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Strain rate dependence of compressive behavior in an Al-Zn-Mg alloy processed by ECAP


 Experiments were conducted to study the compressive mechanical properties of an Al-Zn-Mg alloy after solid solutiontreatment and equal-channel angular pressing (SS-ECAP) using strain rates ranging from 1.0x10-3to 3.0x103 s-1. The results show that SS-ECAP processing enhances the compressive strength due to the high dislocation density, large numbers of fine precipitates and grain refinement. The alloy in both the peak-aged (as-received) and the SS-ECAPstates shows a strain rate strengthening effect such that the strain rate sensitivity increases with increasing strain rate. Thehigh volume fraction of fine precipitates in theSS-ECAP alloy decreases the strain rate sensitivity. The coarse precipitates in the peak-aged alloy are fragmented while their sizes increase in the SS-ECAP alloy due to dynamic precipitation assisted by the high density of dislocations during compressive testing. With increasing strain rate, the size of the precipitates further increases for the SS-ECAP alloy and this is influenced by accelerated dislocation motion. During compression, the T (Al20Cu2Mn3) and E (Al18Mg3Cr2) phases evolve into a new tetragonal phase containing Mg, Mn, Cr and Zn with Al.



In this paper we had many interesting findings like : 

High fraction of fine precipitates after SS-ECAP decreases strain rate sensitivity.

A new phase forms evolved from T and E phases during compression.

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