FCC and HCP have the same atomic packing density but the former has many more ea

Question

FCC and HCP have the same atomic packing density but the former has many more easy slip systems. Thus, FCC materials have larger ductility than HCP materials in general.

True ______ or False ______

For a dislocation, a normal stress is to drive it to slide.

True ______ or False ______

Two similar elements in terms of atomic radius, crystal structure, electronegativity and valence, have a high mutual solubility in each other.

True ______ or False ______

Ionic materials are characterized with larger Burgers vectors because of the requirement of charge neutrality.

True ______ or False ______

For polycrystalline materials, each individual grain is a single crystal.

True ______ or False ______

Explanation / Answer

Ans true

Fcc metals are more ductile than hcp metallic structures. Hcp structures have 2 types of planes whereas fcc has 3 types of planes. Cubic lattice structures allow more slippage than non cubic latice structures so fcc structures are more ductile.

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