Fabrication and Characteristic of Multiferroic Composite Actuator TiNi filler/Ni matrix

Abstract

This research is the proposal to design and verification a new magnetically driven multi-ferroic composite actuator material which is characterized by large strain as well as rapid response speed. The composite actuator material is designed to consist of magnetostrictive Ni matrix and superelastic TiNi alloy fiber fillers whose volume fraction was changed. Spark plasma sintering (SPS) method which is characterized by short time and low temperature processing was used for joining of these two different material elements. Cross-sectional observation by laser micrograph, mechanical compression test, and magnetostriction measurement were carried out to verify the perfection of the adhesion state between TiNi filler and nickel matrix as well as the amplification effect of a magnetostriction. As the experimental result, the amplification effect of about a maximum of 1.5-time magnetostriction was verified experimentally in the composite actuator.