Surface oxide layer strengthening and fracture during flattening of powder particles

Qi Tang, Yuji Ichikawa, Mostafa Hassani

研究成果: ジャーナルへの寄稿学術論文査読

抄録

Surface oxide layer fracture and the subsequent exposure of clean metallic surfaces are critical in various solid-state processes for powder consolidation and additive manufacturing. We resolve this process in-situ by deforming individual spherical powder particles inside a scanning electron microscope. We reveal three fracture modalities, i.e., meridian, radial, and circumferential cracking that sequentially activate with particle flattening. Real time measurements of load and displacement upon particle flattening also reveal a significant strengthening effect by surface oxide. We attribute the strengthening to two mechanisms: the composite strengthening and the strain gradient strengthening.

本文言語英語
論文番号116008
ジャーナルScripta Materialia
244
DOI
出版ステータス出版済み - 2024 4月 15

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