Aluminum Alloy for high temp engine service
Aluminum Alloy for high temp engine service
(OP)
Howdy metal fellas, I could use a point in the right direction. Been working on a similar post in Aerospace but thought materials might know a bit or two also.
I have an air cooled reciprocating engine head that was made from "Alcoa 142-t63/Bohn Y-2 Heat treat:30000 min tensile, 2-3% elongation, appx 70 brinell" in the early 1940's. I have the AMS spec sheet from 1955 for A142-t77.
Lists equivalents... the ones that I seem to find the most of are AMS4220 AMS4222. All of these specs have been cancelled.
In MIL-HDBK-5, AMS-A-21180 Casting (T7 temper), is the highest temp alloy I can find... it lists data at 350°F... not quite hot enough.
What would I make a 475°F max design temp cylinder head out of with all of the related alloys that I can find being cancelled?
I have an air cooled reciprocating engine head that was made from "Alcoa 142-t63/Bohn Y-2 Heat treat:30000 min tensile, 2-3% elongation, appx 70 brinell" in the early 1940's. I have the AMS spec sheet from 1955 for A142-t77.
Lists equivalents... the ones that I seem to find the most of are AMS4220 AMS4222. All of these specs have been cancelled.
In MIL-HDBK-5, AMS-A-21180 Casting (T7 temper), is the highest temp alloy I can find... it lists data at 350°F... not quite hot enough.
What would I make a 475°F max design temp cylinder head out of with all of the related alloys that I can find being cancelled?





RE: Aluminum Alloy for high temp engine service
I don't know of any aluminum alloys, wrought or cast, that have a safe service temp capability of 475degF. As you noted A201-T7 is a high-temp casting alloy, but it cannot be sand cast. There are some wrought alloys, such as 2219, that can endure brief exposure to 475degF, but long term exposure to this temp may result in creep.
Hope that helps.
Terry
RE: Aluminum Alloy for high temp engine service
RE: Aluminum Alloy for high temp engine service
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RE: Aluminum Alloy for high temp engine service