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논문 기본 정보

자료유형
학술저널
저자정보
Jae Nam Kim (Pohang University of Science and Technology (POSTECH)) Chong Soo Lee (Pohang University of Science and Technology (POSTECH)) Young Sool Jin (Pohang University of Science and Technology (POSTECH))
저널정보
대한금속·재료학회 Metals and Materials International Metals and Materials International Vol.24 No.5
발행연도
2018.1
수록면
1,090 - 1,098 (9page)

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초록· 키워드

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Correlations of stoichiometry and phase structure of Mg x Zn y in hot-dipped Zn–Mg–Al coating layer which were modifi edby additive element have been established on the bases of diff raction and phase transformation principles. X-ray diff raction(XRD) results showed that Mg x Zn y in the Zn–Mg–Al coating layers consist of Mg 2 Zn 11 and MgZn 2 . The additive elementshad a signifi cant effect on the phase fraction of Mg 2 Zn 11 while the Mg/Al ratio had a negligible effect. Transmissionelectron microscope (TEM) assisted selected area electron diff raction (SAED) results of small areas Mg x Zn y were indexeddominantly as MgZn 2 which have different Mg/Zn stoichiometry between 0.10 and 0.18. It is assumed that the Mg x Zn y havedeviated stoichiometry of the phase structure with additive element. The deviated Mg 2 Zn 11 phase structure was interpretedas base-centered orthorhombic by applying two theoretical validity: a structure factor rule explained why the base-centeredorthorhombic Mg 2 Zn 11 has less reciprocal lattice refl ections in the SAED compared to hexagonal MgZn 2 , and a phasetransformation model elucidated its reasonable lattice point sharing of the corresponding unit cell during hexagonal MgZn 2( a , b = 0.5252 nm, c = 0.8577 nm) transform to intermediate tetragonal and fi nal base-centered orthorhombic Mg 2 Zn 11( a = 0.8575 nm, b = 0.8874 nm, c = 0.8771 nm) in the equilibrium state.

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