Which materials are typically utilized in the manufacturing of gears?

The manufacturing of gears primarily uses materials that can withstand significant mechanical stresses, provide durability, and maintain precise geometries. Steel is widely favored due to its strength, hardness, and the ability to be heat-treated for improved wear resistance. Aluminum offers a lightweight alternative with good mechanical properties, making it suitable for applications where weight reduction is essential. Plastic gears are utilized for lower-load applications due to their resistance to corrosion and reduced noise levels while operating. Composites combine various materials to achieve desirable properties such as high strength-to-weight ratios and improved fatigue resistance.

These characteristics make the selected answer the most appropriate choice among the options provided, as these materials align with the performance requirements typically desired in gear applications.