Sage Journals: Discover world-class research

Abstract

Mechanical properties of the SiCw/Al composite degraded by thermal cycling were examined using tensile tests and hardness measurements. Thermally cycled (TC) SiCw/Al was prepared through 100 thermal cycles between 200 and 300 C. Some of SiCw/Al were isothermally exposed (IE) at 300 C for 80 h for comparison. Fracture surface observation revealed the difference in fracture mechanism between the TC- and IE-SiCw/Al composites. Reduction of tensile strengths was greater in the TC-SiCw/Al than in the IE-SiCw/Al. The large reduction in the TC-SiCw/Al was caused by pulled-out whiskers, which was observed frequently in the fracture surfaces. While broken whiskers were observed markedly, indicating that whiskers of the IE-SiCw/Al carried external stress fully. The experimental results were verified theoretically using a shear-lag model for discontinuous fiber reinforced composites. Good agreement was found between experimental results and theoretical calculations.

Get full access to this article

View all access options for this article.

References

1. Papazian, J.M. (1988). Metall. Trans., A19: 2945-2953 .

2. Ruffles, C. (1993). ICCM/9, 123-130.

3. Köhler, C. and Kainer, K.U. (1993). ICCM/9, 347-354.

4. Strangwood, M., Hippsley, C.A. and Lewandowski, J.J. (1993). ICCM/9, 1483-1487.

5. Papazian, J.M. and Adler, P.N. (1990). Metall. Trans., A21: 401-410 .

6. Dutta, I. and Bourell, D.L. (1990). Acta Metal. Mater., 38(11): 2041-2049 .

7. Badini, C., Marino, F. and Tomasi, A. (1991). J. of Mater. Sci., 26: 6279-6287 .

8. Colclough, A., Dempster, B., Favry, Y. and Valentin, D. (1991). Mater Sci. and Eng., A135: 203-207 .

9. Borrego, A. and González-Doncel, G. (1998). Mater. Sci. and Eng., A245: 10-18 .

10.

10. Wu, S.Q., Wei, Z.S. and Tjong, S.C. (2000). Compo. Sci. and Tech., 60: 2873-2880 .

11.

11. Ahn, J.J. and Ochiai, S. (2002). J. of Compo. Mater., 36(17): 2073-2083 .

12.

12. Dutta, I., Allen, S.M. and Hafley, J.L. (1991). Metall. Trans., A22: 2553-2563 .

13.

13. The Society of Materials Science Japan (1999). Mechanical Material (in Japanese), The Society of Materials Science, Japan .

14.

14. Kelly, A. and Macmillan, N.H. (1986). Strong Solids - Chapter 6, Oxford Science Publications .

15.

15. Ochiai, S. and Hojo, M. (1986). J. of Mater. Sci., 29: 2754-2760 .

Mechanical Properties of SiCw/Al Composite Degraded by Thermal Cycling

Abstract

Get full access to this article

References