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This effect explains the hardness of alloys like brass (CuZn, which has the BCC structure), which are made by combining two soft metals (Cu and Zn, which are respectively FCC and HCP as pure metals, are both soft and ductile).
Malleability and Ductility: The electron-sea model of metals not only explains their electrical properties but their malleability and ductility as well. The sea of electrons surrounding the protons acts like a cushion, and so when the metal is hammered on, for instance, the overall composition of the structure of the metal is not harmed or changed.
7.3: Malleability of Metals and Alloys. Page ID. Chemistry 310. Penn State University via Wikibook. Metals with close-packed structures (HCP and FCC) such as copper, gold, silver, zinc, magnesium, etc. are in general more malleable than those with the BCC structure (tungsten, vanadium, chromium, etc.). Why?
MALLEABILITY AND DUCTILITY. Both these properties relate to the plasticity of the material. Malleability refers to the ability of plastic deformation under compressive loads, while ductility refers to plastic deformation under tensile loads. A malleable material can be beaten into thin sheets and even thinner foils.
12-co-ordination. Most metals are close packed - that is, they fit as many atoms as possible into the available volume. Each atom in the structure has 12 touching neighbours. Such a metal is described as 12-co-ordinated. Each atom has 6 other atoms touching it in each layer. There are also 3 atoms touching any particular atom in the layer above ...
Most metals are malleable – they can be bent and shaped without breaking. This is because they consist of layers of ions that can slide over one another when the metal is bent, hammered or...
Malleability and Ductility. Metal are able to deform under stress without cleave. The cloud of electrons surrounding the ions acts like a cushion, and so when the metal is hammered on, for instance, the overall composition of the structure of the metal is not harmed or changed.
