Research Article

Deformation behavior of an electrodeposited nano-Ni/amorphous Fe₇₈Si₉B₁₃ laminated composite sheet

School of Materials Science and Engineering, Harbin Institute of Technology, 150001 Harbin, PR China

^* e-mail: jiangss600_2005@163.com

Received: 30 January 2015
Accepted: 5 March 2015

Abstract

A nano-Ni/amorphous Fe₇₈Si₉B₁₃ composite sheet was prepared in the form of three-ply (Ni-Fe₇₈Si₉B₁₃-Ni) laminated structure by an electrodeposition method. The average grain size of Ni layers is about 50 nm. The interface of laminated composite was investigated with SEM equipped with energy dispersive scanning (EDS) and line analysis technique. The laminated composite has a good interfacial bonding between amorphous layer and nano-Ni layers due to the mutual diffusion of atoms in Fe₇₈Si₉B₁₃ and Ni layers during the process of electrodeposition. A maximum elongation of 115.5% was obtained when the volume fraction of nano-Ni layers (V_Ni) was 0.77, which is greatly higher than that of monolithic amorphous Fe₇₈Si₉B₁₃ ribbon (36.3%) tested under the same conditions. Bulging tests were carried out to evaluate plastic forming properties of the Fe₇₈Si₉B₁₃/Ni laminated composite. Under the condition of 450 °C, 4.0 MPa and 30 min, a good bulging part with the relative bulging height (RBH) of 0.4 was obtained.