According to Forbes Aird's,
Racer's Encyclopedia of Metals, Fibers and Materials, Dilavar Ni13 is made up of:
13% nickel
5-6% manganese
3-4% chromium
+ dashes of other alloying metals.
Furthermore, "... exhibits a thermal coefficient of about 11.3 ppm - closely matching aluminum and magnesium. It has about the same density and elastic modulaus as other steels and, in the temper chosen by Porsche, it delivered a UTS up to 180ksi and a yield strength of at least 116ksi, with more than 12% elongation."
On paper, Dilavar looks to be a very tough material. Perhaps the problems with it in our engines has more to do with a lack of stringent manufacturing QC by Porsche's vendor(s) and/or by overlooked environmental issues (salt air, water corrosion, etc.), the reason why PAG tried various coatings to prevent/reduce breakage.
Let us know what you discover.
Regards,
Sherwood Lee
http://members.rennlist.org/911pcars