Effects of Bi addition on solidification behavior of Mg–Al–Zn casting alloys using experiments and CALPHAD calculations

Li, Yongsheng; Tang, Ying; Zhao, Weimin; Zhang, Lijun

doi:10.1007/s10853-020-04492-y

Cited by 7 publications

(5 citation statements)

References 26 publications

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“…By statistical analysis, the as-cast AZ31 alloy had a larger average grain size (~158 μm) than the as-cast AZB313 (~123 μm). This result indicates that adding Bi can refine the grains of as-cast AZ series alloys, which is also consistent with the reports of Moshver et al [ 12 ], Li et al [ 13 ], and Wang et al [ 19 ]. During the solidification process, the addition of Bi can be expected to generate a constitutional undercooling diffusion layer ahead of the solid/liquid interface, impeding the diffusion of Mg atoms and thus reducing the growth rate of α-Mg [ 20 ].…”

Section: Resultssupporting

confidence: 92%

“…Obviously, the optimum amount of added Bi depends on the type of AZ series alloy. In order to optimize the novel Bi-modified AZ series alloys, Moshver et al [ 12 ] and Li et al [ 13 ] analyzed the microstructure and mechanical properties of as-cast Mg-(3~9 wt%) Al-Zn-Bi alloys over a wide Bi composition range, and found that 1 wt% Bi was suitable content to add for grain refinement and improved strength and ductility.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Bi Addition on the Heat Resistance of As-Extruded AZ31 Magnesium Alloy

et al. 2023

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In this work, we investigate the impact of Bi addition on the heat resistance of as-extruded AZ31 alloy during high-temperature annealing and hot compression. Electron backscattered diffraction (EBSD) technique and quasi in situ scanning electron microscopy (SEM) are used to analyze the evolution of microstructures during high-temperature annealing and hot compression, respectively. The test results show that with a prolonged annealing time, the as-extruded AZB313 alloy exhibited a lower grain growth rate, due to the pinning effect of Mg3Bi2 phases distributed at grain boundaries. On the other hand, as the compressive temperature increased, the downtrend of strength is delayed in the as-extruded AZB313 alloy. Thermally stable Mg3Bi2 phases dispersed within the grains act as barriers, hindering the motion of dislocations, which not only provides a more effective precipitation strengthening effect, but also increases the resistance to deformation of grains. Moreover, grain boundary sliding can also be restricted by Mg3Bi2 phases located at grain boundaries. This work provides a new idea for the development of heat-resistant wrought Mg alloys.

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Section: Resultssupporting

confidence: 92%

Section: Introductionmentioning

confidence: 99%

Effect of Bi Addition on the Heat Resistance of As-Extruded AZ31 Magnesium Alloy

et al. 2023

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“…Under the equilibrium solidification path, there were only two reactions with the formation of Al8Mn5 and -Mg phase in both alloys. Normally in gravity casting of magnesium alloys, the solidification is more close to the Scheil mode than the equilibrium solidification path [37].…”

Section: As-solidified Microstructurementioning

confidence: 99%

Eutectic intermetallic formation during solidification of a Mg-Sn-Al-Zn-Mn alloy

Deng

Zeng

Xian

et al. 2022

Materials Characterization

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“…The reason for the rather similar decreasing trend observed in the volume fraction of the β-Mg 17 Al 12 phase should also be sought in the solidification process of the Bi-containing alloys. The results of Li et al [24] on the thermal analysis of the Bi-containing AZ alloys showed that when Bi content is less than 0.5 wt-%, Mg 17 Al 12 was the first phase that formed from the liquid after the solidification of primary α-Mg. Nevertheless, when Bi content was higher than 1 wt-%, after the solidification of primary α-Mg, Mg 3 Bi 2 forms before Mg 17 Al 12 .…”

Section: Resultsmentioning

confidence: 98%

“…The results of Li et al . [24] on the thermal analysis of the Bi-containing AZ alloys showed that when Bi content is less than 0.5 wt-%, Mg 17 Al 12 was the first phase that formed from the liquid after the solidification of primary α-Mg. Nevertheless, when Bi content was higher than 1 wt-%, after the solidification of primary α-Mg, Mg 3 Bi 2 forms before Mg 17 Al 12 .…”

Section: Resultsmentioning

confidence: 99%

Indentation creep behaviour of the magnesium AZ61–0.7Si–xBi cast alloys

Sadeghi

Geranmayeh

2022

Materials Science and Technology

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Creep behaviour of the AZ61–0.7Si–xBi cast magnesium alloys were studied by Vickers indentation testing under constant load of 5 N in the temperature range of 423–523 K. The results indicate that increasing Bi content improved the creep resistance at all test temperatures. This was caused by the higher volume fraction of the thermally stable Mg3Bi2 intermetallic particles, as the principal strengthening cause, which compensated the possible effects of the lower amount of the Mg2Si particles. According to the obtained stress exponents of about 6.7 and activation energies in the range of 84.6–88.1 kJ mol−1, dislocation pipe diffusion was suggested as the dominant creep mechanism.

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Effects of Bi addition on solidification behavior of Mg–Al–Zn casting alloys using experiments and CALPHAD calculations

Cited by 7 publications

References 26 publications

Effect of Bi Addition on the Heat Resistance of As-Extruded AZ31 Magnesium Alloy

Effect of Bi Addition on the Heat Resistance of As-Extruded AZ31 Magnesium Alloy

Eutectic intermetallic formation during solidification of a Mg-Sn-Al-Zn-Mn alloy

Indentation creep behaviour of the magnesium AZ61–0.7Si–xBi cast alloys

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