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Phase Equilibria in the Al-Cr-Co System in the Range of Compositions 0-70 at.% Al
Journal of Phase Equilibria and Diffusion ( IF 1.4 ) Pub Date : 2021-02-03 , DOI: 10.1007/s11669-021-00864-2
K. Ye Korniyenko , L. S. Kriklya , V. M. Petyukh , I. B Tikhonova , V. B. Sobolev , A. V. Samelyuk

Phase equilibria during solidification in the Al-Cr-Co system in the range of compositions 0-70 at.% Al were studied using optical microscopy, scanning electron microscopy, electron probe microanalysis, differential thermal analysis and x-ray diffraction. Solidus and liquidus surfaces, a melting diagram as their superposition, a Scheil diagram for solidification, as well as series of isopleths were constructed for the first time. Solid solutions based on Cr, αCo, Cr5Al83 and γ1 phases), CoAl, Co2Al5 binary compounds and the ternary compound τ5 take part in phase equilibria. The monoclinic ternary compound τ5 forms by peritectic reaction L + γ1 + Co2Al5 ↔ τ5 at 1065 °C. Four invariant four–phase reactions and one invariant three–phase reaction involving liquid take place at 1280, 1175, 1110, 1065 and about 1480 °C, respectively. Isopleths 10, 20, 30 and 40 at.% Al as well as 40 at.% Cr demonstrate peculiarities of the phase diagram.



中文翻译:

Al-Cr-Co体系中0-70 at。%Al成分范围内的相平衡

使用光学显微镜,扫描电子显微镜,电子探针显微分析,差热分析和x射线衍射研究了Al-Cr-Co系统在凝固过程中Al含量在0-70 at。%Al范围内的相平衡。首次构造了固相线和液相线表面,作为其叠加的熔化图,用于固化的Scheil图以及一系列等值线。基于Cr,αCo,铬固溶体5的Al 8(γ 3和γ 1相),煤,钴2的Al 5种二元化合物和τ三元化合物5在相平衡取一部分。单斜晶系三元化合物τ 5由包晶反应L +γ形式1 +共2的Al 5 ↔τ 5在1065℃。涉及液体的四个不变的四相反应和一个不变的三相反应分别在1280、1175、1110、1065和1480°C下发生。等当量10、20、30和40 at。%Al和40 at。%Cr证明了相图的特殊性。

更新日期:2021-02-03
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