000132844 001__ 132844
000132844 005__ 20240315113108.0
000132844 0247_ $$2doi$$a10.1016/j.jallcom.2024.173783
000132844 0248_ $$2sideral$$a137726
000132844 037__ $$aART-2024-137726
000132844 041__ $$aeng
000132844 100__ $$aWang, Shunheng
000132844 245__ $$aOptimization of growth theory of the directionally solidified alumina based eutectic ceramics
000132844 260__ $$c2024
000132844 5203_ $$aDirectionally solidified Al2O3/Y3Al5O12 (YAG), Al2O3/YAG/ZrO2, Al2O3/GdAlO3 (GAP), Al2O3/GAP/ZrO2 and Al2O3/ZrO2 eutectic/non eutectic ceramics were prepared with laser zone melting. Their microstructure, phase component and shape were investigated. The results indicated that the molar ratio of Zr4+ to rare earth ions (Y3+, Gd3+) in the ZrO2 phase of the ternary eutectic was closed to 2:1. The free energy of chemical reaction was the key to determine the precipitation order of phase. The growth of the firstly-precipitated phase could be divided into the formation of ordered Bravais lattice composed by the oxygen ions, the diffusion of metal cations in this lattice and the change of phase morphology. The unfilled cation gap might be a fast channel for the ion transport. On the same growth plane, the nucleation of the later-precipitated phase began only after the firstly-precipitated phase was fully formed. The triangular was the main ion arrangement way for the stable nucleation and growth of phases. The effects of the precipitation temperature, the phase size, the eutectic type and the growth rate on the microstructure were discussed. This improved theory provided a more reasonable explanation for the formation of rod-shaped, layered, triangular, Chinese script (CS) and cellular microstructures, which might be of significance to regulate the morphology of microstructures.
000132844 536__ $$9info:eu-repo/grantAgreement/ES/MCINN/FEDER/PID2021-124863OB-I00
000132844 540__ $$9info:eu-repo/semantics/openAccess$$aAll rights reserved$$uhttp://www.europeana.eu/rights/rr-f/
000132844 655_4 $$ainfo:eu-repo/semantics/article$$vinfo:eu-repo/semantics/publishedVersion
000132844 700__ $$0(orcid)0000-0003-2242-6822$$aPeña, José Ignacio$$uUniversidad de Zaragoza
000132844 700__ $$aLun, Zhengyan
000132844 700__ $$aLiu, Juncheng
000132844 7102_ $$15001$$2065$$aUniversidad de Zaragoza$$bDpto. Ciencia Tecnol.Mater.Fl.$$cÁrea Cienc.Mater. Ingen.Metal.
000132844 773__ $$g982 (2024), 173783 [11 pp.]$$pJ. alloys compd.$$tJOURNAL OF ALLOYS AND COMPOUNDS$$x0925-8388
000132844 8564_ $$s10349178$$uhttps://zaguan.unizar.es/record/132844/files/texto_completo.pdf$$yVersión publicada
000132844 8564_ $$s2541556$$uhttps://zaguan.unizar.es/record/132844/files/texto_completo.jpg?subformat=icon$$xicon$$yVersión publicada
000132844 909CO $$ooai:zaguan.unizar.es:132844$$particulos$$pdriver
000132844 951__ $$a2024-03-15-08:51:02
000132844 980__ $$aARTICLE