The effect of slip distribution on the monotonic and cyclic ductility of AlLi binary alloys

The effect of inhomogeneous plastic deformation on the ductility and fracture behavior of age hardenable aluminum alloys

“…Low ductility resulting from low energy intergranular fracture in high-purity Al-Li alloys has been previously associated with strain localization in the matrix (Sanders and Starke, 1982;Furukawa et al, 1985;Cassada et al, 1986). The strain localization was attributed to the shearing of d 0 particles resulting in coarse planar slip and the formation of intense shear bands.…”

“…The d 0 precipitates maintain a cube-cube crystallographic relationship with the a-Al matrix while the h 00 /h 0 and T 1 particles precipitate on matrix {0 0 1} and {1 1 1} habit planes, respectively. The Li contents for both AF/C-458 and AF/C-489 alloys are sufficient to precipitate out the spherical, shearable, and coherent d 0 particles (Sanders and Starke, 1982). Gable et al (2001) showed that plastic deformation prior to artificial aging enhanced the competitive precipitation kinetics of the T 1 precipitate, the more potent strengthener, at the expense of weaker h 00 /h 0 for AF/ C-458.…”

Effect of prolonged high-temperature exposure on the fatigue and fracture behavior of aluminum-lithium alloy 2090

“…Such deposits, however, were considered unlikely to promote significant oxideinduced crack closure (18,19), as their size was small compared to cyclic and maximum crack tip opening displacements (i.e., which were of the order of 50 and 150 nm, respectively, at ~KrH). * Decreasing slip planarity is generally considered to 'increase toughness, as planar slip can lead to strain localization at grain boundaries, thereby enhancing the formation of microcracks or voids at grain boundary precipitates (20,(24)(25)(26).…”

Microstructural Characterization and Mechanical Properties of New Grade Al-Li Alloy

“…For this reason, these alloys have not been used much in the aerospace industry compared to, for example, the more conventional aluminum alloys such as Al-Cu and Al-Zn. Although the fracture toughness behavior of Al-Li alloys had been widely studied, it remains an interesting, important and challenging research subject [9,10]. Recently, materials scientists developed a new Al-Li alloy grade called C460 with improved ductility and fracture toughness, while maintaining high strength.…”