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Which is harder: zinc or aluminium?

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In your case, the properties of Zinc and Aluminium alloys are roughly in the same ballpark, therefore a general statement is not possible. In general, you rarely use pure metals for engineering applications. read more

Assuming you speak of the hardness of the material and not the stretch. It will depend on the grade of aluminium you are looking at. Depending on how the aluminium was made or the components added to it, the aluminium can either be softer or harder than zinc. read more

Chrome finish amplifies every defect in a part, which makes Zinc much easier to finish compared to Aluminum. Zinc die casts can be easily polished, plated, painted, chromated or anodized. Tough durability Zinc alloys are some of the strongest and toughest materials for die casting. read more

If we’re talking about PURE aluminum vs PURE copper, pure aluminum is harder than pure copper. I’m not sure exactly what kind of alloy is used for a star. But I’m guessing that, since pure metals have better thermal (and electrical) conductivity than alloys, the aluminum is probably pretty soft, albeit not as soft as copper. read more

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