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Titolo: SOLIDIFICATION AND STRUCTURAL CHARACTERISTICS OF ALPHA(AL)-MG2SI EUTECTIC
Autore: LI SP; ZHAO SX; PAN MX; ZHAO DQ; CHEN XC; BARABASH OM; BARABASH RI;
- Indirizzi:
- ACAD SINICA,INST PHYS,POB 603 BEIJING 100080 PEOPLES R CHINA UKRAINIAN ACAD SCI,INST MET PHYS UA-252142 KIEV UKRAINE ACAD SINICA,INST PHYS BEIJING 100080 PEOPLES R CHINA
- Titolo Testata:
- Materials transactions, JIM
fascicolo: 6,
volume: 38,
anno: 1997,
pagine: 553 - 559
- SICI:
- 0916-1821(1997)38:6<553:SASCOA>2.0.ZU;2-H
- Fonte:
- ISI
- Lingua:
- ENG
- Soggetto:
- GROWTH;
- Keywords:
- ALPHA(AL)-MG2SI PSEUDOBINARY EUTECTIC; DIRECTIONAL SOLIDIFICATION; STRUCTURAL CHARACTERISTICS;
- Tipo documento:
- Article
- Natura:
- Periodico
- Settore Disciplinare:
- Science Citation Index Expanded
- Science Citation Index Expanded
- Citazioni:
- 18
- Recensione:
- Indirizzi per estratti:
-
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- Citazione:
- S.P. Li et al., "SOLIDIFICATION AND STRUCTURAL CHARACTERISTICS OF ALPHA(AL)-MG2SI EUTECTIC", Materials transactions, JIM, 38(6), 1997, pp. 553-559
Abstract
Solidification and structural characteristics of alpha(Al)-Mg2Si eutectic in the Al-Mg-Si system were investigated by thermoanalysis and directional solidification techniques. The two-phase eutectic line of L double left right arrow alpha(Al) + Mg2Si, the temperature-change section of a pseudobinary alpha(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 alpha(Al)-Mg2Si systemcould be described as C = 1.35 x 10(3)V + C-O, where C is the molar percentage of Mg2Si, V is the solidification velocity in m/s, C-O is the molar percentage of Mg2Si when the eutectic structure is obtained through a near-equilibrium solidification, and 3.65 mol% < C-O < 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 x 10(-5) m/s. The relationship between the lamellar or interrod spacing, lambda of eutectic Mg2Si and the solidification velocity, V, fits the equation lambda(1.93)V = 7.1 x 10(-17)G(-0.414) where G is the temperature gradient ahead of the solid-liquid interface in the melt, which is in K/m, lambda is in m and V is in m/s.
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Documento generato il 24/01/21 alle ore 01:19:58