Critical review of superplastic magnesium alloys with emphasis on tensile elongation behavior and deformation mechanisms

Jeong, Heon; Kim, Woo Jin

doi:10.1016/j.jma.2022.02.009

Cited by 32 publications

(9 citation statements)

References 295 publications

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“…Similar phases have been reported in the literature for extruded ZK60 Mg alloy [20]. Moreover, the SPD did not change the phases of ZK60 Mg alloy, either α-Mg or MgZn 2, as mentioned by Jeong and Kim [21].…”

Section: Xrd and Microstructuresupporting

confidence: 88%

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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Section: Xrd and Microstructuresupporting

confidence: 88%

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 highest elongation of 1390% was reported at 300°C and at a strain rate of 3 × 10 −4 s −1 for a fine-grained ZK60 alloy processed by friction-stir processing [12]. Nevertheless, the coarsening of both grains and the second-phase precipitates in an ultrafine-grained AZ80 Mg alloy reportedly deteriorates the superplastic elongation [11,14]. Although the superplasticity of single-phase ultrafine-grained Mg alloys has been investigated, most of the studies have focused on deformation at very high temperatures, i.e.…”

Section: Introductionmentioning

confidence: 99%

“…The absence of a second phase may lead to dynamic grain growth during superplastic deformation at elevated temperatures. Nevertheless, high-strain-rate superplasticity in a friction-stir-processed AZ31 alloy with an average grain size of 11.4 µm was reported [14,15], wherein a 268% elongation to failure was achieved at 450°C and at a strain rate of 10 −2 s −1 . Moreover, an elongation of ∼460% could be achieved at a relatively low temperature of 150°C in an extrusion-ECAP-treated AZ31 alloy with a mean grain size of 0.7 µm [16].…”

Section: Introductionmentioning

confidence: 99%

Microstructure, texture, and instability during superplastic deformation of ECAP-treated AZ31 Mg alloy

Fatemi-Varzaneh

Paul

Hemmati-Hosuri

2023

Materials Science and Technology

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An ultrafine-grained AZ31 Mg alloy processed through multipass equal channel angular pressing (ECAP) achieved 5 and 0.9 µm mean grain sizes after two and four passes, respectively. The deformation behaviour of the alloy was studied through tensile testing at high temperatures. A 410% superplastic elongation was achieved at 250°C during the tensile deformation of the four-pass-processed alloy. The Haehner criterion allowed the prediction of the stable uniform deformation of the alloy. The strain rate sensitivity of 0.38 and equiaxed microstructure suggested grain boundary sliding as the rate-controlling mechanism. The slip system's contribution to superplasticity was discussed using related Schmid factors. Slip activity prevalence at high strains induced a texture-strengthening effect and allowed low-angle grain boundary formation at high strains.

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“…3 Among the different combinations of Mg alloy, the cast magnesium/aluminum/zinc/manganese (AZ) is a significant choice for automotive industries due to their excellent corrosion resistance, castability, and high strength-to-weight ratio. 4,5 The additions of ceramic particles in Mg alloy increased specific properties. 6 Generally, powder metallurgy, 7 infiltration, 8 stir casting, 9,10 and friction stir processing were referred for magnesium-based matrix composites fabrication.…”

Section: Introductionmentioning

confidence: 99%

SiC actions on characteristics analysis of AZ91D hybrid nanocomposite by liquid state processing

Yesuraj,

Ali,

Venkatesh

et al. 2023

Int J Applied Ceramic Tech

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With an inherent lowest density and distinct solubility with enhanced mechanical behavior reason, the magnesium alloy composite is extensively used in the auto and aero sectors. The processing of magnesium alloy found micro‐cracks and voids between the oxidation spot, which fails properties. Through the sulfur hexafluoride (SF6) atmosphere, the AZ91D alloy hybrid nanocomposites are synthesized with 10 wt% alumina (Al2O3) and 0, 3, 6, and 9 wt% of silicon carbide (SiC) nanoparticles via a liquid state process with 400 rpm stir speed followed by vacuum die casting. The effect of SiC actions on physical behavior, microstructural formation, and mechanical properties of AZ91D/10 wt%Al2O3, AZ91D/10 wt%Al2O3/3 wt% SiC, AZ91D/10 wt% Al2O3/6 wt% SiC, and AZ91D/10 wt% Al2O3/9 wt% SiC composites are studied and its results compared with cast AZ91D alloy. Due to the actions of SiC in AZ91D/10 wt%Al2O3, the composite density conforms to the rule of mixture, and the void and micro‐cracks are limited (less than 1%) by the impact of the casting process, as evidenced in the microstructural illustration. An effect of 10 wt% Al2O3 and 9 wt% SiC contents in AZ91D facilitates maximum tensile strength of 181 MPa, improved elongation percentage of 2.2%, optimum hardness of 85HV, and superior impact toughness of 21.8 J/mm2, which is higher than the all other compositions.

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Critical review of superplastic magnesium alloys with emphasis on tensile elongation behavior and deformation mechanisms

Cited by 32 publications

References 295 publications

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

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

Microstructure, texture, and instability during superplastic deformation of ECAP-treated AZ31 Mg alloy

SiC actions on characteristics analysis of AZ91D hybrid nanocomposite by liquid state processing

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