발간논문

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Vol.38, No.6, 779 ~ 785, 2000
Title
Pesearch Paper / Solidification : Lamellar Microstructure Control of Directionally Solidified Ti - 43Al - 3Si Alloy
김승언Seung Eon Kim,오명훈Myung Hoon Oh,박노진No Jin Park,이용태Yong Tai Lee,산구정치Masaharu Yamaguchi
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.
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