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Because brass is an alloy of copper & zinc - the zinc atoms change the geometry of the copper crystals - making it less flexible.

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When a bimetallic bar made of copper and iron strips is heated the bar bends toward the iron strip. The reason for this is?

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explain why a metal bar made up of two strips, one of steel and another of brass bend when heated?

An example; if the metal bar, made up of 2 steel and brass strips, is heated the strips will also heat up. Each material’s coefficient of thermal expansion varies, which indicates how much a material is affected by heat. :Steel has lesser coefficient of thermal expansion than brass. While warming the bar, the brass strip elongates more than the steel strip because of a higher coefficient of its thermal expansion. When the two strips are attached one next to another, the expansion at the two ends differs and this bends the bar. The brass strip expands more than the steel strip will hence exert force on the steel strip and expands it outwards. This creates a bend in the bar, the brass strip moves out more than the steel strip as shown in Fig. When the bar will be cold, strips will also contract and bar will go back to the first position and so on. However, heating and bending the bar can cause significant stresses in the material including deformations that can lead to prolonged changes within the properties of the material and failure over time.