👉 Alloy pimples, also known as intermetallic or eutectoid structures, are microscopic, spherical or elongated inclusions that form within metallic alloys during solidification. They occur when specific alloy compositions and cooling rates lead to the simultaneous precipitation of two or more different metals at a lower temperature, creating distinct, often spherical, regions within the alloy matrix. These pimples are typically found in body-centered cubic (BCC) and face-centered cubic (FCC) alloys, such as steel, and can significantly affect the mechanical properties of the material, often increasing hardness and strength but potentially reducing ductility.
