Structure and mechanical properties of a light-weight AlNbTiV high entropy alloy

The crystal structure, microstructure, density, microhardness and mechanical properties of new AlNbTiV high entropy alloy were examined. The alloy had coarse-grained single bcc phase structure with density of 5.59 g cm−3 and hardness of 4315–4394 MPa. The compressive yield strength of the alloy gradually decreased from 1020 MPa at room temperature to 685 MPa at 800 °C, and then dropped to 158 MPa at 1000 °C. Specific yield strength of the alloy was found to be comparable with strength of multiphase refractory high entropy alloys. Effect of chemical composition on mechanical properties and potential ways to optimize composition are discussed.

[1]  I. Guillot,et al.  New structure in refractory high-entropy alloys , 2014 .

[2]  Tao Wang,et al.  A refractory Hf25Nb25Ti25Zr25 high-entropy alloy with excellent structural stability and tensile properties , 2014 .

[3]  Yong Zhang,et al.  Prediction of high-entropy stabilized solid-solution in multi-component alloys , 2012 .

[4]  Thierry Chauveau,et al.  Microstructure of a near-equimolar refractory high-entropy alloy , 2014 .

[5]  Oleg N. Senkov,et al.  Low-Density, Refractory Multi-Principal Element Alloys of the Cr-Nb-Ti-V-Zr System: Microstructure and Phase Analysis (Postprint) , 2013 .

[6]  Oleg N. Senkov,et al.  Effect of aluminum on the microstructure and properties of two refractory high-entropy alloys , 2014 .

[7]  D. Miracle,et al.  Mechanical properties of Nb25Mo25Ta25W25 and V20Nb20Mo20Ta20W20 refractory high entropy alloys , 2011 .

[8]  C. Woodward,et al.  Microstructure and elevated temperature properties of a refractory TaNbHfZrTi alloy , 2012, Journal of Materials Science.

[9]  Daniel B. Miracle,et al.  Microstructure and Properties of Aluminum-Containing Refractory High-Entropy Alloys , 2014, JOM.

[10]  C. Liu,et al.  Effect of valence electron concentration on stability of fcc or bcc phase in high entropy alloys , 2011 .

[11]  A. Takeuchi,et al.  Mixing enthalpy of liquid phase calculated by miedema’s scheme and approximated with sub-regular solution model for assessing forming ability of amorphous and glassy alloys , 2010 .

[12]  K. Dahmen,et al.  Microstructures and properties of high-entropy alloys , 2014 .

[13]  P. Liaw,et al.  Refractory high-entropy alloys , 2010 .

[14]  C. Woodward,et al.  Mechanical properties of low-density, refractory multi-principal element alloys of the Cr–Nb–Ti–V–Zr system , 2013 .

[15]  C. Woodward,et al.  Microstructure and properties of a refractory NbCrMo0.5Ta0.5TiZr alloy , 2011 .

[16]  Livio Battezzati,et al.  Search for high entropy alloys in the X-NbTaTiZr systems (X = Al, Cr, V, Sn) , 2015 .