High temperature behavior of metal matrix composites. Final report, 15 July 1992-29 February 1996

Technical Report · Tue May 28 04:00:00 EDT 1996

OSTI ID:402088

Taya, M; Lee, J K; Dunn, M L; Walker, G; Mori, T

When a metal matrix composite(MMC) is subjected to combined creep and thermal cycling loading, dimensional change is known to occur. This project is aimed at elucidating the mechanisms of a MMC subjected to creep/thermal cycling both experimentally and theoretically. The target MMCs is SiC particulate/Al matrix composite. The experimental results of dimensional change of SiCp/Al composite indicates that larger the maximum temperature(Tmax), and larger creep applied stress, the larger dimensional change is observed. The analytical model based on dislocation punching can explain the experimental results well. Thermal cycling of SCS6 fiber/Ti-alloy matrix composite was also conducted and the mechanical properties of as-cycled composite were assessed. The minor degradation of the as-cycled composite was observed only under the condition that Tmax is equal to or higher than 600C. Analytical modeling of relaxation of CTE mismatch strain that exists at the metal-ceramic interface was also developed by using variational principle and Eshelby`s method. Complete relaxation can be found by minimizing the total potential energy. As a example, a complete relaxation of a creeping MMC is that the Von-Mises stress in the metal matrix becomes zero, i.e., hydrostatic state of stress.

• Research Organization: Washington Univ., Seattle, WA (United States). Dept. of Mechanical Engineering
• OSTI ID: 402088
• Report Number(s): AD-A--311169/7/XAB; CNN: Contract F49620-93-1-0087
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CERAMICS
COMPOSITE MATERIALS
CREEP
MATHEMATICAL MODELS
MATRIX MATERIALS
PROGRESS REPORT
SILICON CARBIDES
STRESSES
TEMPERATURE RANGE 0400-1000 K
THERMODYNAMIC PROPERTIES
TITANIUM ALLOYS