What are some alternative materials to aluminum?

Alternative materials to aluminum include magnesium, which is lighter and often used in automotive and aerospace applications; titanium, known for its strength and corrosion resistance, though more expensive; copper, utilized for its excellent electrical conductivity; and steel, which is stronger and more durable but heavier. Additionally, composite materials like carbon fiber and fiberglass offer weight savings and high strength, though they can be more complex to manufacture. Each alternative has its own set of advantages and disadvantages depending on the specific application and requirements.