称作杜拉铝、超杜拉铝、杜拉柳明等名称的铝合金都是属于下述成分范围内的: Cu 3—5％ Fe< 0.8％ Mg 0.3—2％ Mn 0.3—1.5％ Si 0.2—1.5％虽然一般的标准划分这些合金基本上是按机械性能进行的,但从金相的观点来看,按其硬化组分来划分是比较好的。根据几乎完全能够控制显微组织的Mg—Si比,可划分成为三个组: 1、Mg:Si>1.73,强化组分是Mg_2Cu_2AI_5,带有或不带有CuAl_2。 2、Mg:Si=1.73,强化组分是Mg_2S Aluminum alloys known as Duralumin, Duraluminum, Duraulimin belong to the following compositional ranges: Cu 3-5% Fe <0.8% Mg 0.3-2% Mn 0.3-1.5% Si 0.2-1.5% Although the general standard division of these alloys is basically based on mechanical properties, but from the metallographic point of view, according to its hardening component to divide is better. According to the Mg-Si ratio, which can control the microstructure almost completely, it can be divided into three groups: 1, Mg: Si> 1.73, and the strengthening component is Mg_2Cu_2AI_5, with or without CuAl_2. 2, Mg: Si = 1.73, and the strengthening component is Mg_2S