Fabrication of High-Strength Mg?Gd?Nd?Zn?Sn?Zr Alloy via Extrusion and Aging

Yan Zehua; Yu Yandong; Qian Jiahao; Luo Junting; Sang Yanchao

doi:10.1007/s12540-020-00859-7

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자료유형: 학술저널

저자정보: Yan Zehua (Harbin University of Science and Technology) Yu Yandong (Harbin University of Science and Technology) Qian Jiahao (Harbin University of Science and Technology) Luo Junting (Yanshan University) Sang Yanchao (Harbin University of Science and Technology)

저널정보: 대한금속·재료학회 Metals and Materials International Metals and Materials International Vol.27 No.10

발행연도: 2021.10

수록면: 4,182 - 4,194 (13page)

DOI: 10.1007/s12540-020-00859-7

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A high-strength Mg?9Gd?3Nd?1Zn?1Sn?0.5Zr (wt%) alloy bar was successfully fabricated by extrusion and followingaging two-steps processes, during which the alloy′s microstructures were determined to investigate the refinement mechanismduring extrusion and to reveal the morphology precipitation behavior of the as-extruded alloy after aging. Based on thecharacterization of the mechanical properties, the strengthening mechanism of the alloy under different treatment processeshad been discussed. Our results showed that the greater the extent of extrusion, the finer the grains and eutectic phase, andcrushing and dynamic recrystallization are the refinement mechanisms of the alloy in narrow-zone. After peak-aged treatmentat 200 °C, a large number of spherical β′ phase and lamellar precipitated phase had been observed, which replacesthe amorphous β" phase of the alloy was under-aged. The ultimate tensile strength, yield strength, and elongation were462.12 MPa, 391.97 MPa, and 4.2% respectively, and the increase number of the β′ phase and long-period stacking ordered(LPSO) phase were the reason why the strength of the alloy reached the highest value. At the over-aging stage (96 h), thesize of the lamellar precipitates and the LPSO was larger than that of the peak-aged, and the spherical β′ phase appeared inpeak-aging stage decreased significantly, which reduced its performance.

#Mg?9Gd?3Nd?1Zn?1Sn?0.5Zr alloy #Extrusion #Refinement #Precipitation #Microstructure #Mechanical properties

참고문헌 (47)

참고문헌 신청

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V. G. Tkachenko / 2011 / Design and microstructural analysis of magnesium alloys for dynamical applications / J. Mater. Sci 46(14):4880~4895

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A. J. Carpenter / 2014 / A mechanism-dependent material model for the effects of grain growth and anisotropy on plastic deformation of magnesium alloy AZ31 sheet at 450 °C / Acta Mater 68:254~266

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