Microstructure in the semi-solid state and mechanical properties of AZ80 magnesium alloy reheated from the as-cast and extruded states

Jiang, Wenyong; Chen, Tian; Wang, Liping; Feng, Yicheng; Zhu, Yanan; Kai-feng, Wang; Luo, Jiapeng; Zhang, Shouwei

doi:10.1007/s40195-012-0176-3

Cited by 10 publications

(7 citation statements)

References 41 publications

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“…Semisolid processing (SSP), as a near net-shape manufacturing technology, is of high economic and technical interest. SSP combines the advantages of casting and forging [4] and has been successfully performed on nonferrous alloys [5][6][7][8], steels [9,10] and composites [11]. The preparation of semisolid slurry with a microstructure consisting of equiaxed grains and continuous liquid films at grain boundaries is essential for subsequent processing [12].…”

Section: Introductionmentioning

confidence: 99%

Influence of Processing Parameters on Microstructural Evolution and Tensile Properties for 7075 Al Alloy Prepared by an ECAP-Based SIMA Process

Jiang

Wang

2017

Acta Metall. Sin. (Engl. Lett.)

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A modified strain-induced melt activation (SIMA) process consisting of homogenization, equal-channel angular pressing (ECAP) and subsequent heating to the semisolid temperatures was introduced to prepare the 7075 aluminum alloy with superior thixotropic behaviors. The effects of both the homogenization and the number of ECAP passes, as well as the isothermal temperatures on the microstructural evolution, were investigated. The results indicate that ideal microstructure wherein fine and globular solid grains surrounded by uniform liquid films can be achieved through ECAP deformationrecrystallization mechanism. Increasing the number of ECAP passes accelerates the recrystallization of strained grains, thus reducing the average grain size and improving the grain sphericity. Moreover, higher holding temperatures and prolonged soaking time can improve the growth of the solid grains. Two main coarsening mechanisms, viz. coalescence and Ostwald ripening, contribute to the growth of the solid grains simultaneously and independently. The tensile strength of the 7075 alloys after four-pass ECAP-based SIMA and T6 heat treatment is relatively lower than the as-received billet, while the elongation of SIMA processed samples is much higher than that of as-received ones. Increasing the number of ECAP passes improves the tensile strength for alloys with and without T6 treatment due to the fine grain strengthening mechanism.

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Section: Introductionmentioning

confidence: 99%

Influence of Processing Parameters on Microstructural Evolution and Tensile Properties for 7075 Al Alloy Prepared by an ECAP-Based SIMA Process

Jiang

Wang

2017

Acta Metall. Sin. (Engl. Lett.)

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“…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%

“…Furthermore, the coarse second phases with lower melting points in original microstructure can be effectively crushed. This may hasten the evolution of globular structure during the SSIT route, resulting in high-quality semi-solid feedstock with more spherical and smaller solid grains [3,17].…”

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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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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“…AZ80 is one of the most successful commercial magnesium alloys with the high-performance 28 and high-strength, which has already been applied in the fields of aerospace, high-speed railway and 29 automobiles in recent years [1][2][3]. However, magnesium alloy exhibits poor plastic deformation at 30 room temperature owing to [the] hexagonal close-packed (HCP) structure with a limited number of 31 slip systems [4,5].…”

mentioning

confidence: 99%

“…And the coarse second phases with lower melting point 59 in original microstructure can be effectively crushed. This may hasten the evolution of globular 60 structure during [the] SSIT route, resulting in the high-quality semi-solid feedstock with more 61 spherical and smaller solid grains [3,17].…”

mentioning

confidence: 99%

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

Tang¹,

Sun²,

Zhou³

et al. 2017

Preprint

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Microstructure in the semi-solid state and mechanical properties of AZ80 magnesium alloy reheated from the as-cast and extruded states

Cited by 10 publications

References 41 publications

Influence of Processing Parameters on Microstructural Evolution and Tensile Properties for 7075 Al Alloy Prepared by an ECAP-Based SIMA Process

Influence of Processing Parameters on Microstructural Evolution and Tensile Properties for 7075 Al Alloy Prepared by an ECAP-Based SIMA Process

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

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