Microstructure and Mechanical Properties of TaNbVTiAlx Refractory High-Entropy Alloys

A series of TaNbVTiAlx (x = 0, 0.2, 0.4, 0.6, 0.8, and 1.0) refractory high-entropy alloys (RHEAs) with high specific strength and reasonable plasticity were prepared using powder metallurgy (P/M) technology. This paper studied their microstructure and compression properties. The results show that all the TaNbVTiAlx RHEAs exhibited a single BCC solid solution microstructure with no elemental segregation. The P/M TaNbVTiAlx RHEAs showed excellent room-temperature specific strength (207.11 MPa*cm3/g) and high-temperature specific strength (88.37 MPa*cm3/g at 900 °C and 16.03 MPa*cm3/g at 1200 °C), with reasonable plasticity, suggesting that these RHEAs have potential to be applied at temperatures >1200 °C. The reasons for the excellent mechanical properties of P/M TaNbVTiAl0.2 RHEA were the uniform microstructure and solid solution strengthening effect.

[1]  P. Liaw,et al.  Solid‐Solution Phase Formation Rules for Multi‐component Alloys , 2008 .

[2]  J. Yeh,et al.  Effect of Al addition on mechanical properties and microstructure of refractory AlxHfNbTaTiZr alloys , 2015 .

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

[4]  Gang Lu,et al.  The Peierls—Nabarro Model of Dislocations: A Venerable Theory and its Current Development , 2005 .

[5]  Yiping Lu,et al.  Effects of electro-negativity on the stability of topologically close-packed phase in high entropy alloys , 2014 .

[6]  M. Harmer,et al.  Materials informatics for the screening of multi-principal elements and high-entropy alloys , 2019, Nature Communications.

[7]  Bin Liu,et al.  Microstructure and Mechanical Properties of Particulate Reinforced NbMoCrTiAl High Entropy Based Composite , 2018, Entropy.

[8]  Walter Steurer,et al.  Structural-disorder and its effect on the mechanical properties in single-phase TaNbHfZr high-entropy alloys , 2015, 1510.09047.

[9]  Youtong Fang,et al.  Deformation twinning behaviors of the low stacking fault energy high-entropy alloy: An in-situ TEM study , 2017 .

[10]  Yang Shao,et al.  Microstructures and mechanical properties of TixNbMoTaW refractory high-entropy alloys , 2018 .

[11]  X. Yang,et al.  Alloy Design and Properties Optimization of High-Entropy Alloys , 2012 .

[12]  K. Yao,et al.  Microstructure, phase stability and mechanical properties of Nb–Ni–Ti–Co–Zr and Nb–Ni–Ti–Co–Zr–Hf high entropy alloys , 2015 .

[13]  Hong Wu,et al.  Effect of heat treatment on mechanical property and microstructure of a powder metallurgy nickel-based superalloy , 2019, Materials Science and Engineering: A.

[14]  S. Hong,et al.  Microstructure, mechanical property and Hall-Petch relationship of a light-weight refractory Al0.1CrNbVMo high entropy alloy fabricated by powder metallurgical process , 2018, Journal of Alloys and Compounds.

[15]  C. Woodward,et al.  Microstructure and Room Temperature Properties of a High-Entropy TaNbHfZrTi Alloy (Postprint) , 2011 .

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

[17]  Y. Liu,et al.  Precipitation behavior during hot deformation of powder metallurgy Ti-Nb-Ta-Zr-Al high entropy alloys , 2018, Intermetallics.

[18]  T. Shun,et al.  Nanostructured High‐Entropy Alloys with Multiple Principal Elements: Novel Alloy Design Concepts and Outcomes , 2004 .

[19]  C. Yiwen,et al.  Design of novel low-density refractory high entropy alloys for high-temperature applications , 2019, Materials Science and Engineering: A.

[20]  Q. Fang,et al.  A particle reinforced NbTaTiV refractory high entropy alloy based composite with attractive mechanical properties , 2020 .

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

[22]  Hongwei Yao,et al.  MoNbTaV Medium-Entropy Alloy , 2016, Entropy.

[23]  C. Persson,et al.  Alloy design for intrinsically ductile refractory high-entropy alloys , 2016 .

[24]  C. Liu,et al.  Phase stability in high entropy alloys: Formation of solid-solution phase or amorphous phase , 2011 .

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

[26]  Liang Wang,et al.  Composition design of high entropy alloys using the valence electron concentration to balance strength and ductility , 2018 .

[27]  Xiao Yang,et al.  Microstructures and Crackling Noise of AlxNbTiMoV High Entropy Alloys , 2014, Entropy.

[28]  P. Liaw,et al.  Microstructure and Compressive Properties of NbTiVTaAlx High Entropy Alloys , 2012 .

[29]  Akira Takeuchi,et al.  Classification of Bulk Metallic Glasses by Atomic Size Difference, Heat of Mixing and Period of Constituent Elements and Its Application to Characterization of the Main Alloying Element , 2005 .

[30]  Y. Liu,et al.  Microstructures and mechanical properties of ductile NbTaTiV refractory high entropy alloy prepared by powder metallurgy , 2019, Journal of Alloys and Compounds.

[31]  Zi-kui Liu,et al.  Phase stability and mechanical properties of AlHfNbTiZr high-entropy alloys , 2018 .

[32]  Wei Chen,et al.  Lattice distortion in a strong and ductile refractory high-entropy alloy , 2018, Acta Materialia.

[33]  J. Zou,et al.  A novel quaternary equiatomic Ti-Zr-Nb-Ta medium entropy alloy (MEA) , 2018, Intermetallics.

[34]  N. Stepanov,et al.  Effect of Al content on structure and mechanical properties of the AlxCrNbTiVZr (x = 0; 0.25; 0.5; 1) high-entropy alloys , 2016 .

[35]  Dapeng Xu,et al.  A review on fundamental of high entropy alloys with promising high–temperature properties , 2018, Journal of Alloys and Compounds.

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