Chapter The Structures of Alloys
Chapter Ⅲ The Structures of Alloys
33 1 Bas ic concepts of al loys I Definition An alloy is the combination of metal(s)with other elements through chemical bonding l. Terminology
§3.1 Basic concepts of alloys ◆ Ⅰ.Definition An alloy is the combination of metal(s) with other elements through chemical bonding. ◆ Ⅱ.Terminology
Alcohol Water ○- Liquid solution Mixing on the molecular scale Ni O H2O ●C2H3OH Cu
1. Component (or constituent) ◆ one component system e two component system binary system three component system ternary system four component system quarternary system ◆ five component system quinary system multi-component system
1. Component (or constituent) ◆ one component system ◆ two component system binary system ◆ three component system ternary system ◆ four component system quarternary system ◆ five component system quinary system multi-component system
2. Compo osition It can be expressed either by atomic percentage(mol fraction) Xa or by mass percentage Xm W/ m X:M ml ∑(Xm,/M) ∑(Xg9M/)
2. Composition It can be expressed either by atomic percentage (mol fraction) Xa or by mass percentage Xm = = n j j i X M W M X j i i 1 m m a ( ) = = n j j j i i i X M X M X 1 a a m ( )