TiAl2: A reentrant phase in the TiAl system
作者： A. Loiseau , C. Vannuffel
关键词: High resolution electron microscopy 、 Chemistry 、 Long period 、 Crystallography
摘要: The domain of stability and the structures TiAl2 phases are studied by conventional high resolution electron microscopy. Like Ti1+xAl3−x LPAPB structures, ordered on a f.c.c. lattice present along cube axis (c axis) long period modulation which is composition and/or conservative antiphase boundaries (APB) modulation. In case phases, fixed such that stacking sequence (001) atomic planes is: TiAl, Al. On this an APB superimposed determines relative positions Ti atoms in successive TiAl planes. It shown latter temperature dependent, according to very particular scheme: first structure TiAl2I stable two different ranges – one at low (T 1250 °C). between, other structure, TiAl2II, stabilized its periodicity twice TiAl2I. Owing striking feature, then reentrant structure. Mittels konventioneller und hochauflosender Elektronenmikroskopie werden der Stabilitatsbereich die Strukturen TiAl2-Phasen untersucht. Wie bei den Ti1+xAl3−x-LPAPB-Strukturen sind einem k.f.z.-Gitter geordnet zeigen Richtung einer kubsichen Achse (c-Achse) eine langperiodische Modulation, Zusammensetzungsmodulation und/oder konservative Antiphasengrenzen(APB)-Modulation darstellt. Im Falle ist Modulation Zusammensetzung fixiert so, das Stapelfolge (001)-Atomebenen: Al ist. Auf dieser APB-Modulation uberlagert, Lage Ti-Atome sukzessiven TiAl-Ebenen bestimmt. Es wird gezeigt, Periode letzteren temperaturabhangig ist, entsprechend sehr speziellen Schema: erste Struktur stabil zwei verschiedenen Temperaturbereichen niedrigen Temperaturen Dazwischen andere Struktur, TiAl2II seine Periodizitat zweimal von Infolge deutlichen Hinweise TiAl2I-Struktur dann reentrante Struktur.
harvard.edu
sci-hub.se 参考文章(15)
Walter Selke, Modulated Structures in a Simple Ising Model Springer, Dordrecht. pp. 23- 42 ,(1984) , 10.1007/978-94-009-6195-1_2
Debard Evelyne, Thèse de doctorat d'Etat Geobios. ,vol. 21, pp. 261- ,(1988) , 10.1016/S0016-6995(88)80026-3
Konrad Schubert, Kristallstrukturen zweikomponentiger Phasen Springer Berlin Heidelberg. ,(1964) , 10.1007/978-3-642-94904-3
Rokuro Miida, Satoshi Hashimoto, Denjiro Watanabe, New Type of A 5 B 3 Structure in Al-Ti and Ga-Ti Systems; Al 5 Ti 3 and Ga 5 Ti 3 Japanese Journal of Applied Physics. ,vol. 21, ,(1982) , 10.1143/JJAP.21.L59
D. de Fontaine, J. Kulik, Overview no. 40 Application of the ANNNI model to long-period superstructures Acta Metallurgica. ,vol. 33, pp. 145- 165 ,(1985) , 10.1016/0001-6160(85)90133-6
G. van Tendeloo, S. Amelinckx, Long‐period antiphase boundary structures in the ordered alloy Au4Zn. I. One‐dimensional long‐period antiphase boundary structure Physica Status Solidi (a). ,vol. 43, pp. 553- 564 ,(1977) , 10.1002/PSSA.2210430224
D. Schryvers, G. Van Tendeloo, J. Van Landuyt, S. Amelinckx, High-resolution study of the one- and two-dimensional long-period antiphase boundary structures in Au4Zn Physica Status Solidi (a). ,vol. 75, pp. 607- 616 ,(1983) , 10.1002/PSSA.2210750235
Y. Fujino, H. Sato, M. Hirabayashi, E. Aoyagi, Y. Koyama, In situ observation of commensuration process of long-period superlattice in the Ag-Mg alloys. Physical Review Letters. ,vol. 58, pp. 1012- 1015 ,(1987) , 10.1103/PHYSREVLETT.58.1012
Rokuro Miida, Masaki Kasahara, Denjiro Watanabe, Long-Period Antiphase Domain Structures of Al-Ti Alloys near Composition Al3Ti Japanese Journal of Applied Physics. ,vol. 19, ,(1980) , 10.1143/JJAP.19.L707
Rokuro Miida, One-Dimensional Antiphase Domain Structures in the Aluminum-Rich Al-Ti Alloys Japanese Journal of Applied Physics. ,vol. 25, pp. 1815- 1824 ,(1986) , 10.1143/JJAP.25.1815