Effect of soaking time on the preparation of porous NiTi alloy during fields-activated micro-sintering and forming technology

¹ School of Manufacturing Science and Engineering, Sichuan University, Chengdu, Sichuan 610065, PR China
² Department of Design, Manufacture and Engineering Management, University of Strathclyde, James Weir Building, 75 Montrose Street, Glasgow G1 1XQ, UK

^a Corresponding author: e-mail: yangyi@scu.edu.cn

Abstract

In this study, porous NiTi alloys have been successfully produced by fields-activated micro-sintering and forming technology under the pressure of 75 MPa at 1100^∘C. The effects of soaking time on the porous NiTi alloys were investigated by analysing porosities, microstructures, and phase compositions of the produced alloys. The porosities of 41.2%, 38.8% and 47.2% are achieved at the soaking time of 2 min, 6 min and 10 min respectively. SEM examinations show that the pore size is varied with the soaking time and X-ray diffraction studies reveal that the main phases are NiTi, Ni₃Ti and NiTi₂.