Tie lines of the grain boundary wetting phase transition in the Al-Sn system

Journal Article · Mon Aug 01 04:00:00 EDT 1994 · Journal of Phase Equilibria

DOI:https://doi.org/10.1007/BF02647558· OSTI ID:421413

Straumal, B; Gust, W ^[1]; Molodov, D ^[2]

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1. Max-Planch-Institut fuer Metallforschung, Stuttgart (Germany)
2. Institut fuer Metallkunde und Metallphysik, Aachen (Germany)

Temperature dependencies of contact angles {theta} at the intersection of grain boundaries in Al bicrystals with solid Al/liquid Al-Sn interphase boundaries were studied. For this purpose, two Al bicrystals were grown with tilt <011>(001) grain boundaries having misorientation angles {var_phi} = 38.5{degrees} (near {Sigma}9 coincidence misorientation) and {var_phi} = 32{degrees}. These boundaries possess different energies. The temperatures T{sub w} of the grain boundary wetting phase transition for these two boundaries were determined, and the corresponding conodes in the two-phase area of the Al-Sn phase diagram were constructed. Above T{sub w}, the contact angle {theta} = 0 and a layer of the liquid phase completely wets the grain boundary. The temperature of wetting transition T{sub w1} = 6047 {+-} 1{degrees}C, for the grain boundary with high energy ({var_phi} = 32{degrees}) is lower than T{sub w2} = 6177 {+-} 1{degrees}C for the grain boundary with low energy ({var_phi} = 38.5{degrees}). Above the temperature interval where all the grain boundaries become wetted, the solid phase may exist only as isolated single crystalline {open_quotes}islands{close_quotes} in the {open_quotes}sea{close_quotes} of melted phase.

• Sponsoring Organization: USDOE
• OSTI ID: 421413
• Journal Information: Journal of Phase Equilibria, Journal Name: Journal of Phase Equilibria Journal Issue: 4 Vol. 15; ISSN JPEQE6; ISSN 1054-9714
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM ALLOYS
BICRYSTALS
GRAIN BOUNDARIES
PHASE DIAGRAMS
PHASE TRANSFORMATIONS
SOLUBILITY
TEMPERATURE DEPENDENCE
TIN ALLOYS