Guessing here, but maybe you are looking for Titanium-Nickel
alloy (TiNi)?

If I remember correctly that is what the bows are made of on
my glasses. You can bend them almost 90 deg and they will
spring back to their original shape. Here is some info from
a research project I found:

===
"Tensile Properties and Transformation Temperatures of Ti-Ni
Alloy Dental Castings Added Cu

Hisashi Doi, Equo Kobayashi, Takayuki Yoneyama and Hitoshi
Hamanaka

Department of Metallurgy, Division of Biomaterials,
Institute of Biomaterials and Bioengineering, Tokyo Medical
and Dental University
(2-3-10, Kanda-Surugadai, Chiyoda-ku, Tokyo 101-0062)
Original Paper: J J Dent Mate Vol. 20 No. 1 48-53 (2001)
Keyword: Titanium-nickel alloy, Superelasticity, Mechanical
properties

The application of the Ti-Ni base alloy to dentistry is
expected to utilize its shape memory effect and
super-elasticity properties. The transformation temperature
changes when part of the nickel in a Ti-Ni alloy is replaced
with copper. In this study, the super-elastic property of
Ti-Ni alloy in which part of the nickel was replaced with
10mol% of copper was investigated, and the application of
this alloy to dental casting was also examined. The results
of this study showed that the super-elasticity of dental
casted Ti-Ni-Cu alloy with 10mol% of replacement copper was
good and that this maybe a useful method of reducing the
quantity of nickel in Ti-Ni based alloy."
===

From Mat-world:

Titanium Nickel Alloy
TiNi Alloy
Ti-Ni (50:50 wt%)
Ingots, Wires, Sputtering Target, Sheet, Plate, Disk

http://www.mat-world.com/En_elements/ti.html

Maybe this is the stuff you are looking for or could use...

--
Leon Fisk
Grand Rapids MI/Zone 5b
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