Metal Matrix Composites and Physical Properties - ICCM

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Proceedings of ICCM–11, Gold Coast, Australia, 14th-18th July 1997 REFERENCES 1. R.K. Everett and R.J. Arsenault, Metal Matrix Composites: Processing and Interface, Academic Press Ltd, San Diego, 1991. 2. H. Nakata, T.Choh and N. Kanetake, "Fabrication and mechanical properties of in situ TiCp/Al composites by the interfacial reaction between SiCp and liquid Al-Ti alloy", J. Japan Inst. Light Metals, Vol.43, No.3, 1993, pp. 152-158 3. H. Nakata, T.Choh and N. Kanetake, "Development of Spontaneous Infiltration-in situ Production Process for Fabrication of Particulate Reinforced Aluminum Composites", J. Japan Inst. Metals, Vol.58, No.7, 1994, pp.803-809 4. I. Tuchitori and H. Fukunaga, "Reaction Hardening of Particulate Titanium Dioxide (rutile)/ Aluminum Composites by Heat-Treatment", J. Japan. Inst. Metals, Vol.58, No.9, 1994, pp.1029-1035 5. I. Tuchitori and H.Fukunaga, "Process Control by Reaction Squeeze Casting for Intermetallic-strengthening of TiO 2 /AL Composite", Proc. of ICCM9, Vol.2, 1993, pp. 906-912 6. I. Tuchitori, N. Morinaga and H. Fukunaga, "Effects of Mg and Si on Reaction Hardening of Particulate Titanium Dioxide (Rutile)/ Aluminum Composites", J Japan Inst. Metals, Vol.59, No.3, 1995, pp. 331-338 III - 31
Volume III: Metal Matrix Composites and Physical Properties THE INTERPRETATION OF X-RAY STRESS MEASUREMENTS OF METAL MATRIX COMPOSITES USING COMPUTER MODELLING TECHNIQUES M.R.Watts and P.J.Withers Department of Materials Science and Metallurgy, University of Cambridge, Pembroke Street, Cambridge, CB2 3QZ, United Kingdom. SUMMARY: In this paper the interpretation of X-ray measurements of stress based on the conventional sin 2 ψ method is examined for metal matrix composites. While the biaxial assumption may be valid for macrostress distributions, its range of validity for materials such as composites which contain microstresses is not so clear. A finite element model has been constructed to simulate the relaxation of an internal thermal microstress distribution near the free surface. Analytical modelling has then been used to simulate the stress distribution, on the basis of which sin 2 ψ plots have been produced. This work suggests that the biaxial stress assumption is valid over a shorter region than previously thought and that this has serious implications for the interpretation of X-ray measurements made on composites. These implications are examined for an Al/SiC metal matrix particulate composite system. KEYWORDS: residual stresses, metal matrix composites, x-rays, finite element modelling, internal stresses, thermal stresses INTRODUCTION The fact that the normal stress across a free surface must be zero has long been exploited for the interpretation of X-ray stress measurements using the sin 2 ψ method [1-3] . Of course this assumption is only strictly true at the surface, but since the penetration of X-ray radiation within metallic materials is limited to depths of only tens of microns, in many cases it is a fair assumption for the whole of the sampling volume. While this assumption may well have merit for single phase materials, the situation is not so clear for composites, which often contain microstresses between the phases, arising for example, from differences in thermal expansion coefficient, or from plastic deformation of the matrix phase. Previously, Nishioka et al. and Hanabusa et al. [4,5] attempted to calculate the rate at which the internal stresses fall off as the free surface is approached for a regular array of second phase particles. In this paper we use finite element modelling techniques to examine the rate of decay of the stress state near-surface for a randomly distributed reinforcing phase. When the penetration depth is significantly less than the particle spacing a steep gradient is predicted indicative of a biaxial stress and when the penetration is greater than the particle III - 32
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Metal Matrix Composites and Physical Properties - ICCM

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