التفاصيل البيبلوغرافية
| العنوان: |
Formation and characterization of an Al‐rich metastable phase in the Al–B phase diagram. |
| المؤلفون: |
Malkin, Alexander I.1 (AUTHOR), Chernyshev, Vladimir V.1,2 (AUTHOR), Ryazantseva, Alena A.1 (AUTHOR), Vasiliev, Alexander L.3,4 (AUTHOR), Nickolsky, Maximilian S.5 (AUTHOR), Shiryaev, Andrei A.1 (AUTHOR) a_shiryaev@mail.ru |
| المصدر: |
Journal of Applied Crystallography. Aug2021, Vol. 54 Issue 4, p1121-1126. 6p. |
| مصطلحات موضوعية: |
*PHASE diagrams, *X-ray powder diffraction, *ALLOY powders, *CHEMICAL formulas, *PHASE equilibrium, *HEAT treatment |
| مستخلص: |
Vacuum heat treatment of mechanically alloyed powders of boron and aluminium leads to the formation of a metastable Al‐rich phase, which can be quenched. Its structure, composition and thermal stability are established. With the chemical formula Al1.28B the rhombohedral phase is unusually rich in Al. The parameters of the unit cell determined from X‐ray powder diffraction are a = 18.3464 (19), c = 8.9241 (9) Å, V = 2601.3 (6) Å3, space group R3. It is stable on heating to 630°C. It is suggested that this phase is an important intermediate step in the formation of AlB2 and, eventually, of other borides; its nucleation and thermal stability are explained by high elastic energy hindering the formation of equilibrium phases at low temperatures. [ABSTRACT FROM AUTHOR] |
| قاعدة البيانات: |
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