2017年
Porous Ti-Al Intermetallic Based Alloys Fabricated by Pressure-Sintering Elemental Powders with a Space holder Powder
MRS ADVANCES
- ,
- ,
- 巻
- 2
- 号
- 26
- 開始ページ
- 1387
- 終了ページ
- 1392
- 記述言語
- 英語
- 掲載種別
- 研究論文(学術雑誌)
- DOI
- 10.1557/adv.2017.123
- 出版者・発行元
- CAMBRIDGE UNIV PRESS
In the present study, we have attempted to produce the porous Ti-Al intermetallic based alloys by pressure-sintering of the elemental powders of Ti and Al through a combustion reaction, with a NaCl space holder to achieve the development of a highly porous structure. The powders of Ti (particle size: <45 pm) and Al (particle size: <45 pm) were mixed to various total compositions of Ti-0-40 Al (at.%), and NaCl (particle size: 300-400 mu m) was mixed with the Ti/Al powder to give a highly porous structure. The mixed powder was sintered at 700 degrees C: under a constant pressure of 30 MPa to form cylindrical specimens with a diameter of 20 mm. The soaking of the specimens in pure water allows for the removal of NaCl (with a volume fraction of 60 %) and the formation of the pores to achieve a controlled relative density of 0.4. The present process can produce porous Ti Al alloys with various compositions. In as-sintered Ti-AI specimens, an inhomogeneous microstructure consisting of Ti particles surrounded by the a Ti Al alloy layer (various Ti-Al intermetallic phases) was observed. The as-sintered specimens exhibited the brittle behavior under compression, which is independent of their Al content. However, in a Ti-20Al alloy heat-treated at 1300 degrees C, a nearly Ti3Al single-phase microstructure appeared in the porous specimen. The heat-treated porous Ti-20Al alloy shows both a high plateau-strength level of approximately 100 MPa and a high plateau-end strain over 50%, resulting in a high absorption energy. The present results demonstrate that controlling the microstructure for the formation of the Ti(3)AI single-phase would he an effective method to achieve high energy absorption capacity of the porous Ti Al alloy.
- リンク情報
- ID情報
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- DOI : 10.1557/adv.2017.123
- ISSN : 2059-8521
- Web of Science ID : WOS:000412747600004