The Theoretical Study on the Mechanism of BDT in Machined Si Single Crystal

Abstract:

The mechanism of brittle-ductile transition (BDT) in machined Si single crystal is investigated by simulating dislocations emission from crack tip along (111) and (111) slip plane under mixed-mode loading. One kind of compression-shear crack is taken into account and the law of strain-energy-density-factor is applied as fracture criteria. The total number of the emitted dislocations and the number of dislocations in each slip plane at the onset of cleavage are calculated. It is found that the ratio of stress intensity factor kII to kI that the crack tip is subjected has significant effect on the BDT in machined Si single crystal. Then the results are applied to study the action of negative rake angle and edge radius of diamond tool in the ultra-precision turning.

• Periodical: Key Engineering Materials (Volume 339)
• Pages: 84-89
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.339.84
• Online since: May 2007
• Authors: Ming Hai Wang, Ze Sheng Lu
• Keywords: Brittle-Ductile Transition, Dislocation, Silicon

References

[1] P.N. Blake and R.O. Scattergood: American Soc of Mechanical Engineers Vol. 12 (1988), p.249.

[2] T.P. Leung, W.B. Lee and X.M. Lu: J. Mater. Process. Technol, Vol. 73 (1998), p.42.

[3] J.A. Pattern and W. Gao: Precision Engineering, Vol. 25 (2001), p.165.

[4] T. Shibata, S. Fujii, E. Makino and et al: Precision Engineering, Vol. 18 (1996), p.129.

[5] M. Brede: Acta metal. Mater, Vol. 41 (1993), p.211.

[6] Y.B. Xin and K.J. Hsia: Acta mater, Vol. 45 (1997), p.1747.

[7] B.D. Ferney and K.J. Hsis: Mater. Sci. Eng. A, Vol. 272 (1999), p.422.

[8] R.H. Zhao, S.H. Dai and J.C.M. Li: Int. J. Fracture, Vol. 29 (1985), p.3.

[9] J.C.M. Li: Scripta Metallurgica, Vol. 20 (1986), p.1477.

[10] V. Lakshmanan and J.C.M. Li: Mater. Sci. Eng. A, Vol. 104 (1988), p.95.

[11] C.F. Qian and J.C.M. Li: Mech. Mater, Vol. 24 (1996), p.1.

[12] C.F. Qian and J.C.M. Li: Mech. Mater, Vol. 24 (1996), p.11.

[13] B.D. Ferney and K.J. Hsia: Mater. Sci. Eng. A, Vol. 272 (1999), p.422.

[14] T.C. Wang: Philos. Mag. A, Vol. 7 (1998), p.31.

[15] M.L. Williams: J. Mech. Phys. Solids, Vol. 24 (1957), p.109.

[16] J.R. Rice and R. Thomson: Philos. Maga. A, Vol. 29 (1974), p.73.

[17] R. Thomson: J Mater Sci., Vol. 13 (1978), p.128.

[18] J.R. Rice: J. Mech. Phys. Solids, Vol. 40 (1992), p.239.

[19] G.C. Sih: Int. J. Fract, Vol. 10 (1974), p.305.