Abstract
We investigated the effect of solution temperature (Tsol. = 440–530 °C) on the mechanical properties of the Al–3.4Cu–0.34Mg–0.3Mn–0.17Ag alloy, finding that the investigated Al alloy showed the highest mechanical strength of σUTS = ~329 MPa at a Tsol. value of 470 °C. The microstructural investigation demonstrates that the mechanical properties for different Tsol. values stem from grain growth, precipitation hardening, and the formation of large particles at the grain boundaries. On the basis of Tsol. = 470 °C, the effect of each microstructural evolution is significantly different on the mechanical properties. In this study, the relationships between the microstructural evolution and the mechanical properties were investigated with respect to different values of Tsol.
Highlights
High-strength Al–Cu (5.0 wt.% < Cu < 7.0 wt.%)–Mg–Ag-based alloys have been widely used owing to their excellent mechanical strength with the advantage of mass production [1,2,3,4,5]
We investigated the microstructural evolution of the Al–3.4Cu–0.34Mg–0.3Mn–0.17Ag alloy with respect to a wide range of Tsol. values
The used Tsol. could be divided into three ranges based on the Cu solid solution: (1) an insufficient solution temperature range (Tsol. < 470 ◦ C), (2) a sufficient solution temperature range (Tsol. ≈ 470 ◦ C), and (3) a high solution temperature range (Tsol. > 470 ◦ C)
Summary
High-strength Al–Cu (5.0 wt.% < Cu < 7.0 wt.%)–Mg–Ag-based alloys have been widely used owing to their excellent mechanical strength with the advantage of mass production [1,2,3,4,5]. To obtain high mechanical properties, Al–Cu–Mg alloys require posttreatment processes, such as a heat treatment and plastic working. Cu–Mg-based alloys are solution-treated at ~530 ◦ C [2,3,7,10,18], while the maximum solubility of Cu to Al is only 5.57 wt.% Cu. the solution treatment temperature is not high enough to re-dissolve the Cu minor elements into the Al matrix if the Cu content is higher than 5.57 wt.%. An insufficient solution temperature induces the residual second phase particles in the grain boundaries of Al, leading to the insufficient formation of precipitates in the Al matrix during the artificial aging process. 0.17Ag alloy in order to investigate the wide temperature range solution treatment maximum solid solution state can be achieved at 470 C, whichfor is the far below the melting process. 470 the this study strategy by which optimize conditions of the solution strategy byinwhich conditions ofAl–Cu-Mg-based the solution treatment treatment orderto tooptimize develop athe high-strength alloy. in order to develop a high-strength Al–Cu-Mg-based alloy
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