Journal of Materials Science

, Volume 43, Issue 4, pp 1220–1227 | Cite as

Natural ageing in magnesium alloys and alloying with Ti

  • Joka BuhaEmail author


This article reports on a remarkable natural ageing response observed for the first time in this work in Mg–Zn-based alloys. In these alloys, hardness in the naturally aged condition, generally, almost equals that in the artificially aged condition. The time to maximal hardness in the naturally aged condition can be dramatically reduced from several months needed for a binary Mg–Zn alloy, to a practical duration of a few weeks when some additional alloying elements that act as accelerants are added. Examples of such elements presented here are Cu and Ti. Strengthening in the naturally aged condition of these alloys is achieved through the formation of a very high density of Guinier-Preston (GP) zone-type precipitates. Both Cu and Ti also enhance the artificial ageing response by increasing the number density of the strengthening precipitates. Unlike Cu, Ti is not detrimental to the corrosion resistance and the current results indicate that it also has a very pronounced grain-refining effect on the Mg–Zn-based alloys.


Magnesium Alloy Natural Ageing Artificial Ageing Solution Heat Treatment Temperature Magnesium Lattice 



The author wishes to acknowledge the financial support of the Japanese Society for the Promotion of Science (JSPS) in the form of a JSPS Postdoctoral Fellowship.


  1. 1.
    Lorimer GW (1986) Magnesium technology. Institute of Metals, London, p 47Google Scholar
  2. 2.
    Clark JB (1965) Acta Metall 13:1281CrossRefGoogle Scholar
  3. 3.
    Gao X, Nie JF (2007) Scripta Mater 56:645CrossRefGoogle Scholar
  4. 4.
    King JF, Unsworth W (1980) US Patent 4239535Google Scholar
  5. 5.
    Unsworth V (1987) Light Metal Age 8:10Google Scholar
  6. 6.
    Mima G, Tanaka Y (1971) Trans JIM 12:71CrossRefGoogle Scholar
  7. 7.
    Takahashi T, Kojima Y, Takahashi K (1973) Jpn J Inst Light Metals 23:376CrossRefGoogle Scholar
  8. 8.
    Polmear IJ (1995) Light alloys: metallurgy of the light metals, 3rd edn. Arnold, London, p 204Google Scholar
  9. 9.
    ASM Specialty Handbook (1998) Magnesium and magnesium alloys. ASM International, p 27Google Scholar
  10. 10.
    Hansen M (1958) Constitution of binary alloys, 2nd edn., written in cooperation with Anderko K. McGraw-Hill Book Co., New York, p 924Google Scholar
  11. 11.
    Wei LY, Dunlop GL, Westengen GL (1995) Metall Mater Trans A 26A:1947CrossRefGoogle Scholar
  12. 12.
    Kelly A, Nicholson RB (1963) Prog Mater Sci 10:151CrossRefGoogle Scholar
  13. 13.
    Lomer WM (1958) Inst Metals Monogr Rep Ser 23:79Google Scholar
  14. 14.
    Embury JD, Nicholson RB (1965) Acta Metall 13:403CrossRefGoogle Scholar

Copyright information

© Springer Science+Business Media, LLC 2007

Authors and Affiliations

  1. 1.National Institute for Materials ScienceTsukubaJapan

Personalised recommendations