The Laser Power Controls the Formation of FeCoNiCrMnTi0.5Al0.5 HEAs: Microstructure and Strengthening Mechanisms
Zhiheng Zhu, Chuanwei Shi, Yuanbin Zhang, Lingchen Kong, Xuan Hao, Shenhao Wang, Fengyuan Guo and Yushuang Huo
By adding Al and Ti elements to FeCoNiCrMn-based high-entropy alloys (HEAs) and using laser cladding technology, a surface coating with good formation and high wear resistance was successfully prepared on the surface of 45# steel. Based on advanced analytical methods, the coating formation quality, microstructure, and wear mechanisms under different laser powers were systematically analyzed. The increase in laser power promotes the improvement of formation quality. The coating matrix phase is a dual-phase structure of BCC (body-centered cubic) and FCC (face-centered cubic). The addition of Al and Ti atoms with large atomic radii causes lattice distortion, which promotes phase transformation. The solid-solution strengthening of the BCC phase, as well as the second-phase strengthening and dispersion strengthening provided by TiC particles, enhance the hardness and wear resistance of the coatings.
Keywords: Laser technology, high entropy alloy, formation quality, wear resistance