𝔖 Bobbio Scriptorium
✦   LIBER   ✦

Creep deformation of alumina-SiC composites

✍ Scribed by S.R. Nutt; P. Lipetzky; P.F. Becher

Publisher
Elsevier Science
Year
1990
Tongue
English
Weight
984 KB
Volume
126
Category
Article
ISSN
0921-5093

No coin nor oath required. For personal study only.

✦ Synopsis

Composites of alumina reinforced with SiC whiskers have been creep tested in bending and in compression at 1200-1400 °C in an air ambient. The flexural creep data follow a power law constitutive relation with two distinct stress exponents that depend on the level of applied stress. Crept specimens were examined by transmission electron microscopy to determine the mechanisms of creep deformation and microstructural damage. The primary mechanism of creep deformation under these conditions is grain boundary and interface sliding resulting from diffusion. At high stress levels, the sliding is often unaccommodated, resulting in cavitation at grain boundary-interface junctions. Cavitation is associated with an increase in the stress exponent for flexural creep.

📜 SIMILAR VOLUMES

Creep damage in SiC/SiC composites
Creep damage in SiC/SiC composites
✍ A.G. Evans; C. Weber 📂 Article 📅 1996 🏛 Elsevier Science 🌐 English ⚖ 431 KB

In SiC/SiC composites, the matrix has greater creep resistance than the fibers. The consequent fiber deformation has been shown to transfer sufficient stress onto the matrix that, above a threshold, matrix cracks propagate across the 0 ° plies. This process increases the compliance of the composite

Creep mechanisms of laminated alumina/zi
Creep mechanisms of laminated alumina/zirconia-toughened alumina composites
✍ A. Morales-Rodríguez; A. Domínguez-Rodríguez; G. de Portu; M. Jiménez-Melendo 📂 Article 📅 2009 🏛 Elsevier Science 🌐 English ⚖ 499 KB

High-temperature plastic deformation of laminar composites containing alternate layers of Al 2 O 3 and a mixture of 60 vol.% Al 2 O 3 + 40 vol.% 3 mol% Y 2 O 3 -stabilized tetragonal ZrO 2 (ZTA) produced by tape casting is investigated in isostrain compression testing at temperatures between 1400 an

High temperature creep behavior of SiC w
High temperature creep behavior of SiC whisker-reinforced AlFeVSi composite
✍ S.J. Zhu; L.M. Peng; Z.Y. Ma; J. Bi; F.G. Wang; Z.G. Wang 📂 Article 📅 1996 🏛 Elsevier Science 🌐 English ⚖ 470 KB

Compression creep behavior of the 8009 alloy and SIC/8009 composite has been investigated at the temperatures ranging from 573 to 723 K. The addition of SiC whiskers in the 8009 alloy decreases creep rates by two orders of magnitude. The stress and temperture dependence of creep rates of the composi