Microstructure, texture evolution, mechanical properties and corrosion behavior of ECAP processed ZK60 magnesium alloy for biodegradable applications

Mostaed, Ehsan; Hashempour, Mazdak; Fabrizi, Alberto; Dellasega, David; Bestetti, Massimiliano; Bonollo, Franco; Vedani, Maurizio

doi:10.1016/j.jmbbm.2014.05.024

Cited by 138 publications

(88 citation statements)

References 45 publications

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“…27,187) It seems that contradicting studies reporting inferior corrosion resistance after SPD of pure magnesium, 116) AZ31, 176,189) (type B) may be attributed to the inhomogeneous microstructures related with dynamic recrystallization. Finally, crystallographic orientation dependency of corrosion is very high in magnesium alloys, 83,[190][191][192][193][194][195][196][197][198] and it seems to have higher impact than grain size. The high atomic coordination of basal plane make the electron working function higher, and has the highest resistance to dissolution.…”

Section: Magnesium and Magnesium Alloysmentioning

confidence: 99%

Corrosion of Ultrafine Grained Materials by Severe Plastic Deformation, an Overview

Miyamoto

2016

Mater. Trans.

121

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Corrosion of ultra ne grain (UFG) materials by severe plastic deformation (SPD) is reviewed in light of the existing literature and microstructural change. Fortunately, by holistic survey of the literature, it seems likely that grain re nement by SPD, while enhancing mechanical properties, does not compromise the overall corrosion resistance, and in many case, improve it in comparison with coarse-grained counterparts, although there are some contradictory results within the same materials and same environment. The degree of impact of UFG formation on corrosion is highest in stainless steels followed by aluminum and magnesium alloys whereas it is relatively marginal in pure copper and titanium. The effect of UFG formation by SPD on corrosion is imparted by not only grain re nement, but also other microstructural change occurring commonly in SPD in general and unique to each speci c SPD method. In this review, an attention is paid speci cally to the former case, and this includes shuf ing or redistribution of chemical inhomogeneity into a ner scale, deformation-induced grain boundaries and high internal stress stemming from these grain boundaries. The literature on stress corrosion cracking (SCC) of UFG materials are de nitely insuf cient to nd the general trends, more studies are waited.

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Section: Magnesium and Magnesium Alloysmentioning

confidence: 99%

Corrosion of Ultrafine Grained Materials by Severe Plastic Deformation, an Overview

Miyamoto

2016

Mater. Trans.

121

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“…First studies of biocompatibility of SPD-processed Mg alloys [242,288] show promising results of their increased potential as enhanced biodegradable materials encouraging further fast development of research in the field. Particularly, ECAP (also with backpressure) processing of the AZ31 Mg alloy has dramatically improved mechanical strength and reduced corrosion rate of the material without any degradation of its biocompatibility.…”

Section: Biocompatibilitymentioning

confidence: 99%

Multifunctional Properties of Bulk Nanostructured Metallic Materials

Sabirov

Enikeev

Murashkin

et al. 2015

Bulk Nanostructured Materials With Multifunctional Properties

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This chapter focuses on multifunctional properties of bulk nanostructured metallic materials and structure-properties relationship therein. The most important structural factors affecting mechanical, physical, and chemical properties of the nanomaterials are discussed, and the strategies to their further improvement are outlined. Special attention is paid to nanostructural design for simultaneous improvement of mutually exclusive properties. Superstrength and Enhanced Mechanical PropertiesAlthough the mechanical and functional properties of all polycrystalline metallic materials are determined by several factors, the grain size of the material generally plays the most significant and often a dominant role. Thus, the strength of different polycrystalline materials is related to the grain size, d, through the Hall-Petch equation which states that the yield stress, σ y , is given bywhere σ o is termed the friction stress and k y the Hall-Petch constant [1,2]. It follows from Eq. 3.1 that the strength increases with a reduction in the grain size and this has led to an ever-increasing interest in fabricating materials with extremely small grain sizes. The fabrication of bulk samples and billets using equal channel angular pressing (ECAP), high pressure torsion (HPT), and other severe plastic deformation (SPD) techniques was a crucial first step in initiating investigations into the properties of bulk nanomaterials because the use of SPD processing permitted, and subsequently fully supported, a series of systematic studies using various nanostructured metallic materials including commercial alloys [3][4][5][6][7][8]

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“…Therefore, minimizing the asymmetry effect is of major importance for a widespread commercial acceptability. Previous studies have demonstrated that this mechanical anisotropy can be modified by several ways such as texture weakening [14,15], grain refinement [14][15][16], association of alloying elements [17] and heat treatment [18]. Among the mentioned approaches and factors, texture and grain size make significant contributions to the mechanical asymmetry, though the individual influences of the grain size and texture on yield asymmetry and also the dominant factor when they are combined, have yet to be clarified.…”

Section: Introductionmentioning

confidence: 99%

“…It is well known that grain refinement, especially in ultra-fine regime obtained by severe plastic deformation (SPD) methods, leads to improved mechanical properties and remarkably enhanced superplasticity through grain boundary-sliding (GBS) [15,16,19,20]. It is also proved that GBS contribution to the total plastic flow increases with decreasing the grain size.…”

Section: Introductionmentioning

confidence: 99%

Grain size and texture dependence on mechanical properties, asymmetric behavior and low temperature superplasticity of ZK60 Mg alloy

Fabrizi

Dellasega

Bonollo

et al. 2015

Materials Characterization

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Microstructure, texture evolution, mechanical properties and corrosion behavior of ECAP processed ZK60 magnesium alloy for biodegradable applications

Cited by 138 publications

References 45 publications

Corrosion of Ultrafine Grained Materials by Severe Plastic Deformation, an Overview

Corrosion of Ultrafine Grained Materials by Severe Plastic Deformation, an Overview

Multifunctional Properties of Bulk Nanostructured Metallic Materials

Grain size and texture dependence on mechanical properties, asymmetric behavior and low temperature superplasticity of ZK60 Mg alloy

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