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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:
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 28/11/20 alle ore 00:59:21