| Autor: |
Svitlana Ilyenko, T. Ya. Velikanova, L. V. Artyukh |
| Rok vydání: |
1998 |
| Předmět: |
|
| Zdroj: |
Journal of Alloys and Compounds. 269:193-200 |
| ISSN: |
0925-8388 |
| DOI: |
10.1016/s0925-8388(98)00244-8 |
| Popis: |
The phase equilibria in the Sc–Zr–C system were investigated for the first time using metallography, differential thermal analysis (DTA), X-ray powder patterns (XRD), and electron probe microanalysis (EPMA). The projections of the solidus and liquidus surfaces were constructed. A continuous solid solution was found to form between isomorphous (NaCl-type) carbides of scandium and zirconium. As the thermodynamically most stable phase, the δ-NaCl-type phase is in equilibrium with all the phases that exist at subsolidus temperatures. The microhardness of this phase at the carbon-rich boundary of the homogeneity range decreases monotonously from 2970 kg mm −2 for ZrC 1− x to 1100 kg mm −2 for ScC 1− x . There are two four-phase incongruent-type equilibria with participation of the liquid phase: L+δ+β-Sc 4 C 3 ⇄Sc 3 C 4 (1810°C) and L+δ⇄Sc 3 C 4 +C (1737°C). |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect