatibility and favorable degradability as compared to Mg. However, both low strength and intrinsic mechanical instability arising from a strong strain rate sensitivity and strain softening behavior make development of Zn alloys challenging for stent applications. In this study, we developed binary Zn-4.0Ag and ternary Zn-4.0Ag-xMn (where x= 0.2-0.6wt%) alloys. An experimental methodology was designed by cold working followed by a thermal treatment on extruded alloys, through which the effects of the grain size and precipitates could be thoroughly investigated. Microstructural observations revealed a significant grain refinement during wire drawing, leading to an ultrafine-grained (UFG) structure with a size of 700 nm and 200 nm for the Zn-4.0Ag and Zn-4.0Ag-0.6Mn, respectively. Mn showed a powerful grain refining effect, as it promoted the dynamic recrystallization. Furthermore, cold working resulted in dynamic precipitation of AgZn3 particles, distributing throughout the Zn matrix. Such precipitates triggered mechanical degradation through an activation of Zn/AgZn3 boundary sliding, reducing the tensile strength by 74% and 57% for Zn-4.0Ag and Zn-4.0Ag-0.6Mn, respectively. The observed precipitation softening caused a strong strain rate sensitivity in cold drawn alloys. Short-time annealing significantly mitigated the mechanical instability by reducing the AgZn3 fraction. The ternary alloy wire showed superior microstructural stability relative to its Mn-free counterpart due to the pinning effect of Mn-rich particles on the grain boundaries. Eventually, a shift of the corrosion regime from localized to more uniform was observed after the heat treatment, mainly due to the dissolution of AgZn3 precipitates.

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Section: Microstructural and Mechanical Characterizations Of The Wiresmentioning

confidence: 51%

Towards revealing key factors in mechanical instability of bioabsorbable Zn-based alloys for intended vascular stenting

et al. 2020

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“…[31] Such behavior is observed in materials deformed by SPD methods. [14,32,33] Grain refinement and the accompanying increase in the volume of HAGB combined with a high deformation rate positively affects GBS.…”

Section: Discussionmentioning

confidence: 99%

Controlled Grain Refinement of Biodegradable Zn-Mg Alloy: The Effect of Magnesium Alloying and Multi-Pass Hydrostatic Extrusion Preceded by Hot Extrusion

Jarzębska

Bieda

Maj

et al. 2020

Metall Mater Trans A

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To satisfy the most stringent criteria in terms of new cardiovascular stents, pure Zn was alloyed with 1 wt pct of Mg and subsequently subjected to plastic deformation, using conventional hot extrusion followed by multi-pass hydrostatic extrusion. A detailed microstructural and textural characterization of the obtained materials was conducted, and mechanical properties were assessed at each pass of deformation process. In contrast to pure Zn, hydrostatically extruded low-alloyed Zn is characterized by a remarkable increase in strength and ductility (YS = 383 MPa, E = 23 pct), exceeding the values needed for stents. Such behavior is associated with a dual microstructure containing fine-grained Zn, alternatively arranged with bands of a fragmented eutectic. Extensive grain refinement was achieved due to the process of continuous dynamic recrystallization. Hydrostatic extrusion changes the initial $$ \langle 10\bar{1}0\rangle $$ ⟨ 10 1 ¯ 0 ⟩ fiber texture to a 〈0002〉 and $$ \langle 10\bar{1}1\rangle $$ ⟨ 10 1 ¯ 1 ⟩ double fiber texture in which the 〈0002〉 component decreases with each pass of hydrostatic extrusion. The gradual evolution of texture components was simulated using a visco-plastic self-consistent model, which confirmed that, during hydrostatic extrusion, secondary slip systems were activated involving mostly the pyramidal one.

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“… [ 170 ] Zn-0.5Cu Melting at 650 °C for 1 h + Annealing at 450 °C for 4 h + ECAP processing = 22 °C with ER of 0.1 mm/s + ϕ = 90° GR occurred due to four-pass ECAP with an average GS from 560 to 1 μm, leading to an increase in ε by 510%. [ 173 ] Zn–3Mg Melting at 550 °C for 1 h + homogenized at 370 °C for 15 h followed by WQ + ECAP processing = 22 °C with ER of 1 mm/s + ϕ = 120° Two-pass ECAP led to GR decreased from 48 to 1.8 μm, which notable improved the σ UTS and ε from 84 to 220 MPa and 1.3–6.3%, respectively, in addition to a decrease in CR from 0.30 to 0.24 mm/y. [ 160 ] Zn-0.42Mn Melting at 650 °C for 1 h + Annealing at 450 °C for 4 h + ECAP processing = 22 °C with ER of 0.1 mm/s + angle between channels = 90° ECAP caused GR with mean GS decreased from 7.0 to 1.1 μm, resulting in an increase in ε by 108%, but a decrease in σ TYS from 187 to 148 MPa and σ UTS from 251 to 188 MPa, respectively.…”

Section: Fabrication and Post-thermomechanical Processing Of Zn-basedmentioning

confidence: 99%

Recent research and progress of biodegradable zinc alloys and composites for biomedical applications: Biomechanical and biocorrosion perspectives

Kabir

Munir

Wen

et al. 2021

Bioactive Materials

228

143

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Biodegradable metals (BMs) gradually degrade in vivo by releasing corrosion products once exposed to the physiological environment in the body. Complete dissolution of biodegradable implants assists tissue healing, with no implant residues in the surrounding tissues. In recent years, three classes of BMs have been extensively investigated, including magnesium (Mg)-based, iron (Fe)-based, and zinc (Zn)-based BMs. Among these three BMs, Mg-based materials have undergone the most clinical trials. However, Mg-based BMs generally exhibit faster degradation rates, which may not match the healing periods for bone tissue, whereas Fe-based BMs exhibit slower and less complete in vivo degradation. Zn-based BMs are now considered a new class of BMs due to their intermediate degradation rates, which fall between those of Mg-based BMs and Fe-based BMs, thus requiring extensive research to validate their suitability for biomedical applications. In the present study, recent research and development on Zn-based BMs are reviewed in conjunction with discussion of their advantages and limitations in relation to existing BMs. The underlying roles of alloy composition, microstructure, and processing technique on the mechanical and corrosion properties of Zn-based BMs are also discussed.

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Achieving room temperature superplasticity in the Zn-0.5Cu alloy processed via equal channel angular pressing

Cited by 62 publications

References 47 publications

Towards revealing key factors in mechanical instability of bioabsorbable Zn-based alloys for intended vascular stenting

Towards revealing key factors in mechanical instability of bioabsorbable Zn-based alloys for intended vascular stenting

Controlled Grain Refinement of Biodegradable Zn-Mg Alloy: The Effect of Magnesium Alloying and Multi-Pass Hydrostatic Extrusion Preceded by Hot Extrusion

Recent research and progress of biodegradable zinc alloys and composites for biomedical applications: Biomechanical and biocorrosion perspectives

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