Strong Crack Blunting by Hierarchical Nanotwins in Ultrafine/Nano-grained Metals

Jianjun Li; Yong Ni; A. K. Soh; X. L. Wu

doi:10.1080/21663831.2015.1048905

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Strong Crack Blunting by Hierarchical Nanotwins in Ultrafine/Nano-grained Metals

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- Strong Crack Blunting by Hierarchical Nanotwins in Ultrafine/Nano-grained Metals
- Materials Research Letters Vol. 3, Issue 4, Pages: 190-196(2015)
- 作者机构：
  
  1. Department of Engineering Mechanics School of Mechanics Civil Engineering and Architecture Northwestern Polytechnical University Xi'an
  2. Department of Modern Mechanics University of Science & Technology of China Hefei
  3. School of Engineering Monash University Malaysia Bandar Sunway
  4. State Key Laboratory of Nonlinear Mechanics Institute of Mechanics Chinese Academy of Sciences
- 作者简介：
- 基金信息：
- DOI：10.1080/21663831.2015.1048905
  CLC：
- Online First：22 May 2015，
  
  Published：2015
- 稿件说明：
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Jianjun Li, Yong Ni, A. K. Soh, et al. Strong Crack Blunting by Hierarchical Nanotwins in Ultrafine/Nano-grained Metals[J]. Materials Research Letters, 2015, 3(4): 190-196.
DOI：

Jianjun Li, Yong Ni, A. K. Soh, et al. Strong Crack Blunting by Hierarchical Nanotwins in Ultrafine/Nano-grained Metals[J]. Materials Research Letters, 2015, 3(4): 190-196. DOI： 10.1080/21663831.2015.1048905.

摘要

Abstract

theoretical model is proposed to illustrate the effect of detwinning of the secondary twin lamellae on the emission of lattice dislocations from a semi-infinite crack tip in a hierarchically nanotwinned metal. The results obtained show that the potential of the crack tip to emit dislocations can be optimized and greatly enhanced by tuning the secondary twin spacing

which leads to strong crack blunting. Moreover

the hierarchical structure is able to produce significant toughening at very thin secondary twin lamellae

as observed in molecular dynamics simulations. As a result

the proposed model suggests a novel toughening mechanism in ultrafine/nano-grained metals.

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