Abstract
The grain size dependence of the yield stress in hot rolled 99.87 pct magnesium sheets and rods was measured in the temperature range 77 K to 420 K. Hot rolling produced strong basal textures and, for a given grain size, the hot rolled material has a higher strength than extruded material. The yield strength-grain size relation in the above temperature range follows the Hall-Petch equation, and the temperature dependencies of the Hall-Petch constants σ0 and k are in support of the theory of Armstrong for hcp metals that the intercept σ0 is related to the critical resolved shear stress (CRSS) for basal slip (easy slip) and the slope k is related to the CRSS for prismatic slip (difficult slip) occurring near the grain boundaries. In the hot rolled magnesium, σ0 is larger and k is smaller than in extruded material, observations which are shown to result from strong unfavorable basal and favorable {1010} textures, respectively. Texture affects the Hall-Petch constants through its effect on the orientation factors relating them to the CRSS for the individual slip systems controlling them.
Similar content being viewed by others
References
R.W. Armstrong, I. Codd, R.M. Douthwaite, and N.J. Petch:Phil. Mag., 1962, vol. 7, p. 45.
Y. V. R. K. Prasad, N.M. Madhava, and R.W. Armstrong:Grain Boundaries in Engineering Materials, J. L. Walter, J. H. Westbrook, and D. A. Woodford, eds., Proc. 4th Bolton Landing Conference, Lake George, NY, Claitor’s Publishing Division, Baton Rouge, LA, 1974, p. 67.
N.R. Risebrough and E. Teghtsoonian:Canad. J. Phys., 1967, vol. 45, p. 591.
F. E. Hauser, P. R. Landon, and J. E. Dom:Trans. AIME, J. of Metals, May 1956, vol. 206, p. 589.
K. Okazaki and H. Conrad:Acta Met., 1973, vol. 21, p. 1117.
C. E. Coleman and D. Hardie:J. Inst. Metals, 1966, vol. 84, p. 387.
N.J. Petch and E. Wright:Proc. Roy. Soc. (London), 1980, vol. A370, p. 17.
R.W. Armstrong:Acta Met., 1968, vol. 16, p. 347.
A.H. Yegneswaran, Y. V. R. K. Prasad, and K.S. Raman:Metall. Trans. A, 1978, vol. 9A, p. 1311.
A.H. Yegneswaran, K.S. Raman, and Y. V. R. K. Prasad:Z. Metallk., 1980, vol. 71, p. 253.
D. V. Wilson and J. A. Chapman:Phil. Mag., 1963, vol. 8, p. 1543.
D. V. Wilson:J. Inst. Metals, 1966, vol. 94, p. 84.
D. V. Wilson:J. Inst. Metals, 1970, vol. 98, p. 133.
E.W. Kelley and W.F. Hosford, Jr.:Trans. TMS-AIME, 1968, vol. 242, p. 654.
J.G. Schulz:J. Appl. Phys., 1949, vol. 20, p. 1030.
H.M. Tomlinson:Phil. Mag., 1958, vol. 3, p. 867.
E. A. Calnan and C. J. B. Clews:Phil. Mag., 1951, vol. 42, p. 919.
J. J. Jonas, CM. Sellars, and W.J. McG.Tegart:Met. Rev., 1969, vol. 14, p. 1.
O. D. Sherby, R. H. Klundt, and A. K. Miller:Metall. Trans. A, 1977, vol. 8A, p. 843.
E. O. Hall:Proc. Phys. Soc. (London), 1951, vol. 64(B), p. 747.
N.J. Petch:J. Iron Steel Inst., 1953, vol. 25, p. 174;Phil. Mag., 1956, vol. 1, p. 966.
R.W. Armstrong:Defect Interactions in Solids, K.I. Vasu, K.S. Raman, D.H. Sastry, and Y.V.R.K. Prasad, eds., Proc. of Silver Jubilee Symposium, Department of Metallurgy, Indian Institute of Science, Bangalore, India, 1972, p. 61.
H. Conrad, R. W. Armstrong, H. Wiedersich, and G. Schoeck:Phil. Mag., 1961, vol. 6, p. 177.
P. W. Flynn, J. Mote, and J.E. Dorn:Trans. TMS-AIME, 1961, vol. 221, p. 1148.
Author information
Authors and Affiliations
Additional information
Formerly a QIP Research Scholar in the Department of Metallurgy, Indian Institute of Science, Bangalore 560 012, India,
Rights and permissions
About this article
Cite this article
Rao, G.S., Prasad, Y.V.R.K. Grain boundary strengthening in strongly textured magnesium produced by hot rolling. Metall Trans A 13, 2219–2226 (1982). https://doi.org/10.1007/BF02648393
Received:
Issue Date:
DOI: https://doi.org/10.1007/BF02648393