Effects of Sn addition on the microstructure and mechanical properties of extruded Mg–Bi binary alloy

Jin, Sang-Cheol; Lee, Jong Un; Go, Jongbin; Yu, Hui; Park, Sung Hyuk

doi:10.1016/j.jma.2021.04.015

Cited by 23 publications

(7 citation statements)

References 38 publications

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“…It is reported that, when 3-8% Bi is added to pure Mg, the TYS of the extruded samples can be increased by 88 MPa to 129 MPa, mainly because of the grain refinement and precipitation strengthening by fine Mg 3 Bi 2 2 of 7 phases [11,12]. Additionally, Al, Zn, Sn, Ca, and Mn have been introduced into Mg-Bibased alloys to improve their mechanical properties [13][14][15][16][17][18][19][20]. For example, by alloying an Mg-Bi-based alloy with Al and Zn, an extruded Mg-8Bi-1Al-1Zn (BAZ811) alloy exhibiting a TYS of 291 MPa and an elongation of 14.6% was fabricated in our former research [13].…”

Section: Introductionmentioning

confidence: 99%

“…More recently, alloying Mg-Bi alloys with Sn was also used to further increase their mechanical properties. An as-extruded Mg-5Bi-6Sn alloy having typical basic fiber texture and partial dynamic recrystallization (DRX) microstructure exhibits a TYS of 264 MPa [14]. Furthermore, researchers have found that the addition of Ca will also significantly affect the microstructure and properties of the Mg-Bi-based alloys.…”

Section: Introductionmentioning

confidence: 99%

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A Superior High-Strength Dilute Mg-Bi-Ca Extrusion Alloy with a Bimodal Microstructure

Meng

Zhang

Xiao

et al. 2022

Metals

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Improving the mechanical properties of Mg alloys is of great significance for their wide application. A micro-alloyed Mg-1.45Bi-0.79Ca alloy (in wt.%) exhibiting a high tensile yield strength of 394 ± 5 MPa and a moderate elongation of 6.6 ± 0.6% was fabricated by single pass extrusion. The superior high strength is mainly attributed to the synergy effects of ultra-fine dynamic recrystallized grains; numerous Mg2Ca, Mg3Bi2, and Mg2Bi2Ca nano-precipitates; residual dislocations; sub-grain boundaries; as well as strong <10-10> fibre texture in the extrusion direction.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A Superior High-Strength Dilute Mg-Bi-Ca Extrusion Alloy with a Bimodal Microstructure

Meng

Zhang

Xiao

et al. 2022

Metals

View full text Add to dashboard Cite

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“…The addition of Al and Sn improves the ductility in powder metallurgy parts [31,36]. The literature review confirmed that the appropriate control of microstructure with alloy selection and processing methods resulted in better properties, i.e., hardness [7], strength [27,43], wear resistance [38], and corrosion resistance [30], in Mg and its alloys. In addition, the formability [28] and machinability [44,45] of magnesium components are also influenced by the microstructure.…”

Section: Introductionmentioning

confidence: 67%

“…To date, X-ray analysis, optical, and scanning electron microscopy are the three most popular techniques applied by industrial and research practitioners to analyse microstructures [46][47][48]. In Mg alloys, the grain size in microstructures greatly influences mechanical and other tribological properties [27,33]. Examining the grain sizes in microstructures is of primary importance.…”

Section: Introductionmentioning

confidence: 99%

Image Processing of Mg-Al-Sn Alloy Microstructures for Determining Phase Ratios and Grain Size and Correction with Manual Measurement

et al. 2021

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The study of microstructures for the accurate control of material properties is of industrial relevance. Identification and characterization of microstructural properties by manual measurement are often slow, labour intensive, and have a lack of repeatability. In the present work, the intermetallic phase ratio and grain size in the microstructure of known Mg-Sn-Al alloys were measured by computer vision (CV) technology. New Mg (Magnesium) alloys with different alloying element contents were selected as the work materials. Mg alloys (Mg-Al-Sn) were produced using the hot-pressing powder metallurgy technique. The alloys were sintered at 620 °C under 50 MPa pressure in an argon gas atmosphere. Scanning electron microscopy (SEM) images were taken for all the fabricated alloys (three alloys: Mg-7Al-5Sn, Mg-8Al-5Sn, Mg-9Al-5Sn). From the SEM images, the grain size was counted manually and automatically with the application of CV technology. The obtained results were evaluated by correcting automated grain counting procedures with manual measurements. The accuracy of the automated counting technique for determining the grain count exceeded 92% compared to the manual counting procedure. In addition, ASTM (American Society for Testing and Materials) grain sizes were accurately calculated (approximately 99% accuracy) according to the determined grain counts in the SEM images. Hence, a successful approach was proposed by calculating the ASTM grain sizes of each alloy with respect to manual and automated counting methods. The intermetallic phases (Mg17Al12 and Mg2Sn) were also detected by theoretical calculations and automated measurements. The accuracy of automated measurements for Mg17Al12 and Mg2Sn intermetallic phases were over 95% and 97%, respectively. The proposed automatic image processing technique can be used as a tool to track and analyse the grain and intermetallic phases of the microstructure of other alloys such as AZ31 and AZ91 magnesium alloys, aluminium, titanium, and Co alloys.

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“…H. Somekawa et al [9] reported that Mg-3Bi alloy can be extruded at the temperature less than 210 • C and demonstrates an EL of 170%. Additionally, Ca [10][11][12][13][14], Si [10], Mn [15], Al [16], Zn [16], and Sn [17] have been used as alloying elements to improve the mechanical properties of Mg-Bi based alloys. For example, biomedical Mg-5Bi-1Ca/Si alloys having an EL of over 40% were successfully fabricated by the rapid solidification and extrusion process [10].…”

Section: Introductionmentioning

confidence: 99%

A New Extruded Mg-6Bi-3Al-1Zn Alloy with Excellent Tensile Properties

Meng

Xiao

Luo

et al. 2022

Metals

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Aiming to develop low-cost Mg alloys with good mechanical properties, a new Mg-6Bi-3Al-1Zn (wt.%, BAZ631) alloy having a high ultimate tensile strength of ~402 MPa and an elongation of ~15% was fabricated by single pass extrusion. The as-extruded BAZ631 alloy demonstrates an almost fully dynamic recrystallized microstructure with an average grain size of ~2.9 μm. Moreover, both nano-scale Mg3Bi2 and Mg17Al12 precipitates were found dispersed in the matrix. These excellent mechanical properties are attributed to the combined effects of grain boundary strengthening, dispersion and precipitation strengthening induced by both micro and nanoscale second phase particles, and solid-solution strengthening. This high strength and good ductile Mg-Bi based alloy without rare-earth elements addition is expected to inspire a new alloy design strategy for fabricating high performance Mg products for larger-scale industrial applications.

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Effects of Sn addition on the microstructure and mechanical properties of extruded Mg–Bi binary alloy

Cited by 23 publications

References 38 publications

A Superior High-Strength Dilute Mg-Bi-Ca Extrusion Alloy with a Bimodal Microstructure

A Superior High-Strength Dilute Mg-Bi-Ca Extrusion Alloy with a Bimodal Microstructure

Image Processing of Mg-Al-Sn Alloy Microstructures for Determining Phase Ratios and Grain Size and Correction with Manual Measurement

A New Extruded Mg-6Bi-3Al-1Zn Alloy with Excellent Tensile Properties

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