Effect of semi-solid isothermal heat treatment on the microstructure of Mg–6A1–1Zn–0.7Si alloy

Yang, Ming‐Bo; Pan, Fusheng; Cheng, Renju; Bai, Liang

doi:10.1016/j.jmatprotec.2007.12.041

Cited by 32 publications

(4 citation statements)

References 22 publications

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“…The volume fraction of γ eutectic phase in non-equilibrium solidification state of experimental alloy is estimated to be about 1.7%. As is reported, a complete mixture in liquid state and a negligible diffusion in the solid are considered in Scheil model 15 . Therefore the real values of f s should be smaller than that of calculated one.…”

Section: Resultsmentioning

confidence: 99%

An investigation into the dissolution characteristics of γ precipitates in Mg-3Al-Zn alloy

2014

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In non-equilibrium conditions, the coring phenomena may occur in the α-Mg solid solution and γ-Mg 17 Al 12 phase forms in the microstructure of AZ magnesium alloy series. This eutectic phase may introduce detrimental effect on workability of wrought alloys. In the present work, the dissolution characteristics of γ phase have been investigated in AZ31 wrought magnesium alloy. Considering the eutectic temperature of AZ31 alloy, the homogenization treatment was executed in temperature range of 300-437 °C (i.e., somewhat below eutectic melting temperature of γ precipitate) and 437-500 °C (i.e., higher eutectic melting temperature of γ precipitate) for different durations. A thorough microstructural investigation and also thermodynamic calculations were executed. The results indicated that the dissolution rate of γ phase is very low even at temperatures just below the eutectic point of the alloy, whereas it dramatically increases at temperatures higher than eutectic point. Moreover, it is suggested that partial melting of γ phase due to eutectic melting reaction (α+γ→L) may lead to reduced formability.

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Section: Resultsmentioning

confidence: 99%

An investigation into the dissolution characteristics of γ precipitates in Mg-3Al-Zn alloy

2014

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“…Thereinto which the Mg-Si based alloy has been used as heat-resistant light metal materials for high temperature applications for a long period [3] . However, since the maximum solid state solubility of pure Si at room temperature is extremely low and the pure Si is very difficult to dissolve into solid Mg matrix alloys, so it mainly exists in the form of intermetallic compound as Mg2Si phase in the Mg-Si based alloy [4] . Although the Mg2Si phase can be used as a favorable heat-resistant strengthening phase in metal materials because it has a series of excellent performance characteristics [5] .…”

Section: Introductionmentioning

confidence: 99%

Study on the influences of different process temperatures on microstructural evolution of Mg-11%Al-2%Zn-1%Si alloy through isothermal semi-solid treatment

Xu²,

Wang

et al. 2023

J. Phys.: Conf. Ser.

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Due to the eutectic reaction, the Mg2Si phase is inclined to creating an unfavorable fishbone shape at low solidification rates. This can significantly degrade the mechanical characteristics and become the main barrier to the practical application of Mg-Si based alloy. It is regarded that isothermal semi-solid treatment is an efficient technique to modulate the fishbone-shape eutectic Mg2Si phases in Mg-Si based alloys. In this work, a new type of Mg-11%Al-2%Zn-1%Si alloy is successfully fabricated through isothermal semi-solid treatment, and the influences of different process temperatures on microstructural evolution of Mg-11%Al-2%Zn-1%Si alloy are studied. The findings illustrate that the mean size of the α-Mg grains increases and their trendency of spheroidization becomes more evidently after held for 30 min at different process temperatures from 550 °C to 580 °C. Additionally, through isothermal semi-solid treatment, the eutectic Mg2Si phases in experimental alloy are totally changed from their original fishbone shape into polygon or granule shapes. With increasing the process temperatures, the mean size and morphologies of eutectic Mg2Si phases have no significantly changes. The morphological change theory of eutectic Mg2Si phases through isothermal semi-solid treatment is also studied.

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“…However, most of the existing investigations about magnesium alloys have been focused on some previously deformed alloys 2,[8][9][10][11][12][13][14] . Only a few papers have involved the as-cast alloys, but they all emphasized on the morphology change and coarsening behavior of primary particles in semisolid state [15][16][17][18][19][20][21] . It can be expected that, to verify how the equiaxed dendrites in as-cast microstructure evolve into the spheroidal solid particles in semisolid microstructure, the whole microstructural evolution, especially the microstructure change before liquid formation during particle remelting should be clarified.…”

Section: Introductionmentioning

confidence: 99%

Semisolid microstructure evolution of AZ91D magnesium alloy refined by Al-Ti-B

Chen

Wang

et al. 2011

Mat. Res.

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The microstructural evolution and corresponding phase transformations have been investigated during partial remelting of AZ91D magnesium alloy refined by Al-Ti-B master alloy. The effect of heating temperature on semisolid microstructure has also been discussed. The results indicate that the microstructural evolution process includes four stages, the initial rapid coarsening, structure separation, spheroidization accompanied by coarsening and the final coarsening. Two or more equiaxed dendrites in the as-cast microstructure evolve into one spheroidal primary particle in the semisolid microstructure through the former three stages. The initial rapid coarsening results from the reaction of b→a, the structure separation is due to the a + b→L and a→L, the spheroidization is attributed to the a→L and the final coarsening is ascribed to the two reverse reactions of a→L and L→a. Rising the heating temperature during partial remelting is beneficial for obtaining small and spheroidal primary particles.

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Effect of semi-solid isothermal heat treatment on the microstructure of Mg–6A1–1Zn–0.7Si alloy

Cited by 32 publications

References 22 publications

An investigation into the dissolution characteristics of γ precipitates in Mg-3Al-Zn alloy

An investigation into the dissolution characteristics of γ precipitates in Mg-3Al-Zn alloy

Study on the influences of different process temperatures on microstructural evolution of Mg-11%Al-2%Zn-1%Si alloy through isothermal semi-solid treatment

Semisolid microstructure evolution of AZ91D magnesium alloy refined by Al-Ti-B

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