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논문 기본 정보

자료유형
학술저널
저자정보
L. P. Yan (Henan University of Science and Technology) Q. A. Li (Henan University of Science and Technology) X. Y. Chen (Henan University of Science and Technology)
저널정보
대한금속·재료학회 Metals and Materials International Metals and Materials International Vol.27 No.9
발행연도
2021.9
수록면
3,522 - 3,528 (7page)
DOI
10.1007/s12540-020-00661-5

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초록· 키워드

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The microstructure evolution and dynamic precipitation behavior of Mg?10Gd?4Y?1Sm?0.5Zr alloy during backward hotextrusion are studied. The results show that the equiaxed grains become polygonal grains and fine DRX grains are generatedwhich form a “necklace structure” along the initial deformed grain boundaries. With further increase of deformation,DRX grains volume fraction significantly increases and finally almost fully DRX extruded microstructure is obtained inthe completely hot-extruded sample. The extrusion deformation results in increase of dislocation density and formationof dislocation cells. The subgrain boundaries continue to absorb dislocations and finally change from the low angle grainboundaries to the high angle grain boundaries. Hot extrusion deformation results in formation of dynamic precipitated phase,β phase particle, i.e., Mg5(Gd,Y) phase, with diameter of 45?145 nm, which is incoherent relationship with the matrix. Inprocess of increasing deformation, the shape of β phase changes from spindle shape to disc shape and the distribution of βphase transforms from strip distribution along grain boundary to discrete distribution.

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