Microstructure and Thermal Stability of Icosahedral Quasicrystals in Suction Casting Al-6 at.%Mn(-2 at.%Be) Alloys

Chen, Zhongwei; Zhang, Qi; Dong, Bolong; Liu, Zhiqiang

doi:10.1007/s11665-019-04519-9

Cited by 2 publications

(3 citation statements)

References 25 publications

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Section: Discussionmentioning

confidence: 88%

“…Solute flux, heat flow, and competitive growth between adjacent crystals are important external factors that affect the non-equilibrium crystal growth [30]. As can be seen from previous studies [10,25], it can be shown that, with an increase in the solute Mn content, the morphology of the Al 6 Mn compound phase in vacuum suction casting Al-Mn alloys changes greatly. In fact, the vacuum suction casting cylindrical copper mold has a great influence on the heat flow and solute transport of the melt [31].…”

Section: Discussionmentioning

confidence: 89%

“…Song et al [8] added Be to Al-Mn alloy to successfully enhance the quasicrystal-forming ability. Other works [9,10] suggested that Be addition to the Al-Mn alloy influences a reduction in not only the critical amount of Mn element required to form quasicrystalline phases, but also the critical cooling rate for I-phase formation. Inoue et al [11] obtained a quasicrystalline structure alloy with high tensile strength and good bending ductility by adding transitional elements to the Al-Mn alloy.…”

Section: Introductionmentioning

confidence: 99%

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Dendrite Morphology Evolution of Al6Mn Phase in Suction Casting Al–Mn Alloys

Chen

Hou

Xie³

et al. 2020

Materials

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The effects of solute element content and cooling rate on the morphology of Al6Mn phase in suction casting Al–Mn alloys were investigated by transmission electron microscope, scanning electron microscope, and X-ray diffractometer. Results show that Al6Mn dendrite morphology with different degrees of development can occur in the microstructure of as-cast Al–Mn alloys. For the Al–4 wt.% Mn alloy, there are small amounts of block Al6Mn crystals at the center of sample, while we see a block Al6Mn phase and a feathery Al6Mn phase in the sample of Al–6 wt.% Mn alloy. Moreover, the block Al6Mn phases in the Al–8 wt.% Mn alloy disappear, and only snowflake-like Al6Mn phases play a dominant role in the microstructure. However, with an increase in Mn content to 10 wt.%, more dendritic trunks are formed, and secondary dendrite arms are degraded more seriously due to the formation of an icosahedral quasicrystal in suction casting. In addition to the effect of Mn content on Al6Mn morphology, with the increase in cooling rate from the center to the edge of samples, the outline diameter of equiaxed dendrite decreases. The evolution of Al6Mn dendrite morphology and the formation of quasicrystal are further discussed.

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Section: Discussionmentioning

confidence: 88%

Section: Discussionmentioning

confidence: 89%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Dendrite Morphology Evolution of Al6Mn Phase in Suction Casting Al–Mn Alloys

Chen

Hou

Xie³

et al. 2020

Materials

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Precipitation Behavior of the Metastable Quasicrystalline I-Phase and θ′-Phase in Al-Cu-Mn Alloy

Mikhaylovskaya

Mukhamejanova

Котов

et al. 2023

Metals

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The precipitation behavior and mechanical properties for conventionally solidified Al-2.0wt.%Cu-2.0wt.%Mn alloy were studied. The supersaturated aluminum-based solid solution, CuAl2, Al6Mn and Al20Cu2Mn3 phases of solidification origin were identified after casting. The high temperature ageing of as-cast samples (T5 treatment) in a temperature range of 300–350 °C led to the formation of the metastable θ′ phase and equiaxed precipitates of the quasicrystalline-structured I-phase. The θ′ phase demonstrated a high size stability in a studied temperature range with a mean length of ~300 nm and a mean thickness of ~24 nm. A mean size of the I-phase precipitates varied in a range of ~30–50 nm depending on the treatment regimes. The rod-shaped T-phase precipitates were formed with an increase in ageing temperature to 400 °C. Mechanical properties were analyzed at room temperature in a solid solution-treated state. The increased yield strength at room temperature and 200–300 °C were observed after ageing at 300 °C for 148 h.

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Microstructure and Thermal Stability of Icosahedral Quasicrystals in Suction Casting Al-6 at.%Mn(-2 at.%Be) Alloys

Cited by 2 publications

References 25 publications

Dendrite Morphology Evolution of Al6Mn Phase in Suction Casting Al–Mn Alloys

Dendrite Morphology Evolution of Al6Mn Phase in Suction Casting Al–Mn Alloys

Precipitation Behavior of the Metastable Quasicrystalline I-Phase and θ′-Phase in Al-Cu-Mn Alloy

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