Author
T. Kumagai
Bio: T. Kumagai is an academic researcher. The author has contributed to research in topics: Crystallite & Grain size. The author has an hindex of 1, co-authored 1 publications receiving 15 citations.
Topics: Crystallite, Grain size, Grain boundary
Papers
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TL;DR: In this paper, the effect of microstructure on the room temperature tensile properties of polycrystalline Ti-49 and 51A1 alloys were investigated in vacuum, where aging in the γ single-and γ + α two-phase fields, followed by air cooling or controlled cooling (5K/min), results in three types of microstructures: type (I), equiaxed γ grain structure, type (II), γgrain structure with α 2 γ laths formed mainly at the ǫ grain boundaries, and type (
16 citations
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30 Mar 2012-Materials Science and Engineering A-structural Materials Properties Microstructure and Processing
TL;DR: In this paper, the phase transitions in the TiAl and the Ti-Al-C/TiAl systems are investigated by the differential thermal analysis (DTA) and X-ray diffraction (XRD).
Abstract: The phase transitions in the Ti–Al and the Ti–Al–C systems are investigated by the differential thermal analysis (DTA) and X-ray diffraction (XRD). The results reveal that the addition of C not only leads to the formation of the Ti 2 AlC phase but also lowers the formation temperatures of the TiAl and Ti 3 Al phases. In the both systems, the combustion synthesis reactions are ignited at the melting point of Al, so the TiAl alloy and the Ti 2 AlC/TiAl composites are successfully fabricated at a lower temperature (about 660 °C) with an applied pressure. The yield strength, the ultimate compression strength and the work hardening rate of the Ti 2 AlC/TiAl composites are all higher than those of the TiAl alloy and increase with the increase in the Ti 2 AlC content. The average ultimate compression strength of the 6 vol.% Ti 2 AlC/TiAl composite is 179 MPa higher than that of the TiAl alloy without sacrificing ductility.
41 citations
TL;DR: In this article, the effect of MoO 3 content on the microstructure and mechanical properties of (Ti,Mo)Al/Al 2 O 3 composites was investigated in detail.
38 citations
TL;DR: In this article, the effect of Mn atoms on the mechanical properties of the Ti2AlC/TiAl composites was investigated by experiments and first principles calculations, and the results showed that the addition of Mn remarkably improves the ductility of the composites.
32 citations
TL;DR: In this article, the effect of the (Nb-C) content on the compression properties and work-hardening behavior of the composites has been investigated and it was shown that the TiAl alloy improved remarkably with the addition of the Nb−C elements due to the formation of Ti 2 AlC particles and the solid solution of Nb in the Ti-Al matrix.
31 citations
TL;DR: In this paper, the phase transitions and reaction mechanisms at various annealing stages were investigated for microlaminated composite sheets consisting of alternating TiAl and carbide-layers.
21 citations