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Properties of Metal

Materials and Processes

QuestionAnswer
Ability of a material to resist deformation & stress without breaking Strength
Tension - pulled Tensile strength
Resist deformation Yield strength
Opposing forces Shear strength
Crushing / compressing Bearing strength
Ability of a metal to resist cutting, penetration, or abrasion Hardness
Ability to be bent, formed or shaped without cracking Malleability
Ability to be drawn out into wire stock, extrusions, or rods Ductility
Materials tendency to break or shatter when exposed to stress (opposite of malleability & ductility) Brittleness
Property which enables a metal a carry heat or electricity Conductivity
Abiltiy to conduct heat Thermal conductivity
Ability to conduct electric current (allow electron to flow) Electrical conductivity
Property of a metal to expand when heated and shrink when cooled Thermal expansion
Tendency to return to its original shape after stretching or bending Elasticity
The point beyond which the metal does not return to its original shape after a deforming force is removed Elastic Limit
Ability to resist tearing or breaking when it is bent or stretched Toughness
Ability to be joined by heating Fusibility
Mass per unit volume compared to water (for solids) Density
Are formed by physically working the metal into shape Wrought objects
Are formed by pouring molten metal into molds Cast objects
Name two types of metal working processes. Wrought and cast
Name three ways to physically working metals. Hot working, cold working, and extrusion
Forming metals at an elevated temperature Hot working
Pressing Used to form large metal objects
Drop Forging Hammering while the metal is hot
Hammering Small parts, smith forging
Cold working is also known as Work Hardening or Strain Hardening
Performed well below the metals critical temperature, part must normally be heat treated after forming Cold working
Name three ways of cold working metal. Cold rolling, cold drawing, and/or pressing
Hot or cold, the metal is forced through a die which produces the desired shape, mostly on aluminum Extrusion
Contains no iron Non-ferrous metal