The FCC and BCC metals are more ductile than the HCP metals. This means that they can be stretched, which is one of the reasons why these two groups of metals are typically more flexible than the HCPs. The ductility is a result of their crystalline structure, where atoms in planes interact with each other to form bonds between them.
As a result, these metal types have an ordered arrangement that prevents it from breaking apart easily. In contrast, brittle metals like aluminum and zinc do not have this type of order because they are at high temperatures when they cool down after being molten-liquid states. They solidify into structures that do not allow for ductility, which means they are much more brittle.
Briefly explain why hcp metals are typically more brittle than fcc and bcc metals., HCPs do not have the same degree of order that causes ductility in FCCs or BCCs because, at high temperatures, their structures solidify into something different from what was there before. This makes them susceptible to breaking apart easily. Aluminum is a great example of this phenomenon because it has an extremely low melting point at 660°C (1220°F). In contrast, aluminum does not become fully molten until 800-900 °C (1472-1652°F) when it reacts with oxygen during decomposition by exothermic oxidation reactions; as such its