【摘 要】
：
The effect of heat treatment on microstructure and tensile properties of as-cast Al0.5CoCrFeNi high-en-tropy alloy was investigated by X-ray diffraction(XRD),scanning electron microscopy(SEM)equipped with energy-dispersive spectroscopy(EDS),and tensile te
【机 构】
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State Key Laboratory of Solidification Processing,Northwestern Polytechnical University,Xi’an 710072
论文部分内容阅读
The effect of heat treatment on microstructure and tensile properties of as-cast Al0.5CoCrFeNi high-en-tropy alloy was investigated by X-ray diffraction(XRD),scanning electron microscopy(SEM)equipped with energy-dispersive spectroscopy(EDS),and tensile tests.The results show that heat treatment strongly affects the microstructure,particularly the morphology of bcc phases,and improves tensile properties.Microstructure analysis reveals that rod-shaped and elliptoid phases appear in the matrix after heat treatment at 1150℃.Besides,under 850℃heat-treated condition,ultimate tensile strength increases by about 60％ without sacrificing much plasticity,which can be attributed to the content of bcc phases and fine precipitates dispersed in the dendrites.For other heat-treated conditions,tensile ductility increases by at least 30％,especially 60％ for heat treatment at 450℃,and strength also improves.Fracture analysis indicates that the fracture mode of heat treatment at 850℃ is a mixture of quasi-cleavage and ductile fracture,while the other heat-treated conditions show the mode of ductile fracture.
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