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논문 기본 정보

자료유형
학술저널
저자정보
Alireza Karimnejad (Sahand University of Technology) Mehrdad Ashjari (University of Tabriz) Akbar Heidarzadeh (Azarbaijan Shahid Madani University) Tohid Saeid (Sahand University of Technology)
저널정보
대한금속·재료학회 Metals and Materials International Metals and Materials International Vol.27 No.9
발행연도
2021.9
수록면
3,508 - 3,521 (14page)
DOI
10.1007/s12540-020-00643-7

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초록· 키워드

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In this study, friction stir butt welding was applied to weld an aluminum?zinc alloy produced by semi-solid method (rheocasting). For this aim, the effect of tool rotational and traverse speeds on the microstructure was investigated. The microstructuresof the processed materials were studied using optical microscopy, scanning electron microscopy equipped withenergy dispersive spectroscopy, and X-ray diffraction. The Vickers hardness test was used to evaluate the hardness of thejoints. The results showed that the friction stir welding using optimum parameters improved the structure of the rheocastalloy. The porosities were eliminated due to severe plastic deformation induced to the material, which caused filling thevoids. Friction stir welding lead to replacement of the semi-solid structure by finer equiaxed grains, which are formed bycontinuous dynamic recrystallization mechanism. High rotational speeds and low traverse speeds (high heat inputs) causedformation of larger grains, due to grain growth at higher temperatures. On the other hand, at high heat inputs the eutecticphases were more scattered throughout the microstructure, and super saturated solid solution was formed. Because of thisbehavior, the relationship between the hardness and grain size of the joints did not follow the classical Hall?Petch equation.

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