The influence of gadolinium on the microstructure and mechanical properties of Mg–9Li–3Al alloy was investigated. Results show that the addition of Gd can effectively refine the α-Mg phase and change the morphology of the α-Mg phase. Meanwhile, the Al3Gd phase is mainly distributed at the boundaries of the α-Mg phase and inside the α-Mg phase. The mechanical property tests reveal that the addition of Gd can effectively improve the mechanical properties of the as cast alloys. When the content of Gd is 2·0, the tensile strength and yield stress (engineering stress) reach max values of 188 and 174 MPa respectively. When the content of Gd addition is 2·5, the elongation of the alloy is 15·7.
LuoAA: ‘Magnesium casting technology for structural applications’, J. Magnesium Alloys, 2013, 1, 2–22.
2.
CrawfordP, BarossaR and MendezJ: ‘On the transformation characteristics of AL14A (Mg-14Li-1Al) alloy’, J. Mater. Process. Technol., 1996, 56, 108–118.
3.
WatanableH and TsutsuiH: ‘Deformation mechanism in a coarse-grained Mg-Al-Zn alloy at elevated temperatures’, Int. J. Plast., 2001, 17, 387–397.
4.
ZhengXW, DongJ, LiuWC and DingWJ: ‘Microstructure and mechanical properties of NZ30K alloy by semi-continuous direct chill and sand mould casting processes’, China Foundry, 2011, 8, (1), 41–46.
5.
StanfordN and BarnettM: ‘Effect of composition on the texture and deformation behavior of wrought Mg alloys’, Scr. Mater., 2008, 58, 179–182.
6.
GehrmannR, FrommertMM and GottsteinG: ‘Texture effects on plastic deformation of magnesium’, Mater. Sci. Eng. A, 2005, A395, 338–349.
7.
SongGL: ‘Corrosion of magnesium alloys’, Elsevier Science, 2011, 67–72.
8.
ASM Handbook: ‘Properties and selection: nonferrous alloys and special-purpose materials’, ASM Int., 1993, 265–289.
9.
JensenJA and ChumbleyLS: ‘Processing and mechanical properties of magnesium-lithium composites containing steel fibers’, Metall. Mater. Trans. A, 1998, 29A, 863–873.
10.
YamamotoA, AshidaT and KoutaY: ‘Precipitation in Mg-(4-13) Li-(4-5) Zn ternary alloys’, Mater. Trans., 2003, 44, 619–624.
11.
DrozdZ, TrojanovaZ and KudelaS: ‘Deformation behavior of Mg–Li–Al alloys’, J. Alloys Compd, 2004, 378, 192–195.
12.
LiuT, ZhangW and WuSD: ‘Mechanical properties of a two-phase Mg-8Li-1Al processed by equal channel angular pressing’, Mater. Sci. Eng. A, 2003, A360, 345–349.
13.
SivakesavamO and PrasadYV: ‘Characteristics of superplasticity domain in the processing map for working of as-cast Mg-11·5Li-1·5A1 alloy’, Mater. Sci. Eng. A, 2002, A323, 270–277.
14.
YuHS and MingGH: ‘Effect of alloying elements on Mg–Li base alloys’, Rare Met. Mater. Eng., 1996, 25, 1–5.
15.
WangT, ZhangML and WuRZ: ‘Effect of cerium on the microstructure and mechanical properties of Mg–8Li–3Al alloys’, J. Rare Earths, 2007, 194.
16.
YangY, PengXD and WeiQY: ‘Microstructure and mechanical properties of a new α+β-type Mg–9Li–3Al-2·5Sr alloy’, Rare Met. Mater. Eng., 2014, 43, 1281–1285.
17.
JiangB, YangQS, ZhangMX, QiuD, LiRH and PanFS: ‘Grain refinement of Mg–Li-Al cast alloys by adding typical master alloys’, Prog. Nat. Sci., 2011, 21, 236–239.
18.
YangMB and PanFS: ‘Effect of Y on microstructure and mechanical properties of Mg-3Sn-Ca (wt. ) alloys’, Mater. Sci. Eng. A, 2009, A525, (1–2), 112–120.
19.
RanQS, LukasHL, EffenbergG and PetzowJ: ‘A thermodynamic optimization of the Al-Y system’, J. Less-Common Met., 1989, 146, 213–222.
20.
BuschowKHJ and Van VuchtJHN: ‘Systematic arrangement of the binary rare-earth–aluminium systems’, Philips Res. Rep., 1967, 22, 233–245.
21.
GaoL, ChenRS and HanEH: ‘Effects of rare-earth elements Gd and Y on the solid solution strengthening of Mg alloys’, J. Alloys Compd, 2009, 481, 379–384
22.
EastonM and St-johnD: ‘Grain refinement of aluminum alloys: Part I. The nucleant and solute paradigms-a review of the literature’, Metall. Mater. Trans. A, 1999, 30A, 1613–1623.
23.
EastonM and St-johnD: ‘Grain refinement of aluminum alloys: Part II. Confirmation of, and a mechanism for, the solute paradigm’, Metall. Mater. Trans. A, 1999, 30A, 1625–1633.
24.
XiaoJM: ‘Alloy phase transformation’; 1987, Beijing, Beijing Metallurgical Industry Press.
25.
YangJ, XiaoWL, WangLD, WuYM, WangLM and ZhangHJ: ‘Influence of Gd on the microstructure and strength of Mg-4·5Zn alloy’, Mater. Charact., 2008, 59, 1667–1674.
26.
BakerH: ‘Introduction to alloy phase diagrams, alloy phase diagrams’, Vol. 3, in ‘ASM handbook’, 1–29; 1992, Materials Park, OH, ASM International.
27.
ZhangJH, YuP, LiuK, FangDQ, TangDX and MengJ: ‘Effect of substituting cerium-rich mischmetal with lanthanum on microstructure and mechanical properties of die-cast Mg–Al–RE alloys’, Mater. Des., 2009, 30, 2372–2378.
28.
XuDK, LiuL, XuYB and HanEH: ‘The influence of element Y on the mechanical properties of the as-extruded Mg-Zn-Y-Zr alloys’, J. Alloys Compd, 2006, 426, 155–161.
29.
LeeS, LeeSH and KimDH: ‘Effect of Y, Sr, and Nd additions on microstructure and microfracture mechanism of squeeze cast AZ91-X magnesium alloys’, Mater. Trans. A, 1998, 29A, 1221–1235.
30.
ZouHH, ZengXQ, ZhaiCQ and DingWJ: ‘The effects of yttrium element on microstructure and mechanical properties of Mg–5 wt. Zn–2 wt. Al alloy’, Mater. Sci. Eng. A, 2005, A402, 142–148.
31.
WangJ, FuJW, DongXG and YangYS: ‘Microstructure and mechanical properties of as-cast Mg–Al–Sn–Y–Nd alloy’, Mater. Des., 2012, 36, 432–437.
32.
BhatTB and ArunachalamVS: ‘Strengthening mechanisms in alloys’, Proc. Indian Acad. Sci. Eng. Sci., 1980. 3, 275–296.
33.
JinJB, WangZX, LiuXF and XieJX: ‘Effect of homogenizing treatment on microstructures and properties of AZ91 alloy’, Acta Metall. Sinica, 2006, 42, (10), 1014–1018.
34.
SinghA, WatanabeM, KatoA and TsaiAP: ‘Microstructure and strength of quasicrystal containing extruded Mg–Zn–Y alloys for elevated temperature application’, Mater. Sci. Eng. A, 2004, A385, 382–396.
35.
ZhangJH, LengZ, ZhangML, MengJ and WuRZ: ‘Effect of Ce on microstructure, mechanical properties and corrosion behavior of high-pressure die-cast Mg–4Al-based alloy’, J. Alloys Compd, 2011, 509, 1069–1078.
