Chen Yuhua, Liu Wenkuo, Wang Hongwei, Xie Jilin, Zhang Timing, Yin Limeng, Huang Yongde
Jiangxi Key Laboratory of Forming and Joining Technology for Aerospace Components, Nanchang Hangkong University, Nanchang 330063, China.
School of Metallurgy and Materials Engineering, Chongqing University of Science and Technology, Chongqing 401331, China.
Entropy (Basel). 2022 Feb 4;24(2):241. doi: 10.3390/e24020241.
The aim of this study was to investigate the effects of the Ti element addition on the microstructure and properties of CoCrFeNiMn high entropy alloys. The Ti element modified CoCrFeNiMnTi high entropy alloys were prepared by vacuum arc melting processing. The Ti rich body-centered cubic structure phase was observed in CoCrFeNiMnTi and CoCrFeNiMnTi instead of a simple face-centered cubic structure in CoCrFeNiMn. The amount of the Ti-rich phase depicted an increasing trend with increasing Ti content. Simultaneously, the mechanical properties of CoCrFeNiMnTi were obviously improved. When the Ti content is 0, 0.25 and 0.55, the microhardness is 175 HV, 253 HV and 646 HV, which has an obvious increasing trend, while the ductility decreased. The tensile properties show a trend of first strengthening and then decreasing, changing from 461 MPa to 631 MPa and then to 287 MPa. When x was 0.55, the solid-liquid transition temperature of the alloy decreased, and the melting temperature range increased.
本研究的目的是研究添加Ti元素对CoCrFeNiMn高熵合金微观结构和性能的影响。通过真空电弧熔炼工艺制备了Ti元素改性的CoCrFeNiMnTi高熵合金。在CoCrFeNiMnTi和CoCrFeNiMnTi中观察到富Ti的体心立方结构相，而不是CoCrFeNiMn中的简单面心立方结构。富Ti相的数量随着Ti含量的增加呈上升趋势。同时，CoCrFeNiMnTi的力学性能明显提高。当Ti含量为0、0.25和0.55时，显微硬度分别为175 HV、253 HV和646 HV，呈明显上升趋势，而延展性下降。拉伸性能呈现先强化后降低的趋势，从461 MPa变化到631 MPa，然后再降至287 MPa。当x为0.55时，合金的固液转变温度降低，熔化温度范围增大。
