Sample size induced brittle-to-ductile transition of single-crystal aluminum nitride

J. J. Guo, K. Madhav Reddy, A. Hirata, T. Fujita, G. A. Gazonas, J. W. McCauley, M. W. Chen

研究成果: Article査読

21 被引用数 (Scopus)

抄録

Ceramics are known to be mechanically hard, chemically inert and electrically insulating for many important applications. However, they usually suffer from brittleness and have moderate strength that strongly depends on their microscopic structure. In this study, we report a size induced brittle-to-ductile transition in single-crystal aluminum nitride (AlN). When the specimen diameters are smaller than ∼3-4 μm, AlN micropillars show metal-like plastic flow under room-temperature uniaxial compression. The unprecedented plastic strain of ∼5-10% together with the ultrahigh strength of ∼6.7 GPa has never been achieved before. Transmission electron microscopy demonstrates that dislocations play a dominant role in the plasticity of the micro-sized AlN.

本文言語English
ページ(範囲)252-259
ページ数8
ジャーナルActa Materialia
88
DOI
出版ステータスPublished - 2015 4 15

ASJC Scopus subject areas

  • 電子材料、光学材料、および磁性材料
  • セラミックおよび複合材料
  • ポリマーおよびプラスチック
  • 金属および合金

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