Chen Yiwen, Li Yunkai, Cheng Xingwang, Wu Chao, Cheng Bo, Xu Ziqi
School of Materials Science and Engineering, Beijing Institute of Technology, Beijing 100081, China.
National Key Laboratory of Science and Technology on Materials under Shock and Impact, Beijing 100081, China.
Materials (Basel). 2018 Jan 29;11(2):208. doi: 10.3390/ma11020208.
Refractory high-entropy alloys (RHEAs) are promising materials used at high temperature, but their low plasticity restricts their application. Based on the valence electron concentration (VEC) principle, four kinds of RHEAs (ZrTiHfVNb, ZrTiHfVNb, ZrTiHfNbMo, and ZrTiHfNbTa) are designed (VEC < 4.5). The experimental results show that the plasticity of these alloys was greatly improved: the static compressive strain was higher than 50% at room temperature (RT), and some elongations were produced in the tensile process. Moreover, the microstructure and phase composition are discussed in detail. The addition of Nb, Mo, and Ta contributed to the high-temperature strength. Finally, the dynamic mechanical properties of these RHEAs with coordination between strength and plasticity are investigated.
难熔高熵合金（RHEAs）是很有前景的高温应用材料，但其低塑性限制了它们的应用。基于价电子浓度（VEC）原理，设计了四种RHEAs（ZrTiHfVNb、ZrTiHfVNb、ZrTiHfNbMo和ZrTiHfNbTa）（VEC < 4.5）。实验结果表明，这些合金的塑性得到了极大改善：室温（RT）下静态压缩应变高于50%，并且在拉伸过程中产生了一些伸长率。此外，还详细讨论了微观结构和相组成。Nb、Mo和Ta的添加有助于提高高温强度。最后，研究了这些强度和塑性相协调的RHEAs的动态力学性能。
