Question
This transition begins at a namesake “start” temperature and is done at a colder, “finish” temperature. For 10 points each:
[10m] Name this phase transition, usually triggered by rapid quenching, in which a material with a face-centered cubic structure is converted to a body-centered tetragonal structure. It is named for the very strong but brittle phase it produces.
ANSWER: martensitic transformation [or the martensite transformation; accept answers describing the transition from austenite to martensite]
[10e] The transformation from austenite to martensite is most well-characterized in this material. Chromium is often added to make this material resistant to corrosion.
ANSWER: steel [accept stainless steel]
[10h] The martensitic transformation is described by this adjective, meaning it occurs due to a coordinated displacement, without any long-range motion of individual atoms.
ANSWER: diffusionless [accept answers indicating there is no diffusion or it occurs without diffusion; prompt on displacive]
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Summary
| 2023 BHSU @ Berkeley | 03/18/2023 | Y | 3 | 10.00 | 100% | 0% | 0% |
| 2023 BHSU @ Maryland | 03/11/2023 | Y | 3 | 10.00 | 100% | 0% | 0% |
| 2023 BHSU @ Northwestern | 02/25/2023 | Y | 6 | 21.67 | 100% | 100% | 17% |
| 2023 BHSU Online | 04/15/2023 | Y | 4 | 12.50 | 100% | 25% | 0% |
| 2023 BHSU @ Sheffield | 04/15/2023 | Y | 2 | 20.00 | 100% | 50% | 50% |
| 2023 BHSU @ Waterloo | 04/15/2023 | Y | 3 | 10.00 | 100% | 0% | 0% |
| 2023 BHSU @ Yale | 04/08/2023 | Y | 3 | 16.67 | 100% | 67% | 0% |
Data
| What is BH! And you are asking me? BHSU | Cornell C++ | 0 | 10 | 0 | 10 |
| Cornell B- | Houston and Friends | 10 | 10 | 0 | 20 |
| Rollin in from Sturgis, The Cheyne Gang | Hutto Hippos | 0 | 10 | 0 | 10 |
| Dr. Christopher Manners, MD – Samarra, Iraq | The Enrique Trastamara Military Academy B | 0 | 10 | 0 | 10 |