Question
Brian Cantor led a team that developed one of these materials consisting of an equal mixture of five first row transition metals. For 10 points each:
[10e] Name these materials said to be “high-entropy” or “multi-component” when they contain at least five different metals. More common two-component examples of these materials include bronze.
ANSWER: alloys [accept high-entropy alloys or multi-component alloys]
[10h] The Cantor alloy undergoes a phase separation into metallic and intermetallic phases, an example of a decomposition described by this term. The zero set of the second derivative of Gibbs free energy with respect to composition percentage defines a curve described by this term.
ANSWER: spinodal [accept spinodal decomposition or spinodal curve]
[10m] The “sluggish diffusion” effect in high-entropy alloys results from unequal lattice potential energies around the “vacancy” type of these sites. Other types of these sites may be classified as “substitutional” or “interstitial.”
ANSWER: point defects [or crystallographic point defects; accept vacancy defects or substitutional defects or interstitial defects]
<Arizona State, Physics>
Summary
| Florida | 2025-02-01 | Y | 3 | 13.33 | 100% | 33% | 0% |
| Great Lakes | 2025-02-01 | Y | 6 | 11.67 | 100% | 17% | 0% |
| Lower Mid-Atlantic | 2025-02-01 | Y | 6 | 11.67 | 100% | 17% | 0% |
| Midwest | 2025-02-01 | Y | 2 | 20.00 | 100% | 50% | 50% |
| North | 2025-02-01 | Y | 3 | 10.00 | 100% | 0% | 0% |
| Northeast | 2025-02-01 | Y | 5 | 20.00 | 100% | 60% | 40% |
| Overflow | 2025-02-01 | Y | 5 | 16.00 | 100% | 40% | 20% |
| Pacific Northwest | 2025-02-01 | Y | 2 | 15.00 | 100% | 50% | 0% |
| Southeast | 2025-02-01 | Y | 4 | 15.00 | 100% | 50% | 0% |
| UK | 2025-02-01 | Y | 10 | 12.00 | 100% | 20% | 0% |
| Upper Mid-Atlantic | 2025-02-01 | Y | 7 | 15.71 | 100% | 29% | 29% |
| Upstate NY | 2025-02-01 | Y | 3 | 13.33 | 100% | 33% | 0% |