Anomalous solidification microstructures in Co-free AlxCrCuFeNi2 high-entropy alloys

A series of cost effective Co-free AlxCrCuFeNi2 high entropy alloys were developed, following the valence electron concentration rule. The solidification microstructure in these alloys showed some anomalies that were rarely seen in other high entropy alloys or multi-component alloys. Specifically, submicron rod-like microstructures existed in the eutectic alloy in spite of the high volume percentage of the rod-like phase; sunflower-like microstructures existed in the hyper-eutectic alloys, with 200 nm sized spinodal decomposed seed particles densely distributed in the disk floret. (c) 2013 Elsevier B.V. All rights reserved.

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

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

[3]  J. Yeh.  Recent progress in high-entropy alloys , 2006 .

[4]  J. Yeh,et al.  Microstructure characterization of AlxCoCrCuFeNi high-entropy alloy system with multiprincipal elements , 2005 .

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

[6]  B. S. Murty,et al.  Analysis of phase formation in multi-component alloys , 2012 .

[7]  B. Cantor,et al.  Microstructural development in equiatomic multicomponent alloys , 2004 .

[8]  Martin E. Glicksman,et al.  Principles of Solidification: An Introduction to Modern Casting and Crystal Growth Concepts , 2010 .

[9]  J. Yeh,et al.  Microstructure and wear behavior of AlxCo1.5CrFeNi1.5Tiy high-entropy alloys , 2011 .

[10]  Ronald D. Noebe,et al.  Modeling of ternary element site substitution in NiAl , 2000 .

[11]  J. B. Zhu,et al.  Microstructure and the properties of FeCoCuNiSnx high entropy alloys , 2012 .

[12]  J. Yeh,et al.  Effects of Al addition on the microstructure and mechanical property of AlxCoCrFeNi high-entropy alloys , 2012 .

[13]  Peter Y. Zavalij,et al.  Fundamentals of Powder Diffraction and Structural Characterization of Materials, Second Edition , 2003 .

[14]  Zhiyuan Liu,et al.  Micromechanical characterization of casting-induced inhomogeneity in an Al0.8CoCrCuFeNi high-entropy alloy , 2011 .

[15]  J. Yeh,et al.  Hydrogen storage properties of multi-principal-component CoFeMnTixVyZrz alloys , 2010 .

[16]  Y. Zhou,et al.  Solid solution alloys of AlCoCrFeNiTix with excellent room-temperature mechanical properties , 2007 .

[17]  Nikita Stepanov,et al.  Tensile properties of an AlCrCuNiFeCo high-entropy alloy in as-cast and wrought conditions , 2012 .

[18]  J. Yeh,et al.  Effect of temperature on mechanical properties of Al0.5CoCrCuFeNi wrought alloy , 2010 .

[19]  Yong Zhang,et al.  TENSILE AND COMPRESSIVE MECHANICAL BEHAVIOR OF A CoCrCuFeNiAl0.5 HIGH ENTROPY ALLOY , 2009 .

[20]  Sheng Guo,et al.  Entropy-driven phase stability and slow diffusion kinetics in an Al0.5CoCrCuFeNi high entropy alloy , 2012 .

[21]  B. S. Murty,et al.  Decomposition in multi-component AlCoCrCuFeNi high-entropy alloy , 2011 .

[22]  D. P. Woodruff,et al.  The solid-liquid interface , 1974 .

[23]  Jien-Wei Yeh,et al.  Industrial development of high-entropy alloys , 2006 .

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

[25]  Shou-Yi Chang,et al.  10-nm-thick quinary (AlCrTaTiZr)N film as effective diffusion barrier for Cu interconnects at 900 °C , 2009 .

[26]  T. Shun,et al.  Microstructure and tensile behaviors of FCC Al0.3CoCrFeNi high entropy alloy , 2009 .

[27]  J. Yeh,et al.  Microstructures and Mechanical Performance of Plasma-Nitrided Al0.3CrFe1.5MnNi0.5 High-Entropy Alloys , 2012, Metallurgical and Materials Transactions A.

[28]  Shou-Yi Chang,et al.  Anomalous decrease in X-ray diffraction intensities of Cu–Ni–Al–Co–Cr–Fe–Si alloy systems with multi-principal elements , 2007 .