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

Hogg, S. C.; Mi, J.; Nilsen, K. E.; Liotti, E.; Grant, P. S.


S. C. Hogg

K. E. Nilsen

E. Liotti

P. S. Grant


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.


Hogg, S. C., Mi, J., Nilsen, K. E., Liotti, E., & Grant, P. S. (2010). Microstructure and property development in spray formed and extruded Al-Mg-Li-Zr alloys for aerospace and autosport applications. Materials Science and Engineering Technology / Materialwissenschaft und Werkstofftechnik, 41(7), 562-567.

Journal Article Type Article
Acceptance Date May 11, 2010
Online Publication Date Jul 22, 2010
Publication Date Jul 1, 2010
Journal Materialwissenschaft und Werkstofftechnik
Print ISSN 0933-5137
Electronic ISSN 1521-4052
Publisher Wiley-VCH Verlag
Peer Reviewed Peer Reviewed
Volume 41
Issue 7
Pages 562-567
Keywords Mechanical Engineering; General Materials Science; Mechanics of Materials; Condensed Matter Physics
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