과편정 합금의 일방향 응고시 균일한 결정 성장

김신우; Shinwoo Kim

Korean Journal of Materials Research, Vol.10, No.1, 3-6, January, 2000

Export Citation

과편정 합금의 일방향 응고시 균일한 결정 성장

Uniform Crystal Growth during Directional Solidification of Hypermonotectic Alloys

김신우

호서대학교 신소재전공

Shinwoo Kim

Dept. of New Materilas Eng., Hoseo University, Chungnam 336-795, Korea

초록

지상에서는 과편정 합금의 응고시 일반적으로 조성과 밀도가 크게 다른 두 액상의 분리가 일어난다. 이외에 선택적 젖음성과 합체와 같은 인자들이 과편정 합금의 일방향응고시에 균일한 결정 성장을 어렵게 만든다. 그래서 이러한 불균일성을 제거하는 여러 가지 응고 방법들을 검토하고 일방향 응고와 더불어 초음파 에너지를 이용한 새로운 실험 결과를 제시하였다. 20kHz의 초음파를 진폭 및 합금 조성과 같은 변수들을 변화시켜 투명한 유기 과편정 Succinonitrile-Glycerol계에 적용하여 균일한 응고 조직을 얻었다.

Liquid-liquid phase separation due to the very different density and composition occurs when the hypermonotectic alloys are solidified on the ground. Besides this, other factors such as preferential wetting and coalescence make it difficult to get uniform microstructures during the directional solidification of hypermonotectic alloys. Therefore a few novel solidification methods to get rid of such a nonuniformity have been reviewed and the recent experimental work using ultrasonic energy in conjunction with directional solidification has been presented. The uniformly solidified structures have been obtained when the ultrasonic of 20kHz applied to transparent organic system, Succinonitrile-Glycerol, varying ultrasonic amplitude and composition etc.

Keywords:casting;composites;acoustic methods

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[2] Cahn JW, Metall. Trans. A, 10A, 119 (1979)

[3] LIvingston JD, Cline HE, Trans. TMS-AIME, 245, 351 (1969)

[4] Grugel RN, Hellawell A, Metall. Trans. A, 12A, 669 (1982)

[5] Grugel RN, Kim S, Advances in Space Research, 13, 225 (1993)

[6] Carlberg T, Fredriksson H, Metall. Trans. A, 11A, 1665 (1980)

[7] Grugel RN, Metall. Trans. B, 22B, 339 (1991)

[8] Grugel RN, Nourbakhsh S, AIAA paper(92-0352) (1992)

[9] Grugel RN, U.S. Patent No. 5246508, (1993). (1993)

[10] Wood RW, Loomis AL, Phill. Mag., 7, 417 (1927)

[11] Richards WT, J. Amer. Chem. Soc., 51, 1724 (1929)

[12] Sollner K, et al., Trans. Faraday Soc., 31, 835 (1935)

[13] Lane DH, Tiller WA, Trans. Amer. Foundryman's Soc., 65, 578 (1957)

[14] Lane DH, Tiller WA, Trans. AIME, 218, 991 (1960)

[15] Weinstein M, Trans. AIME, 230, 321 (1964)

[16] Bates HE, Weinstein M, J. Electrochem. Soc., 112, 693 (1965)

[17] Bailey JA, Davila JR, J. Inst. Metals., 97, 248 (1969)

[18] Hayakawa Y, Sone Y, Tatsumi K, Mumagawa M, Japan J. Appl. Phys., 21, 1273 (1982)

[19] Clancy PF, Heide W, ESA SP-219, 73 (1984)

[20] Takahashi T, Kamio A, Tezuka H, Kumai S, J. Japan Inst. LIght Metals, 34, 479 (1984)