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LINKEDIN DISCUSSION
Heat-Treated Aluminum Alloy in HPDC
On the Metal
Casting Design and Purchasing Network on LinkedIn, a member asked: “Does anyone have recomendations for a high pressure die casting (HPDC) aluminum alloy to be heat treated?” Members responded:
“It is not an alloy problem; it is the amount of entrained gases in the metal, which expand during heat treatment and cause blistering. Depending on the part size, you may want to try a vacuum value in the die and/or high pressure squeeze casting using a vertial shot. The squeeze casting die is fi lled at a much slower rate, allowing the air to exit the die and not mix into the metal. Alloys such as A356 can be cast in this method with good heat treat properties achieved.”—Paul Mikkola, PPM Consulting and Design LLC
“AlSi7Mg type materials can be very CONNECT WITH US Like:
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successful in HPDC for heat treating purposes. One thing to watch for is distortion caused by quenching after solution heat treatment. This can be minimized by air quenching rather than using a liquid quench media, if part geometry allows. Depending on the fi nal properties you require there are some alloys on the market such as Magsimal, which don’t require heat treatment at all or only a low tem- perature aging.”—Martyn Hill, Caparo Foundry & Forging Europe
Editor’s Note: MCDP does not necessarily endorse the views expressed in the LinkedIn discussion. Read more on our LinkedIn Group, Metal Casting Design and Purchasing.
Jul/Aug 2012 | METAL CASTING DESIGN & PURCHASING | 3
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