Microstructure and Compressive Properties of NbTiVTaAlx High Entropy Alloys

Yang, Xiawei; Zhang, Yong; Liaw, Peter K.

doi:10.1016/j.proeng.2012.03.043

Cited by 226 publications

(78 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…These BCC solid solutions have high strength ranging from 900 to 1,350 MPa. [37,101,105,106] Interestingly, such strength is several times higher than that of the weighted average strength of the composing elements. For example, the rule-of-mixture hardness of MoNbTaVW and HfNbTaTiZr are 1,596 and 1,165 MPa, respectively.…”

Section: 4mentioning

confidence: 91%

See 1 more Smart Citation

High-Entropy Alloys: A Critical Review

Tsai

Yeh

2014

Materials Research Letters

2,518

853

View full text Add to dashboard Cite

High-entropy alloys (HEAs) are alloys with five or more principal elements. Due to the distinct design concept, these alloys often exhibit unusual properties. Thus, there has been significant interest in these materials, leading to an emerging yet exciting new field. This paper briefly reviews some critical aspects of HEAs, including core effects, phases and crystal structures, mechanical properties, high-temperature properties, structural stabilities, and corrosion behaviors. Current challenges and important future directions are also pointed out.

show abstract

Section: 4mentioning

confidence: 91%

“…Some researchers developed HEAs that are based on totally different elements. The most notable system is the refractory HEA system developed by Senkov et al [10,37,54,[101][102][103][104][105][106] These alloys are composed mainly of refractory elements such as Cr, Hf, Mo, Nb, Ta, V, W, and Zr. The major phase in these alloys is typically BCC.…”

Section: 4mentioning

confidence: 99%

High-Entropy Alloys: A Critical Review

Tsai

Yeh

2014

Materials Research Letters

2,518

853

View full text Add to dashboard Cite

show abstract

“…1(b), with an Al addition in the range of 0-1, disordered Bcc remains as the only solid phase that forms via solidification, which agrees with the experimental observations in as-cast Al xNb 1 Ta 1 Ti 1 V 1 (0 \ x \ 1) alloys. [27] It should be noted that the Al addition noticeably stabilizes the sigma phase and makes it possible for the sigma phase to form during nonequilibrium solidification at high Al contents.…”

Section: Typical Bcc Systemsmentioning

confidence: 98%

TCHEA1: A Thermodynamic Database Not Limited for “High Entropy” Alloys

Mao

Chen²,

Chen³

2017

J. Phase Equilib. Diffus.

125

View full text Add to dashboard Cite

In this paper we report a thermodynamic database which was developed by using the CALPHAD approach. The TCHEA1 database includes 15 chemical elements (Al, Co, Cr, Cu, Fe, Hf, Mn, Mo, Nb, Ni, Ta, Ti, V, W and Zr). It is suitable for the study of Bcc and Fcc HEA systems. The database is constructed based on the thermodynamic assessment of all binary systems and many key ternary systems where almost all possible metastable and stable phases are considered. It is extensively demonstrated in the present work that TCHEA1 gives satisfactory prediction on the phase equilibria in various HEA systems (quaternary to ennead) and wide temperature ranges (liquidus to subsolidus). Thermodynamic stability calculations of simple solid solutions (Bcc and Fcc) and intermetallics (sigma, Laves, l-phase etc.) are validated against the available experimental information in as-cast or as-annealed state. Such CALPHAD database focusing on the modelling of Gibbs energy rather than entropy makes reliable predictions of thermodynamic equilibrium and phase transformation, no matter whether the alloy/system has high entropy or not. Cases with miscibility gap in liquid and solid solutions and second-order phase transition at low temperatures are demonstrated. With the volume data included, TCHEA1 is capable to predict the density and thermal expansion coefficient of HEAs as well. This thermodynamic database is also applicable in process simulations when used together with compatible kinetic databases.

show abstract

“…Many multi-principal-element alloys have shown exceptional properties, including high strengths at elevated temperatures 6,8,[10][11][12][13][14][15] , ductility 16,17 , toughness 18 , resistance to corrosion 19,20 , wear 21 and fatigue 22 . These favourable properties are sometimes associated with the locally strained solid solution structures, especially those with simple, single-phase microstructures 5,23,24 .…”

mentioning

confidence: 99%

Deviation from high-entropy configurations in the atomic distributions of a multi-principal-element alloy

et al. 2015

View full text Add to dashboard Cite

The alloy-design strategy of combining multiple elements in near-equimolar ratios has shown great potential for producing exceptional engineering materials, often known as 'high-entropy alloys'. Understanding the elemental distribution, and, thus, the evolution of the configurational entropy during solidification, is undertaken in the present study using the Al 1.3 CoCrCuFeNi model alloy. Here we show that, even when the material undergoes elemental segregation, precipitation, chemical ordering and spinodal decomposition, a significant amount of disorder remains, due to the distributions of multiple elements in the major phases. The results suggest that the high-entropy alloy-design strategy may be applied to a wide range of complex materials, and should not be limited to the goal of creating single-phase solid solutions.

show abstract

Microstructure and Compressive Properties of NbTiVTaAlx High Entropy Alloys

Cited by 226 publications

References 13 publications

High-Entropy Alloys: A Critical Review

High-Entropy Alloys: A Critical Review

TCHEA1: A Thermodynamic Database Not Limited for “High Entropy” Alloys

Deviation from high-entropy configurations in the atomic distributions of a multi-principal-element alloy

Contact Info

Product

Resources

About