硅对硬质合金有腐蚀作用。虽然一般将超过12%Si的铝合金称为高硅铝合金，推荐使用金刚石刀具，但这不是绝对的，硅含量逐渐增多对刀具的破坏力也逐渐加大。因此有些厂商在硅含量超过8%时就推荐使用金刚石刀具。
Silicon has a corrosive effect on cemented carbide. Although the aluminum alloy with more than 12% Si is generally called high silicon aluminum alloy, and diamond cutting tools are recommended, this is not absolute. With the gradual increase of silicon content, the destructive force of cutting tools is also gradually increased. Therefore, some manufacturers recommend using diamond tools when the silicon content exceeds 8%.
硅含量在8%-12%之间的铝合金是一个过渡区间，既可以使用普通硬质合金，也可以使用金刚石刀具。但使用硬质合金应使用经PVD(物理镀层)方法、不含铝元素的、膜层厚度较小的刀具。因为PVD方法和小的膜层厚度使刀具保持较锋利的切削刃成为可能(否则为避免膜层在刃口处异常长大需要对刃口进行足够的钝化，切铝合金就会不够锋利)，而膜层材料含铝可能使刀片膜层与工件材料发生亲合作用而破坏膜层与刀具基体的结合。因为超硬镀层多为铝、氮、钛三者的化合物，可能会因硬质合金基体随膜层剥落时少量剥落造成崩刃。
Aluminum alloy with silicon content between 8% - 12% is a transition zone. Both ordinary cemented carbide and diamond tools can be used. However, when using cemented carbide, tools with PVD (physical coating) method, no aluminum element and small film thickness shall be used. Because the PVD method and small film thickness make it possible for the tool to maintain a sharp cutting edge (otherwise, in order to avoid the abnormal growth of the film at the edge, the edge needs to be passivated enough, and the cutting aluminum alloy will not be sharp enough), and the aluminum content of the film material may cause the affinity between the blade film and the workpiece material and destroy the combination between the film and the tool matrix. Because the superhard coating is mostly a compound of aluminum, nitrogen and titanium, it may cause edge collapse due to a small amount of peeling off of cemented carbide matrix with the film.
建议使用下列三类刀具之一：
One of the following three types of tools is recommended:
1.不镀层的超细颗粒硬质合金刀具
1. Uncoated ultra-fine particle cemented carbide tools
2.带未含铝镀层(PVD)方法的硬质合金刀具，如镀TiN、TiC等
2. Cemented carbide tools with non aluminized coating (PVD) method, such as tin plating, tic plating, etc
3.用金刚石刀具
3. Use diamond tools
刀具的容屑空间要大，一般建议用2齿，前角、后角要大(如12°-14°，包括端齿后角)。
The chip holding space of the tool should be large. Generally, it is recommended to use 2 teeth, and the front angle and rear angle should be large (such as 12 ° - 14 °, including the rear angle of the end teeth).
如果只是一般铣面，可以用45°主偏角的可转位面铣刀，配用专门加工铝合金的刀片，应该效果更好。

If it is only a general milling surface, the indexable surface milling cutter with 45 ° main deflection angle can be used, and the effect should be better when equipped with a blade specially processing aluminum alloy.
氧化铝在1808年在实验室利用电解还成为铝材，于1884年即被作为建筑材料使用在美国华盛顿纪念碑尖顶上至今；铝材加入各种金属元素合成的铝合金材料已被建筑工业广泛应用在各环节上。 铝合金常用板材厚度:高级金属屋面(和幕墙)系统的一般为0.8-1.2mm(而传统的一般要≥2.5mm).
Alumina was electrolyzed in the laboratory in 1808 and became aluminum material. It was used as a building material on the spire of the Washington Monument in 1884; Aluminum alloy materials synthesized by adding various metal elements have been widely used in various links in the construction industry. Thickness of commonly used aluminum alloy plate: the thickness of advanced metal roof (and curtain wall) system is generally 0.8-1.2mm (while the traditional is generally ≥ 2.5mm)