方向错误
材料科学
融合
微观结构
位错
晶界
退火(玻璃)
再结晶(地质)
复合材料
高斯分布
语言学
量子力学
生物
物理
哲学
古生物学
作者
Dennis Edgard Jodi,Tomonori Kitashima,Alok Kumar Singh,Makoto Watanabe
标识
DOI:10.1016/j.matchar.2023.112897
摘要
The effects of annealing on the microstructure of pure Ni fabricated by laser powder bed fusion (LPBF) were investigated using two different beam profiles: Gaussian and flat-top. The dislocations in the as-fabricated samples were predominantly arranged as statistically stored dislocations, and the low driving force resulting from the insufficient accumulation of geometrically necessary dislocations (GNDs) in the as-fabricated specimens caused minimal static recrystallization in the as-annealed specimens, despite the high dislocation density in the as-fabricated samples, particularly the Gaussian-LPBF-derived specimens. However, static recovery occurred in both the Gaussian-LPBF and flat-top-LPBF-derived specimens, with the higher number of GNDs in the former specimens causing a more prominent misorientation of dislocation boundaries than in the latter. Furthermore, migration of high-angle grain boundaries (HAGBs; misorientation >15°) was not observed because of the insufficient strain gradient and the distribution of HAGBs in low-energy regions.
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