Simultaneous improvement in corrosion resistance and hardness of a model 2xxx series Al-Cu alloy with the microstructural variation caused by Sc and Zr additions

Novel Al-Cu-Mn-Zr-Sc Compositions Exhibiting Increased Mechanical Performance after a High-Temperature Thermal Exposure

“…It was found that combining the effects of Al 3 (Zr, Sc) dispersoids and controlled Mn additions resulted in a fine dispersion of precipitates that could be subsequently stabilized during a high-temperature thermal exposure resulting in increased mechanical properties. This work appears to confirm the findings of previous studies (Ref [9][10][11][12] that Al 3 (Zr, Sc) dispersoids can directly affect h¢ precipitation (even without cold work). As the mechanisms behind this effect are discussed elsewhere (Ref 9, 11-13), they will be omitted herein.…”

“…Recently, the effects of Al 3 (Zr, Sc) dispersoids on h-type precipitates were documented ( Ref 9,[11][12][13]. It was found that Al 3 (Zr, Sc) dispersoids could refine the precipitates in Al-Cu alloys with and without the use of cold work following solution heat treatment (SHT) resulting in increased mechanical properties (Ref 9, 13).…”

“…While Sc additions to aluminum alloys have been the subject of several academic articles ( Ref 7,8,11,[16][17][18][19][20][21][22] and patents (Ref [23][24][25][26][27], compositions and processing methods suitable for producing high-strength, aerospace grade h-phase alloys are scarce. For example, very little information exists with regards to homogenization practices geared toward forming core-shell dispersoids even though such information would be pertinent to the successful industrialization of such products.…”

Effects of Al8Cu4Er Phase on Corrosion Behavior of Al–Cu–Mg alloy with Er addition

“…A previous study has shown that when adding rare earth Nd into the Al-5 Mg alloy, the pitting corrosion resistance was not significantly affected because the newly generated Al 11 Nd 3 phase did not affect localized corrosion [35]. Recently, the addition of rare earth Sc and Zr to 2xxx series Al-Cu alloy was studied [36]. The results showed that the pitting corrosion resistance can be improved by adding Sc and Zr, as the sizes of the newly generated W-phase and Al 3 (Sc, Zr) phase were refined although their number densities increased.…”

“…The results showed that the pitting corrosion resistance can be improved by adding Sc and Zr, as the sizes of the newly generated W-phase and Al 3 (Sc, Zr) phase were refined although their number densities increased. Therefore, the characteristics [35] and size [36] of newly generated phase yielded by adding rare earth significantly affected the pitting corrosion resistance. In this study, the local region at the Al 8 Cu 4 Er phase was sensitive to localized corrosion.…”