Abstract
Aging heat treatment is the most commonly used strengthening method for Al–Mg–Si alloys since high-density precipitates will be formed to hinder the movement of dislocations. In the current work, room temperature cyclic deformation was attempted to strengthen the alloy. We compared tensile test results of aged samples and cyclically deformed samples. It was found that cyclically deformed samples can achieve similar strength and approximately twice the uniform elongation as the peak aged samples. The high density of dislocations and nanoclusters observed in the cyclically deformed samples is thought to be the main reason for strengthening. Different cyclic deformation conditions have been tried and their effects were discussed.
Highlights
In order to mitigate the environmental burden of global warming, it is important to reduce greenhouse gas emissions such as carbon dioxide
We investigated the effect of cyclic deformation on mechanical properties in an extruded 6082 Al alloy and examined the industrial outlook by comparing it with traditional artificial aging heat treatment
For the precipitation in naturally aged (NA) samples, the driving force for nucleation is great while the diffusivity for growth is low, which results in the formation of uniformly distributed high-density nanoclusters
Summary
In order to mitigate the environmental burden of global warming, it is important to reduce greenhouse gas emissions such as carbon dioxide. Cluster 1 formed at room temperature dissolves at temperatures above 473 K, so solution heat treatment (SHT) can be applied to eliminate the effects of natural aging [17]. The cyclic strengthening (CS) method proposed by Sun et al introduces dislocations and accelerates the diffusion of solute atoms to form nanoclusters by applying periodic, reciprocating plastic deformation, thereby greatly improving the strength [16]. Cyclic deformation can improve the fatigue performance of Al alloys [24] and even strengthen the non-heattreatable Al–Mg alloys by forming clusters [25]. We investigated the effect of cyclic deformation on mechanical properties in an extruded 6082 Al alloy and examined the industrial outlook by comparing it with traditional artificial aging heat treatment. The strengthening effect of cyclic deformation under different conditions was discussed
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