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Twin boundary spacing-dependent friction in nanotwinned copper
Zhang JJ; Wei YJ(魏宇杰); Sun T; Hartmaier A; Yan YD; Li XD; Zhang, JJ; Harbin Insitute Technol, Ctr Precis Engn, Harbin 150001, Peoples R China.
Source PublicationPHYSICAL REVIEW B
AbstractThe deformation mechanisms of nanotwinned Cu subjected to nanoscratching are investigated by means of molecular dynamics simulations. Scratching simulations on nanotwinned single-crystalline Cu with the twin planes parallel and perpendicular to the scratching direction are performed. Since the detwinning mechanism is completely suppressed in the former case, no apparent correlation between frictional coefficient and the twin spacing is observed. In samples where the twin planes are perpendicular to the scratching direction, the friction increases as the twin spacing decreases, and then decreases as the twin spacings become even smaller. It results from the competitive plastic deformation between the inclined dislocations and the detwinning mechanism. Subsequent simulations for nanotwinned polycrystalline Cu unveil that in addition to the grain-boundary-associated deformation mechanism, dislocation-mediated detwinning plays a significant role in the plastic deformation of nanotwinned Cu. The twin boundary spacing in turn affects nanotwinned materials to resist scratching via plastic deformation. We demonstrate via the nanoscratching tests that there exists a critical twin boundary spacing for which the friction coefficient is maximized and that this transition results from the competing deformation mechanisms in those nanotwinned materials.
KeywordUltrahigh-strength Molecular-dynamics Maximum Strength Rate Sensitivity Metals Ductility Deformation Mechanisms Nanoscale Scale
Subject Area损伤、破坏机理和微结构演化
Indexed BySCI
WOS IDWOS:000300237800004
Funding OrganizationJ.Z., T.S., and Y.Y. acknowledge the financial support from NSFC (50575058 and 50605012). J.Z. thanks A. Stukowski for his valuable discussion and guidance, and ICAMS for providing computational resources. Y.W. acknowledges support from the 973 Project (2011CB711103) and CAS (KJCX2-EW-L03). A.H. acknowledges financial support through ThyssenKrupp AG, Bayer MaterialScience AG, Salzgitter Mannesmann Forschung GmbH, Robert Bosch GmbH, Benteler Stahl/Rohr GmbH, Bayer Technology Services GmbH, and the state of North Rhine-Westphalia, as well as the European Comission in the framework of the European Regional Development Fund (ERDF).
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Cited Times:21[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Corresponding AuthorZhang, JJ; Harbin Insitute Technol, Ctr Precis Engn, Harbin 150001, Peoples R China.
Recommended Citation
GB/T 7714
Zhang JJ,Wei YJ,Sun T,et al. Twin boundary spacing-dependent friction in nanotwinned copper[J]. PHYSICAL REVIEW B,2012,85(5):054109.
APA Zhang JJ.,魏宇杰.,Sun T.,Hartmaier A.,Yan YD.,...&Harbin Insitute Technol, Ctr Precis Engn, Harbin 150001, Peoples R China..(2012).Twin boundary spacing-dependent friction in nanotwinned copper.PHYSICAL REVIEW B,85(5),054109.
MLA Zhang JJ,et al."Twin boundary spacing-dependent friction in nanotwinned copper".PHYSICAL REVIEW B 85.5(2012):054109.
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