A.R. de arellano-Lopez et al nternatonal Journal of Refractory Metals& Hard Matenals 16(1998)337-341 341 a stress exponent of s 1 and an activation energy of 6 Smith V, Deckman B, Brueck D. Am Ceram Soc Bull ≈470kJ/mol 1994:73(12)49. [7 Schuldes JJ EDM Today 1992, Nov/ Dec 16 [8 Smirnov BI, Nikolaev VI, Burenkov YuA, Routbort JL, Goretta KC J Tech Phys Lett 1997, 23.923 Acknowledgements L Schuldes丁 Ceram Eng sci proc 1997. 18 239 This work was supported by the North Atlantic Arellano-Lopez AR, Coretta KC, Singh D. T TECHNOLOGY CRG/NO. 960793: the Ministerio de [11] de Arellano-Lopez AR, Smirnov Bl, Goretta KC. Routbort JL. Mater Sci en Educacion y Ciencias of Spain, under CICYT Project [12] Routbort JL Acta Metall 1982, 30.663 MAT97-0562-C02-01; and the U.S. Department of [13] McSkimin HJ In. Mason WP, edtor Physical acoustics, vol 1, Energy, Energy Research Laboratory Technology art A New York Academic Press, 1964. 271 Transfer Program, under Contract W-31-109-Eng-38 [14] GervaIs H, Pellisier B, Castaing J Rev Int Hautes Temp fract1978,1543 115 Fukuhara M, Yamauchi I J Mater Sci 1993; 28: 4681 [16 Lee M, Borom MT Adv Ceram Mater 1988, 3: 38 References [17] Cannon WR, Langdon TG. J Mater Sci 1988: 23 1 [18] Frost HJ, Ashby MF Deformation mechanIsm maps. New York Pergamon Press, 1982 [1 Evans AG, Marshall DB Acta Metall 1989,37 2567 [19 de arellano-Lopez AR, Dominguez-Rodriguez A, Go [2 Lin H-T, Becher PF J Am Ceram Soc 1990: 73 1378 Routbort JL In Bradt RC. Brookes CA, Routbort 3 Singh JP, Coretta KC, Routbort JL, Kupperman DS, Rhodes Plastic deformation of ceramics New York: Plenum Pr JF Adv ceram Mater 1988,3 357. [4] Fisher ES, ManghnanI MH, Wang J-F, Routbort JL J Am [20] de Arellano-Lopez AR, Cumbrera FL, Dominguez-Rodriguez Ceram Soc 1992, 75 908. A, Coretta KC, Routbort JL J Am Ceram Soc 1993, 73 1297 5 de Arellano-Lopez AR, Dominguez-Rodriguez A, Goretta KC, [21 Calderon-Moreno JM. de Arellano-LOpez AR, Dominguez Routbort jl j Am Ceram Soc 1993: 76 1425 Rodriguez A, Routbort JL Mater Sci Eng 1996; A209 111A. R. de Arellano-L6pez et al./Intemattonal Journal of Refiactory Metals& Hard Matenals 16 (1998) 337-341 341 a stress exponent of ~ 1 and an activation energy of 470 kJ/mol. Acknowledgements This work was supported by the North Atlantic Treaty Organization, under Grant HIGH TECHNOLOGY CRG/No. 960793; the Ministerio de Educaci6n y Ciencias of Spain, under CICYT Project MAT97-0562-C02-01; and the U.S. Department of Energy, Energy Research Laboratory Technology Transfer Program, under Contract W-31-109-Eng-38. References [1] Evans AG, Marshall DB Acta Metall 1989,37 2567 [2] Lin H-T, Becher PF J Am Ceram Soc 1990;73 1378 [3] Slngh JP, Goretta KC, Routbort JL, Kupperman DS, Rhodes JF Adv Ceram Mater 1988,3 357. [4] Fisher ES, Manghnanl MH, Wang J-F, Routbort JL J Am Ceram Soc 1992;75 908. [5] de Arellano-L6pez AR, Dominguez-Rodriguez A, Goretta KC, Routbort JL J Am Ceram Soc 1993;76'1425 [6] Smith V, Deckman B, Brueck D. Am Ceram Soc Bull 1994;73(12) 49. [7] Schuldles JJ EDM Today 1992,Nov/Dec 16 [8] Smlrnov BI, Nikolaev VI, Burenkov YuA, Routbort JL, Goretta KC J Tech Phys Lett 1997,23.923. [9] J1ang M. Goretta KC, Singh D, Routbort JL, Schuldles JJ Ceram Eng Scl Proc 1997,18 239. [10] Smlrnov BI, Nikolaev VI, Orlova TS, Shpelzman VV, de Arellano-L6pez AR, Goretta KC, Smgh D, Routbort JL. Mater Scl Eng A, in press. [11] de Arellano-L6pez AR, Smirnov BI, Goretta KC, Routbort JL. Mater Sci Eng A, in press [12] Routbort JL Acta Metall 1982,30.663. [13] McSkimin HJ In. Mason WP, editor Physical acoustics, vol 1, part A New York' Academic Press, 1964'271 [14] Gervals H, Pelhsier B, Castaing J Rev Int Hautes Temp Refract 1978,15 43 [15] Fukuhara M, Yamauchi I. J Mater Scl 1993;28:4681. [16] Lee M, Borom MT. Adv Ceram Mater 1988,3:38 [17] Cannon WR, Langdon TG. J Mater Scl 1988;23 1 [18] Frost HJ, Ashby MF Deformation mechanism maps. New York Pergamon Press, 1982. [19] de Arellano-L6pez AR, Dominguez-Rodrfguez A, Goretta KC, Routbort JL. In. Bradt RC, Brookes CA, Routbort JL, edRors. Plastic deformation of ceramics New York: Plenum Press, 1995, p 533 [20] de Arellano-L6pez AR, Cumbrera FL, Domlnguez-Rodriguez A, Goretta KC, Routbort JL J Am Ceram Soc 1993,73 1297 [21] Calderon-Moreno JM, de Arellano-L6pez AR, Dominguez￾Rodrfguez A, Routbort JL Mater Sca Eng 1996;A209'111