Hi Harish!
There are future scopes of material science and metallurgy. I can classify it for you :-
In the next 10-15 years we will move from silicon age to nano age where particles having size of nanometers range will be developed. It is a field not only studied by material scientists but also electronic engineers, chemical engineers and biotechnology engineers.
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Multifunctional Materials
Conventional materials like metals, ceramics and polymers are modified and designed such that they can change their properties with the change in environment. For example, shape memory alloys, piezoelectric materials, superconductive materials.
These materials use two or more phases to provide a combined enhanced and desired properties at low strength to weight ratios.
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Extractive Metallurgy and Energy Engineering
Fuels required to extract to obtain metals are exhausting. Thus, these scientists find ways to obtain metals at efficiency with minimum energy consumption.
In this field of study, people are finding ways to improve the properties of materials by proper control microstructures of materials.
Other fields under material science and metallurgy include the following :-
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Nuclear Metals
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Powder Metallurgy
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Thin Films
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Metallic Glasses
Hope this helps you find the best field for yourself.
All the best!