Zhu Yulong, Sun Yaowu, Huang An, Wang Fangxi, Chen Peng
Key Laboratory of Automobile Materials of Ministry of Education & School of Materials Science and Engineering, Jilin University, Changchun 130025, China.
Department of Chemical Engineering, Virginia Tech, Blacksburg, VA 24060, USA.
Nanomaterials (Basel). 2025 Jan 31;15(3):232. doi: 10.3390/nano15030232.
After the thermal-mechanical processing of Mg alloys, extensive 30°⟨0001⟩ grain boundaries (GBs) are present in the recrystallized structure, which strongly affects the mechanical properties via interactions with lattice dislocations. In this work, we systematically investigate how the 30°⟨0001⟩ GBs influence the slip transmission during plastic deformation. We reveal that basal dislocations can be transmuted into its neighboring grain and continue gliding on the basal plane. The prismatic dislocation can transmit the GB remaining on the same Burgers vector. However, a mobile pyramidal c+a dislocation can be absorbed at GBs, initiating the formation of new grain. These findings provide a comprehensive understanding on GB-dislocation interaction in hexagonal close-packed (HCP) metals.
在镁合金的热机械加工之后，再结晶组织中存在大量的30°〈0001〉晶界，这些晶界通过与晶格位错的相互作用强烈影响力学性能。在这项工作中，我们系统地研究了30°〈0001〉晶界如何在塑性变形过程中影响滑移传递。我们发现基面位错可以转变到相邻晶粒并在基面上继续滑移。棱柱位错可以在相同的伯格斯矢量上穿过晶界。然而，一个可移动的棱锥c+a位错可以在晶界处被吸收，引发新晶粒的形成。这些发现为理解六方密排（HCP）金属中的晶界-位错相互作用提供了全面的认识。
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