RE: [ATM] Why not metal mirrors? (was Beryllium)

["lou krajci" <loukrajci@comcast.net>]

>From: Mark Holm [mailto:mdholm@telerama.com]

>Advantages of, some, metals:

<....>

>Disadvantages of metals:

>Polycrystalline  This is a big problem....

>Hard to get isotropic, especially in large sizes.  This has to do with
>crystallizing taking preferred orientations as the melt cools....

If crystalline structure is a problem...what about Amorphous Metals?:
http://www.darpa.mil/dso/thrust/matdev/sam.htm
and
http://www.lanl.gov/orgs/mst/cms/research/researchMABAA.html (start at
section that reads:  "Bulk Amorphous Alloys")

Are these materials too expensive, and not yet easily available for the ATM?

Thanks in advance.

Tom Krajci
Albuquerque, New Mexico
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