High-temperature mechanical properties of SiC whisker reinforced Al sub 2 O sub 3 composites

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High-temperature constant strain rate compressive tests have been performed on Al{sub 2}O{sub 3} reinforced with different concentrations of SiC whiskers. The samples were obtained from three sources, but contained whiskers from the same source. The temperature range was from 1300 to 1500{degree}C and experiments were conducted in air and argon. Strain rates varied from 3 {times} 10{sup {minus}8} to 5 {times} 10{sup {minus}5} s{sup {minus}1} with stresses between 3 and 500 MPa. Stress exponents were fond to vary between 1 and 5 and depended on microstructure, whisker concentration and stress, indicating a change in the mechanism controlling plastic deformation. Change ... continued below

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DeArellano-Lopez, A.R.; Dominguez-Rodriguez, A. (Seville Univ. (Spain). Dept. Materia Condensada); Goretta, K.C. & Routbort, J.L. (Argonne National Lab., IL (USA)) January 1, 1990.

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High-temperature constant strain rate compressive tests have been performed on Al{sub 2}O{sub 3} reinforced with different concentrations of SiC whiskers. The samples were obtained from three sources, but contained whiskers from the same source. The temperature range was from 1300 to 1500{degree}C and experiments were conducted in air and argon. Strain rates varied from 3 {times} 10{sup {minus}8} to 5 {times} 10{sup {minus}5} s{sup {minus}1} with stresses between 3 and 500 MPa. Stress exponents were fond to vary between 1 and 5 and depended on microstructure, whisker concentration and stress, indicating a change in the mechanism controlling plastic deformation. Change from diffusional creep to a damage accumulation mechanism was supported by TEM observations on samples as-received and deformed both in the n = 1 regime and in the n = 5 regime. Degradation of SiC whiskers occurred when testing in air. 12 refs., 1 tab., 7 figs.

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Pages: (10 p)

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NTIS, PC A02/MF A01 - OSTI; GPO Dep.

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  • First European East-West conference on materials and processes, Helsinki (Finland), 11-16 Jun 1990

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  • Other: DE91004424
  • Report No.: CONF-900655-1
  • Grant Number: W-31109-ENG-38
  • Office of Scientific & Technical Information Report Number: 6384191
  • Archival Resource Key: ark:/67531/metadc1203734

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  • January 1, 1990

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  • July 5, 2018, 11:11 p.m.

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  • Nov. 29, 2018, 12:29 p.m.

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DeArellano-Lopez, A.R.; Dominguez-Rodriguez, A. (Seville Univ. (Spain). Dept. Materia Condensada); Goretta, K.C. & Routbort, J.L. (Argonne National Lab., IL (USA)). High-temperature mechanical properties of SiC whisker reinforced Al sub 2 O sub 3 composites, article, January 1, 1990; Illinois. (digital.library.unt.edu/ark:/67531/metadc1203734/: accessed December 12, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.