Synthesis and Characterization of Ti50Ni(50-X)FeX Alloy Produced by Mechanical Alloying and Pressure-Less Sintering

This paper investigated the effect of iron on the Ti50Ni(50-X)FeX alloy fabricated by the powder metallurgy method. The different powder compositions are prepared by planetary ball milling for 8 h, then compacted at 600 MPa and sintered at 1050 & DEG;C for 4 h. Microstructure, chemical composition, and phase evolution of powder and sintered sample were investigated by SEM, EDS, and XRD. Also, the density, hardness, wear, compressive strength, and shape memory effect was measured for each of the sintered samples. SEM and XRD analysis show that sintered sample consists of the (Ni, Fe)-rich and Ti-rich phases with some pores. Porosity has a major effect on the decreases in hardness, density, and compression strength. The lower coefficient of friction, maximum relative density, and higher hardness of 0.37, 66.31%, and 372.7VHN respectively was observed in the 8Fe contained sample but maximum yield strength and compression strength of 67.66 MPa and 76.16 MPa respectively are found without iron sample than other composition samples. The intermetallic secondary phase formation helps improve the hardness and wear properties, but the presence of martensite (NiTi) phase helps higher strength and shape memory effect values of the alloy. Abrasive wear mechanism obtained from SEM analysis of the worn surface of all wear samples.

Automated summary

This study investigated the effect of iron on the Ti50Ni(50-X)FeX alloy fabricated by powder metallurgy. The results showed that the chemical composition, phase evolution, and mechanical properties of the powder and sintered samples were influenced by the iron content.