Which alloy is known for its high strength and light weight, but is highly corrosive and a fire hazard?

• A. Steel
• B. Aluminium alloy
• C. Magnesium alloy
• D. Titanium alloy

Answer: (C)

The correct answer is the magnesium alloy. Magnesium alloys are recognized for their exceptional strength-to-weight ratio, making them popular in aerospace and automotive applications where reducing weight is critical. However, they are prone to corrosion, particularly in harsh environments, and can be highly flammable. This characteristic makes them a fire hazard if not handled properly, especially when exposed to high heat or sparks.

In contrast, steel is generally heavier and known for its strength, but it does not possess the same strength-to-weight advantage as magnesium. Aluminium alloys, while also lightweight and corrosion-resistant, typically do not reach the same level of strength as magnesium alloys. Titanium alloys are known for their excellent strength and corrosion resistance, but they are heavier and more expensive compared to magnesium alloys. Understanding these properties is crucial for selecting the appropriate materials for specific aviation applications.