TY - JOUR
T1 - APFIM study of βand γ microduplex TiAl intermetallic alloy
AU - Masahashi, N.
AU - Mizuhara, Y.
N1 - Funding Information:
This research work was supported by the 'Atomic Arrangement Design and Control Project' which is a collaborative research project between the University of Cambridge and the Research Development Corporation of Japan. The authors are grateful to Professor Colin Humphreys and HKDH Bhadeshia for the provision of laboratory facilities, and Professor Michio Ya-mazaki and Dr Hiroshi Harada for support of this project. The authors would also like to thank Dr Alas-dair Preston and Dr J6rg Wiezorek for electron microscope observations and discussions.
PY - 1997/2/28
Y1 - 1997/2/28
N2 - β and γ microduplex TiAl intermetallic alloy prepared by thermomechanical processing was characterized by atom prove field ion microscope (APFIM) in atomic level. TEM-SAD observation revealed B2 ordering in the β-phase, while its ordering is expected to be not so high from its composition analysis result and the high temperature deformation mechanism of this alloy. The compositions for each phase determined by APFIM are in good agreement with those determined by TEM-EDX other than the Cr distribution in the β-phase. However, Cr site occupancy was not determined in the γ-phase due to a failure in analyzing the ladder diagram probably caused by this materials intrinsic evaporation behavior. Small amounts of ions probably due to oxygen were detected in β not in γ, providing a speculation of oxygen scavenging from the γ-phase. Hydrides were detected in both the γ- and β-phase.
AB - β and γ microduplex TiAl intermetallic alloy prepared by thermomechanical processing was characterized by atom prove field ion microscope (APFIM) in atomic level. TEM-SAD observation revealed B2 ordering in the β-phase, while its ordering is expected to be not so high from its composition analysis result and the high temperature deformation mechanism of this alloy. The compositions for each phase determined by APFIM are in good agreement with those determined by TEM-EDX other than the Cr distribution in the β-phase. However, Cr site occupancy was not determined in the γ-phase due to a failure in analyzing the ladder diagram probably caused by this materials intrinsic evaporation behavior. Small amounts of ions probably due to oxygen were detected in β not in γ, providing a speculation of oxygen scavenging from the γ-phase. Hydrides were detected in both the γ- and β-phase.
KW - APFIM
KW - Microduplex TiAl intermetallic alloy
KW - Titanium aluminides
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U2 - 10.1016/s0921-5093(96)10471-8
DO - 10.1016/s0921-5093(96)10471-8
M3 - Article
AN - SCOPUS:0041725309
VL - 223
SP - 29
EP - 35
JO - Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing
JF - Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing
SN - 0921-5093
IS - 1-2
ER -