| Duralumin is an **aluminum alloy** that is **strong and lightweight**.
Here's a more detailed explanation
* **Duralumin** is an older term for **an aluminum alloy** that is known for its **high strength-to-weight ratio**. It typically contains **copper**, **magnesium**, **manganese**, and **silicon** in addition to aluminum.
* It was originally developed in Germany in the early 20th century and was widely used in **aircraft construction** due to its lightweight nature and strength.
* Today, the term "duralumin" is less common, and the specific alloys are often referred to by their **alloy designations**, such as **2024** or **7075**.
So, while not a commonly used term anymore, "duralumin" essentially means **"a strong and lightweight aluminum alloy."**
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