Development of a novel light weight Al35Cr14Mg6Ti35V10 high entropy alloy using mechanical alloying and spark plasma sintering

Chauhan, Pranjal; Yebaji, Sushil; Nadakuduru, Vijay N.; Shanmugasundaram, T.

doi:10.1016/j.jallcom.2019.153367

Cited by 57 publications

(18 citation statements)

References 16 publications

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“…Additionally, the density of the present LWHEA is almost 50% lesser as compared to high strength Inconel 718 (8.19 g cm − 3 ), and similar to popular Ti6Al4V (~ 4.43 g cm −3 ) alloy. Our manufactured LWHEA does not contain toxic or expensive elements, such as V, Li, Be, Cr or Zn unlike others [8][9][10]34]. It means our LWHEA promises an economical way to produce LWHEA by an advanced powder metallurgy route.…”

Section: Strength and Densitymentioning

confidence: 99%

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Lightweight AlCuFeMnMgTi High Entropy Alloy with High Strength-to-Density Ratio Processed by Powder Metallurgy

Chae

Sharma

et al. 2020

Met. Mater. Int.

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In this study, we synthesized a new Al 16.6 Cu 16.6 Fe 16.6 Mn 16.6 Mg 16.6 Ti 16.6 lightweight high entropy alloy (LWHEA) by high energy ball milling and spark plasma sintering (SPS). The effect of milling time (15, 30, 45, and 60 h) and SPS conditions (600 and 700 °C) on microstructure, hardness, and density of LWHEAs were studied. The results showed that milled LWHEA is base centered cubic (BCC) structured, consisting of dual BCC1/BCC2 matrix with dispersed minor Cu 2 Mg precipitates and Ti. After SPS of milled samples, the BCC2 phase fraction was increased gradually. The distribution of Ti was uniform up to 45 h milled sample SPSed at 600 °C. However, porosity was built up beyond 45 h milling and higher SPS temperature (700 °C). The presence of finer secondary phases in the HEA matrix contributes to the dispersion hardening. The optimum microhardness and density of LWHEA AlCuFeMnMgTi were around 770 HV and 4.34 g cm − 3 which is superior to other conventional alloys such as Al or Ti-based alloys.

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Section: Strength and Densitymentioning

confidence: 99%

“…Comparison of a density and b microhardness of powder metallurgy processed HEAs[9,[33][34][35][36][37][38][39][40].…”

mentioning

confidence: 99%

Lightweight AlCuFeMnMgTi High Entropy Alloy with High Strength-to-Density Ratio Processed by Powder Metallurgy

Chae

Sharma

et al. 2020

Met. Mater. Int.

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“…Many other empirical parameters have also been used to predict the phase formation and stability in HEA systems. [ 20 ]…”

Section: Introductionmentioning

confidence: 99%

“…Many other empirical parameters have also been used to predict the phase formation and stability in HEA systems. [20] While many studies till date have focused on single-phase HEA systems, [21] dual-or multiphase alloys are usually required to meet demanding property portfolios such as in the development of high-temperature structural materials. [22][23][24] However, the mere presence of secondary phases in the system may not ensure an enhancement of properties.…”

Section: Introductionmentioning

confidence: 99%

Quantitative Phase Prediction in Dual‐Phase High‐Entropy Alloys: Computationally Aided Parametric Approach

Negi

Sourav

Heilmaier

et al. 2021

Physica Status Solidi (b)

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Dual‐phase high‐entropy alloys (HEAs) have shown remarkable mechanical properties. However, type and fraction of the secondary phase play a significant role in determining their physical and mechanical properties. CALPHAD is generally used to predict the phases and their fraction in HEAs. Herein, a parameter‐based empirical model is used to predict the phase fraction in dual‐phase HEAs. Valence electron concentration and various measures of atomic size mismatch are utilized for that purpose. A new parameter, namely, critical mismatch factor (δnormalC), is proposed in this work. Experimental verification is done on a series of AlxCoCrFeNi (x = 0.3, 0.5, 0.7) alloys synthesized by vacuum arc melting. Phase fraction is determined by X‐ray diffraction and electron backscatter diffraction analysis. The experimentally determined volume fraction of BCC phase in Al0.3, Al0.5, and Al0.7 is 0%, 6%, and 28–37%, respectively, which agrees closely with the predicted values proving the chosen approach useful.

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“…Thus, HEAs have emerged as a new type of functional and structural metallic materials with the idea of multi-principal elements in an equimolar or near equimolar ratio to maximise the configurational entropy (ΔS config ) of a solid-solution phase [ 1 , 2 ]. In most cases, HEAs form simple crystalline structures of body-centred cubic (BCC) or face-centred cubic (FCC) types but also, less commonly, of hexagonal close-packed (HCP) type [ 3 , 4 , 5 , 6 ], thereby supressing in some cases the formation of intermetallic compounds with different properties due to the synergy between the constituent elements [ 7 ].…”

Section: Introductionmentioning

confidence: 99%

Design and Production of a New FeCoNiCrAlCu High-Entropy Alloy: Influence of Powder Production Method on Sintering

et al. 2021

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The structure of FeCoNiCrAl1.8Cu0.5 high-entropy alloys (HEA) obtained by two different routes has been studied. The selection of the composition has followed the Hume–Rothery approach in terms of number of itinerant electrons (e/a) and average atomic radius to control the formation of specific phases. The alloys were obtained either from a mixture of elemental powders or from gas-atomised powders, being consolidated in both cases by uniaxial pressing and vacuum sintering at temperatures of 1200 °C and 1300 °C. The characterization performed in the sintered samples from both types of powder includes scanning electron microscopy, X-ray diffraction, differential thermal analysis, and density measurements. It was found that the powder production techniques give similar phases content. However, the sintering at 1300 °C destroys the achieved phase stability of the samples. The phases identified by all techniques and confirmed by Thermo-Calc calculations are the following: a major Co-Ni-Al-rich (P1) BCC phase, which stays stable after 1300 °C sintering and homogenising TT treatments; a complex Cr-Fe-rich (P2) B2 type phase, which transforms into a sigma phase after the 1300 °C sintering and homogenising TT treatments; and a very minor Al-Cu-rich (P3) FCC phase, which also transforms into Domain II and Domain III phases during the heating at 1300 °C and homogenising TT treatments.

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Development of a novel light weight Al35Cr14Mg6Ti35V10 high entropy alloy using mechanical alloying and spark plasma sintering

Cited by 57 publications

References 16 publications

Lightweight AlCuFeMnMgTi High Entropy Alloy with High Strength-to-Density Ratio Processed by Powder Metallurgy

Lightweight AlCuFeMnMgTi High Entropy Alloy with High Strength-to-Density Ratio Processed by Powder Metallurgy

Quantitative Phase Prediction in Dual‐Phase High‐Entropy Alloys: Computationally Aided Parametric Approach

Design and Production of a New FeCoNiCrAlCu High-Entropy Alloy: Influence of Powder Production Method on Sintering

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