Improved mechanical properties of Mg–9Al–1Zn alloy by the combination of aging, cold-rolling and electropulsing treatment

Jiang, Yong; Guan, Lei; Tang, Guoyi; Zhang, Zhihao

doi:10.1016/j.jallcom.2014.11.154

Cited by 41 publications

(7 citation statements)

References 23 publications

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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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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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“…Comparing the effect of EPT on phase transition with conventional heat treatment, an additional energy term for the total Gibbs free energy results from the electric current in the conductor substantially decreased the apparent solid phase transition temperature. Jiang et al treated aged AZ91 magnesium alloy strips by dynamic electropulses [ 87 ]. For the phase transition α + β → α′, Δ G 0 denotes the energy barrier, while the free energy change of the current-carrying system of EPTΔ G EPT can be described by: Δ G EPT = Δ G 0 + Δ G e where Δ G e is an energy change due to a change in distribution of the current in the formation of a nucleus, and Δ G e ˂ 0 according to the electrical properties of the nucleus and the matrix.…”

Section: Effects Of Ept On Microstructure and Texturementioning

confidence: 99%

“…The combined treatments of aging, cold-rolling and EPT were carried out on the AZ91 alloy strips. The ultimate tensile strength, yield strength and elongation to failure of the EPT-samples were improved by 11–12%, 10% and 70–75%, respectively [ 87 ]. Jiang et al have noted that the hardness of the cold-rolled AZ91 magnesium alloy decreased with the increased pulse frequency, which was attributed to a reduction in dislocation density [ 52 , 68 ].…”

Section: Effects Of Ept On the Properties Of Materialsmentioning

confidence: 99%

Application of High-Density Electropulsing to Improve the Performance of Metallic Materials: Mechanisms, Microstructure and Properties

et al. 2018

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The technology of high-density electropulsing has been applied to increase the performance of metallic materials since the 1990s and has shown significant advantages over traditional heat treatment in many aspects. However, the microstructure changes in electropulsing treatment (EPT) metals and alloys have not been fully explored, and the effects vary significantly on different material. When high-density electrical pulses are applied to metals and alloys, the input of electric energy and thermal energy generally leads to structural rearrangements, such as dynamic recrystallization, dislocation movements and grain refinement. The enhanced mechanical properties of the metals and alloys after high-density electropulsing treatment are reflected by the significant improvement of elongation. As a result, this technology holds great promise in improving the deformation limit and repairing cracks and defects in the plastic processing of metals. This review summarizes the effect of high-density electropulsing treatment on microstructural properties and, thus, the enhancement in mechanical strength, hardness and corrosion performance of metallic materials. It is noteworthy that the change of some properties can be related to the structure state before EPT (quenched, annealed, deformed or others). The mechanisms for the microstructural evolution, grain refinement and formation of oriented microstructures of different metals and alloys are presented. Future research trends of high-density electrical pulse technology for specific metals and alloys are highlighted.

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“…6b. In general, EPT can significantly reduce the dislocation density via annihilation of dislocation in heavily deformed metals and alloys [17][18]37].…”

Section: Kinetic Effects Of Electric Currentmentioning

confidence: 99%

Stability of martensite with pulsed electric current in dual-phase steels

Qin

2016

Materials Science and Engineering: A

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Softening frequently occurs in dual-phase steels under isothermal tempering of martensite.Recently, non-isothermal tempering is implemented to decrease the softening process in dualphase steels. Here, we have discovered using high power electropulsing treatment can significantly enhance the strengthening effects via the formation of ultrafine-grained ferrite with nano-cementite particles in tempered martensitic-ferritic steels. To the best our knowledge, electropulsing treatment is a proper candidate to retard even to recovery the softening problems in the tempering of martensite in comparison with other isothermal and non-isothermal tempering methods.

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Improved mechanical properties of Mg–9Al–1Zn alloy by the combination of aging, cold-rolling and electropulsing treatment

Cited by 41 publications

References 23 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

Application of High-Density Electropulsing to Improve the Performance of Metallic Materials: Mechanisms, Microstructure and Properties

Stability of martensite with pulsed electric current in dual-phase steels

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