For HPDC there're some alloys which are commonly used, as: Silafont-38, Castasil 37 and 21, Magsimal 57 and Castaduct 42. Those alloys have interesting properties for engineering applications.
You can find the applications more detalied at: http://rheinfelden-alloys.eu/wp-content/uploads/2018/01/Handbook-Al-HPDC-Alloys-for-Structural-Casts_RHEINFELDEN-ALLOYS_2017_EN.pdf.