@article { , title = {Microstructure and property development in spray formed and extruded Al-Mg-Li-Zr alloys for aerospace and autosport applications}, abstract = {Low density Al-4Mg-1.3Li-0.4Zr and Al-6Mg-1.6Li-0.4Zr alloys were spray formed and the billets extruded under a range of conditions. The alloy compositions were selected to provide an attractive balance of tensile strength and elongation, without relying on complex post-processing and heat treatments - and are therefore suitable for complex cross section extrusions and free from quench distortion. The as-spray formed microstructures showed fine homogeneous, equiaxed grains with an average size of 10-15 lm. Firstly, a laboratory scale extrusion was carried out to extrude 30 mm diameter billets into 7.5 mm diameter cross-section and to investigate the effects of temperature and ram speeds on microstructural development. The microstructure after extrusion at 4008C was partially dynamically recrystallised with a l0.5 area fraction of l1 lm grains and the remainder were unrecrystallised elongated grains. Electron backscatter diffraction showed a mixed a111A + a100A double fibre texture. After peak age hardening at 1508C for 96 h, the Al-6Mg-1.6Li-0.4Zr alloy showed a 0.2\% proof strength of 495 MPa, a tensile strength of 553 MPa and elongation to failure of 8.5\%; Al-4Mg-1.3Li-0.4Zr showed a 0.2\% proof strength of 392 MPa, a tensile strength of 476 MPa and an elongation of 10\%. Subsequently, large-scale complex cross-section were extruded at l4008C. Due to the complexity of the cross-sections and the non-axisymetric deformation, the fibre texture was distorted to FCC rolled Copper and Brass orientations. After a dual-step age hardening treatment of 1308C for 8h followed by 1608C for 8h, the proof strength, ultimate strength and elongations were 340 MPa, 470 MPa and 16\% respectively. The combination of relatively simple process steps, high strength and ductility/formability, and low distortion in complex sections demonstrated the strong potential for these low density alloys in aerospace and autosport applications.}, doi = {10.1002/mawe.201000643}, eissn = {1521-4052}, issn = {0933-5137}, issue = {7}, journal = {Materialwissenschaft und Werkstofftechnik}, note = {Batch 005. Output ID 36896.}, pages = {562-567}, publicationstatus = {Published}, publisher = {Wiley-VCH Verlag}, url = {https://hull-repository.worktribe.com/output/405396}, volume = {41}, keyword = {Specialist Research - Other, Mechanical Engineering, General Materials Science, Mechanics of Materials, Condensed Matter Physics}, year = {2010}, author = {Hogg, S. C. and Mi, J. and Nilsen, K. E. and Liotti, E. and Grant, P. S.} }