In the Late Classic Period Yaxchilan was one of the most powerful Maya cities along the course of the Usumacinta, with Piedras Negras as its major rival. Architectural styles in subordinate sites in the Usumacinta region demonstrate clear differences that mark a clear boundary between the two kingdoms.
Answered by The Community. Making the world better, one answer at a time. Steel is not usually considered a composite, as it is macroscopically homogeneous. However, some steel types, including classical iron-carbon steel, can be considered as metal-matrix composites, as they contain a second phase... sometimes.
Steel is a purified alloy of iron with carbon which is manufactured in the liquid state. The manufacturing process eliminates almost all of the phosphorus, sulfur, and silicon which exist in common cast iron. The range of carbon content for steels is 0.1 to 1.5%. Low carbon steels (<0.2% carbon) are called mild steels.