On cooling rates dependence of microstructure and mechanical properties of refractory high-entropy alloys HfTaTiZr and HfNbTiZr

2022 ◽  
Vol 211 ◽  
pp. 114506
Hailong Huang ◽  
Yan Sun ◽  
Peipei Cao ◽  
Yuan Wu ◽  
Xiongjun Liu ◽  
2021 ◽  
Vol 282 ◽  
pp. 128736 ◽  
Qingkai Shen ◽  
Xiangdong Kong ◽  
Xizhang Chen ◽  
Xukai Yao ◽  
Vladislav B. Deev ◽  

2017 ◽  
Vol 898 ◽  
pp. 638-642 ◽  
Dong Xu Qiao ◽  
Hui Jiang ◽  
Xiao Xue Chang ◽  
Yi Ping Lu ◽  
Ting Ju Li

A series of refractory high-entropy alloys VTaTiMoAlx with x=0,0.2,0.6,1.0 were designed and produced by vacuum arc melting. The effect of added Al elements on the microstructure and mechanical properties of refractory high-entropy alloys were investigated. The X-ray diffraction results showed that all the high-entropy alloys consist of simple BCC solid solution. SEM indicated that the microstructure of VTaTiMoAlx changes from equiaxial dendritic-like structure to typical dendrite structure with the addition of Al element. The composition of different regions in the alloys are obtained by energy dispersive spectroscopy and shows that Ta, Mo elements are enriched in the dendrite areas, and Al, Ti, V are enriched in inter-dendrite areas. The yield strength and compress strain reach maximum (σ0.2=1221MPa, ε=9.91%) at x=0, and decrease with the addition of Al element at room temperature. Vickers hardness of the alloys improves as the Al addition.

2021 ◽  
Vol 260 ◽  
pp. 124175
Wenna Jiao ◽  
Hui Jiang ◽  
Dongxu Qiao ◽  
Junyang He ◽  
Hongliang Zhao ◽  

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