The influence mechanism of Ni element on the structure and properties of FeCrCoW alloy

The mechanical and electrical properties of strain gauge resistance alloys are intricately related to the element content of their alloys, and play a crucial role in the performance of sensors. This study delves into the effects of different Ni contents on the mechanical properties, microstructure, and electrical properties of FeCrCoWNi strain gauge alloy metals. Through comprehensive analysis of tensile testing, XRD, EDS, SEM, and TEM, the effects of different Ni contents on the mechanical and electrical properties of the alloy were discussed in detail and systematically, and the fracture mechanism was investigated. The research results indicate that with the increase of Ni content, the yield strength of FeCrCoWNi alloy shows a trend of first decreasing and then increasing, while the hardness shows a trend of first increasing and then decreasing, and the electrical resistivity gradually decreases. Transmission electron microscopy and X-ray diffraction analysis have shown that the addition of Ni results in grain refinement caused by the fcc phase, as well as excellent particle strengthening effects. The increase in grain size after Ni addition leads to a decrease in the number of grain boundaries, which is considered the main driving factor affecting the mechanical and electrical properties of the alloy.