This magnesium alloy has similar high-temperature strength to AM-SC1 ® and has been specially tailored for use in the high pressure diecasting process. Like AM-SC1, the light-weight alloy significantly increases fuel-efficiency, environmental sustainability and vehicle agility and is suitable for the powertrain components of vehicles, such as engines, structural sumps and transmission housings.

Diecasting is already the main manufacturing process for aluminium engine blocks in Europe and South-East Asia and is gaining momentum in North America. It is also the key process for manufacturing transmission housings and other similar powertrain components. Recognising this trend, AMT has developed AM-HP2 ® in collaboration with its research partner CAST. The new magnesium alloy exhibits excellent diecastability and has the required high-temperature mechanical properties for engine components (including engine blocks) and automatic transmission housings.

AM-HP2 offers several advantages over its competitors. It is more diecastable than other high temperature creep resistant magnesium alloys and thus can be more readily cast into complex shapes with fewer rejects and a wider operating window, providing for a more robust manufacturing process. It also has the best high temperature creep strength of all commercial creep resistant magnesium diecasting alloys. The alloy is of significant benefit to engine designers seeking maximum performance for the lowest weight.

Commercial Opportunities for AM-HP2 ®

High pressure diecasting is a highly productive process for mass production of light alloy components.  While the casting integrity of sand casting and low pressure/gravity permanent mould castings is higher than high pressure diecasting, the latter technology is cheaper.  Thus, this process is gaining popularity among auto manufacturers in North America and is the predominant process in Europe and South East Asia for casting of aluminium engine blocks.  It is also the common process for other powertrain components such as transmission housings.  There is a strong demand in the automotive industry for a suitable high pressure diecasting magnesium alloy for high volume powertrain applications.  AMT has recognised this need and, based upon the success of its AM-SC1 alloy, has worked with CAST on the development of a new diecasting alloy, AM-HP2. This alloy exhibits good diecastability and the required high temperature mechanical properties for engine components (including engine blocks) and automatic transmission housings. It has similar creep properties to it's sister alloy, AM-SC1.

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What is AM-HP2 ®

AM-HP2 has been specifically developed as a diecasting alloy for high temperature automotive powertrain applications, such as engine blocks, structural sumps and automatic transmission housings.  The alloy is based upon the successful sand casting alloy, AM-SC1, with a modified composition to make it suitable for the high pressure die casting process.

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Advantages of AM-HP2 ®

A key advantage of AM-HP2 is that the alloy is more diecastable than competitor high temperature creep resistant magnesium alloys.  Thus, the alloy can be more readily cast into complex shapes with fewer rejects and a wider operating window.  The alloy also has better high temperature creep strength than its competitors and thus offers considerable advantage to engine designers seeking to obtain maximum performance for lowest weight and cost.

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Current Status

Pilot scale diecasting trials and laboratory testing of mechanical properties have demonstrated the suitability of AM-HP2 for mass produced powertrain components.  The alloy is now entering a phase of industrial scale trialling with potential automotive customers.

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