The effect of enhanced gravity levels on microstructural development in Pb-50 wt pct Sn alloys during controlled directional solidification

Journal Article · Fri Apr 01 04:00:00 EST 1994 · Metallurgical Transactions, A (Physical Metallurgy and Materials Science); (United States)

DOI:https://doi.org/10.1007/BF02665463· OSTI ID:7029522

Battaile, C C ^[1]; Grugel, R N; Hmelo, A B; Wang, T G ^[2]

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1. Univ. of Michigan, Ann Arbor, MI (United States). Dept. of Materials Science and Engineering
2. Vanderbilt Univ., Nashville, TN (United States). Center for Microgravity Research and Applications

The Pb-50 wt pct Sn alloys were directionally solidified at 21.1 [mu]m s[sup [minus]1] through a temperature gradient of [approximately]3.5 K mm[sup [minus]1]. With the aid of a centrifuge, the solidifying dendritic interfaces were subjected to constant gravity levels, opposite to the growth direction, up to 15.3 times that of Earth's. Microstructural examination revealed no significant change in the secondary dendrite arm spacing, the interdendritic eutectic spacing, or the primary dendrite trunk diameter as a function of increasing gravity level; the primary dendrite arm spacing, however, decreased significantly. The primary spacing decrease is argued to result from suppressing convection in the bulk liquid or by modification of the rejected solute layer as a result of enhanced buoyancy.

• OSTI ID: 7029522
• Journal Information: Metallurgical Transactions, A (Physical Metallurgy and Materials Science); (United States), Journal Name: Metallurgical Transactions, A (Physical Metallurgy and Materials Science); (United States) Vol. 25:4; ISSN 0360-2133; ISSN MTTABN
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360102* -- Metals & Alloys-- Structure & Phase Studies
ALLOYS
CENTRIFUGES
CONCENTRATORS
DATA
EXPERIMENTAL DATA
GRAVITATION
INFORMATION
LEAD ALLOYS
MICROSTRUCTURE
NUMERICAL DATA
PHASE TRANSFORMATIONS
SOLIDIFICATION
TIN ALLOYS