The alloy that cultivators talked about was not just a combination of many metals, but a combination of materials. They mixed beast bones and other materials together to make a new shape of material. Strictly speaking, this new material could not be called an alloy, but a composite material.
Although this composite material could reach the standard of high-grade materials in some aspects, it was absolutely impossible to say that it could replace high-grade materials.
However, even though these composite materials could not replace high-grade materials, Zhao Hai knew that as long as they were used properly, it would not be a problem to use these materials to make great magic weapons.