Need Aluminum Alloy to widthstand heat

[jjellin]

Is there and alloy with similar mechanical strength properties of 6061-T6 that can widthstand heat better than it. We use 6061-T6 to make a tool that holds devices in an oven. Typical thickness of the tool is about 1/2" and L X W is around 6" X 6". The 6061-T6 is warping. I'm still trying to find out the actual temperature and time that the tool is in the oven, but can anyone recommend a different alloy? Currently can't switch from aluminum, and redesign of the tool is also not an option.

Thanks

 

[Goahead]

Hi,
you may wish to research the properties of aluminum alloy 2618A also known as Hiduminium RR58,which was developed as a creep resistant material.

http://www.welding-advisers.com/

 

[kenvlach]

In addition to 2618, alloys 2218, 2219 and 4032 are used at higher temperatures.
thread330-61426 discusses an Al-2%Mn-2%Ni cast alloy known as Pyral which is used in Europe for stove burners, etc.

Alcoa (

http://www.millproducts-alcoa.com/)

has a cast tooling plate called MIC-6 for which it claims several advantages, including thermal stability: "Thermal Cycling can be performed up to 800° F under controlled conditions." I believe that MIC-6 is similar to Al 6061 in composition.

Please explain whether the problem is warping (distortion upon change of T) or creep (slow distortion under load at high T).

 

[jjellin]

Thanks for the responses. Unfortunately we may not be able to get a real clear awnser form our customer on how these parts warped.

I did find out however that the parts are placed in an over and slowed heated up to 250 C (482 F) and left for 72 hours. They are then left to cool to room temp for a day or so. Additionally these parts have been used for a couple years, and I'm guessing they were cycled once a week. Sounds to me more like a creep problem, but I'm no materials expert. Is there a way to tell by examining the parts (preferably without a microscope)?

Thanks again