Microstructure and Mechanical Properties of Ti50Ni(50-X)FeX Alloys Fabricated by Powder Metallurgy Process

This paper investigates the microstructure and mechanical properties of Ti50Ni(50-X)FeX alloys fabricated by powder metallurgy technique. Here, sintering temperatures varied from 1100 degrees C to 1200 degrees C for the compacted milled powder mixture. Microstructure, chemical composition, phase formation, porosity, density, hardness, wear, shape memory effect, and compressive strength of the sintered sample were carried out using SEM, EDS, XRD, and mechanical tests, respectively. The SEM and XRD analysis results show that the microstructure of alloys consists of (Ni, Fe)-rich, Ti-rich phases with less retained pore. The densification and hardness increase with increasing the sintering temperature. The 4 at. pct Fe sample sintered at 1200 degrees C shows higher densification, a lower friction coefficient, and a higher hardness value. The 4 at. pct Fe sample sintered at 1150 degrees C shows higher compressive, and yield strengths of 132.57 and 116.86 MPa, respectively, and the 6 at. pct Fe sample sintered at 1200 degrees C shows a higher shape memory effect of 3.37 pct, which are higher in comparison to other compositions and other sintering temperature samples. Abrasive wear of the sample has been carried out, and it found that there is a decrease in friction coefficient value with an increase in sintering temperature from 1150 degrees C to 1200 degrees C of the sample. [GRAPHICS] .