Abstract
We have successfully prepared a new high pressure die-casting (HPDC) Mg-RE based alloy possessing excellent heat resistance. The alloy exhibits a tensile strength of 229 MPa at 200 °C, the highest tensile strength among HPDC Mg alloys reported so far, even competing with A380 aluminum alloy. Moreover, it has a minimum creep rate of 1.76 × 10−10 s−1 which is one order of magnitude smaller than the well-known HPDC AE44 alloy at 200 °C/70 MPa. Such superior elevated temperature strength and creep resistance are associated with fine-grained structure, co-segregation of Y and Zn atoms as well as coherent long period stacking ordered (LPSO) phase with networking distribution. This newly developed alloy gives a promising outlook for HPDC Mg alloys in automotive powertrain components.
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