1.铝可以部分代替铁的领域主要是汽车外壳与轮毂，航空航天，部分建材，列车车厢(主要是高铁车厢)，一些硬质合金，当然还有别的领域，共同点既要要求强度，同时还要要求轻量化，耐腐蚀，而后面这些要求金属铁做不到(部分产品需要使用镁或锌)

1. The main areas in which aluminum can partially replace iron are automotive casings and wheels, aerospace, some building materials, train carriages (mainly high-speed rail carriages), some hard alloys, and of course, there are other fields that require both strength and lightweight, corrosion resistance, which cannot be achieved by metal iron (some products require the use of magnesium or zinc)

　　2.铝可以部分代替铜的领域主要是涉及输电线路和电路当中，原因与铜的密度过大有关。但导电性能还可以接受，如果铝的导电能力能达到铜的90%，铜有可能在绝大部分线路和电路上看不到身影，银更不可能看到，直接在关键部分直接用铜即可。

The field where aluminum can partially replace copper mainly involves transmission lines and circuits, due to the high density of copper. But the conductivity is still acceptable. If the conductivity of aluminum can reach 90% of that of copper, copper may not be visible in most circuits and circuits, let alone silver. Copper can be directly used in key parts.

　　3.铝还有一些领域是很多金属无法胜任的，主要是用于制作切割材料，刚玉主要用于切割加工领域，可以切部分比较坚硬的金属，只有少数几种无法切割加工，原因是比较废，也可以用于制作耐火材料，发挥作用的是铝的氧化物刚玉，这种氧化物不溶于酸碱，而且还耐高温。

3. Aluminum also has some fields that many metals cannot handle, mainly used for making cutting materials. Corundum is mainly used for cutting and processing, and can cut some relatively hard metals. Only a few types cannot be cut and processed because they are relatively waste. It can also be used to make fire-resistant materials, and aluminum oxide corundum plays a role. This oxide is insoluble in acid and alkali, and also resistant to high temperatures.

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