Enhancing Mechanical Properties Of ZrO2-Cr-Ni Metal-Composite By Adding Yttrium.

Abstract

The mechanical properties of ZrO₂- Cr-Ni metal-composite can be significantly enhanced by incorporating yttrium (Yt) through the powder metallurgy process. Yttrium is known for its ability to stabilize the crystal structure of zirconia (ZrO₂) and improve the overall performance of alloy systems. In this study, we investigate the impact of yttrium addition on the mechanical properties of ZrO₂-Cr-Ni metal- composite prepared via powder metallurgy.
 

The metal-composites were prepared by blending ZrO₂, chromium (Cr), nickel (Ni), and yttrium oxide (Y₂O₃) powders in appropriate proportions. The powder mixture was compacted and sintered under controlled conditions. The results revealed that the addition of yttrium led to the formation of a stable and fine-grained microstructure in the ZrO₂-Cr-Ni alloy. The presence of yttrium as a stabilizer prevented the transformation of zirconia from a tetragonal to a monoclinic phase, resulting in improved mechanical properties. The yttrium addition increased the hardness and tensile strength of the metal-composite, while simultaneously enhancing its fracture toughness and resistance to cracking. The findings suggest that the incorporation of yttrium in the ZrO₂-Cr- Ni metal-composite through the powder metallurgy process enhances its mechanical properties and  expand its  potential applications in industries requiring high-performance materials. This study highlights the significance of yttrium as a valuable alloying element in improving the mechanical properties of ZrO₂-Cr- Ni metal-composites. The understanding gained from this research can serve as a foundation for further studies on the optimization of yttrium content, processing parameters, and the exploration of other alloying elements to achieve tailored mechanical properties in ZrO₂-based composites prepared through powder metallurgy.