铝及铝合金与其它金属材料相比，具有以下一些特点：
Compared with other metal materials, aluminum and aluminum alloy have the following characteristics:
1、密度小
1. Low density
铝及铝合金的密度接近2.7g/,约为铁或铜的1/3。
The density of aluminum and aluminum alloy is close to 2.7 g / about 1 / 3 of that of iron or copper.
2、强度高
2. High strength
铝及铝合金的强度高。经过一定程度的冷加工可强化基体强度,部分牌号的铝合金还可以通过热处理进行强化处理。
Aluminum and aluminum alloy have high strength. The matrix strength can be strengthened by cold working to a certain extent, and some aluminum alloys can also be strengthened by heat treatment.
3、导电导热性好
3. Good conductivity and thermal conductivity
铝的导电导热性能仅次于银、铜和金。
The electrical and thermal conductivity of aluminum is second only to silver, copper and gold.
4、耐蚀性好
4. Good corrosion resistance
铝的表面易自然生产一层致密牢固的AL2O3保护膜，能很好的保护基体不受腐蚀。通过人工阳极氧化和着色，可获得良好铸造性能的铸造铝合金或加工塑性好的变形铝合金。
The surface of aluminum is easy to produce a dense and firm protective film of Al2O3, which can protect the substrate from corrosion. Through artificial anodizing and coloring, cast aluminum alloy with good casting performance or wrought aluminum alloy with good processing plasticity can be obtained.
5、易加工
5. Easy to process
添加一定的合金元素后，可获得良好铸造性能的铸造铝合金或加工塑性好的变形铝合金。
The casting aluminum alloy with good casting performance or deformation aluminum alloy with good processing plasticity can be obtained by adding certain alloy elements.