사파이어( α  - Al 2   O 3   ) 단결정에 있어 basal slip (0001)1/3 전위 Part I : 전위속도

윤석영; 이종영; Seog-Young Yoon; Jong-Young Lee

Korean Journal of Materials Research, Vol.11, No.3, 221-226, March, 2001

Export Citation

사파이어( α - Al 2 O 3 ) 단결정에 있어 basal slip (0001)1/3 전위 Part I : 전위속도

Basal slip (0001)1/3 dislocation in sapphire ( α - Al 2 O 3 ) single crystals Part I: Dislocation velocity

윤석영 , 이종영

부산대학교 생산기술연구소, 특별연구원

Seog-Young Yoon , and Jong-Young Lee

Special researcher, Research Institute of Industrial Technology, Pusan National University, 30, Changjeon-Dong, Keumjeong-gu, Pusan 609-735, Korea

초록

사파이어 ( α - Al 2 O 3 ) 단결정에 있어 basal slip (0001)1/3 의 전위속도를 4점 곡강도를 이용하여, 측정하였다. 이 곡강도는 온도 1200 ? C 에서 1400 ? C 그리고 응력은 90MPa, 120MPa, 160MPa에서 행하여졌다. 전위속도는 4 점굽힘 시편의 굽힘변위속도에 의해 구하여졌다. 얻어진 전위속도를 이용하여 전위속도의 온도 및 응력 의존성에 대해 검토하였다. 전위속도의 온도의존성을 이용하여 basal slip 전위속도를 위한 활성화에너지를 구하였으며, 그 값은 대략 2.2 ± 0.4eV이었다. 한편, 전위속도의 응력의존성을 나타내는 응력지수 m은 2.0 ± 0.2이었다.

The basal slip (0001)1/3 dislocation velocity in sapphire ( α - Al 2 O 3 ) single crystals was measured by four-point bending test. The bending experiment was carried out in the temperature range from 120 0 ? C to 1400 ? C at various engineering stresses 90MPa, 120MPa, and 150MPa. The velocity of such dislocations was estimated from the bending displacement rate of the four-point bend sample. The dependence of temperature and stress in dislocation velocity was investigated. The activation energy for dislocation velocity was determined to be about 2.2 ± 0.4eV. In addition, the stress exponent (m) describing the stress dependence of dislocation velocities was in the range of 2.0 ± 0.2.

Keywords:sapphire single crystals;basal slip;dislocation velocity

[References]

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Wachtman JB, Maxwell LH, J. Am. Ceram. Soc., 40, 377 (1957)
Scheupein R, Gibbs P, J. Am. Ceram. Soc., 43(9), 458 (1960)
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Kenway PR, Phil. Mag. B, 68(2), 171 (1993)
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[Related Articles]

[1] Kronberg ML, Acta Metall., 5(9), 507 (1957)

[2] Gooch DJ, Groves GW, Acta Metall., 55(2), 105 (1972)

[3] Wachtman JB, Maxwell LH, J. Am. Ceram. Soc., 40, 377 (1957)

[4] Scheupein R, Gibbs P, J. Am. Ceram. Soc., 43(9), 458 (1960)

[5] Snow JD, Heuer AH, J. Am. Ceram. Soc., 56(3), 153 (1973)

[6] Cadoz J, Castaing J, Phillips DS, Heuer AH, Acta Metall., 30, 2205 (1982)

[7] Pletka PJ, Mitchell TE, Heuer AH, J. Am. Ceram. Soc., 57(9), 388 (1974)

[8] Pletka BJ, Heuer AH, Mitchell TE, Acta Metall., 25, 25 (1977)

[9] Pletka BJ, Mitchell TE, Heuer AH, Acta Metall., 30, 147 (1982)

[10] Chang R, J. Appl. Phys., 31(3), 484 (1960)

[11] Hockey BJ, 'Deformation of ceramic materials', Edited by Bradt RC, Tressler RE. Plenum, New York, 1975 (1975)

[12] Chan HM, Lawn BR, J. Am. Ceram. Soc., 71(1), 29 (1988)

[13] Kollenberg W, J. Mater. Sci., 23 (1988)

[14] Farber BY, Yoon SY, Lagerlof KPD, Heuer AH, Zeitschr. fur Metallkunde, 26, 426 (1993)

[15] Farber BY, Yoon SY, Lagerlof KPD, Heuer AH, Phys. Stat. Sol. A(137), 485 (1993)

[16] Johnston WG, Gilman JJ, J. Appl. Phys., 30(2), 129 (1959)

[17] Nadgornyi E, 'Dislocation dynamics and mechanical properties of crystals', in Progress in Materials Science, (ed. Christian JW, Haasen P, Massalski TB), Permagon Press, (1988) (1988)

[18] Farber BY, Chiarelli AS, Heuer AH, Phil. Mag. A, 70(1), 201 (1994)

[19] Kim HS, Roberts S, J. Am. Ceram. Soc., 77(12), 3099 (1994)

[20] Howitt DG, Mitchell TE, Phil. Mag. A, 44(1), 229 (1981)

[21] Kenway PR, Phil. Mag. B, 68(2), 171 (1993)

[22] Timoshenko S, 'Theory of Elasticity', pp. 391 (McGrow-Hill) (1961) (1961)

[23] Hirth JP, Lothe J, 'Theory of Dislocations', pp. 679 (New York : McGraw-Hill) (1972) (1972)

[24] Smith CS, Guttman L, Trans. Amer. Inst. Mining, Met. Petrol. Eng. 197 (1953) (1953)

[25] Yoon SY, Lee JY, J. Korean Association of Crystal Growth, 10(4), 337 (2000)

[26] Lagerlof KPD, Heuer AH, Mitchell TE, J. Am. Ceram. Soc., 77(2), 385 (1994)