Back stress in strain hardening of carbon nanotube/aluminum composites

Materials Research Letters

Run Xu¹  Zhiqiang Li¹  Genlian Fan¹  Ding-Bang Xiong¹  Cuiping Guo¹  Zhanqiu Tan¹  Qiang Guo¹  Di Zhang¹  Gang Ji²  Benoît Beausir³  Cai Chen³ 

[1] Shanghai Jiao Tong University;Unité Matériaux et Transformations (UMET) CNRS UMR 8207;Université de Lorraine/CNRS;

关键词: carbon nanotubes;    metal matrix composite;    strain hardening;    back stress;    geometrically-necessary dislocations;   

DOI  :  10.1080/21663831.2017.1405371

来源: DOAJ

【 摘 要 】

As demonstrated by the loading–unloading tests and the modeling of the grain size effect and the composite effect, mainly owing to the back stress induced by CNTs, carbon nanotube/aluminum (CNT/Al) composites exhibit higher strain hardening capability than the unreinforced ultrafine-grained Al matrix. The back stress induced by CNTs should arise from the interfacial image force and the long-range interaction between statically stored dislocations and geometrically necessary dislocations around the CNT/Al interface. Therefore, this CNT-induced interfacial back stress strengthening mechanism is supposed to provide a novel route to enhancing the strain hardening capability and ductility in CNT/Al composites. IMPACT STATEMENT The present work investigates the roles and origins of back stress in the strain hardening of the carbon nanotubes/aluminum composites for the first time.

【 授权许可】

Unknown