Grain Morphology and Orientation Effect on the High‑Temperature Tensile Behavior of Directionally Solidified Magnesium Alloy

Qin Tang; Xiaoping Lin; Shengshi Zhao; Yi Niu; Heng Sun; Yun Dong

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자료유형: 학술저널

저자정보: Qin Tang (Northeastern University at Qinhuangdao) Xiaoping Lin (Northeastern University at Qinhuangdao) Shengshi Zhao (Northeastern University at Qinhuangdao) Yi Niu (Southeast University) Heng Sun (Northeastern University at Qinhuangdao) Yun Dong (Northeastern University at Qinhuangdao)

저널정보: 대한금속·재료학회 Metals and Materials International Metals and Materials International Vol.26 No.4

발행연도: 2020.1

수록면: 444 - 455 (12page)

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Columnar-structured Mg97.27Zn2.54Y0.19alloy with the preferred growth direction of ⟨22̄45⟩ and ⟨12̄33⟩, andMg98.01Zn1.84Y0.13Zr0.03alloy with the preferred growth direction of ⟨11̄20⟩ were prepared using the directional solidificationtechnique and then tensile tested at 250–300 °C. The results showed that the Mg97.27Zn2.54Y0.19alloy with columnar dendriticstructure experienced a significant deformation strengthening period when stretched at 250 °C, and a typical dynamicrecrystallization stage at 300 °C, which were mainly accounted for its well-developed secondary dendrites, a large numberof branch-shaped second phases distributed in the longitudinal grain boundary, and less granular second phases existingin the crystal. While in the whole test temperature range (250–300 °C), the stress–strain curves of Mg98.01Zn1.84Y0.13Zr0.03alloys with cellular dendritic crystals showed a steady deformation state because of the second phases with strip distributingin the longitudinal grain boundary, which was induced by a balance between the deformation strengthening and the dynamicrecrystallization. Especially at 300 °C, this steady deformation state existed in the strain of 5.6%–36%. The good uniformplastic deformation was closely related to the small misorientations between columnar grains, the associated movement ofgrains by grain boundary slipping, and the less percentage of dynamically recrystallized grains which could do harm to theorientation continuity of the columnar crystals.

#Directional solidification · Crystal orientation · Dynamic recrystallization · {10̄1 2} Tensile twin

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