Microstructural, Mechanical and Corrosion Properties of AZ91 Magnesium Alloy Processed by a Severe Plastic Deformation Method of Hydrostatic Cyclic Expansion Extrusion

Siahsarani, Armin; Samadpour, F.; Mortazavi, Mansour; Faraji, Ghader

doi:10.1007/s12540-020-00828-0

Cited by 24 publications

(6 citation statements)

References 50 publications

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“…Similarly, eutectic dendrites of primary α‐Mg and Mg 17 Al 12 phases were seen in the SEM micrograph (Figure 3B). The similar structures also found in previous studies 49,50 …”

Section: Resultssupporting

confidence: 91%

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Biodegradable AZ91 magnesium alloy/sirolimus/poly D, L‐lactic‐co‐glycolic acid‐based substrate for cardiovascular device application

Mohanta,

Ramdhun,

Thirugnanam

et al. 2023

J Biomed Mater Res

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Biodegradable drug‐eluting stents (DESs) are gaining importance owing to their attractive features, such as complete drug release to the target site. Magnesium (Mg) alloys are promising materials for future biodegradable DESs. However, there are few explorations using biodegradable Mg for cardiovascular stent application. In this present study, sirolimus‐loaded poly D, L‐lactic‐co‐glycolic acid (PLGA)‐coated/ sirolimus‐fixed/AZ91 Mg alloy‐based substrate was developed via a layer‐by‐layer approach for cardiovascular stent application. The AZ91 Mg alloy was prepared through the squeeze casting technique. The casted AZ91 Mg alloy (Mg) was alkali‐treated to provide macroporous networks to hold the sirolimus and PLGA layers. The systematic characterization was investigated via electrochemical, optical, physicochemical, and in‐vitro biological characteristics. The presence of the Mg17Al12 phase in the Mg sample was found in the x‐ray diffraction system (XRD) spectrum which influences the corrosion behavior of the developed substrate. The alkali treatment increases the substrate's hydrophilicity which was confirmed through static contact angle measurement. The anti‐corrosion characteristic of casted‐AZ91 Mg alloy (Mg) was slightly less than the sirolimus‐loaded PLGA‐coated alkali‐treated AZ91 Mg alloy (Mg/Na/S/P) substrate. However, dissolution rates for both substrates were found to be controlled at cell culture conditions. Radiographic densities of AZ91 Mg alloy substrates (Mg, Mg/Na, and Mg/Na/S/P) were measured to be 0.795 ± 0.015, 0.742 ± 0.01, and 0.712 ± 0.017, respectively. The star‐shaped structure of 12% sirolimus/PLGA ensures the bioavailability of the drugs. Sirolimus release kinetic was fitted up to 80% with the “Higuchi model” for Mg samples, whereas Mg/Na/S/P showed 45% fitting with a zero‐order mechanism. The Mg/Na/S/P substrate showed a 70% antithrombotic effect compared to control. Further, alkali treatment enhances the antibacterial characteristic of AZ91 Mg alloy. Also, the alkali‐treated sirolimus‐loaded substrates (Mg/Na/S and Mg/Na/S/P) inhibit the valvular interstitial cell's growth significantly in in‐vitro. Hence, the results imply that sirolimus‐loaded PLGA‐coated AZ91 Mg alloy‐based substrate can be a potential candidate for cardiovascular stent application.

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“…Similarly, eutectic dendrites of primary α‐Mg and Mg 17 Al 12 phases were seen in the SEM micrograph (Figure 3B). The similar structures also found in previous studies 49,50 …”

Section: Resultssupporting

confidence: 91%

“…Similarly, eutectic dendrites of primary α-Mg and Mg 17 Al 12 phases were seen in the SEM micrograph (Figure3B). The similar structures also found in previous studies 49,50. 3.2 | Electrochemical studiesThe variation in the OCP behavior with time in PBS for Mg (AZ91) and Mg/Na/S/P substrate was demonstrated in the Figure4A,B.…”

supporting

confidence: 85%

Biodegradable AZ91 magnesium alloy/sirolimus/poly D, L‐lactic‐co‐glycolic acid‐based substrate for cardiovascular device application

Mohanta,

Ramdhun,

Thirugnanam

et al. 2023

J Biomed Mater Res

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“…Before immersion, trichloroethylene was used to degrease the test specimens. 24 Additionally, the surface of the test specimen was examined using SEM images after conducting immersion test.…”

Section: Methodsmentioning

confidence: 99%

“…For instance, HPT has limitations in producing small parts, and both BP-ECAP and CEC processes require additional components to introduce back pressure into the part. 24 Moreover, the continuous production of specimens using these techniques is hindered by the nature of the processes and the design constraints of their dies.…”

Section: Introductionmentioning

confidence: 99%

Processing of different Mg-based multiphase alloys via a combined severe plastic deformation

Torabi,

Hosseini,

Siahsarani

et al. 2024

Materials Science and Technology

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In this study, cyclic extrusion compression angular pressing-forward extrusion was employed to develop binary magnesium-based multiphase alloys, and subsequently analysed the microstructural, mechanical and corrosional properties of the resulting samples. The findings demonstrate that the inclusion of alloying elements in the multiphase alloys significantly enhances their microstructural, mechanical and corrosional properties. Compared to pure Mg samples fabricated using the same method, the multiphase alloys produced by this technique exhibit finer grain structures. Mechanical analysis indicates that these multiphase alloys possess higher yield and ultimate strength compared to pure magnesium. Corrosion testing reveals that all produced alloys outperform pure magnesium in various aspects. Particularly, Mg–1Zn and Mg–1Mn alloys exhibit exceptional corrosion resistance in immersion, mass loss and polarisation tests.

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“…The CEE process has shown the capability to enhance the characteristics of metal and alloys such as hardness, ultimate tensile strength and ductility by refining the grain size through DRX as the strain accumulates [15]. Therefore, various materials such as 1050 Al alloy [14], AM60 Mg alloy [16], WE43 Mg alloy [17], 6063 Al alloy [18], and AZ91 Mg alloy [19] were processed using CEE, and their characteristics were sought. Unfortunately, little information regarding the effect of CEE processing temperature on the characteristics of samples can be obtained from the studies mentioned above.…”

Section: Introductionmentioning

confidence: 99%

Microstructure and Mechanical Properties of ZK60 Mg Alloy Processed by Cyclic Expansion-Extrusion (CEE) at Different Temperatures

Marheb¹,

Subhi²

2022

ETJ

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The cyclic expansion extrusion (CEE) process was applied to the ZK60 Mg alloy, and the influence of processing temperature was investigated.  The CEE process at a processing temperature of 190 ºC showed significant refining of α-Mg grains to a size of approximately 9 μm.  The mechanical properties of ZK60 Mg alloy were greatly affected by the CEE processing temperature.  The tensile test fracture morphologies of unprocessed and CEEed ZK60 Mg alloy revealed the combination of ductile and brittle fracture mechanisms.In this work, the cyclic expansion extrusion (CEE) process was applied to ZK60 Mg alloy. The correlation between the evolved microstructure and mechanical properties was investigated. The CEE process was performed at a constant ram speed (15 mm/min) and at different processing temperatures (190, 270, and 350 °C). Optical and scanning electron microscopes, X-ray diffraction instruments, Vickers hardness tester, and tensile testing machine were utilized to examine the influence of CEE processing temperature on the characteristics of ZK60 Mg alloy. The XRD analysis showed that two phases were presented in the matrix of ZK60 Mg alloy, namely α-Mg and MgZn 2, in small amounts. The CEE process reduced the size of α-Mg grains due to dynamic recrystallization, especially at the processing temperature of 190 °C. A slight coarsening of the α-Mg grains was observed with increasing processing temperature to 270 and 350 °C. The hardness value of ZK60 Mg alloy was enhanced by about 11 to 19% using the CEE process compared to the as-extruded sample. The processing temperature greatly affected the mechanical properties, where a significant improvement of about 24% yield strength, 9% ultimate tensile strength, and 38% elongation was observed using a processing temperature of 190 °C. The characterization of the tensile fracture surface of the tested samples indicated that the ductile-brittle fracture mode was responsible for the failure.

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Microstructural, Mechanical and Corrosion Properties of AZ91 Magnesium Alloy Processed by a Severe Plastic Deformation Method of Hydrostatic Cyclic Expansion Extrusion

Cited by 24 publications

References 50 publications

Biodegradable AZ91 magnesium alloy/sirolimus/poly D, L‐lactic‐co‐glycolic acid‐based substrate for cardiovascular device application

Biodegradable AZ91 magnesium alloy/sirolimus/poly D, L‐lactic‐co‐glycolic acid‐based substrate for cardiovascular device application

Processing of different Mg-based multiphase alloys via a combined severe plastic deformation

Microstructure and Mechanical Properties of ZK60 Mg Alloy Processed by Cyclic Expansion-Extrusion (CEE) at Different Temperatures

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