기계적 합금화 Iron Silicide의 열간성형 및 열처리에 의한 상변화

어순철; 김일호; 황승준; 조경원; 최재하; Soon-Chul Ur; Il-Ho Kim; Seung-Joon Hwang; Kyung-Won Cho; Jae-Ha Choi

Korean Journal of Materials Research, Vol.11, No.12, 1068-1073, December, 2001

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기계적 합금화 Iron Silicide의 열간성형 및 열처리에 의한 상변화

Phase Transformation During Hot Consolidation and Heat Treatments in Mechanically Alloyed Iron Silicide

어순철 ^†, 김일호 , 황승준¹, 조경원², 최재하²

충주대학교 재료공학과/나노기술연구소
¹대진대학교 신소재공학과
²충북대학교 재료공학과

Soon-Chul Ur^†, Il-Ho Kim , Seung-Joon Hwang¹, Kyung-Won Cho², and Jae-Ha Choi²

Department of Materials Science and Engineering/NT Lab., Chungju National University, Chungbuk 380-702, Korea
¹Department of Advanced Materials Science and Engineering, Dajin University, Pocheon, Gyunggi, 487-711, Korea
²Depatment of Materials Engineering, Chungbuk National University, Chungbuk 391-763, Korea

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An n-type iron silicide(Fe 0.98 Co 0.02 Si 2 ) has been produced by mechanical alloying process and consolidated by vacuum hot pressing. Although as-milled powders after 120 hours of milling did not show an alloying progress, β?FeSi 2 phase transformation was induced by isothermal annealing at 830?C for 1 hour, and the fully transformed β?FeSi 2 phase was obtained after 4 hours of annealing. Near fully dense specimen was obtained after vacuum hot pressing at 1100?C with a stress of 60MPa. However, as-consolidated iron silicides were consisted of untransformed mixture of \Alpha?Fe 2 Si 5 and {\varepsilon-FeSi phases. Thus, isothermal annealing has been carried out to induce the transformation to a thermoelectric semiconducting β?FeSi 2 phase. The condition for β?FeSi 2 transformation was investigated by utilizing DTA, SEM, and XRD analysis. The phase transformation was shown to be taken place by a vacuum isothermal annealing at 830?C and the transformation behaviour was investigated as a function of annealing time. The mechanical properties of β?FeSi 2 materials before and after isothermal annealing were characterized in this study.

Keywords:Iron silicide;mechanical alloying;vacuum hot pressing;thermoelectric;isothermal annealing;β -FeSi 2

[References]

Ware RM, McNeil DJ, Proc. IEE, 111(1), 178 (1964)
Birkholz U, Scheim J, Fiz. Stst. Sol, 27, 413 (1968)
Dusausay PY, Protas J, Wandi R, Roques B, Acta Crystal. B, 27, 209 (1971)
Tokita S, Amano T, Okabayashi M, Nishida IA, Proc. 12th Int'l Conf. of Thermoelectrics, Nov. 9-11, Yokohama, Japan, 197 (1993) (1993)
Isoda I, Shinohara Y, Imai Y, Nishida IA, Ohashi O, Proc. 17th Int'l Conf. on Thermoelectrics, May 24-28, Nagoya, Japan, 390 (1998) (1998)
Yamauchi I, Ohnaka I, Uyema S, Proc. 12th Int'l Conf. on Thermoelectrics, Nov. 9-11, Yokohama, Japan, 289 (1993) (1993)
Shiga S, Fujimoto K, Umemoto M, Proc. 12th Int'l Conf. on Thermoelectrics, Nov. 9-11, Yokohama, Japan, 311 (1993) (1993)
Nishida I, Phy. Rev. B, 7, 2710 (1971)
Birkholtz U, Schelm J, Phy. Stat. Sol., 27, 413 (1968)
Benjamin JS, Met. Trans, 1, 1943 (1970)
Rowe DM, Schuka VS, J. Appl. Phys., 52, 7421 (1981)
Ur SC, Nash P, Higgins GT, Scripta Materialia, 34, 53 (1996)
Hwang SJ, Nash P, Dollar M, Dymek S, Mater. Sci. Forum, 88-90, 611 (1990)
Uemoto M, Mater. Trans., 36, 373 (1995)
Raynor GV, Girlin VG, 'Phase equilibria in iron ternary alloy', Institutes of Metals, 47 (1988) (1988)
Kojima T, Okamoto M, Nishida I, Proc. 5th Int'l Conf. of Thermoelectric Energy Conversion, 5 (1984) (1984)
Nishida I, Phys. Rev. B, 7, 2710 (1973)
Sakata T, Sakai Y, Yoshino H, Fujii H, Nishida I, J. Less Common Metals, 61, 301 (1978)
Ur SC, Kim IH, J. of KMRS, 11, 132 (2001)

[Referenced By]

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[1] Ware RM, McNeil DJ, Proc. IEE, 111(1), 178 (1964)

[2] Birkholz U, Scheim J, Fiz. Stst. Sol, 27, 413 (1968)

[3] Dusausay PY, Protas J, Wandi R, Roques B, Acta Crystal. B, 27, 209 (1971)

[4] Tokita S, Amano T, Okabayashi M, Nishida IA, Proc. 12th Int'l Conf. of Thermoelectrics, Nov. 9-11, Yokohama, Japan, 197 (1993) (1993)

[5] Isoda I, Shinohara Y, Imai Y, Nishida IA, Ohashi O, Proc. 17th Int'l Conf. on Thermoelectrics, May 24-28, Nagoya, Japan, 390 (1998) (1998)

[6] Yamauchi I, Ohnaka I, Uyema S, Proc. 12th Int'l Conf. on Thermoelectrics, Nov. 9-11, Yokohama, Japan, 289 (1993) (1993)

[7] Shiga S, Fujimoto K, Umemoto M, Proc. 12th Int'l Conf. on Thermoelectrics, Nov. 9-11, Yokohama, Japan, 311 (1993) (1993)

[8] Nishida I, Phy. Rev. B, 7, 2710 (1971)

[9] Birkholtz U, Schelm J, Phy. Stat. Sol., 27, 413 (1968)

[10] Benjamin JS, Met. Trans, 1, 1943 (1970)

[11] Rowe DM, Schuka VS, J. Appl. Phys., 52, 7421 (1981)

[12] Ur SC, Nash P, Higgins GT, Scripta Materialia, 34, 53 (1996)

[13] Hwang SJ, Nash P, Dollar M, Dymek S, Mater. Sci. Forum, 88-90, 611 (1990)

[14] Uemoto M, Mater. Trans., 36, 373 (1995)

[15] Raynor GV, Girlin VG, 'Phase equilibria in iron ternary alloy', Institutes of Metals, 47 (1988) (1988)

[16] Kojima T, Okamoto M, Nishida I, Proc. 5th Int'l Conf. of Thermoelectric Energy Conversion, 5 (1984) (1984)

[17] Nishida I, Phys. Rev. B, 7, 2710 (1973)

[18] Sakata T, Sakai Y, Yoshino H, Fujii H, Nishida I, J. Less Common Metals, 61, 301 (1978)

[19] Ur SC, Kim IH, J. of KMRS, 11, 132 (2001)