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On the stability of orowan loops around coherent spherical ordered precipitates

1989; University of Toronto Press; Volume: 37; Issue: 9 Linguagem: Inglês

10.1016/0001-6160(89)90044-8

1878-0768

Y. Bréchet, F. Louchet,

Metallurgy and Material Forming

Abstract The stability of a glissile loop around a coherent ordered precipitate is discussed in terms of applied stress, line tension and antiphase boundary energy. The case of a double loop is also examined. It is shown that, above a critical stress, the precipitates are sheared by the loops. This can occur for precipitate radii above the classical transition between shearing and Orowan by-passing, and is illustrated in the case of Al-Li alloys, where δ′ precipitates are by-passed by an Orowan mechanism, and then sheared by the Orowan loop.