Chinababu Mekala, Naga Krishna Nandivelegu, Sivaprasad Katakam, Prashanth Konda Gokuldoss, Bhaskara Rao Eluri
Advanced Materials Processing Laboratory, Department of Metallurgical and Materials Engineering, National Institute of Technology, Tiruchirappalli 620015, India.
Department of Mechanical Engineering, Vishnu Institute of Technology, Bhimavaram 534202, India.
Materials (Basel). 2021 Dec 29;15(1):230. doi: 10.3390/ma15010230.
Aluminum matrix composites reinforced by CoCrFeMnNi high entropy alloy (HEA) particulates were fabricated using the stir casting process. The as-cast specimens were investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), and transmission electron microscopy (TEM). The results indicated that flake-like silicon particles and HEA particles were distributed uniformly in the aluminum matrix. TEM micrographs revealed the presence of both the matrix and reinforcement phases, and no intermetallic phases were formed at the interface of the matrix and reinforcement phases. The mechanical properties of hardness and tensile strength increased with an increase in the HEA content. The Al 6063-5 wt.% HEA composite had a ultimate tensile strength (UTS) of approximately 197 MPa with a reasonable ductility (around 4.05%). The LM25-5 wt.% HEA composite had a UTS of approximately 195 Mpa. However, the percent elongation decreased to roughly 3.80%. When the reinforcement content increased to 10 wt.% in the LM25 composite, the UTS reached 210 MPpa, and the elongation was confined to roughly 3.40%. The fracture morphology changed from dimple structures to cleavage planes on the fracture surface with HEA weight percentage enhancement. The LM25 alloy reinforced with HEA particles showed enhanced mechanical strength without a significant loss of ductility; this composite may find application in marine and ship building industries.
采用搅拌铸造工艺制备了CoCrFeMnNi高熵合金（HEA）颗粒增强铝基复合材料。通过X射线衍射（XRD）、扫描电子显微镜（SEM）、能谱仪（EDS）和透射电子显微镜（TEM）对铸态试样进行了研究。结果表明，片状硅颗粒和HEA颗粒均匀分布在铝基体中。TEM显微照片显示了基体相和增强相的存在，并且在基体相和增强相的界面处未形成金属间相。硬度和抗拉强度等力学性能随着HEA含量的增加而提高。Al 6063-5 wt.% HEA复合材料的极限抗拉强度（UTS）约为197 MPa，具有合理的延展性（约4.05%）。LM25-5 wt.% HEA复合材料的UTS约为195 Mpa。然而，伸长率百分比降至约3.80%。当LM25复合材料中的增强相含量增加到10 wt.%时，UTS达到210 MPpa，伸长率限制在约3.40%。随着HEA重量百分比的增加，断口表面的断裂形态从韧窝结构转变为解理面。用HEA颗粒增强的LM25合金显示出增强的机械强度，且延展性没有显著损失；这种复合材料可能在海洋和船舶制造行业中得到应用。
