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Dislocation Behaviors in Nanotwinned Diamond

Dislocation Behaviors in Nanotwinned Diamond

Jianwei Xiao, Huizhen Yang, Xiaozhi Wu, Fatima Younus, Peng Li, Bin Wen, Xiangyi Zhang, Yanbin Wang, Yongjun Tian

Sci Adv. 2018 Sep 21;4(9):eaat8195.

PMID: 30255147

Abstract:

Experimental results (Huang et al.) indicated that nanotwinned diamond (nt-diamond) has unprecedented hardness, whose physical mechanism has remained elusive. In this report, we categorize interaction modes between dislocations and twin planes in nt-diamond and calculate the associated reaction heat, activation energies, and barrier strength using molecular dynamics. On the basis of the Sachs model, twin thickness dependence of nt-diamond hardness is evaluated, which is in good agreement with the experimental data. We show that two factors contribute to the unusually high hardness of nt-diamond: high lattice frictional stress by the nature of carbon bonding in diamond and high athermal stress due to the Hall-Petch effect. Both factors stem from the low activation volumes and high activation energy for dislocation nucleation and propagation in diamond twin planes. This work provides new insights into hardening mechanisms in nt-diamond and will be helpful for developing new superhard materials in the future.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP7782403	Diamond		7782-40-3	Price

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