07-26-2014, 10:00 AM
Ductility and Malleability
Ductility is the property that enables a material to stretch, bend or twist without cracking or breaking. This property makes it possible for a material to be drawn out into a thin wire.
In comparison, malleability is the property that enables a material to deform by compressive forces without developing defects. A malleable material is one that can be stamped, hammered, forged, pressed, or rolled into thin sheets.
Corrosion Resistance
Corrosion resistance, although not a mechanical property, is important in the discussion of metals.
Corrosion resistance is the property of a metal that gives it the ability to withstand attacks from atmospheric, chemical, or electrochemical conditions. Corrosion, sometimes called oxidation, is illustrated by the rusting of iron.
Table 1-2 lists four mechanical properties and the corrosion resistance of various metals or alloys. The first metal or alloy in each column exhibits the best characteristics of that property.
The last metal or alloy in each column exhibits the least. In the column labelled "Toughness," note that iron is not as tough as copper or nickel; however, it is tougher than magnesium, zinc, and aluminium. In the column labelled "Ductility," iron exhibits a reasonable amount of ductility; however, in the columns labelled "Malleability" and "Brittleness," it is last.
Ductility is the property that enables a material to stretch, bend or twist without cracking or breaking. This property makes it possible for a material to be drawn out into a thin wire.
In comparison, malleability is the property that enables a material to deform by compressive forces without developing defects. A malleable material is one that can be stamped, hammered, forged, pressed, or rolled into thin sheets.
Corrosion Resistance
Corrosion resistance, although not a mechanical property, is important in the discussion of metals.
Corrosion resistance is the property of a metal that gives it the ability to withstand attacks from atmospheric, chemical, or electrochemical conditions. Corrosion, sometimes called oxidation, is illustrated by the rusting of iron.
Table 1-2 lists four mechanical properties and the corrosion resistance of various metals or alloys. The first metal or alloy in each column exhibits the best characteristics of that property.
The last metal or alloy in each column exhibits the least. In the column labelled "Toughness," note that iron is not as tough as copper or nickel; however, it is tougher than magnesium, zinc, and aluminium. In the column labelled "Ductility," iron exhibits a reasonable amount of ductility; however, in the columns labelled "Malleability" and "Brittleness," it is last.