De or het aluminiumlegering?

The correct Dutch article is:

de aluminiumlegering

Rule Words ending in -ing: almost always de. See the rule

How to use aluminiumlegering

the aluminiumlegeringde aluminiumlegering
this aluminiumlegeringdeze aluminiumlegering
that aluminiumlegeringdie aluminiumlegering
our aluminiumlegeringonze aluminiumlegering
your aluminiumlegeringjouw aluminiumlegering
every aluminiumlegeringelke aluminiumlegering
which aluminiumlegering?welke aluminiumlegering?
a big aluminiumlegering / the big aluminiumlegeringeen grote aluminiumlegering, de grote aluminiumlegering