Hostname: page-component-cd9895bd7-q99xh Total loading time: 0 Render date: 2024-12-29T13:46:20.622Z Has data issue: false hasContentIssue false
  • English
  • Français

Residual stresses in a SiC whisker-reinforced alumina composite by high-temperature X-ray diffraction

Published online by Cambridge University Press:  10 January 2013

Benjamin L. Ballard ,
Paul K. Predecki  and
Camden R. Hubbard
Benjamin L. Ballard
Affiliation:
University of Denver, Engineering Department, Denver, Colorado 80210
Paul K. Predecki
Affiliation:
University of Denver, Engineering Department, Denver, Colorado 80210
Camden R. Hubbard
Affiliation:
HTML, Oak National Laboratory, Oak Ridge, Tennessee 37831
Get access Rights & Permissions [Opens in a new window]

Abstract

Residual strains and microstresses are evaluated for both phase of a hot-pressed, fine-grained α-alumina reinforced with 25 wt% (29 vol%) single-crystal silicon carbide whiskers at temperatures from 25 to 1000 °C. The sample was maintained in a nonoxidizing environment while measurements of the interplaner spacing of alumina (146) and SiC (511 + 333) were made using X-ray diffraction methods. The residual strains were profiled at temperature increments of 250 °C from which the corresponding microstresses were calculated. Linear extrapolation of the SiC ε33 profile indicates that the strains are completely relaxed at a temperature of approximately 1470 °C. These residual stress relaxation results suggest that elevated temperature toughness and fracture strength of this composite may result from cooperative mechanisms.

Keywords

residual stressstrainalumina/silicon carbide compositetemperatureX-ray diffraction
Type
Research Article
Information
Powder Diffraction , Volume 9 , Issue 1 , March 1994 , pp. 50 - 53
Copyright
Copyright © Cambridge University Press 1994

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

1Becher, P. F. and Wei, G. C., “Toughening Behavior in SiC-Whisker Reinforced Alumina,” J. Am. Ceram. Soc. 67 (12), C267–C269 (1984).CrossRefGoogle Scholar
2Becher, P. F., Hsueh, C. H., Angelini, P., and Tiegs, T. N., “Toughening Behavior in Whisker-Reinforced Ceramic Matrix Composites,” J. Am. Ceram. Soc. 68 (5), 225–231 (1985).Google Scholar
3Jenkins, M. G., Kobayashi, A. S., White, K. W., and Bradt, R. C., “Crack Initiation and Arrest in a SiC Whisker/Al2O3 Matrix Composites,” J. Am. Ceram. Soc. 70 (6), 393–395 (1987).Google Scholar
4Gac, F. D., “It there Anything of Practical Value Hidden Amongst the Composite Toughening Theories?!—A Jim Mueller Perspective,” Ceram. Eng. Sci. Proc. 11 (7)–(8), 551–570 (1990).Google Scholar
5Hsueh, C. H., “Evaluation of Interfacial Shear Strength, Residual Clamping Stress and Coefficient of Friction for Fiber-Reinforced Ceramic Composites,” Acta Metall. Mater. 38 (3), 403–409 (1990).CrossRefGoogle Scholar
6Becher, P. F. and Tiegs, T. N., “Temperature Dependence of Strengthening by Whisker Reinforcement: SiC-Whisker Reinforced Alumina in Air,” Adv. Ceram. Mater. 3 (2), 148–153 (1988).Google Scholar
7Majumdar, S., Kupperman, D. and Singh, J., “Determination of Residual Thermal Stresses in a SiC-Al2O3 Composite Using Neutron Diffraction,” J. Am. Ceram. Soc. 71 (10), 858–863 (1988).Google Scholar
8Majumdar, S. and Kupperman, D., “Effect of Temperature and Whisker Volume Fraction on Average Residual Thermal Strains in a SiC/Al2O3 Composite,” J. Am. Ceram. Soc. 72 (2), 312–313 (1989).Google Scholar
9Abuhasan, A., Balasingh, C., and Predecki, P., “Residual Stresses in Alumina/Silicon Carbide (Whisker) Composites by X-Ray Diffraction,” J. Am. Ceram. Soc. 73 (8) 2474–2484 (1990).Google Scholar
10Ballard, B. L., Predecki, P. K., and Hubbard, C. R., “Residual Strains in Al2O3/SiC (Whisker) Composite from 25–1000 °C,” Adv. X-ray Anal. 34, 465–471 (1991).Google Scholar
11Predecki, P. K., Abuhasan, A., and Barrett, C. S., “X-Ray Elastic Constants for β-SiC Whiskers and Anisotropy in Al2O3/SiC (whisker) Composites,” Adv. X-Ray Anal. 34, 643–650 (1991).Google Scholar
12Bar-Ziv, S. and Brandon, D. G., “Residual Microstrains in Whisker-Reinforced Alumina,” Ceram. Eng. Sci. Pro. 9 (7)–(8), 777–794 (1988).Google Scholar
13Predecki, P. K., Abuhasan, A., and Barrett, C. S., “Residual Stresses Determination in Al2O3/SiC (Whisker) Composites by X-ray Diffraction,” Adv. X-ray Anal. 31, 231–243 (1988).Google Scholar
14Nutt, S. R., “Defects in Silicon Carbide Whiskers,” J. Ceram. Soc. 67 (6), 428–431 (1984).Google Scholar
15Touloukian, Y. S. et al. Therrmophysical Properties ofMatter-The TPRC Data Series—Vol. 13 Thermal Expansion-Nonmetallic Solids (Plenum, New York, 1977), p. 154.Google Scholar
16Kurita, M., Ihara, I., and Saito, A., “Diffraction Plane Dependence of X-Ray Elastic Constants of Alumina,” Adv. X-Ray Anal. 33, 363–372 (1990).Google Scholar
17Soga, N. and Anderson, O. L., “High temperature Elastic Properties of Polycrystalline MgO and Al2O3,” J. Am. Ceram. Soc. 49 (7) 355–359 (1966).Google Scholar
18Noyan, I. C. and Cohen, J. B., Residual Stress: Measurement by Diffraction and Interpretation (Springer-Verlag, New York, 1987), p. 55.Google Scholar