AJ alloys

AJ alloys (AJ52 and AJ62) are die castable alloys of magnesium that have good creep resistance at high temperature. They contains magnesium, aluminum, and strontium.^[1]

In the names the 'J' refers to Strontium.

Alloy   Mg     Al%  Sr%  Mn% 
AJ62  Balance  6    2    0.34   [2]
AJ52  Balance  5    2    0.4    [3]

AJ52 has higher creep resistance, and AJ62 has better castability. Both are used in the BMW magnesium–aluminum composite engine block.^[4]

References

1. ^ M. Scharrer et al. (2007). "Advances in Magnesium Injection Molding (Thixomolding)". In K. U. Kainer. Magnesium: Proceedings of the 7th International Conference on Magnesium Alloys and Their Applications. Wiley-VCH. p. 252. ISBN 978-3-527-31764-6. http://books.google.com/books?id=WIGLNjp0MKMC&pg=PA252&dq=aj62+aj+alloys+magnesium&lr=&as_brr=3&ei=VcZ8SrP3LYnokAT22PiLCg#v=onepage&q=aj62%20aj%20alloys%20magnesium&f=false. 
2. ^ http://www.archivesmse.org/vol28_6/2865.pdf. MSE AJ62
3. ^ http://iweb.tms.org/Mg/magtech2002/018.pdf
4. ^ Helmut Kaufmann and Peter J. Uggowitzer (2007). Metallurgy and Processing of High-Integrity Light Metal Pressure Castings. Fachverlag Schiele & Schoen. p. 197. ISBN 978-3-7949-0754-0. http://books.google.com/books?id=Rdj05GwqHFgC&pg=PA197&dq=aj62+aj+alloys+magnesium&lr=&as_brr=3&ei=VcZ8SrP3LYnokAT22PiLCg#v=onepage&q=aj62%20aj%20alloys%20magnesium&f=false. 

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