Processing, microstructure and property aspects of a spraycast Al–Mg–Li–Zr alloy

Processing map for hot working of spray formed and hot isostatically pressed Al–Li alloy (UL40)

“…The absence ofˇ is attributed to the sluggish precipitation due to the extremely low diffusion coefficient of Zr atom in Al (Starke et al, 1981). This is in consistent with the literature where inˇ precipitation was reported in Al-Li alloys either on homogenization (Noble and Bray, 1998;Ou et al, 1989) or on HIPing with long dwell time (>4 h) (Hogg et al, 2007). The absence of ı is related to the slow rate of cooling after HIPing at 500 • C, which promotes ı precipitation preferentially.…”

“…In contrast, only a few have addressed the hot deformation behavior of spray formed Al-Li alloys. Recently, Hogg et al (2007) studied the microstructural evolution during hot deformation of spray formed and HIPed Al-5.3Mg-1.15Li-0.28Zr alloy, and metallographic evidence was used to bring out significant mechanisms responsible for microstructural evolution. While, the present authors characterized the dynamic recovery (DRV) process during hot deformation of spray formed Al-4.12%Li using processing map technique (Jagan Reddy et al, 2008) and found the optimum deformation condition for DRV as 10 −1 s −1 in the temperature range 425-475 • C.…”

Dynamic restoration mechanism and physically based constitutive model of 2050 Al–Li alloy during hot compression

“…Shen et al [8] revealed the formation of DRX grains during hot compression of an extruded AleCueLi alloy. Hogg et al [9] indicated that the DRX of the AleMgeLieZr alloy occurred through nucleation and growth of new grains under the conditions of high temperature and low strain rate. Particle stimulated nucleation of DRX (PSN-DRX) in…”

Microstructure and property development in spray formed and extruded Al‐Mg‐Li‐Zr alloys for aerospace and autosport applications

“…Billets of 25 -35 kg each of approximately Ø 3006200 mm were spray formed using the Sandvik-Osprey spray forming unit housed at University of Oxford [9]. The calculated densities [12] are also shown in Table 1.…”

“…Furthermore, spray forming provides intrinsically a reduction in the concentration of embrittling impurity elements such as H, Na and K associated with Al-Li alloys. The microstructural development of these alloys during forging operations has been reported in detail elsewhere [9]. The work presented in this paper investigates the microstructural and texture development during extrusion to both simple and complex cross-sections.…”