Change channel angular pressing is a specially designed continuous processing technique to prepare bulk ultrafine grained materials. The extrusion process and structure evolution of Mg–9Li–3Al–2Sr alloy were analysed. The long strip phases of α-Mg and β-Li were sheared into short pieces during extrusion. The continuous distribution Al4Sr phases were extruded into small particles, which are mainly observed in the α/β phase interface and β-Li matrix phase. Structure homogeneity can be achieved, and the mechanical properties were improved with one pass processing. The effect of Al4Sr phase on the microstructure and mechanical properties of Mg–9Li–3Al–2Sr alloy was observed to be different due to the various extrusion modes and parts.
QuZ, WuL, WuR, ZhangJ, ZhangM and LiuB: ‘Microstructures and tensile properties of hot extruded Mg–5Li–3Al–2Zn–xRE(Rare Earths) alloys’, Mater. Des., 2014, 54, 792–795.
2.
LeQ, ZhangZ, ShaoZ, CuiJ and XieY: ‘Microstructures and mechanical properties of Mg-2Zn-0·4RE alloys’, Trans. Nonferrous Met. Soc. China, 2010, 20, 352–356.
3.
MordikeBL and EbertT: ‘Magnesium properties— applications—potential’, Mater. Sci. Eng. A, 2001, A302, 37–45.
4.
WangL, QiaoQ, LiuY and SongX: ‘Formability of AZ31 Mg alloy sheets within medium temperatures’, J. Magnesium Alloy, 2013, 1, 312–317.
5.
ChangHW, QiuD, TaylorJA, EastonMA and ZhangMX: ‘The role of Al2Y in grain refinement in Mg–Al–Y alloy system’, J. Magnesium Alloy, 2013, 1, 115–121.
6.
YangY, PengXD, WenHM, ZhengBL, ZhouYZ, XieWD and LaverniaEJ: ‘Influence of extrusion on the microstructure and mechanical behavior of Mg-9Li-3Al-xSr alloys’, Metall. Mater. Trans. A, 2013, 44A, 1101–1113.
7.
WangJ.-Y, ChangT.-C, ChangL.-Z and LeeS: ‘Effect of Al and Mn content on the mechanical properties of various ECAE processed Mg-Li-Zn alloys’, Mater. Trans., 2006, 47, 971–976.
8.
JiangB, YangQ, ZhangM, QiuD, LiR and PanF: ‘Grain refinement of Mg-Li-Al cast alloys by adding typical master alloys’, Prog. Natl. Sci., 2011, 21, 236–239.
9.
LiuT, WuSD, LiSX and LiPJ: ‘Microstructure evolution of Mg–14 Li–1 Al alloy during the process of equal channel angular pressing’, Mater. Sci. Eng. A, 2007, A460–A461, 499–503.
10.
XiangQ, WuRZ and ZhangML: ‘Influence of Sn on microstructure and mechanical properties of Mg–5Li–3Al–2Zn alloys’, J. Alloys Compd, 2009, 477, 832–835.
11.
DrozdZ, TrojanováZ and KúdelaS: ‘Deformation behaviour of Mg–Li–Al alloys’, J. Alloys Compd, 2004, 378, 192–195.
12.
YanH, ChenR.-S and HanE.-H: ‘Microstructures and mechanical properties of cold rolled Mg-8Li and Mg-8Li-2Al-2RE alloys’, Trans. Nonferrous Met. Soc. China, 2010, 20, 550–554.
13.
KimY.-H, KimJ.-H, YuH.-S, ChoiJ.-W and SonH.-T: ‘Microstructure and mechanical properties of Mg–xLi–3Al–1Sn–0·4Mn alloys (x = 5, 8 and 11wt)’, J. Alloys Compd, 2014, 583, 15–20.
14.
AljarrahM, ParvezMA, LiJ, EssadiqiE and MedrajM: ‘Microstructural characterization of Mg–Al–Sr alloys’, Sci. Technol. Adv. Mater., 2007, 8, 237–248.
15.
WangY, LiuG, WangF and FanZ: ‘Microstructural characterisation and thermal stability of an Mg-Al-Sr alloy prepared by rheo-diecasting’, Proc. 5th Decennial Int. Conf. on ‘Solidification processing’, Sheffield, UK, July 2007, University of Sheffield.
16.
YangM, PanF, ChengR and TangA: ‘Comparation about efficiency of Al–10Sr and Mg–10Sr master alloys to grain refinement of AZ31 magnesium alloy’, J. Mater. Sci., 2007, 42, 10074–10079.
17.
ChengR, PanF, JiangS, LiC, JiangB and JiangX: ‘Effect of Sr addition on the grain refinement of AZ31 magnesium alloys’, Prog. Natl. Sci., 2013, 23, 7–12.
18.
ChenG, PengX.-D, FanP.-G, XieW.-D, WeiQ.-Y, MaH and YangY: ‘Effects of Sr and Y on microstructure and corrosion resistance of AZ31 magnesium alloy’, Trans. Nonferrous Met. Soc. China, 2011, 21, 725–731.
19.
SwaminathanS, Ravi. ShankarM, RaoBC, ComptonWD, ChandrasekarS: KingA.H. and TrumbleK.P., ‘Severe plastic deformation (SPD) and nanostructured materials by machining’,J. Mater. Sci., 2007, 42, 1529–1541.
20.
EstrinY and VinogradovA: ‘Extreme grain refinement by severe plastic deformation: a wealth of challenging science’, Acta Mater., 2013, 61, 782–817.
21.
LinL, LiuZ, ChenL, LiuT and WuS: ‘Microstructure evolution and low temperature superplasticity of ZK40 magnesium alloy subjected to ECAP’, Met. Mater. Int., 2004, 10, 501–506.
22.
FigueiredoRB and LangdonTG: ‘Developing superplasticity in a magnesium AZ31 alloy by ECAP’, J. Mater. Sci., 2008, 43, 7366–7371.
23.
KhanKB, KuttyTRG and SurappaMK: ‘Hot hardness and indentation creep study on Al–5 Mg alloy matrix–B4C particle reinforced composites’, Mater. Sci. Eng. A, 2006, A427, 76–82.
24.
MahallawyNE, ShehataFA, HameedMAE, AalMIAE and KimHS: ‘3D FEM simulations for the homogeneity of plastic deformation in Al–Cu alloys during ECAP’, Mater. Sci. Eng. A, 2010, A527, 1404–1410.
25.
BaiJ, SunY, XueF, XueS, QiangJ and TaoW: ‘Effect of extrusion on microstructures, and mechanical and creep properties of Mg–Al–Sr and Mg–Al–Sr–Ca alloys’, Scr. Mater., 2006, 55, 1163–1166.
26.
YangCW, LuiTS, ChenLH and HungHE: ‘Tensile mechanical properties and failure behaviors with the ductile-to-brittle transition of the α+β-type Mg–Li–Al–Zn alloy’, Scr. Mater., 2009, 61, 1141–1144.
27.
KumarA, SinghSB and RayKK: ‘Influence of bainite/martensite-content on the tensile properties of low carbon dual-phase steels’, Mater. Sci. Eng. A, 2008, A474, 270–282.
28.
ChawlaKK: ‘On the applicability of the ‘Rule-of-Mixtures’ to the strength properties of metal-matrix composites’,Rev. Bras. Fis., 1974, 4, 411–418.
29.
FuS.-Y and LaukeB: ‘Effects of fiber length and fiber orientation distributions on the tensile strength of short-fiber-reinforced polymers’, Compos. Sci. Technol., 1996, 56, 1179–1190.
30.
ZhouD.-W, LiuJ.-S and PengP: ‘A first-principles study on electronic structure and elastic properties of Al4Sr, Mg2Sr and Mg23Sr6 phases’, Trans. Nonferrous Met. Soc. China, 2011, 21, 2677–2683.
31.
BaeDH and GhoshAK: ‘Cavity formation and early growth in a superplastic Al–Mg alloy’, Acta Mater., 2002, 50, 511–523.
