| Title |
Research Papers / Transformations : Microstructural Study of Ti Aluminide Multilayered Sheets Fabricated by Hot Rolling Part 1 : Formation Behavior of Intermetallic Phases |
| Authors |
오진근(Jin Keun Oh),이원철(W. C. Lee),박우진(Woo Jin Park),이성학(Sung Hak Lee),김낙준(Nack J. Kim) |
| ISSN |
1738-8228(ISSN), 2288-8241(eISSN) |
| Abstract |
The objective of this study is to analyze microstructures of multilayered Ti aluminide sheets fabricated by self-propagating high-temperature synthesis(SHS) reaction using hot rolling. Multilayered Ti/Al sheets were prepared by stacking thin Ti and Al sheets alternatively, and had a good Ti/Al interfacial bonding after pre-rolling at 500℃. When these sheets were heat-treated at 1000℃, spheroidal TiAl_3 phases were formed by SHS reaction at Ti/Al interfaces and inside Al layers. This formation continued until Al was completely consumed, and the Ti/Al multilayers turned into the Ti/TiAl_3 multilayers. Microstructural analysis on the hot-rolled, multilayered Ti/TiAl_3 sheets indicated that intermetallic phases such as TiAl_2, TiAl, and Ti_3Al were formed at Ti/TiAl_3 interfaces due to interaction between Ti and TiAl_3, and that pores formed in TiAl_3 layers were significantly reduced during hot rolling. These findings suggested that the SHS reaction using hot rolling was economical and useful for the continuous fabrication of the multilayered Ti/Ti aluminide sheets. |