Classify each of the following statements as true or false:...

Classify each of the following statements as true or false:
(a) Intermetallic compounds have a fixed composition.
(b) Copper is the majority component in both brass and bronze.
(c) In stainless steel the chromium atoms occupy interstitial positions.

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Key Concepts

Intermetallic Compounds

Intermetallic compounds are alloys where the constituent elements combine in fixed (or nearly fixed) stoichiometric ratios, producing an ordered crystal structure that is distinct from a random solid solution. This fixed composition leads to unique physical and chemical properties compared to the pure elements or typical substitutional alloys.

Alloy Composition and Classification (Brass and Bronze)

Alloys are mixtures of two or more elements where one element usually constitutes the majority and forms the base matrix. Brass and bronze are classified as copper-based alloys—brass being a copper-zinc alloy and bronze a copper-tin alloy—where typically copper is the predominant component, although the exact proportions can vary based on the desired characteristics.

Substitutional vs. Interstitial Positions in Alloys

In alloy systems, the manner in which atoms are accommodated in the crystal lattice is crucial. In substitutional alloys, the alloying atoms replace some of the host atoms in the lattice, as is the case with chromium atoms in stainless steel, while interstitial alloys are formed when smaller atoms occupy the spaces (interstices) between the larger host atoms. This difference significantly affects the material's properties, such as its strength and corrosion resistance.

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