Engineering Materials - Engineering Alloys.pptx

Engineering Materials - Alloys

1. Engineering Materials Subject / Alloys DR. ALTAYYEB KINHAR Shatt Al-Arab University College

2. • Alloys are combinations or mixtures of elements. A pure metal substance only has atoms of one specific type of metallic element, such as aluminium, gold, copper, lead, or zinc. • Metals made as alloys to improve on properties of pure metals such as hardness, strength, corrosion resistance, etc. • Ex.:- Steel: A material made of carbon and iron. Bronze: A mixture of the metals copper and tin Brass: A combination of zinc and copper 1 - Alloys

3. • An alloy system contains all the alloys that can be formed by several elements combined in all possible proportions. Binary Alloy System- If the system is made up of two elements it is called binary alloy system. Ternary Alloy System- If the system is made up of three elements it is called ternary alloy system. 1 - Alloys

4. 2- Different of Alloys and Pure Matels Alloys Pure Matels 1 Mixture of two or more metals Pure substance with basic form 2 melting point of these alloys is lower melting point of pure metals is extremely high 3 alloys are stronger and harder than pure metals. Metals are softer than alloys. 4 Alloys have lower thermal and electrical conductivities Matels have higher thermal and electrical conductivities 5 Alloys are more resistant to corrosion than pure metals Matels are less resistant to corrosion than alloys

5. 3- Classification of Alloys Alloys may be classified as 1- Pure Metals 2- Solid Solution 3- Compound or intermediate alloy phase