[AR] Re: New Al Alloy
- From: Nathan Mogk <nm8911@xxxxxxxxx>
- To: arocket@xxxxxxxxxxxxx
- Date: Wed, 30 Oct 2013 12:34:36 -0700
What interested me is not the slightly higher strength, but the fact that
it was higher strength on an alloy that is specifically intended to replace
6061. Whether that translates to rockets/tanks is yet to be seen on
specific properties. The release did mention wear resistance as a driving
requirement.
On Wed, Oct 30, 2013 at 12:10 PM, Jonathan Goff <jongoff@xxxxxxxxx> wrote:
> Nathan,
>
> There are already several alloys with more than 16.5% higher strength than
> 6061-T6. The questions for rocket stuff is thermal conductivity, solidus,
> high temperature strength, etc. Not just raw room-temperature strength. For
> instance 7068-T6 has a yield strength of almost 100ksi (vs ~40ksi for
> 6061), and has 190ish W/m*K thermal conductivity (compared to like 160ish
> W/m*K). But it's solidus is only something like 485C (compared to 560ish C
> for 6061), which means its high temperature strength/creep characteristics
> are probably quite a bit worse than 6061.
>
> If this is a 6xxx series alloy with good thermal conductivity, and similar
> solidus to 6061, it might be a good replacement. Ultimately, it would be
> interesting to see someone do a detailed thermal analysis of a rocket
> engine using some of the various potential aluminum alloys to see which
> combination of factors really matters most. I have some hunches, but not
> being actively in the rocket world anymore I don't really have the time to
> investigate.
>
> Would be really interested if someone wanted to do some sort of simplified
> analysis though and publish it on aRocket though!
>
> ~Jon
>
>
> On Wed, Oct 30, 2013 at 1:03 PM, Nathan Mogk <nm8911@xxxxxxxxx> wrote:
>
>> Apparently Alcoa recently unveiled a new alloy for use in truck wheels
>> that is 16.5% stronger than 6061. This may be an interesting alloy for
>> rockets when they let it into the market. There wasn't any real detail in
>> the press release that I saw, and they didn't mention (and I didn't look
>> up) what heat treatment of 6061 they are comparing with.
>>
>> Here is the press release
>>
>> http://www.asminternational.org/portal/site/www/NewsItem/?vgnextoid=3a23ccc1c26e1410VgnVCM100000621e010aRCRD
>>
>>
>>
>
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