材料科学
粒度
机制(生物学)
断裂(地质)
脆性
微观结构
钛
脆性断裂
复合材料
晶界强化
冶金
晶界
哲学
认识论
作者
Lin Sun,Zhutian Xu,Linfa Peng,Xinmin Lai
标识
DOI:10.1016/j.scriptamat.2022.114877
摘要
The effect of grain size on the ductile-to-brittle fracture behavior in pure titanium sheets was investigated by building the connection between the defect development and the microstructure evolution. X-ray computed tomography results indicated that the initial defects grow into tiny void clusters with high sphericity in fine-grain (27 μm) specimens. As the grain size increases to 104 μm, the defects changed into large isolated penny-shaped cracks in the contrast. The twin fragmentation and the formation of fine dynamically recrystallized (DRXed) grains resulting from twinning-induced dynamic recrystallization (TDRX) were observed during the failure of the fine-grained specimen. The void nucleation was attributed to the high misorientation difference between DRXed grains. Meanwhile, the TDRX region further expanded accompanied by the void growth . With the increase of grain size, the TDRX phenomenon gradually disappeared. Thus, cleavage cracks propagated after the crystal lattice rotation of elongated grains, showing brittle transgranular fracture in coarse-grain specimens.
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