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How do metallic bonds help metals change shape without breaking?

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Diagram of a zinc-lead blast furnace system showing ore and coke entering through charge hoppers, with labeled furnace, air preheater, blower, taphole for slag and lead bullion, and a connected lead-splash condenser using rotors to separate and cool lead and zinc, with pathways for molten metals and off-gas. — metallurgy A zinc-lead blast furnace and lead-splash condenser. This technology is utilized mainly for producing zinc while managing both lead and zinc from raw materials, a technique that was highly influential in 20th-century smelting.

Metallic bonds allow metals to change shape without fracturing primarily due to the nondirectional nature of the binding force and the presence of nonlocalized valence electrons.12

In a metallic structure, atoms are arranged in a closely packed lattice of positive ions embedded in a "sea" of mobile, nonlocalized valence electrons. Unlike covalent bonds, which are rigid and directional, the metallic bond does not restrict the relative positions of the ions. When a metal is subjected to stress—such as hammering or drawing—the ions can easily slide past one another into new positions.132

The mobile valence electrons act as a flexible buffer between the positively charged ions. As the ions shift, these electrons rapidly migrate to neutralize the charges, preventing the ions from coming into direct contact with others of like charge, which would otherwise generate strong repulsive forces and cause the material to fracture. This combination of nondirectional bonding and electron mobility enables the high malleability and ductility characteristic of metals.134