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Abstract : A survey of possible mechanisms impeding and influencing glide processes in metals with impurities solutes and particles is given. After putting together the elementary interactions, the threshold stress for a single dislocation is considered, its successful calculations for T = 0 and the effects of thermal fluctuations are summarized. Then the behaviour of many dislocations moving either independently of each other or in correlated groups is discussed for solid solutions in stage I, the simultaneous occurrence of hardening and softening mechanisms in pointed out. Finally, the dislocation-dislocation interactions of strain hardening are taken into account. In general, they superimpose on the dislocation-impurity interactions not in a simply additive, but in a multiplicative way.

Keywords : hardening impurity dislocation interactions slip glide impurities thermal fluctuations dislocations solid solutions softening dislocation dislocation interactions dislocation impurity interactions





Author: C. Schwink

Source: https://hal.archives-ouvertes.fr/



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