About this Abstract |
Meeting |
MS&T24: Materials Science & Technology
|
Symposium
|
Controlled Synthesis, Processing, and Applications of Structural and Functional Nanomaterials
|
Presentation Title |
Bi-Continuous Graphene-Nickel Composite Fibers with Combined Strength-Ductility |
Author(s) |
Won June Choi, Uschuas Dipta Das, Chunghwan Kim, Wonmo Kang |
On-Site Speaker (Planned) |
Wonmo Kang |
Abstract Scope |
Graphene flakes are often dispersed into a metal matrix to improve its mechanical properties. However, conventional graphene-metal composites suffer from premature failure due to the weak graphene-metal interfaces. To overcome this intrinsic challenge, we present Axially bi-Continuous Graphene-Nickel (ACGN) wires with combined strength and ductility. The ultimate strength and failure strain of 25-μm-diameter ACGN wires are improved by 71.76% and 58.24%, compared to their counterparts–the highest among the current Ni-, Al-, and Cu-based carbon-enhanced metal matrix composites. Our experimental and theoretical analyses indicate that the graphene-nickel interplay is the main underlying mechanism for the superb mechanical behavior. In specific, the continuous graphene passivates the free surface of a fine wire, forming dislocation pileups along the graphene-nickel interface and, therefore, hindering localized necking. |