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Gerold, B.
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article
Processing-controlled suppression of Lüders elongation in AlMgMn alloys
Abstract
<p>The Lüders elongation, ε<sub>L</sub>, its dependence on grain size, and its processing-controlled suppression are examined on several AlMgMn alloys. We found that grain size variations result in a Hall-Petch-type ε<sub>L</sub>relation. We interpret the increase in macroscopic flow stress upon ε<sub>L</sub>as a transitional increase in the activation stress of dislocation sources, expressed by an additional term of the Hall-Petch coefficient. The decisive measure for suppressing ε<sub>L</sub>is based on the formation of non-aged dislocations. We demonstrate that these can be created intrinsically by utilization of the difference in the thermal expansion of matrix and primary constituents upon quenching.</p>