In Situ Study of γ-TiAl Lamellae Formation in Supersaturated α2-Ti3Al Grains

被引:11
|
作者
Cha, Limei [1 ,2 ]
Schmoelzer, Thomas [1 ]
Zhang, Zaoli [3 ]
Mayer, Svea [1 ]
Clemens, Helmut [1 ]
Staron, Peter [4 ]
Dehm, Gerhard [3 ,5 ]
机构
[1] Univ Leoben, Dept Phys Met & Mat Testing, A-8700 Leoben, Austria
[2] Mat Ctr Leoben Forsch GmbH, A-8700 Leoben, Austria
[3] Austrian Acad Sci, Erich Schmid Inst Mat Sci, A-8700 Leoben, Austria
[4] Helmholtz Zentrum Geesthacht, Inst Mat Res, D-21502 Geesthacht, Germany
[5] Univ Leoben, Dept Mat Phys, A-8700 Leoben, Austria
关键词
MICROSTRUCTURE; DIFFUSION;
D O I
10.1002/adem.201100272
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
In situ heating transmission electron microscopy (TEM) was used to investigate the initial stage of gamma-TiAl lamellae formation in an intermetallic Ti45Al7.5Nb alloy (in at.%). The material was heat treated and quenched in a non-equilibrium state to consist mainly of supersaturated, ordered a2-Ti3Al grains. Subsequently, specimens were annealed inside a TEM up to 750 degrees C. The in situ TEM study revealed that ultra-fine gamma-TiAl laths precipitate in the a2-matrix at approximate to 730 degrees C which exhibit the classical Blackburn orientation relationship, i.e. (0001 alpha 2//(111)gamma and [$11{\bar {2}}0$]alpha 2//<110]gamma. The microstructural development observed in the in situ TEM experiment is compared to results from conventional ex situ TEM studies. In order to investigate the precipitation behavior of the ?-phase with a complementary method, in situ high energy X-ray diffraction experiments were performed which confirmed the finding that gamma-laths start to precipitate at approximate to 730 degrees C from the supersaturated a2-matrix.
引用
收藏
页码:299 / 303
页数:5
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