Al-Mg aloi
Nodweddion perfformiad aloi alwminiwm Al-Mg yw: priodweddau mecanyddol da ar dymheredd ystafell; ymwrthedd cyrydiad cryf; eiddo castio gwael, amrywiadau mawr mewn eiddo mecanyddol ac effeithiau trwch wal; defnydd tymor hir, plastigrwydd yr aloi oherwydd gostyngiad heneiddio, ac mae hyd yn oed cracio yn digwydd mewn castiau marw; mae tueddiad cracio cyrydiad straen mewn castiau marw hefyd yn fwy. Roedd anfanteision Al-Mg aloi yn rhannol wrthbwyso ei fanteision, gan ei gwneud yn gyfyngedig o ran cymhwysiad.
Al-Zn aloi
Al-Gall castiau marw aloi alwminiwm Zn gael priodweddau mecanyddol uwch ar ôl heneiddio'n naturiol. Pan fo'r ffracsiwn màs o sinc yn fwy na 10 y cant, mae'r cryfder yn gwella'n sylweddol. Anfantais yr aloi hwn yw ymwrthedd cyrydiad gwael, tueddiad i gyrydiad straen, a chracio poeth hawdd yn ystod castio marw. Mae gan yr aloi Y401 a ddefnyddir yn gyffredin hylifedd da ac mae'n hawdd llenwi'r ceudod. Yr anfantais yw bod ganddo dueddiad mawr i ffurfio pores, a phan fo'r cynnwys silicon a haearn yn isel, mae'n hawdd cael ei gracio'n boeth.
Al-Si aloi
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.
