The precipitation hardening response, microstructure and mechanical properties of three Al–5·3Cu–0·8Mg–0·6Ag based alloys containing 0, 0·15 and 0·25 wt-%Yb were investigated using optical microscopy, scanning electron microscopy, energy dispersive X-ray spectroscopy and transmission electron microscopy. It is shown that increasing Yb content from 0 to 0·25 wt-% increased the tensile strength at all test temperatures up to 300 °C. The high strength of the alloys with Yb is attributed to the high density and high thermal stability of fine Ω precipitates.
KannoM., SuzukiH. and KanohO.: J. Jpn Inst. Light Met., 1979, 29, 223.
2.
SuzukiH., KannoM. and KanohO.: J. Jpn Inst. Light Met., 1980, 44, 1139.
3.
HoweJ. M.: Philos. Mag. Lett., 1994, 70, 111.
4.
PolmearI. J.: Trans. Metall Soc. AIME, 1964, 230, 1331.
5.
TaylorJ. A., ParkerB. A. and PolmearI. J.: Met. Sci., 1978, 12, 478.
6.
ChesterR. J. and PolmearI. J.: ‘The metallurgy of light alloys’,75–81; 1983, London, The Institution of Metallurgists.
7.
PolmearI. J. and CouperM. J.: Metall. Trans. A, 1988, 19A, 1027.
8.
PolmearI. J.: US Patent4772 342, 1988, USA.
9.
PolmearI. J., PonsG., BarbauxY., OctorH., SanchezC., MortonA. J., BorbidgeW. E. and RogersS.: Mater. Sci. Technot, 1999, 15, 861.
10.
LumleyR. N. and PolmearI. J.: Scr. Mater., 2004, 50, 1227.
11.
AuldJ. H.: Acta Crystallogr. A, 1972, 28A, 98.
12.
ScottV. D., KerryS. and TrumperR. L.: Mater. Sci. Technol., 1987, 3, 827.
13.
MuddleB. C. and PolmearI. J.: Acta Metall., 1989, 37, 777.
14.
GargeA. and HoweJ. M.: Acta Metall. Mater., 1991, 39, 1939.
15.
AbisS., MengucciP. and RiontinoG.: Philos. Mag. B, 1994, 67B, 465.
16.
ButtinelliD., FelliF., LupiC. and MaraniE.: in ‘Aluminium—lithium’, (ed. M. Peters and P.-J. Winkler),Vol. 11, 433; 1992, Oberursel, DGM Informationsgesellschaft mbH.
17.
XiaoD. H., WangJ. N., DingD. Y. and YangH. L.: J. Alloys Compd, 2003, 352, 84–88.
18.
XiaoD. H., WangJ. N. and DingD. Y.: Mater. Sci. Technot, 2004, 20, 1237.
19.
MengL., ZhengX. L. and TianL.: Mater. Sci. Eng. A, 1995, A196, 191.
20.
MengL., ZhangB. C., LiangY. and ZhangW. Z.: Acta Metall. Sin. A, 1992, 5A, 336.
21.
MengL., GengD. S. and ZhengX. L.: J. Rare Earths, 1996, 14,41.
22.
ChangY. C. and HoweJ. M.: Metall. Trans. A, 1993, 24A, 1461.
23.
RingerS. P., YeungW., MuddleB. C. and PolmearI. J.: Acta Metall. Mater., 1994, 42, 1715.
24.
HutchinsonC. R., FanX., PenyciikS. J. and ShifletG. J.: Acta Mater., 2001, 49, 2827.
