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Residual stress and microcracking in SiC-MgO composites

✍ Scribed by J. Luo; R. Stevens

Publisher
Elsevier Science
Year
1993
Tongue
English
Weight
946 KB
Volume
12
Category
Article
ISSN
0955-2219

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✦ Synopsis

The level o/residual stress in SiC-particle-reinforced MgO composites has been investigated using X-ray d(f/i'action. The significant dfference in thermal expansion cot~'eients between SiC and MgO has resulted in the high residual stress in the composites. The stress measured has been compared with the calculated value evaluated using a Modified Eshelby's Model. Good agreement was obtained at low volume ji'aetions ~?[ SiC addition to the MgO. At high volume Ji'actions r~[ SiC (>25%) a significant dfff'erence bet ~een measured and ealeula ted values was obtained. This deviation has been shown to arise as a consequence of mieroeracking, which developed in the composites to release high levels of residual stress. The microcracking postulated as the strah~ reli~/'mechanism was observed using TEM and SEM.

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