Question

Which of the following metals are used as the matrix material in fibre reinforced MMCs?

I. Aluminium

II. Magnesium

III. Zinc

1. Only I and III
2. only I and II
3. only II and III
4. I, II and III

Answer 1

Correct Answer - Option 2 : only I and II

Explanation:

Metal matrix composites (MMCs):

• These are a kind of composite material in which rigid reinforcements are embedded in a ductile metal or alloy matrix. The reinforcements can be in the form of particle, short fibre, or continuous fibre. MMCs combine metallic properties like ductility and toughness with ceramic characteristics like hardness and modulus, leading to greater strength in shear and compression and to higher service temperature capabilities.

There are three types of MMCs based on the dispersed phase, and they are as follows:

1. Particulate MMCs
2. Short-fiber-reinforced MMCs
3. Continuous fibre-reinforced MMC

Particulate or short-fibre-reinforced MMCs are very common compared to continuous fibre-reinforced MMCs because they are relatively easy to manufacture.

Metals that are generally used for fibre reinforced MMCs are Aluminium and Magnesium. Zinc is not used for fibre reinforced MMCs