Acta Metall Sin  1997, Vol. 33 Issue (7): 677-682    DOI:

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MORPHOLOGIES OF (Al,Ag)_3Ti AND Ti_3AlC PRECIPITATES IN Ll_0-TiAl INTERMETALLIC COMPOUND

TIAN Wenhuai;YANG Haichun (Universily of Science and Technology Beijing; Beij ing 100083); NEMOTO Minoru (Kyushu University; Japan)

TIAN Wenhuai;YANG Haichun (Universily of Science and Technology Beijing; Beij ing 100083); NEMOTO Minoru (Kyushu University; Japan). MORPHOLOGIES OF (Al,Ag)_3Ti AND Ti_3AlC PRECIPITATES IN Ll_0-TiAl INTERMETALLIC COMPOUND. Acta Metall Sin, 1997, 33(7): 677-682.

Abstract References Related Articles Recommended Metrics Download:  PDF(1630KB)  Export:  BibTeX | EndNote (RIS)       Abstract  A trasmission electron microscopy (TEM) investigation has been performed on the moerphologies of Ll2-(Al,Ag),Ti and Ti3AIC precipitates in Ll0-ordered TiAl(Ag). During aging at temperatures around 1073 K after quenching from 1473 K, TiAl(Ag) hardens by the precipitation of (Al,Ag)3Ti and Ti3AIC. TEM observations revealed that plate-like precipitates (Al,Ag)3Ti lie on (001) plane of TiAl(Ag) matrix and needle--like pricipitates Ti3AlC, which lie only in one direction parallel to the [001] axis of the TiAl(Ag) matrix, appear after longer period aging or higher temperature aging. The anisotropic misfits between TiAl matrix and Ll2-(Al,Ag)3Ti and Ti3AIC can be considered to explain the morphologies of (Ag,Al)3Ti and Ti3AIC precipitates. Key words:  intermetallic      TiAl      precipitation      age-hardening      Received:  18 July 1997      Service E-mail this article Add to citation manager E-mail Alert RSS （） Articles by authors URL:  https://www.ams.org.cn/EN/     OR     https://www.ams.org.cn/EN/Y1997/V33/I7/677 1 Kim Y W,DimidukDM.In:HosoiY,YoshlnagaH,Oikawa H,Maruyama K eds,Aspects of High Temperature De formation and Fracture in Crystalline Materials, Proc 7th JIM Int Symp, TheJapan Institute of Metals,Sendal,1993:373 2 DahmsM,Seeger J,SmarslyW,Wildhagen B.ISIJ Int,1991;31:1093 3结城 勇,天野宪 鱼住 稔,乾 晴行,山口正治.日本金属学会志,1994;58:564 4Mabuchi H,Hirukawa K,KatayamaK,TsudaH,Nakayama Y.Scr Metall Mater ,1990224:1553 5田文怀,原田浩介,中岛玲司,佐野毅,根本 .日本金属学会志1993;57:1235 6Tian W H,sano T,Nemoto M.Phils Mag 1993;A68:965 7 Keily A, Nlchoson R B. In: Churners B ed, Progress In Malerlals Science, Vol.10, Oxford:Pergamollg 1963: 149 8von Hornbogen E, Roth M. Z Metallk, 1967; 58: 842 9Loomls W T, Freeman J W, Sponseller D J. 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