Duralumin is an alloy of

Options

A. Al and Mg
B. Mg and Cu
C. AI, Mg, Mn and Cu
D. Al and Cu

Explanation

**Step-by-Step Solution:**

1. **Understanding Duralumin**: Duralumin is a type of alloy known for its strength and lightweight properties. It is primarily used in aerospace and automotive applications due to these characteristics.

2. **Composition of Duralumin**: The main components of Duralumin are:
- **Aluminium**: 90-94%
- **Copper**: 4%
- **Magnesium**: 1%
- **Manganese**: 0.5-1%

3. **Identifying the Correct Components**: From the composition, we can see that Duralumin consists of:
- Aluminium (the major component)
- Copper (a significant alloying element)
- Magnesium (contributes to strength)
- Manganese (helps improve corrosion resistance)

4. **Evaluating the Options**: The question provides several options regarding the components of Duralumin:
- Option 1: Aluminium and Magnesium
- Option 2: Magnesium and Copper
- Option 3: Aluminium, Magnesium, and Copper
- Option 4: Aluminium and Copper

5. **Selecting the Best Option**: Since Duralumin contains Aluminium, Copper, Magnesium, and Manganese in varying amounts, the most comprehensive option that includes the key components is:
- **Option 3: Aluminium, Magnesium, and Copper**.

6. **Conclusion**: Therefore, Duralumin is an alloy primarily made of Aluminium, with significant contributions from Copper, Magnesium, and Manganese.

**Final Answer**: Duralumin is an alloy of Aluminium, Copper, Magnesium, and Manganese.

---