Why fcc more ductile than hcp

The alpha phase is called ferrite. At high temperatures, FCC and BCC structured metals both have mobile dislocations, and thus they can sustain large plastic deformations without undergoing fracture. This is because their symmetry provides closely packed planes in several directions.

A face-centered cubic crystal structure will exhibit more ductility deform more readily under load before breaking than a body-centered cubic structure. The bcc lattice, although cubic, is not closely packed and forms strong metals.

Zinc is HCP and is difficult to bend without breaking, unlike copper. Many other features depend upon the crystal structure of metals, such as density, deformation processes, alloying behavior, and much more.

Answer: Alloys such as medium and high carbon steel, cast iron and tool steel are brittle. Metals like gold, copper, lead and silver are the opposite — ductile. You are mistaken to imply that FCC metals do not undergo a transition from brittle to ductile behavior. The cross slips in hexagonal close-packed HCP metals are not easy because the slip planes do not intersect.

Diamond is the hardest material known, while cubic boron nitride BN is the second-hardest. Silicon carbide SiC is very structurally complex and has at least 70 crystalline forms. The hexagonal closest packed hcp has a coordination number of 12 and contains 6 atoms per unit cell. 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. This makes them susceptible to breaking apart easily. Save my name, email, and website in this browser for the next time I comment. News Troy. The Advantages of Game-Based Learning.

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