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Structure and Recalescence Behavior of Underctoled Nickel-Tin Alloys

Published online by Cambridge University Press:  21 February 2011

Yanzhong WU ,
Thomas J. Piccone ,
Yuh Shiohara  and
Merton C. Flemings
Yanzhong WU
Affiliation:
Massachusetts Institute of Technolocy, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, USA
Thomas J. Piccone
Affiliation:
Massachusetts Institute of Technolocy, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, USA
Yuh Shiohara
Affiliation:
Massachusetts Institute of Technolocy, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, USA
Merton C. Flemings
Affiliation:
Massachusetts Institute of Technolocy, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, USA
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Abstract

Small nickel-tin alloy samples (3.2 g) were bulk undercooled in a Pyrex-brand borosilicate glass medium using a levitation melter. Recalescence was directly observed utilizinq a rapid thermal measurement system (resnonse time less than 10 us) consisting of two silicon photodiodes, signal amplification system, and a digital storarie device.

Results of this research include: (1) measured undercoolings ranqed up to about 250 K; (2) both total solidification time and recalescence time become shorter with increasing initial undercooling; (3) in the case of hypoeutectic (Ni-25wt%Sn) alloy, a range of recalescence times was observed from 500 ms for a low undercooling (about 35 K) to 2 ms for a hiqh undercooling (about 230 K); (4) thermal profiles upon solidification of hypoeutectic comnosition alloys showed the existence of two distinct nucleation events; (5) although cooling rates before nucleation were generally low (<50 K/s), structures of fineness expected in rapid solidification processing were typically observed; (6) fineness of microstructure increases with increasing undercooling; and (7) uniform distribution of second phase was achieved by increasing undercoolina.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 28: Symposium F – Rapidly Solidified Metastable Materials , 1983 , 37
Copyright
Copyright © Materials Research Society 1984

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References

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