
Interpretation:
The element which will provide the smallest reduction in electrical conductivity to the alloy is to be determined. Also, the element which will have unlimited solubility in aluminum is to be determined.
Concept Introduction:
A property of a substance known as solute whether it is solid, liquid, or gaseous to get dissolved in the solid, liquid or gaseous solvent is known as solubility.
When two or more solid chemical substances are dissolved in each other and only one phase appears after mixing irrespective of any concentration of the solute in the solvent, then there is unlimited solid solubility.
In alloying, the electrical conductivity of the alloy is dependent on the difference in the size of its constituent elements. Less is the difference in the sizes of the elements, higher is the electrical conductivity of the alloy which means, less is the reduction in the electrical conductivity of an alloy.
Hume-Rothery rules are the conditions which are to be satisfied to attain unlimited solid solubility. These rules are stated as:
1. The size of the atoms or the ions involved should be similar to minimize the lattice strain. This means that there should not be more than
2. The crystal structure of both the materials should be same to avoid different structure caused due to the transition from one phase to another phase at some point.
3. The difference in the valency of the ions causes the formation of compounds rather than solutions. Tus, the valence of the ions must be same.
4. The significant difference in the electronegativity (affinity for electrons) caused the compound formation rather than solutions. Therefore, the electronegativity of atoms must be approximately same.

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Chapter 10 Solutions
Essentials of Materials Science and Engineering, SI Edition
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