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HomeKey Engineering MaterialsKey Engineering Materials Vols. 230-232Structural Changes and Thermal Stability of...

Structural Changes and Thermal Stability of Mechanically Alloyed Ti-Al Powders with Additions of Mn and Nb

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Advanced Materials Forum I

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Periodical:

Key Engineering Materials (Volumes 230-232)

Pages:

130-135

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.230-232.130

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Online since:

October 2002

Authors:

L. Lu, F. Zhang, M.O. Lai

Keywords:

Alloying Additions, Intermetallic, Mechanical Alloying (MA), Thermal Stability, TiAl

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© 2002 Trans Tech Publications Ltd. All Rights Reserved

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[1017] 10 A. Tonejec and A. Bondfacic: Scipta Metall., 3 (1969), 145. 30 40 50 60 70 80 90 (f) Ti-58Al Ball Milled 20 hrs (e) Ball Milled 15 hrs (d) Ball Milled 10 hrs (b) Ball Milled 5 hrs (a) Ball Milled 1 hr Diffraction Angle (2 Theta) Intensity (A.U.) Al Ti Mn Amorphous phase Nb X (c) Ball Milled 7.5 hrs � � � � fcc-like phase � X X X X X X Figure 1. XRD spectra of powders after different durations of ball milling. 100 900800700600500400 200 0 300 (a) Ball Milling for 1 hour (c) Ball Milling for 15 hours (b) Ball Milling for 7.5 hours Decomposition of hydrides Decomposition of hydrides Reaction Reaction Crystallization Melting of Al Temperature (degree C) Exothermic Fig. 4. DTA curves of samples milled for different times. 30 40 50 60 70 80 90 (a) 1 hour Milling, 900C (b) 5 hours Milling, 900C/1hr (c) 15 hours Milling, 900C Diffraction Angle (2 Theta) Intensity (A.U.) � � � � � � � � �� TiAl � Ti2AlN � � � � � �� Al3Ti Ti3Al � Fig. 3 XRD patterns of annealed samples.