织构对Mg-Gd-Y-Nd-Zr合金疲劳性能的影响
Effect of Texture on Fatigue Properties of Mg-Gd-Y-Nd-Zr Alloy
DOI: 10.12677/MS.2021.115064, PDF,   
作者: 罗 安:中南大学轻合金研究院,湖南 长沙;邓运来*, 官立群:中南大学材料科学与工程学院,湖南 长沙
关键词: Mg-6Gd-2.5Y-1Nd-0.5Zr疲劳织构晶界取向差MG-6GD-2.5Y-1ND-0.5ZR Fatigue Texture Grain Boundary Misorientation
摘要: 本文以不同织构的Mg-6Gd-2.5Y-1Nd-0.5Zr合金为对象,研究了织构对疲劳性能的影响。通过扫描电镜表征了疲劳后试样的断口形貌,在金相显微镜下表征了表面裂纹的扩展路径,并对比不同织构合金的疲劳后试样的形貌差异。结果表明,在形成基面织构后,合金的平均晶界取向差从62.32˚降低到44.01˚,平均施密特因子从0.381降低到0.278,组织均匀性得到提升。晶粒内的位错滑移得到抑制,这使得合金的裂纹萌生寿命和裂纹扩展寿命均得到延长,从而提高了合金的疲劳性能。
Abstract: In this paper, the Mg-6Gd-2.5Y-1Nd-0.5Zr alloy with different textures was used as the object to study the effect of texture on fatigue performance. The fracture morphology of the fatigue specimen was characterized by scanning electron microscope, the propagation path of the surface crack was characterized under the metallographic microscope, and the morphology difference of the fatigue specimen with different texture was compared. The results show that after the basal texture is formed in the alloy, the average grain boundary misorientation is reduced from 62.32˚ to 44.01˚, the average Schmidt factor is reduced from 0.381 to 0.278, and the uniformity of the structure is improved. The dislocation slip in the grains was suppressed, which makes the crack initiation life and crack propagation life of the alloy prolonged, thereby improving the fatigue performance of the alloy.
文章引用:罗安, 邓运来, 官立群. 织构对Mg-Gd-Y-Nd-Zr合金疲劳性能的影响[J]. 材料科学, 2021, 11(5): 554-561. https://doi.org/10.12677/MS.2021.115064

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