Aloi Al-Mg
Ciri prestasi aloi aluminium Al-Mg ialah: sifat mekanikal yang baik pada suhu bilik; rintangan kakisan yang kuat; sifat tuangan yang lemah, turun naik yang besar dalam sifat mekanikal dan kesan ketebalan dinding; penggunaan jangka-panjang, keplastikan aloi akibat penurunan penuaan, malah keretakan berlaku dalam tuangan die; kecenderungan keretakan kakisan tegasan dalam tuangan die juga lebih besar. Kelemahan aloi Al-Mg mengimbangi sebahagian kelebihannya, menjadikannya terhad dalam penggunaan.
Aloi Al-Zn
Tuangan die aloi aluminium Al-Zn boleh memperoleh sifat mekanikal yang lebih tinggi selepas penuaan semula jadi. Apabila pecahan jisim zink lebih besar daripada 10 peratus, kekuatannya bertambah baik dengan ketara. Kelemahan aloi ini ialah rintangan kakisan yang lemah, kecenderungan kepada kakisan tegasan, dan mudah retak panas semasa tuangan die. Aloi Y401 yang biasa digunakan mempunyai kecairan yang baik dan mudah untuk mengisi rongga. Kelemahannya ialah ia mempunyai kecenderungan yang besar untuk membentuk liang, dan apabila kandungan silikon dan besi rendah, ia mudah retak panas.
Aloi Al-Si
Because Al-Si aluminum alloy has the characteristics of small crystallization temperature interval, large solidification latent heat of silicon phase in the alloy, large specific heat capacity, and relatively small linear shrinkage coefficient, its casting performance is generally better than other aluminum alloys. Its filling ability is also good, and the tendency of thermal cracking and shrinkage is relatively small. The Al-Si eutectic contains the least amount of brittle phase (silicon phase), and its mass fraction is only about 10 percent , so its plasticity is better than that of other aluminum alloy eutectic, and the remaining brittle phase can be further treated by modification. Improve plasticity. The test also shows that the Al-Si eutectic still maintains good plasticity at the temperature near its freezing point, which is not found in other aluminum alloys. There is often a considerable amount of eutectic in the cast alloy structure to ensure its good casting performance; the increase in the number of eutectic will make the alloy brittle and reduce the mechanical properties, there is a certain contradiction between the two. However, due to the good plasticity of Al-Si eutectic, it can better take into account the requirements of both mechanical properties and casting properties, so Al-Si alloy is currently the most widely used die-casting aluminum alloy.
