Back stress in strain hardening of carbon nanotube/aluminum composites. Issue 2 (1st February 2018)

• Record Type: Journal Article
• Authors: Xu, Run; Fan, Genlian; Tan, Zhanqiu; Ji, Gang; Chen, Cai; Beausir, Benoît; Xiong, Ding-Bang; Guo, Qiang; Guo, Cuiping; Li, Zhiqiang; Zhang, Di
• Is Part Of: Materials research letters. Volume 6:Issue 2(2018)
• Page Start: 113
• Page End: 120
• Publication Date: 2018-02-01
• Subjects: Carbon nanotubes -- metal matrix composite -- strain hardening -- back stress -- geometrically-necessary dislocations; Materials science -- Research -- Periodicals; Biomedical materials -- Research -- Periodicals; Composite materials -- Research -- Periodicals; Biomedical materials -- Research; Composite materials -- Research; Materials science -- Research; Periodicals; 620.1105
• DOI: 10.1080/21663831.2017.1405371
• Languages: English
• ISSNs: 2166-3831

Abstract

ABSTRACT: 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. GRAPHICAL ABSTRACT: