Effect of Sn Addition on the Precipitation Behavior in AZ91 Magnesium Alloy

Kim, Jeong Kyun; Oh, Seung Hyun; Kim, Kang Cheol; Kim, Dong-Won; Kim, Do Hyang

doi:10.2320/matertrans.m2017011

Cited by 15 publications

(3 citation statements)

References 22 publications

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“…The coarse DP inhomogeneously distributed at the grain boundary, while the much smaller CP uniformly distributed inside grain. With increasing Sn content, the precipitation of Mg17Al12 phase was improved whilst the amount of Al atoms in the matrix was reduced [18]. The Mg2Sn precipitate was always accompanied by the divorced eutectic β-phase ( Figure 3).…”

Section: Resultsmentioning

confidence: 99%

“…Mg 2 Sn precipitates earlier from the melt during solidification process, and therefore could provide heterogeneous nuclei for Mg 17 Al 12 in eutectic reaction. Kim et al studied the solidification behavior of AZ91−xSn alloy (x = 1, 3, 5, mass%) and found that addition of Sn led to suppression of the discontinuous precipitation as well as significant improvement of hardness and strength [18]. However, Li's study showed that the hardness decreased with increasing Sn content from 0.5 to 1 mass%.…”

Section: Introductionmentioning

confidence: 99%

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Rheological Solidification Behavior and Mechanical Properties of AZ91-Sn Alloys

et al. 2019

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The solidification and tensile deformation behaviors of rheo-cast AZ91-Sn alloys were revealed to study the effects of Sn alloying on improvement of AZ91 alloy’s mechanical properties. Two kinds of Mg17Al12 phases precipitated from the supersaturated magnesium matrix during rheo-solidification were observed: coarse discontinuous precipitates (DP) at grain boundaries and small-sized continuous precipitates (CP) inside grains. With increasing Sn content, the amount of Mg17Al12 phases was increased whilst the amount of Al atoms in the matrix was decreased. Due to the higher melting point of Mg2Sn than Mg17Al12, Mg2Sn precipitated earlier from the melt, and therefore provided heterogeneous nuclei for Mg17Al12 during the eutectic reaction. Due to grain refinement and solid solution strengthening, AZ91-2.4Sn (mass%) gained 52% increase in tensile strength and 93% increase in elongation compared with pure AZ91 alloy. The higher-density twins and microcracks induced by Sn alloying relaxed stress concentration during plastic deformation, so the fracture mode was transformed from cleavage fracture of pure AZ91 alloy to ductile fracture of AZ91-Sn alloys.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Rheological Solidification Behavior and Mechanical Properties of AZ91-Sn Alloys

et al. 2019

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“…Recently, Mg-Al-Sn (AT) alloys have been showing promise. The addition of Sn to Mg alloy has many advantages [5][6][7][8][9][10][11]. Sn causes solid solution strengthening (solubility of Sn in Mg is 14.85 wt.% at the eutectic temperature of 561 • C), precipitation strengthening, and creep performance at elevated temperatures in binary Mg-Sn alloys.…”

Section: Introductionmentioning

confidence: 99%

Effects of Ce-Rich Misch Metal on the Microstructures and Tensile Properties of as-Cast Mg-7Al-3Sn-1Zn Alloys

Liu

Sun

Xiao

et al. 2021

Metals

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The effects of small amounts of Ce-rich misch metal (Mm: 0.5, 1.0 and 2.0 wt.%) addition on the microstructure and tensile properties of as-cast Mg-7Al-3Sn-1Zn wt.% (ATZ731) alloy have been investigated. The addition of Mm restricts the formation of the Mg17Al12 phase but greatly promotes the Al4Mm phase. The proper Mm addition enhances the strength and ductility of ATZ731 alloys at both room temperature (RT) and 175 °C. ATZ731 alloys with 1.0 wt.% Mm addition exhibit an advantageous combination strength and ductility, with the ultimate tensile strength (UTS), 0.2% yield strength (YS) and elongation to failure (Ef) at 175 °C of ~148 MPa, ~102 MPa and ~28%, improved by ~14.7%, ~24.3% and ~53.8%, respectively, compared to those of ATZ731 alloy. This enhancement is primarily owing to the refined microstructures and the high thermal stability of Al4Mm at the elevated temperature in contrast with that of the Mg17Al12 phase. The fracture modes are also discussed.

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Evolution of the Microstructure and Microsegregation in Subrapidly Solidified Mg–6Al–4Zn–1.2Sn Magnesium Alloy

Cui

Luo

et al. 2020

Adv Eng Mater

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The evolution of the microstructure and microsegregation in a new type of Mg–6Al–4Zn–1.2Sn (wt%) cast magnesium alloy solidified at cooling rates from 4.5 × 101 °C s−1 to 2.3 × 103 °C s−1 is investigated. The results indicate that the secondary dendrite arm spacing and the average grain sizes decrease from 14.3 to 2.9 μm and from 187 to 78 μm, respectively, as the cooling rate increases from 4.5 × 101 °C s−1 to 2.3 × 103 °C s−1. The relationship between the secondary dendrite arm spacing (λ2) and cooling rate (R) is fitted as λ2 = 69.7 × R−0.42. When the alloy solidifies in the range of cooling rates, a new quasi‐crystalline I phase is formed due to faster solidification. The microsegregation ratios of Al, Zn, and Sn elements decrease significantly with the increase in cooling rate. Compared with the specimen solidified at 4.5 × 101 °C s−1, the microsegregation ratios of Al, Zn, and Sn of that solidified at a cooling rate of 2.3 × 103 °C s−1 decrease by 37.4%, 45.7%, and 31.6%, respectively.

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Effect of Sn Addition on the Precipitation Behavior in AZ91 Magnesium Alloy

Cited by 15 publications

References 22 publications

Rheological Solidification Behavior and Mechanical Properties of AZ91-Sn Alloys

Rheological Solidification Behavior and Mechanical Properties of AZ91-Sn Alloys

Effects of Ce-Rich Misch Metal on the Microstructures and Tensile Properties of as-Cast Mg-7Al-3Sn-1Zn Alloys

Evolution of the Microstructure and Microsegregation in Subrapidly Solidified Mg–6Al–4Zn–1.2Sn Magnesium Alloy

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