Threaded fastener and a method of making the same

摘要

A threaded fastener lighter in weight and easier to produce is formed by moderate temperature forging of a raw magnesium material that contains microcrystals whose diameter is about 100 µm or less. The raw material may be pure magnesium of industrial grade, any magnesium alloy, or such a composition as comprising as its matrix the alloy or pure magnesium. The raw material has a superplastic property and a fine-granulated metallographic internal texture, and, when forming the fastener, is heated to 250 - 400°C at which superplasticity takes place to facilitate forging.