Study on the microstructure in a friction stir welded 2519-T87 Al alloy

Research on the Friction Stir Welding of Sc-Modified AA2519 Extrusion

“…In all analyzed samples the heat-affected zone (which can be identified by the lower value of the microhardness comparing to the base material) is difficult to distinguish. During the welding process, the heat-affected zone is an area in which undesirable heat-activated process took places including grain growth, overaging of strengthening phase (in case of precipitated hardened aluminum alloys), and as an additional factor, this zone has the highest value of residual stress [3,20,53]. The overaging of θ΄ phase is the main reason for the softening of the heat-treated AA2519 in the heat-affected zone [20,54].…”

“…In the case of friction stir welding, this problem does not occur because the temperature of the process is lower than Al/Al 2 Cu eutectic temperature [2,[17][18][19]. For this reason, FSW has a great potential in terms of joining high-strength aluminum alloys having high copper concentration, such as AA2219 and AA2519 [10,18,[20][21][22]. AA2519 is an alloy with great interests, particularly in military applications due to its high specific strength and good ballistic performance [10,23,24].…”

“…Although the most commonly aluminum alloys used in industry were widely examined in terms of the parameters-properties relationship, publications on the Sc-containing aluminum alloys are still a significant research gap [1,2,5,10,33,38,40]. In the case of AA2519 alloy, only a few investigations are concerned with the influence of friction stir welding on the properties of the joint [10,20,43].…”

Correlative evolution of microstructure, particle dissolution, hardness and strength of ultrafine grained AA6063 alloy during annealing

“…There are many research concerning the correlations between the physical, mechanical and corrosion properties of metals and the grain structure and the effect of annealing treatment on the development of microstructure [15][16][17][18][19]. It is generally desirable to apply an annealing treatment to promote grain refinement but inhibit grain growth, since a coarser grain structure is expected to indicate lower strength, hardness and elongation.…”

Effects of stored strain energy on restoration mechanisms and texture components in an aluminum–magnesium alloy prepared by friction stir processing

“…Recrystallization mechanisms and textural evolutions during FSP of various aluminum alloys, e.g., AA6082, AA6063, AA2024, Al-Si, Al-Mg-Sc, AA2519 and AA6016, has been studied by different researchers [20][21][22][23][24][25][26][27]. Studies have shown that the microstructural evolution is mainly controlled by restoration mechanisms occurring during FSP [28].…”