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Select any two from (i), (ii) or (iii) below and explain the difference between the terms in each: (i) Solid solution alloy and partial solubility alloy; (ii) Crystalline and amorphous solid structures; (iii) Eutectic and eutectoid transformations. - Leaving Cert Engineering - Question c - 2021
Question c
Select any two from (i), (ii) or (iii) below and explain the difference between the terms in each: (i) Solid solution alloy and partial solubility alloy; (ii) Crys... show full transcript
Worked Solution & Example Answer:Select any two from (i), (ii) or (iii) below and explain the difference between the terms in each: (i) Solid solution alloy and partial solubility alloy; (ii) Crystalline and amorphous solid structures; (iii) Eutectic and eutectoid transformations. - Leaving Cert Engineering - Question c - 2021
Step 1
Solid solution alloy and partial solubility alloy;
Answer
In a Solid Solution Alloy, the two metals are completely soluble in each other in all three states: solid, liquid, and gas. This means that they can mix uniformly at the atomic level without forming different phases or compounds. The phase diagram for such an alloy will show a continuous range of compositions.
In contrast, a Partial Solubility Alloy allows for the two metals to be completely soluble only in the liquid phase. In the solid state, they can only dissolve in limited amounts, leading to a mixture of two different solid phases. This limited solubility is illustrated by the Solvus Lines in a phase diagram.
Step 2
Crystalline and amorphous solid structures;
Answer
Crystalline Structures have regular, geometric, and repeating molecular patterns. These patterns can be structured into various lattice systems such as BCC, FCC, or CPH, leading to distinct melting points and mechanical properties.
Amorphous Structures, however, lack this long-range order. Their atoms are arranged irregularly, and they do not have a defined geometric structure. Common examples include glasses and gels, which display different thermal and mechanical behavior compared to crystalline materials.