1. S. V. Nair, J. K. Tien andR. O. Bates,Int. Met. Rev. 30 (1985) 275.
2. T. G. Nieh andR. F. Karlak,J. Mater. Sci. Lett. 2 (1983) 119.
3. D. L. McDanels,Met. Trans. 16A (1985) 1105.
4. Y. Fujita, H. Fukumoto andY. Kurita,ICCM andECCM,2 (1987) 2.340.
5. T. Christman andS. Suresh, Brown University Report # NSF-ENG-8451092, 1987.