Abstract
The occurrence of abnormal grain growth (AGG) in AA5182 alloy during annealing imposes severe restrictions on processing parameters and deteriorates mechanical properties. In this work, we investigated the effect of chemical composition on the appearance of abnormal grain growth by varying Mg and Mn content in the range of composition limits for standard AA5182 alloy, 4.0-5.0% Mg, and 0.2-0.5% Mn, respectively. Thermo-mechanical processing of alloys included cold rolling with reductions ranging from 40 to 85%, followed by annealing in the temperature range from 350 to 520 °C. The results showed that the rise in alloying elements content drives the onset of abnormal grain growth toward higher temperatures. The increase in the cold rolling reduction degree promotes abnormal grain growth and lowers its onset temperature. Abnormal grain growth and grain boundary mobility showed strong anisotropy related to rod-like shape and alignment of Al6Mn(Fe) dispersoids through Zener pinning.
Highlights
The current design of Al alloys is, in a significant part, directed toward modification and improvement of properties of existing alloys
This study is aimed to investigate whether minor variation in the chemical composition of AA5182 alloys, while staying in the range of composition limits defined by the standard, affects abnormal grain growth (AGG)
With chemical compositions within a range defined by the standard for AA5182 alloy (Table 1), were characterized after undergoing the same thermomechanical treatment to evaluate whether minor compositional variations influence the occurrence of abnormal grain growth
Summary
The current design of Al alloys is, in a significant part, directed toward modification and improvement of properties of existing alloys. An example is “traditional” Al-Mg alloy AA5182, where improvement of mechanical properties can lead to the introduction of new qualities and expansion of its applications in the transportation industry [1]. The propensity of the alloy toward abnormal grain growth (AGG) severely limits the annealing temperature range and its capability for hot forming [2]. AGG - duplex grain size distribution, i.e., development of microstructure. 315-323 consisting of large grains surrounded by finer, severely deteriorates mechanical properties of the alloy Vol 25 (4) 2019 p. 315-323 consisting of large grains surrounded by finer, severely deteriorates mechanical properties of the alloy
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