Tensile properties of 5052 Al Matrix composites reinforced with B 4 C particles
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Possible {001} Planes of Crystal II
1-1
2-1 2-2 2-3 3-1 3-2 3-3
2-1
␣ 34 121 86 144 53 89
47 51 73 26 80 65
M
Misorientation
Predicted Crack Plane
Observed Crack Plane
0.57 0.32 0.02 0.73 0.10 0.01
45.22
2-1
Boundary → 2-1
33.71
3-1
Stop → 3-1
This work has been carried out as a part of the Reactor Pressure Boundary Materials Project under the Nuclear R& D Program by MOST in Korea. REFERENCES 1. R.E. Hook and J.P. Hirth: Acta Metall., 1967, vol. 15, pp. 535-51. 2. R.E. Hook and J.P. Hirth: Acta Metall., 1967, vol. 15, pp. 1099-1110. 3. S. Miura, K. Hamashima, and K.T. Aust: Acta Metall., 1980, vol. 28, pp. 1591-1602. 4. C. Rey and A. Zaoui: Acta Metall., 1982, vol. 30, pp. 523-35. 5. J. Luster and M.A. Morris: Metall. Mater. Trans. A, 1995, vol. 26A, pp. 1745-56. 6. J.D. Livingston and B. Chalmers: Acta Metall., 1957, vol. 5, pp. 322-27. 7. Z. Shen, R.H. Wagoner, and W.A.T. Clark: Scripta Metall., 1986, vol. 20, pp. 921-26. 8. T.A. Bamford, B. Hardiman, Z. Shen, W.A.T. Clark, and R.H. Wagoner: Scripta Metall., 1986, vol. 20, pp. 253-58. 9. V. Randle: Microtexture Determination and Its Applications, Institute of Materials, London, 1992. 10. D.J. Dingley and V. Randle: J. Mater. Sci., 1992, vol. 27, pp. 4545-66. 11. E. Bouyne, H.M. Flower, T.C. Lindley, and A. Pineau: Scripta Mater., 1998, vol. 39, pp. 295-300. 12. U.H. Lindborg and B.L. Averbach: Acta Metall., 1966, vol. 14, p. 1583. 13. J.P. Naylor and P.R. Krahe: Metall. Trans. A, 1975, vol. 6A, pp. 594-98.
Fig. 4—Schematic diagram showing crack propagation in adjacent grains having (a) pure tilt component, (b) pure twist component, and (c) both tilt and twist components.
adjacent grains is planar and normal to the crack propagation direction, the amounts of each component with respect to the crack propagation direction between two adjacent grains can be acquired from the pole figures, as seen in Figure 1(b). In most cases, in which crack propagation along the boundary was observed, the boundary had a twist component larger than 20 deg. In summary, the microstructure and behavior of brittle crack propagation in Mn-Mo-Ni low alloy steel have been analyzed using EBSD analysis in relation to crystallographic orientation. The geometric compatibility factor, M, could easily be calculated from the crystallographic data obtained from the EBSD analysis and matched well with real crack propagation. This factor explains well crack propagation characteristics, and a prediction of crack propagation characteristics is possible. 2142—VOLUME 32A, AUGUST 2001
Tensile Properties of 5052 Al Matrix Composites Reinforced with B4C Particles KON BAE LEE, HO SEOP SIM, SOO YEON CHO, and HOON KWON Because B4C has a low specific gravity (2.52 g/cm3), a hardness just below that of diamond (9.5 ⫹ in Mohs’ scale), and a similar thermal expansion coefficient to the SiC, it offers distinct advantages for various applications such as neutron absorption, wear resistance, and impact resistance.[1–8] B4C has thus been used as a reinforcing phase for the cermet
KON BAE LEE, Re
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