Abstract

pp. 1263-74. 11. S.H. Suh, J.B. Cohen, and J. Weertman: Metall. Trans. A, 1983, vol. 14A, pp. 117-26. 12. S. Karashima, T. likubo, T. Watanabe, and H. Oikawa: Trans. Japan Inst. Metals, 1971, vol. 12, pp. 369-74. 13. C.G. Schmidt, C.M. Young, B. Walser, R.H. Klundt, and O.D. Sherby: Metall. Trans. A, 1982, vol. 13A, pp. 447-56. 14. H. Nahm, J. Moteff, and D. R. Diercks: Acta Metall., 1977, vol. 25, pp, 107-16. 15. J.L. Robbins: Engineer Thesis, Stanford University, Stanford, CA, 1964. 16. M.E. Kassner, A.K. Miller, and O.D. Sherby: Metall. Trans. A, 1982, vol. 13A, pp. 1977-86. 17. M.E. Kassner, A.A. Ziaai-Moayyed, and A.K. Miller: Metall. Trans. A, 1985, vol. 16A, pp. 1069-76. 18. M.E. Kassner and J.W. Elmer: Strength of Metals and Alloys, Pergamon Press, Oxford, 1985, pp. 953-58. 19. D. Calliard and J. L. Martin: ActaMetall., 1982, vol. 30, pp. 791-98. 20. E. Weckert and W. Blum: Strength of Metals and Alloys, Pergamon Press, Oxford, 1985, pp. 773-78. 21. S.K. Mitra and D. McLean: Metal Sci. J., 1967, vol. l, pp. 192-98. 22. P. Ostrrm and R. Lagneborg: Res Mechanica, 1980, vol. 1, pp. 59-79. 23. B. Burton: Phil. Mag., 1982, vol. 45A, pp. 657-75. 24. A.J. Ardell and M.A. Przystupa: Mech. Mat., 1984, vol. 3, pp. 319-32. and 25 pct, respectively. A typical microstructure of the controlled rolled materials is shown in Figure l(a). Grain size of the controlled rolled materials was about ASTM 11. In the determination of the effect of A1 content on the tensile ductilities of the alloys, the controlled rolled materials were subjected to a recrystallization heat treatment of 850 ~ for 1 hour. Figure l(b) shows an optical microstructure of the recrystallized alloy (5AI). The grain size of the recrystallized material was similar to that of the controlled rolled material. Tensile tests were performed at RT, 4 0 ~ -100 ~ and -196 ~ Figure 2 shows yield stresses v s test temperatures as a function of aluminum content for the controlled materials. The yield strength of the 5AI alloy at -196 ~ was 1022 MPa, while that of the Al-free alloy (0A1) was 810 MPa at 196 ~ The addition of 5 wt pct AI to the M-free alloy (0A1) produced about 25 pct increase in the yield strength in the controlled rolled state. It is also noted that the yield strength of this controlled rolled alloy, 1022 MPa at 196 ~ in this work was about 10 pct higher than that of the same alloy reported in our previous study, l The increase of the yield strength in this work is most likely

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