Design of novel Zn-Ag-Zr alloy with enhanced strength as a potential biodegradable implant material

Wątroba, Maria; Bednarczyk, Wiktor; Kawałko, Jakub; Mech, Krzysztof; Marciszko, Marianna; Boelter, Gabriela; Banzhaf, Manuel; Bała, P.

doi:10.1016/j.matdes.2019.108154

Cited by 70 publications

(41 citation statements)

References 45 publications

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“…To date, several research works have suggested the mechanical properties enhancement of Zn alloys through grain refinement down to the ultrafine regime (below ~1 µm) [49,50]. This statement is correct for other metallic bioresorbable metals such as Mg [8,51] and Fe-based [52] alloys.…”

Section: Microstructural and Mechanical Characterizations Of The Wiresmentioning

confidence: 96%

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: 96%

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

et al. 2020

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“…[11] Therefore, it is often supported by methods of conventional plastic deformation, in particular hot rolling or hot extrusion. [12,13] A combination of these two methods yielded further improvement in strength, but failed to deliver simultaneous enhancement of all mechanical properties above a rigorous limit. Another solution lies in the use of unconventional methods of plastic deformation.…”

Section: Introductionmentioning

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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“…Zinc alloys are promising biodegradable structural materials [1,2], and recent research has focused on the manufacturing, processing and characterization of new Zn-based alloys. Zinc alloys are generally processed using conventional hot rolling or extrusion sometimes followed by cold rolling [3][4][5][6] and the application of severe plastic deformation (SPD) processing methods has received less attention. Recently, equal channel angular pressing (ECAP) and hydrostatic extrusion have been used to produce high-alloyed highstrength Zn-based alloys [7,8] while for low-alloyed Zn-alloys the same processing methods decrease the strength and may activate room-temperature (RT) superplasticity [9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Microstructure and mechanical properties of a Zn-0.5Cu alloy processed by high-pressure torsion

Bednarczyk

Kawałko

Wątroba

et al. 2020

Materials Science and Engineering: A

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Design of novel Zn-Ag-Zr alloy with enhanced strength as a potential biodegradable implant material

Cited by 70 publications

References 45 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

Microstructure and mechanical properties of a Zn-0.5Cu alloy processed by high-pressure torsion

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