Solidification and Structural Characteristics of α(Al)–Mg<SUB>2</SUB>Si Eutectic

• Li Shunpu

  Institute of Physics, Academia Sinica

• Zhao Shengxu

  Institute of Physics, Academia Sinica

• Pan Mingxiang

  Institute of Physics, Academia Sinica

• Zhao Deqian

  Institute of Physics, Academia Sinica

• Chen Xichen

  Institute of Physics, Academia Sinica

• Barabash O. M.

  Institute of Metal Physics

• Barabash R. I.

  Institute of Metal Physics

Bibliographic Information

Other Title

• Solidification and Structural Characteristics of α(Al)-Mg2Si Eutectic
• Solidification and Structural Character
• Solidification and Structural Characteristics of &alpha;(Al)&ndash;Mg<SUB>2</SUB>Si Eutectic

Abstract

Solidification and structural characteristics of α(Al)–Mg₂Si eutectic in the Al–Mg–Si system were investigated by thermoanalysis and directional solidification techniques. The two-phase eutectic line of L⇔α(Al)+Mg₂Si, the temperature-change section of a pseudobinary α(Al)–Mg₂Si system and the eutectic coupled zone within this section have been measured accurately. It was demonstrated that the coupled zone in the pseudobinary α(Al)–Mg₂Si system could be described as C=1.35×10³V+C₀, where C is the molar percentage of Mg₂Si, V is the solidification velocity in m/s, C₀ is the molar percentage of Mg₂Si when the eutectic structure is obtained through a near-equilibrium solidification, and 3.65 mol%<C₀<5.0 mol%. In this system, Mg₂Si is the nucleating and leading phase during eutectic growth, and the primary crystals exhibits a morphology of regular hexahedron with {100} faces. In the eutectic alloy, the morphology of phase Mg₂Si transforms from lamellae to rods when the solidification velocity is higher than 1.1×10⁻⁵ m/s. The relationship between the lamellar or interrod spacing, λ of eutectic Mg₂Si and the solidification velocity, V, fits the equation<BR>λ^1.93V=7.1×10⁻¹⁷G^−0.414<BR>where G is the temperature gradient ahead of the solid-liquid interface in the melt, which is in K/m, λ is in m and V is in m/s.

Journal

• Materials Transactions, JIM

  Materials Transactions, JIM 38 (6), 553-559, 1997

  The Japan Institute of Metals

Keywords

• α(Al)–Mg<SUB>2</SUB>Si pseudobinary eutectic
• directional solidification
• structural characteristics

Details

• CRID: 1390282679222389888
• NII Article ID: 130003556938
• NII Article ID: 10002452958
• NII Book ID: AA10699969
• DOI: 10.2320/matertrans1989.38.553
• COI: 1:CAS:528:DyaK2sXlt1Ggt7g%3D
• ISSN: 2432471X
• ISSN: 09161821
• NDL BIB ID: 4251928
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I4251928
• Web Site: https://www.jstage.jst.go.jp/article/matertrans1989/38/6/38_6_553/_pdf
• Text Lang: en
• Data Source:
  • JaLC
  • NDL
  • Crossref
  • CiNii Articles
• Abstract License Flag: Disallowed