Module 3 :
Lecture 13 : METALLIC ALLOYS
 


Alloy Classification:

Ferrous Alloy:

  • High Strength Low Alloy Steels(Fe+C+Niobium),
  • Medium Alloy Nickel-Chromium Steels,
  • Manganese Steels,
  • High resisting Steels etc.

Nonferrous Alloy:

  • Light Alloys like Aluminium, Magnesium, Titanium & Zinc Alloys
  • Heavy Alloys like Copper, Nickel & Cobalt Alloys

Aluminum Alloy

Pure Aluminium is weak, light & ductile, density 2.7 Mg/m3, E – 70GPa, Strength 45-150 Mpa.

T (heat Treated)3003 – Aluminium –Manganese alloy – a wrought alloy in which dispersion hardening takes place due to Al-Mn Intermetallic Compounds; Strength can go up to 310 Mpa; Used for Kitchen Utensils, Tubing, Corrugated Sheet; often small Magnesium is added for additional strengthening for use in Coke Cans

T5454 Aluminium & Magnesium Alloys, another wrought alloy used for welded applications like liquid Tanks & Pressure Vessels

T5182 used for Can cover
All of them have excellent corrosion resistance and can be used for Marine Environments. Aluminium – Silicon alloy is one of the most popular Cast alloy, light weight but shrink heavily, with 11.6% Silicon eutectic mixture is possible, used in Gear Boxes, Radiators and such thin walled complex geometry