Because of this historical link, the unknown substance composing the shield is sometimes referred to as "Proto-Adamantium". MacLain's attempts to duplicate the shield, minus Wakandan Vibranium and the mystery factor, resulted in True Adamantium. įDR presents the shield to Captain America
Later, the shield was presented to Captain America by President Franklin Delano Roosevelt. government painted in its familiar red-white-and-blue pattern using titanium oxide paint (though it has been repainted since then). Presumably, the titanium steel bolts used to fasten straps to the disc were also forged at this time. MacLain chose the discus shape because of its versatility, while others say that he used an existing cast designed for tank hatches. The alloy was poured into the shape of a disc. The shield was awarded to Captain America by the government several months after the beginning of his career. MacLain was never able to duplicate the process due to his inability to identify a still unknown factor that played a role in it.
During his experiments, MacLain combined Vibranium with an iron alloy he was working with and created the disc-shaped shield. While the doctor was asleep, as a result of his exhaustion, an unknown factor caused the metals he was working with to bond. The doctor worked tirelessly, using a steel alloy (now known as Proto-Adamantium), and an unknown metal (now known to be Vibranium or more precisely Wakandan Vibranium). MacLain was hoping the alloy would provide a distinct advantage in the armor of American war machines, during World War II. He was attempting to perfect an indestructible alloy as strong as the legendary Adamantine, which Hercules' Golden Mace was made from. government to create an impenetrable substance to use for tanks during World War II. 4.2 Alternate Realities' Shield WieldersĪmerican metallurgist Dr.3 Other Shields Used by Captain America.