Ductility by shear band delocalization in the nano-layer of gradient structure. Issue 1 (2nd January 2019)

• Record Type: Journal Article
• Authors: Yuan, Fuping; Yan, Dingshun; Sun, Jiangda; Zhou, Lingling; Zhu, Yuntian; Wu, Xiaolei
• Is Part Of: Materials research letters. Volume 7:Issue 1(2019)
• Page Start: 12
• Page End: 17
• Publication Date: 2019-01-02
• Subjects: Gradient structure -- ductility -- shear band -- strain delocalization -- back-stress hardening; 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: 10.1080/21663831.2018.1546238
• Languages: English
• ISSNs: 2166-3831

Abstract

ABSTRACT: Nanostructured (NS) metals typically fail soon after yielding, starting with the formation of narrow shear bands. Here we report the observation of shear band delocalization in gradient metals. Shear bands were nucleated and delocalized in the NS layers by propagating along the gage length soon after yielding, converting the shear band into a localized strain zone (LSZ). Synergistic work hardening was developed in the LSZ by regaining dislocation hardening capability, and by back-stress hardening from the strain gradients in the axial and depth directions, which helped with enhancing global ductility. GRAPHICAL ABSTRACT: