| Title |
Pesearch Paper / Solidification : Lamellar Microstructure Control of Directionally Solidified Ti - 43Al - 3Si Alloy |
| Authors |
김승언(Seung Eon Kim),오명훈(Myung Hoon Oh),박노진(No Jin Park),이용태(Yong Tai Lee),산구정치(Masaharu Yamaguchi) |
| ISSN |
1738-8228(ISSN), 2288-8241(eISSN) |
| Abstract |
Directional solidification process of Ti-43Al-3Si alloy has been studied. DS ingots having rotated columnar grains with respect to longitudinal axis as well as fully lamellar microstructure parallel to longitudinal axis were successfully obtained using a polycrystalline seed material. Successful seeding and growing require plane-front solidification condition during the entire DS process. (101)⊥ND texture by pole figure measurement was found to be dominant in the DS ingot grown at a velocity of 5 ㎜/hr. Fracture toughness of the DS alloys was superiors to that of the PST alloys, with a value of K_Q = 21.7∼31.7 ㎫(ｍ)^½ for the crack arrest/divide orientation and K_Q = 7.4∼9.0 ㎫(ｍ)^½ for the brittle orientation. |