Skip to main content
×
×
Home

Structure and Recalescence Behavior of Underctoled Nickel-Tin Alloys

  • Yanzhong WU (a1), Thomas J. Piccone (a1), Yuh Shiohara (a1) and Merton C. Flemings (a1)
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.

Copyright
References
Hide All
1. Colligan, G.E. and Bayles, B.J., Acta Met. 10, 895897 (1962).
2. Huang, S.C. and Glicksman, M.E., Acta Met. 29, 701715 (1981).
3. Kobayashi, K. and Shingu, H.P., Proceedings of the 4th International Conference on Rapidly Quenched Metals, Masumoto, T. and Suzuki, K. (Eds.) Sendai, Japan, 103106 (1981).
4. Coriell, S.R. and Turnbull, D., Acta Met. 30, 21352139 (1982).
5. Flemings, M.C. and Shiohara, Y., Soecial Issue of Materials Science and Engineering: “Solidification Microstructure: Thirty Years After Constitutional Supercooling,” Jones, H. and Kurz, W. (Eds.), to be published.
6. Baker, J.C. and Cahn, J. W., “Solidification,” ASM, 23 – 58 (1971).
7. Shiohara, Y., Chu, M.G., and Fleminqs, M.C., Proceedings of the US/Japan Cooperative Science Program Seminar on “Solidification Processing,” Dedham, MA, Flemings, M.C. and Ohira, G. (Eds.), 375 – 402 (1983).
8. Aziz, M.J., J. Appl. Phys. 53, 11581168 (1982).
9. Baker, J.C., Ph.D. Dissertation, Massachusetts Institute of Technology, (1970).
10. Shiohara, Y. and Flemings, H.C., Proceedings of the 2nd Conference on “Modeling of Casting and Weldina Processes,” Henniker, NH, August (1983), in press.
11. Flemings, M.C., “Solidification Processing,” McGraw-Hill, NY, NY (1974).
12. Kattamis, T.Z., Coughlin, J.M., and Flemings, M.C., Trans. AIME 239, 15041511 (1967).
13. Vorhees, P.W. and Glicksman, M.E., Proceedings of MRS Conference on “Rapidly Solidified Amornhouse and Crystalline Alloys,” Kear, B.H., Giessen, B.C., and Cohen, M. (Eds.), North Holland, 33 – 47 (1982).
Recommend this journal

Email your librarian or administrator to recommend adding this journal to your organisation's collection.

MRS Online Proceedings Library (OPL)
  • ISSN: -
  • EISSN: 1946-4274
  • URL: /core/journals/mrs-online-proceedings-library-archive
Please enter your name
Please enter a valid email address
Who would you like to send this to? *
×

Metrics

Full text views

Total number of HTML views: 0
Total number of PDF views: 3 *
Loading metrics...

Abstract views

Total abstract views: 72 *
Loading metrics...

* Views captured on Cambridge Core between September 2016 - 24th May 2018. This data will be updated every 24 hours.