Recent Progress in High Entropy Alloy Research

AbstractSince their discovery in 2004, high-entropy alloys (HEAs) have generated significant interest from the scientific community. Based on a multi-principal element design approach, HEAs are engineered to possess a unique random solid solution (RSS) crystalline structure, in which each of the constituent elements has an equal probability of occupying a given lattice site. Published literature reports that certain HEAs exhibit exceptional chemical, physical, mechanical and functional properties that are attributed to the presence of a RSS phase. Not surprisingly, research on HEAs has begun to expand at an accelerated rate. The scientific and engineering topics being studied include: experimentally measuring various properties in HEA systems, understanding the effect of the RSS on these properties, and developing methods for predicting the formation of RSS phases. Accordingly, the goal of this brief review is to introduce the field of HEAs, discuss their core concepts, highlight exceptional properties, and discuss current design aspects.

[1]  Jien-Wei Yeh,et al.  High-Entropy Alloys , 2014 .

[2]  Yuan Yuan,et al.  Rare-earth high-entropy alloys with giant magnetocaloric effect , 2017 .

[3]  D. Miracle,et al.  A critical review of high entropy alloys and related concepts , 2016 .

[4]  T. Chin,et al.  Formation of simple crystal structures in Cu-Co-Ni-Cr-Al-Fe-Ti-V alloys with multiprincipal metallic elements , 2004 .

[5]  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 .

[6]  I. Todd,et al.  The use of high-entropy alloys in additive manufacturing , 2015 .

[7]  Howard Stone,et al.  Research data supporting: "Precipitation in the Equiatomic High-Entropy Alloy CrMnFeCoNi" , 2015 .

[8]  T. Shun,et al.  Multi‐Principal‐Element Alloys with Improved Oxidation and Wear Resistance for Thermal Spray Coating , 2004 .

[9]  Jien-Wei Yeh,et al.  Nanostructured nitride films of multi-element high-entropy alloys by reactive DC sputtering , 2004 .

[10]  Baolong Zheng,et al.  Microstructure and strengthening mechanisms in an FCC structured single-phase nanocrystalline Co25Ni25Fe25Al7.5Cu17.5 high-entropy alloy , 2016 .

[11]  A. G. McGregor,et al.  Predicting the formation and stability of single phase high-entropy alloys , 2016 .

[12]  B. S. Murty,et al.  Ni tracer diffusion in CoCrFeNi and CoCrFeMnNi high entropy alloys , 2016 .

[13]  C. Woodward,et al.  Accelerated exploration of multi-principal element alloys with solid solution phases , 2015, Nature Communications.

[14]  H. Bei,et al.  Nano-twin Mediated Plasticity in Carbon-containing FeNiCoCrMn High Entropy Alloys , 2015 .

[15]  M. Gao,et al.  High-Entropy Alloys: Fundamentals and Applications , 2016 .

[16]  J. Yeh,et al.  Wear resistance and high-temperature compression strength of Fcc CuCoNiCrAl0.5Fe alloy with boron addition , 2004 .

[17]  Michael C. Gao,et al.  A Successful Synthesis of the CoCrFeNiAl0.3 Single-Crystal, High-Entropy Alloy by Bridgman Solidification , 2013 .

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

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

[20]  J. Yeh,et al.  High-Entropy Alloys: A Critical Review , 2014 .

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

[22]  N. Jones,et al.  High-entropy alloys: a critical assessment of their founding principles and future prospects , 2016 .

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

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

[25]  Huan Ma,et al.  Nanocrystalline High-Entropy Alloys: A New Paradigm in High-Temperature Strength and Stability. , 2017, Nano letters.

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

[27]  Howard J. Stone,et al.  An assessment of the lattice strain in the CrMnFeCoNi high-entropy alloy , 2017 .

[28]  J. Yeh,et al.  Sluggish diffusion in Co-Cr-Fe-Mn-Ni high-entropy alloys , 2013 .

[29]  G. Eggeler,et al.  The influences of temperature and microstructure on the tensile properties of a CoCrFeMnNi high-entropy alloy , 2013 .

[30]  R. Ritchie,et al.  A fracture-resistant high-entropy alloy for cryogenic applications , 2014, Science.