Effect of Ultrasonic Melt Treatment on Solidification Microstructure of Al?5Ti?1B Alloy Containing Numerous Inoculant Particles

Soo‑Bae Kim; Jae‑Gil Jung; Young‑Hee Cho; Su‑Hyeon Kim; Kwangjun Euh; Jung‑Moo Lee

doi:10.1007/s12540-021-01061-z

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자료유형: 학술저널

저자정보: Soo‑Bae Kim (Korean Institute of Material Science) Jae‑Gil Jung (Korean Institute of Material Science) Young‑Hee Cho (Korean Institute of Material Science) Su‑Hyeon Kim (Korean Institute of Material Science) Kwangjun Euh (Korean Institute of Material Science) Jung‑Moo Lee (Korean Institute of Material Science)

저널정보: 대한금속·재료학회 Metals and Materials International Metals and Materials International Vol.28 No.7

발행연도: 2022.7

수록면: 1,549 - 1,560 (12page)

DOI: 10.1007/s12540-021-01061-z

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The effect of ultrasonic melt treatment (UST) on the solidification microstructure of an Al?5Ti?1B alloy containing highvolumefractions of Al3Tiand TiB2particles is investigated for various UST times with different melt holding times. Theas-cast Al?5Ti?1B alloy is composed of TiB2and polygonal Al3Tiparticles (present prior to UST), plate-like Al3Tiparticles,and Al grains (formed during UST and/or solidification). The UST causes a size reduction and homogeneous distributionof the TiB2-agglomerated region containing many submicron-sized TiB2particles pushed to the grain boundaries. The USTslightly decreases the size and improves the distribution of polygonal Al3Tiparticles enriched in the TiB2-agglomeratedregion. Unlike the TiB2and polygonal Al3Tiparticles, which exhibit a minor refining effect, the plate-like Al3Tiparticlesshow a significant refinement with UST application. The UST has a significant effect on the size distribution of Al grains byinducing the formation of medium-sized grains at the expense of small and large grains; however, it only has a slight effecton grain refinement. The degree of microstructure modification increases with increasing UST time but decreases with meltholding time after UST. The mechanisms for the refinement and dispersion of the TiB2and Al3Tiparticles and Al grains arediscussed considering fragmentation, nucleation, and growth behaviors induced by the UST and subsequent solidification.

#Aluminum alloys · Ultrasonic melt treatment · Microstructure · Inoculant particles · Growth restriction

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