Subject: Which metal in bimetallic strip expands/contracts more when heated/cooled?

A bimetallic strip is made up of two different
metal strips , iron  and brass , welded or riveted together.So when it is 
heated , which of the metal expands more ? And when it is cooled , which of 
the metal contracts more ? Are iron and brass the only metals used in 
making the bimetallic strip ? How about other metals ?
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Re: Which metal in bimetallic strip expands/contracts more when heated/cooled?