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Record Details

Record 20 of 408
Bulk undercooling
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Author and Affiliation:
Kattamis, T. Z.(Connecticut Univ., Storrs, CT, United States)
Abstract: Bulk undercooling methods and procedures will first be reviewed. Measurement of various parameters which are necessary to understand the solidification mechanism during and after recalescence will be discussed. During recalescence of levitated, glass-encased large droplets (5 to 8 mm diam) high speed temperature sensing devices coupled with a rapid response oscilloscope are now being used at MIT to measure local thermal behavior in hypoeutectic and eutectic binary Ni-Sn alloys. Dendrite tip velocities were measured by various investigators using thermal sensors or high speed cinematography. The confirmation of the validity of solidification models of bulk-undercooled melts is made difficult by the fineness of the final microstructure, the ultra-rapid evolution of the solidifying system which makes measurements very awkward, and the continuous modification of the microstructure which formed during recalescence because of precipitation, remelting and rapid coarsening.
Publication Date: Sep 01, 1984
Document ID:
19840026520
(Acquired Nov 13, 1995)
Accession Number: 84N34591
Subject Category: METALLIC MATERIALS
Document Type: Conference Paper
Publication Information: NASA. Lewis Research Center Fundamentals of Alloy Solidification Appl. to Industrial Processes; p 15-32
Publisher Information: United States
Financial Sponsor: NASA; United States
Organization Source: Connecticut Univ.; Storrs, CT, United States
Description: 17p; In English
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: No Copyright
NASA Terms: RAPID QUENCHING (METALLURGY); SOLIDIFICATION; VAPORIZING; CORROSION RESISTANCE; EUTECTICS; FLOW VELOCITY; MICROSTRUCTURE; NUCLEATION; PHASE TRANSFORMATIONS; TRANSPORT PROPERTIES
Imprint And Other Notes: In NASA. Lewis Research Center Fundamentals of Alloy Solidification Appl. to Industrial Processes p 15-32 (SEE N84-34589 24-26)
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