Nanoscale Tribological Properties of Nanostructure Fe3Al and (Fe,Ti)3Al Compounds Fabricated by Spark Plasma Sintering Method

Nanostructured powder particles of Fe3Al and (Fe,Ti)(3)Al phases were produced using mechanical alloying. These intermetallic phases with a nearly complete density were consolidated by spark plasma sintering. The mechanical properties of the bulk samples, i.e., elasticity modulus, hardness, and plasticity index, and also their tribological behavior were investigated using nanoindentation and nano-scratch tests. It was found that both Fe3Al and (Fe,Ti)(3)Al phases can be synthesized after 30 h of high-energy ball milling. In addition, no phase evolution was observed after spark plasma sintering. An analysis of the atomic force microscope images obtained from the nanoindentation tests showed a higher elasticity modulus, higher hardness, and lower plasticity index due to the addition of Ti to the Fe3Al system. (Fe,Ti)(3)Al displayed better tribological properties as compared with Fe3Al. A smaller volume of the scratched line was clearly seen in the atomic force microscope images of the nanostructured (Fe,Ti)(3)Al compound.

Automated summary

Nanostructured powder particles of Fe3Al and (Fe,Ti)3Al phases were synthesized using mechanical alloying and consolidated by spark plasma sintering. The mechanical properties, including elasticity modulus, hardness, and plasticity index, as well as the tribological behavior of the samples, were evaluated using nanoindentation and nano-scratch tests. The addition of Ti improved the mechanical properties of the Fe3Al system, and the (Fe,Ti)3Al compound exhibited better tribological properties compared to Fe3Al.