Journal Article

PUBDB-2017-14129

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Influence of alloy composition and thermal history on carbide precipitation in γ-based TiAl alloys

Wang, L. (Corresponding author)HZG* ; Lorenz, U.HZG* ; Münch, M. ; Stark, A.HZG* ; Pyczak, F.HZG*

2017
Elsevier Science Amsterdam [u.a.]

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Please use a persistent id in citations: doi:10.1016/j.intermet.2017.05.006  doi:10.3204/PUBDB-2017-14129

Abstract: Carbide precipitation in TiAl alloys with different alloying element additions and thermal history was investigated by transmission electron microscopy and high energy X-ray diffraction. The results reveal that Nb addition in TiAl alloys does not increase the carbon solubility in the γ matrix significantly. With increasing carbon concentration in the alloys, a splitting of the P-type carbides takes place earlier in the course of ageing at 800 °C and the formation of H-type carbides is promoted. For a nearly single γ phase alloy Ti-51Al-5Nb-0.5C, H-type carbides are the thermodynamically stable phase. However, with decreasing Al concentration, P-type carbides become thermodynamically stable at low carbon concentration (below 1%) in Ti-45Al and Ti-45Al-5Nb alloys. It is feasible to achieve high thermodynamical stability of the P-type carbides in TiAl alloys through controlling alloying elements.

Note: © Elsevier Ltd.

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Contributing Institute(s):

1. Zentrum für Material- und Küstenforschung (HZG)
2. DOOR-User (DOOR)

Research Program(s):

1. 6G3 - PETRA III (POF3-622) (POF3-622)

Experiment(s):

1. DORIS Beamline W2 (DORIS III)
2. PETRA Beamline P07 (PETRA III)

Appears in the scientific report 2017

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Database coverage:
; ; Current Contents - Engineering, Computing and Technology ; Current Contents - Physical, Chemical and Earth Sciences ; Ebsco Academic Search ; IF < 5 ; JCR ; SCOPUS ; Science Citation Index ; Science Citation Index Expanded ; Thomson Reuters Master Journal List ; Web of Science Core Collection

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