晶界强化
材料科学
晶界
粒度
位错
凝聚态物理
变形机理
齐纳钉扎
材料的强化机理
打滑(空气动力学)
晶体孪晶
退火(玻璃)
冶金
复合材料
钉扎力
微观结构
物理
热力学
临界电流
超导电性
作者
Xuefeng Lu,Wei Zhang,Xin Guo,Yang Xu,Junchen Li,Junqiang Ren,Hansong Xue,Fuling Tang
标识
DOI:10.1016/j.ijmecsci.2023.108478
摘要
Grain boundary plasticity dominates the mechanical behavior of materials, and the introduction of intragranular nanotwins can achieve coordination between strength and ductility in metals and alloys. In this effort, nanotwins with different volume contents are introduced in NiCoAl alloys to explore the strengthening mechanism under the Hall-Petch effect from perspectives such as grain boundary energy, grain rotation angle, and grain coarsening. The results indicate that the introduction of nanotwins with critical volume fraction effectively inhibits grain boundary migration and grain combination, and improves the strength of the alloy by reducing grain boundary energy and hindering grain rotation. Meanwhile, it leads to a change in the strengthening mechanism from the combined effects of dislocation movement, grain boundary migration and deformation twinning to the dual strengthening of local movement of dislocations within the grain and Lomer-Cottrell locks. The latter hinders the slip of local dislocations within the grain and improves the mechanical property. In addition, based on the average grain size and atomic mean square displacement after high-temperature annealing, the stability mechanism of nanotwins in the alloy can obtain an insight from the aspect of atomic motion. This article explains the Hall-Petch strengthening mechanism from a more detailed and interesting point and provides insights into the strengthening mechanism of nanotwins under the Hall-Petch effect.
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