Studi pengaruh temperatur anil dan persen deformasi terhadap sifat mekanik dan struktur mikro paduan al-4.5zn-1.5mg-0.9cr berat hasil squeeze casting dan canai dingin = Effect of annealing temperature and deformation on the mechanical properties and microstructure of al 4zn 1 5mg 0 9cr wt alloy fabricated by squeeze casting