Effects of I- and W-Phases Under Identical Conditions on Microstructure and Mechanical Properties of As-Cast Mg?Zn?Y Alloys at Room and Elevated Temperatures

Young‑Gil Jung; Wonseok Yang; Jae Ik Hyun; Shae K. Kim; Hyunkyu Lim; Do Hyang Kim

doi:10.1007/s12540-020-00848-w

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자료유형: 학술저널

저자정보: Young‑Gil Jung (Korea Institute of Industrial Technology) Wonseok Yang (Korea Institute of Industrial Technology) Jae Ik Hyun (Yonsei University) Shae K. Kim (Korea Institute of Industrial Technology) Hyunkyu Lim (Korea Institute of Industrial Technology) Do Hyang Kim (Yonsei University)

저널정보: 대한금속·재료학회 Metals and Materials International Metals and Materials International Vol.27 No.12

발행연도: 2021.12

수록면: 5,154 - 5,164 (11page)

DOI: 10.1007/s12540-020-00848-w

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Three alloys (Mg?6Zn?1.2Y, Alloy I; Mg?3.65Zn?1.65Y, Alloy II; and Mg?4.3Zn?1.4Y, Alloy III) with same volume fractionand grain size were designed to evaluate the effects of the I-phase (Mg3Zn6Y) and W-phase (Mg3Zn3Y2), which are themajor phases in Mg?Zn?Y alloys, on the mechanical properties. The tensile strength of Alloy I with the I-phase at roomtemperature was the highest among the tested alloys because the coherent interface between the I-phase and the α-Mg phasewas more resistant to cracking than the incoherent interface between the W-phase and the α-Mg phase. A cross-sectionalmicrostructure analysis of a sample that was tensile-tested at 423 K revealed that the morphology of the I-phase remainedrelatively stable. In contrast, the W-phase was broken and fragmented during the tensile test at 423 K because it had higherbrittleness under the test conditions. Therefore, the tensile and creep properties of Alloy I at 423 K were better than thoseof Alloys II and III containing the W-phase. According to the results, the I-phase in the Mg-Zn-Y alloy was more beneficialto the mechanical properties at room temperature and 423 K than the W-phase.

#Mg-Zn-Y alloys #Interface relationship #Mechanical properties #Fracture surface

참고문헌 (23)

참고문헌 신청

L. Zhang / 2016 / Microstructural characteristics and mechanical properties of Mg–Zn–Y alloy containing icosahedral quasicrystals phase treated by pulsed magnetic feld / J. Alloys Compd 688:868~874

J. Medina / 2016 / Microstructural changes in an extruded Mg–Zn–Y alloy reinforced by quasi-crystalline I-phase by small additions of calcium, manganese and cerium-rich mischmetal / Mater. Charact 118:186~198

Z. Zhang / 2015 / Effects of phase composition and content on the microstructures and mechanical properties of high strength Mg–Y–Zn–Zr alloys / Mater. Des 88:915~923

T. Y. Kwak / 2015 / Effect of Ca and CaO on the microstructure and hot compressive deformation behavior of Mg–9.5Zn–2.0Y alloy / Mater. Sci. Eng. A 658:146~156

K. Yang / 2016 / Effect of micro alloying with boron on the microstructure and mechanical properties of Mg-Zn–Y–Mn alloy / Mater. Sci. Eng. A 669:340~343

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