Prominent role of a high volume fraction of Mg17Al12 particles on tensile behaviors of rolled Mg–Al–Zn alloys

Zha, Min; Zhang, Hongmin; Wang, Cheng; Wang, Huiyuan; Zhang, En–Bo; Jiang, Qi‐Chuan

doi:10.1016/j.jallcom.2017.08.289

Cited by 64 publications

(18 citation statements)

References 40 publications

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“…For the AT82 alloy, the Mg 17 Al 12 particles do not go through significant coarsening at the strain of~15% and 50% (Figure 7a-d), while when the strain reaches~100%, serious coarsening of second phases occur along grain boundaries, evolving into segregated particles in irregular morphology (Figure 7e,f). This phenomena continues until fracture (Figure 7g,h), which is similar to the reported study on the AZ91 alloy [11]. While for the ATZ811 alloy, the Mg 17 Al 12 particles slightly coarsen at the strain of~50% without obvious coalescence (Figure 8c,d), and even until the fracture, there is only slight coalescence observed (Figure 8e-h).…”

Section: Microstructural Evolution During the Tensile Deformation At supporting

confidence: 87%

“…While for the ATZ811 alloy, the Mg 17 Al 12 particles slightly coarsen at the strain of~50% without obvious coalescence (Figure 8c,d), and even until the fracture, there is only slight coalescence observed (Figure 8e-h). Upon comparing results from different work, the coalescence of Mg 17 Al 12 occurs in the AZ91 [11] and AT82 alloys, but not in the ATZ811 alloy. This suggests that inhibition of the Mg 17 Al 12 coalescence may be due to the cooperative effect of Sn and Zn elements.…”

Section: Microstructural Evolution During the Tensile Deformation At mentioning

confidence: 91%

“…The difference in grain size is because that there are more Mg 2 Sn particles with high thermal stability in AT82 compared with ATZ811. During the hot rolling and inter-pass annealing process, the Mg 17 Al 12 phases precipitate and dissolve repeatedly accompanied by softening and coarsening due to their low thermal stability [11,25], leading to a relatively poor effect on hindering grain growth. However, the presence of fine and homogeneously dispersed Mg 2 Sn precipitates along the grain boundaries can be quite beneficial to obtaining a fine-grain microstructure.…”

Section: Microstructural Characteristics Of As-rolled Materialsmentioning

confidence: 99%

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Superplastic Deformation Behavior of Rolled Mg-8Al-2Sn and Mg-8Al-1Sn-1Zn Alloys at High Temperatures

et al. 2020

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The high-temperature superplastic deformation behavior of rolled Mg-8Al-2Sn (AT82) and Mg-8Al-1Sn-1Zn (ATZ811) alloys were investigated in this study. During tensile deformation at 573 K, no obvious grain growth occurred in both alloys, because of the high-volume fraction of second phases located at grain boundaries. Meanwhile, texture weakening was observed, suggesting that grain boundary sliding (GBS) is the dominant superplastic deformation mechanism, which agreed well with the strain rate sensitivity (m) and the activation energy (Q) calculations. The microstructural evolution during tensile deformation manifested that there were more and larger cavities in AT82 than ATZ811 during high-temperature tensile deformation. Therefore, superior superplasticity was found in the ATZ811 alloy that presented a tensile elongation of ~510% under a strain rate of 10−3 s−1 at 573 K, in contrast to the relatively inferior elongation of ~380% for the AT82 alloy. Meanwhile, good tensile properties at ambient temperature were also obtained in ATZ811 alloy, showing the ultimate tensile strength (UTS) of ~355 MPa, yield strength (YS) of ~250 MPa and elongation of ~18%. Excellent mechanical performance at both ambient and elevated temperatures can be realized by using economical elements and conventional rolling process, which is desirable for the industrial application of Mg alloy sheets.

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Section: Microstructural Evolution During the Tensile Deformation At supporting

confidence: 87%

Section: Microstructural Evolution During the Tensile Deformation At mentioning

confidence: 91%

Section: Microstructural Characteristics Of As-rolled Materialsmentioning

confidence: 99%

See 1 more Smart Citation

Superplastic Deformation Behavior of Rolled Mg-8Al-2Sn and Mg-8Al-1Sn-1Zn Alloys at High Temperatures

et al. 2020

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“…This result indicated that the combined processing route of low-pass ECAP with short-time aging can simultaneously improve both the strength and ductility of the AZ91 alloy. Figure 10c compares the UTS and elongation of the AZ91 ECAP-aged alloys with AZ91 processed by other processing approaches adopted by other studies, including ECAP [8,17,[25][26][27][28][29][30][31][32], accumulative roll bonding [9], differential speed rolling [33,34], rolling [35,36], and multidirectional forging [5]. It is obvious that there was a trade-off between the strength and ductility of the AZ91 alloy processed by conventional deformation or SPD.…”

Section: Microstructure Evolution During Processingmentioning

confidence: 98%

Multimodal Microstructure and Mechanical Properties of AZ91 Mg Alloy Prepared by Equal Channel Angular Pressing plus Aging

Yang

Liu

et al. 2018

Metals

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Developing cost-effective magnesium alloys with high strength and good ductility is a long-standing challenge for lightweight metals. Here we present a multimodal grain structured AZ91 Mg alloy with both high strength and good ductility, prepared through a combined processing route of low-pass ECAP with short-time aging. This multimodal grain structure consisted of coarse grains and fine grains modified by heterogeneous precipitates, which resulted from incomplete dynamic recrystallization. This novel microstructure manifested in both superior high strength (tensile strength of 360 MPa) and good ductility (elongation of 21.2%). The high strength was mainly attributed to the synergistic effect of grain refinement, back-stress strengthening, and precipitation strengthening. The favorable ductility, meanwhile, was ascribed to the grain refinement and multimodal grain structure. We believe that our microstructure control strategy could be applicable to magnesium alloys which exhibit obvious precipitation strengthening potential.

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“…However, their poor creep resistance and inferior corrosion resistance usually limit their application [5,6]. In order to solve the existing problems, many alloying elements (Al, Ca) have been used to improve the mechanical properties and corrosion resistance of Mg-Li alloys [7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Effect of Ca Content on the Mechanical Properties and Corrosion Behaviors of Extruded Mg–7Li–3Al Alloys

Xiong

Yang

Deng

et al. 2019

Metals

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The effect of Ca addition on the microstructure, mechanical properties, and corrosion behaviors of the extruded Mg–7Li–3Al alloys was investigated. The results showed that the extruded Mg–7Li–3Al–xCa alloys consisted of α-Mg (hcp) + β-Li (bcc) matrix phases and Al2Ca. With increasing Ca content, the amount and morphology of the Al2Ca phase changed significantly. The grains of the extruded Mg–7Li–3Al–xCa alloys were refined by dynamic recrystallization during the extrusion process. The tensile tests results indicated that the extruded Mg–7Li–3Al–0.4Ca alloy exhibited favorable comprehensive mechanical properties; its ultimate tensile strength was 286 MPa, the yield strength was 249 MPa, and the elongation was 18.7%. The corrosion results showed that this alloy with 0.4 wt.% Ca addition exhibited superior corrosion resistance, with a corrosion potential Ecorr of −1.48742 VVSE, attributed to the formation of protective Al2Ca phases.

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Prominent role of a high volume fraction of Mg17Al12 particles on tensile behaviors of rolled Mg–Al–Zn alloys

Cited by 64 publications

References 40 publications

Superplastic Deformation Behavior of Rolled Mg-8Al-2Sn and Mg-8Al-1Sn-1Zn Alloys at High Temperatures

Superplastic Deformation Behavior of Rolled Mg-8Al-2Sn and Mg-8Al-1Sn-1Zn Alloys at High Temperatures

Multimodal Microstructure and Mechanical Properties of AZ91 Mg Alloy Prepared by Equal Channel Angular Pressing plus Aging

Effect of Ca Content on the Mechanical Properties and Corrosion Behaviors of Extruded Mg–7Li–3Al Alloys

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