Strain-induced dynamic precipitation of Mg17Al12 phases in Mg–8Al alloys sheets rolled at 748 K

Guo, Fei; Zhang, Dingfei; Yang, Xusheng; Jiang, Luyao; Pan, Fusheng

doi:10.1016/j.msea.2015.03.112

Cited by 81 publications

(14 citation statements)

References 28 publications

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“…Around the precipitation agglomeration regions, a large number of newly formed DRX grains can be found and the sub-micron precipitations were distributed more widely at the boundaries of DRX grains. This is consistent with the findings of Guo et al [2], Huang et al [23], and Zhu et al [24] for the investigation of the large strain hot rolling processed Mg-8Al alloy sheets, extrusion processed AZX912 alloy and multidirectional forging (MDF) processed AZ80 alloy, respectively. They all observed the dynamic precipitation, and eventually the granular and inhomogeneous distribution β-Mg17Al12 phase caused the formation of the coarse-grain and fine-grain zones.…”

Section: Methodssupporting

confidence: 92%

“…AZ80 is one of the most successful commercial magnesium alloys with high-performance and high-strength, which has already been applied in the fields of aerospace, high-speed railways and automobiles in recent years [1][2][3]. However, magnesium alloy exhibits poor plastic deformation at room temperature owing to the hexagonal close-packed (HCP) structure with a limited number of slip systems [4,5].…”

Section: Introductionmentioning

confidence: 99%

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Effect of Y Addition on the Semi-Solid Microstructure Evolution and the Coarsening Kinetics of SIMA AZ80 Magnesium Alloy

Tang

Sun

Zhou

et al. 2017

Metals

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Semi-solid feedstock of AZ80 magnesium alloy modified by trace rare-earth Y element (0, 0.2, 0.4, 0.8 wt. %) was fabricated by strain-induced melting activation (SIMA) in the form of extrusion and partial remelting. The effect of Y addition on the microstructure evolution of the extruded and isothermally heat treated alloy was observed by using an optical microscope (OM), scanning electron microscope (SEM), X-ray diffraction (XRD) and quantitative analysis. The results show that the Y addition can refine the microstructure and make the β-Mg 17 Al 12 phases agglomerate. During the subsequent isothermal treatment at 570 • C, the average solid grain size, shape factor and liquid fractions increased with the prolonged soaking time. The smaller spheroidal solid grains and larger shape factor were obtained in the semi-solid microstructure due to Y addition. The coalescence and Ostwald ripening mechanism operated the coarsening process of solid grains simultaneously. The coarsening rate constants of AZ80M1 (0.2 wt. % Y addition) of 164.22 µm 3 ·s −1 was approximately four times less than the un-modified AZ80 alloy of 689.44 µm 3 ·s −1 . In contrast, the desirable semi-solid structure featured, with fine and well globular solid grains, an appropriate liquid fraction, and shape factor was achieved in AZ80M1 alloy treated at 570 • C for 20-30 min.

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Section: Methodssupporting

confidence: 92%

Section: Introductionmentioning

confidence: 99%

Effect of Y Addition on the Semi-Solid Microstructure Evolution and the Coarsening Kinetics of SIMA AZ80 Magnesium Alloy

Tang

Sun

Zhou

et al. 2017

Metals

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“…The strain-induced dynamic precipitation has been reported in several wrought Mg alloys [27,28]. For example, a dynamically precipitated Mg17Al12 phase was observed in DRXed grains of rolled Mg-8Al sheets [29]. In this study, after one-pass of FSP, most of the Mg2Sn phase in the SZ-4 mm region was dissolved into the α-Mg matrix and led to the formation of a supersaturated solid solution.…”

Section: Discussionsupporting

confidence: 52%

The Effect of Processing Pass on the Microstructure and Mechanical Properties of a Friction Stir Processed As-Cast Mg-6 wt % Sn Alloy

Zhang

Chen

Xiyun

et al. 2018

Metals

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In this study, as-cast Mg-6 wt % Sn alloy is subjected to one-pass and two-pass friction stir processing (FSP). The effect of processing pass on microstructure and mechanical properties of FSP Mg-6Sn alloy is investigated. It is found that one-pass FSP leads to the breakage and partial dissolution of the Mg2Sn phase in the stir zone (SZ) and two-pass FSP leads to the further dissolution and dynamic precipitation of the Mg2Sn phase. Dynamic recrystallization (DRX) takes place in the SZ of an Mg-6Sn alloy undergoing FSP. Compared to one-pass FSP, two-pass FSP brings about further grain refinement in the SZ. A strong {0001} basal texture is developed in the SZ of a Mg-6Sn alloy from FSP and the change of the sample region or processing pass has little influence on the texture. Compared to an as-cast Mg-6Sn sample, one-pass FSP brings about significant improvement in mechanical properties. Two-pass FSP leads to the further increase in yield strength (YS) and ultimate tensile strength (UTS) but elongation (EL) is reduced. The continuous increase in strength is attributed to the grain refinement and the dissolution and dynamic precipitation of Mg2Sn phase achieved by FSP.

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“…Reference [28] shows that the amount, size, distribution and morphology of β-Mg17Al12 phase play a critical part of the strength and plasticity of Mg-Al alloys. As shown in Fig.…”

Section: Mechanical Properties Of Az91 Magnesium Alloymentioning

confidence: 99%

Effect of pre-homogenizing treatment on microstructure and mechanical properties of hot-rolled AZ91 magnesium alloys

Zheng

Nie

Liang

et al. 2016

Journal of Magnesium and Alloys

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To improve the homogeneity and rolling formability of as-cast AZ91 magnesium, the effects of pre-homogenizing treatment on microstructure evolution, deformation mechanism, mechanical properties and tensile fracture morphology of hot-rolled AZ91 magnesium alloy were studied. The results showed that the amount of coarse β-Mg17Al12 phase decreases dramatically, being distributed along the grain boundaries as small strips after homogenizing. Twining plays a dominant role in the deformation mechanism of AZ91 alloys in the experimental condition, while dynamic recrystallization (DRX) considerably occurred in homogenized-rolled alloys, contributed to microstructure uniformity and β-Mg17Al12 phase precipitated refinement. The tensile strength of homogenized-rolled AZ91 alloys increases dramatically with elongation declining slightly in contrast to homogenized alloys. The fracture surface of homogenized-rolled specimen exhibits more ductile fracture with the manifestation of a large amount of dimples distributing higher density in matrix, while the micro cracks are prone to initiate around the Mg/Mg17Al12 phase interface and grain boundaries owing to the fragile interface bonding of two phases.

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Strain-induced dynamic precipitation of Mg17Al12 phases in Mg–8Al alloys sheets rolled at 748 K

Cited by 81 publications

References 28 publications

Effect of Y Addition on the Semi-Solid Microstructure Evolution and the Coarsening Kinetics of SIMA AZ80 Magnesium Alloy

Effect of Y Addition on the Semi-Solid Microstructure Evolution and the Coarsening Kinetics of SIMA AZ80 Magnesium Alloy

The Effect of Processing Pass on the Microstructure and Mechanical Properties of a Friction Stir Processed As-Cast Mg-6 wt % Sn Alloy

Effect of pre-homogenizing treatment on microstructure and mechanical properties of hot-rolled AZ91 magnesium alloys

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