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Pressure sensitivity of dislocation density in copper single crystals at submicron scale
Hu JQ(胡剑桥); Chen Z; Liu ZL; Zhuang Z

It is known that the mechanical responses of metallic samples are insensitive to confining pressure at macroscale. As a result, von Mises elastoplasticity has been commonly used to model metals in engineering practice. With the use of discrete dislocation dynamics in this study, we explore the dislocation behavior of finite-sized copper single crystals of different sizes under uniaxial compression and hydrostatic pressure, respectively. It is found that the dislocation density approaches a stable value with the increase of hydrostatic pressure while it still keeps increasing under uniaxial compression as the size-dependent yield stress is reached. This difference is also dependent on the loading rate. The yield stress under uniaxial compression exhibits the conventional loading rate effect, while the stable value of dislocation density under hydrostatic compression increases with the increase of loading rate. Moreover, a transition from being pressure-insensitive to pressure-sensitive on the evolution of dislocation density is observed under hydrostatic compression as the sample size becomes small. These findings provide useful insights into the elastoplastic responses of metallic samples at microscale.

KeywordDislocation Evolution Hydrostatic Pressure Discrete Dislocation Dynamics
Indexed BySCI ; EI
WOS IDWOS:000419330200004
WOS KeywordNumerical Investigations ; Deformation Mechanisms ; Plastic-deformation ; Micropillars ; Nanopillars ; Nucleation
WOS Research AreaMaterials Science
WOS SubjectMaterials Science, Multidisciplinary
Funding OrganizationNational Natural Science Foundation of China(11132006 ; 11302115 ; 11232003)
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Document Type期刊论文
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GB/T 7714
Hu JQ,Chen Z,Liu ZL,et al. Pressure sensitivity of dislocation density in copper single crystals at submicron scale[J]. MATERIALS RESEARCH EXPRESS,2018,5(1):10.1088/2053-1591/aaa0b8.
APA 胡剑桥,Chen Z,Liu ZL,&Zhuang Z.(2018).Pressure sensitivity of dislocation density in copper single crystals at submicron scale.MATERIALS RESEARCH EXPRESS,5(1),10.1088/2053-1591/aaa0b8.
MLA 胡剑桥,et al."Pressure sensitivity of dislocation density in copper single crystals at submicron scale".MATERIALS RESEARCH EXPRESS 5.1(2018):10.1088/2053-1591/aaa0b8.
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