Design and development of modified cold compaction die for fabrication of nickel-titanium composite

Abstract Generally, Nickel-Titanium composites are prepared by powder metallurgy (PM) process in which the design and shape of compaction die considerably influence the characteristics of the final products. The formation of circumferential cracks and higher porosity are the major issues of this process. Therefore, the work comprises the design and fabrication of a modified cold compaction die by incorporate one additional part named as liner that prepared the Nickel-Titanium composite without circumferential cracks. The work includes design calculations, modeling and die fabrication. The die design was evaluated by SOLIDWORKS 2017-18 in a simulated conditions, and further examined experimentally by fabricating the Nickel-Titanium composite at 140 kN compaction load using UTM. The results showed that a crack-free dense Nickel-Titanium composite was successfully fabricated by this modified die. The densification, compressive strength and Rockwell hardness of NiTi composite fabricated using this die were achieved upto 86.7 %, 108.29 MPa and 64.2 HRC.