Enhanced strength and ductility of AZ80 Mg alloys by spray forming and ECAP

Tang, Lingling; Zhao, Yaohua; Исламгалиев, Р. К.; Tsao, Chi Y.A.; Valiev, Ruslan Z.; Lavernia, Enrique J.; Zhu, Yuntian

doi:10.1016/j.msea.2016.06.031

Cited by 64 publications

(15 citation statements)

References 75 publications

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“…The multimodal grain structure was also responsible for the improvement of ductility. According to the study of Zhu et al, strain partitioning would exist during the deformation of heterogeneous materials, and the occurrence of strain gradients led to back-stress work hardening [49]. Wang et al also attributed the high uniform ductility of the HPRed AZ91 alloy to the strong work hardening resulting from the multimodal grain structure [19].…”

Section: Discussionmentioning

confidence: 99%

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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Section: Discussionmentioning

confidence: 99%

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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“…Improving the strength and in-service properties becomes possible due to the formation of the ultrafine-grained (UFG) structure and a profuse system of grain boundaries in the materials. In addition, there are cases of increased ductility of materials after SPD, as observed for example for magnesium [25,26,27] and aluminum [28,29] alloys. In the case of magnesium alloys, the formation of a specific texture in the ECAP process often leads to a situation where the ductility of the alloy increases but there is no significant strengthening, despite a pronounced grain refinement [30,31].…”

Section: Introductionmentioning

confidence: 99%

The Effect of Equal-Channel Angular Pressing on the Microstructure, the Mechanical and Corrosion Properties and the Anti-Tumor Activity of Magnesium Alloyed with Silver

et al. 2019

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The effect of equal-channel angular pressing (ECAP) on the microstructure, texture, mechanical properties, corrosion resistance and cytotoxicity of two magnesium-silver alloys, Mg-2.0%Ag and Mg-4.0%Ag, was studied. Their average grain size was found to be reduced to 3.2 ± 1.4 μm and 2.8 ± 1.3 μm, respectively. Despite the substantial grain refinement, a drop in the strength characteristics of the alloys was observed, which can be attributed to the formation of inclined basal texture. On a positive side, an increase in tensile ductility to ~34% for Mg-2.0%Ag and ~27% for Mg-4.0%Ag was observed. This effect can be associated with the activity of basal and prismatic slip induced by ECAP. One of the ECAP regimes tested gave rise to a drop in the corrosion resistance of both alloys. An interesting observation was a cytotoxic effect both alloys had on tumor cells in vitro. This effect was accompanied with the release of lactate dehydrogenase, an increase in oxidative stress, coupled with the induction of NO-ions and an increase in the content of such markers of apoptosis as Annexin V and Caspase 3/7. Differences in the chemical composition and the processing history-dependent microstructure of the alloys did not have any significant effect on the magnitude of their antiproliferative effect.

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“…Magnesium (Mg) alloy is promising for aerospace and automotive industries due to their low density, low cost, and high specific strength. [1][2][3][4][5][6] However, the wider application of cast Mg alloys is hindered by some defects such as inclusions and gas porosity. Thus, extensive efforts have been paid to improve their mechanical properties by alloying addition, [7,8] severe deformation, [9,10] and so on.…”

Section: Introductionmentioning

confidence: 99%

Influence of Aging Prior to Extrusion on the Microstructure and Mechanical Properties of an Extruded AZ91 Alloy

et al. 2020

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Herein, aging prior to extrusion is used to regulate the microstructure and mechanical properties of an extruded AZ91 alloys. The results show that pre‐aging can induce numerous precipitates in Mg matrix to refine the recrystallized microstructure during hot extrusion of AZ91 alloys. After extrusion, most precipitates distribute at grain boundaries, suppressing grain growth. Thus, coupling pre‐aging and hot extrusion can effectively enhance the yield strength of the AZ91 alloy and maintain considerable plasticity (>15%) simultaneously. In contrast, the improvement in mechanical properties is not so effective by direct extrusion and subsequent heat treatment. Although the subsequent aging (T6 treatment) can induce dense precipitates inside grains generating strong precipitation hardening, it badly reduce the tensile ductility (to 6.3%) as well. Moreover, the T6 treated sample also exhibits lower yield strength compared with the extruded sample via coupling pre‐aging and hot extrusion. Based on the experimental analyses, the underline mechanisms are discussed.

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Enhanced strength and ductility of AZ80 Mg alloys by spray forming and ECAP

Cited by 64 publications

References 75 publications

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

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

The Effect of Equal-Channel Angular Pressing on the Microstructure, the Mechanical and Corrosion Properties and the Anti-Tumor Activity of Magnesium Alloyed with Silver

Influence of Aging Prior to Extrusion on the Microstructure and Mechanical Properties of an Extruded AZ91 Alloy

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