What factors influence the cost-effectiveness of transition high entropy alloys compared to refractory high entropy alloys?
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The cost-effectiveness of transition high entropy alloys (HEAs) compared to refractory HEAs is influenced by several key factors. Transition HEAs like Fe35Ni35Cr20Mo5Al5 offer a cost-effective solution with exceptional mechanical properties and corrosion resistance at cryogenic temperatures . In contrast, refractory HEAs containing elements like Mo, W, Ta, Nb, Ti, and V are more expensive due to the high cost of these refractory elements . Additionally, the addition of elements like Mo and Nb in non-equimolar HEAs can lead to higher commodity costs and density, impacting the overall cost-effectiveness of the alloy . Therefore, the choice between transition and refractory HEAs depends on balancing cost considerations with the desired mechanical properties for specific applications.
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| Papers (5) | Insight |
|---|---|
| Transition high entropy alloys achieve cost-effectiveness by adjusting compositions to lower commodity costs, enhance phase stability, and improve mechanical and thermal performance, unlike refractory high entropy alloys. | |
| Cost-effective transition high entropy alloys like Fe35Ni35Cr20Mo5Al5 offer superior cryogenic properties with lower raw material costs compared to refractory high entropy alloys, enhancing their industrial application potential. | |
| Not addressed in the paper. | |
4 Citations | The cost-effectiveness of transition high entropy alloys over refractory high entropy alloys is influenced by the expense of refractory elements like Mo, W, Ta, Nb, Ti, and V. |
| The cost-effectiveness of transition high entropy alloys is influenced by the design of a cost-effective alloy with ultrafine microstructure, enhancing mechanical properties and corrosion resistance, as detailed in the paper. |
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What are the differences in the structure and properties of AlCoCrFeNi high-entropy alloy produced by MA and SPS methods?4 answersThe AlCoCrFeNi high-entropy alloy was produced using mechanical alloying (MA) and spark plasma sintering (SPS) methods. The MA method was used to prepare the alloy powder, and the SPS method was used to sinter the alloy block. The microstructure and phase structure of the alloy were investigated during the different stages of the production process. The MA process did not affect the alloying process of the powder, but it did reduce the particle size. The SPS process resulted in a transition from a dual-phase to a single FCC phase structure, and increasing the temperature during sintering improved the mechanical properties of the alloy. The alloy produced by SPS had a higher density and hardness compared to the alloy produced by MA. Overall, the SPS method resulted in a more refined microstructure and improved mechanical properties of the AlCoCrFeNi high-entropy alloy.
How much rare earth metals should be added in high entropy alloys?4 answersHigh entropy alloys can contain varying amounts of rare earth metals. Some high entropy alloys include at least four and up to twelve rare earth elements, such as elements 57 to 60, 62 to 70, 39, and 40 of the periodic system. Another high entropy alloy consists of 10-12 at% of Al, 26-28 at% of Co, 45-47 at% of Cr, 15-17 at% of Ni, and inevitable impurities. Additionally, a high entropy alloy can comprise 3-15 atom% of V, 3-15 atom% of Cr, 35-48 atom% of Fe, 10-35 atom% of Co, and 7.5 atom% or less of Mn. Furthermore, a high entropy alloy may contain 21-25 atom% of Al, 21-25 atom% of Co, 21-25 atom% of Cr, 21-25 atom% of Ni, 0-8 atom% of Mn, 0-8 atom% of V, and inevitable impurities. Finally, a rare earth high-entropy alloy for magnetic refrigeration can be formed using five different rare earth elements of the lanthanide series.
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What is the influence of Si addition to high entropy alloys?3 answersThe addition of silicon (Si) to high entropy alloys (HEAs) has been found to have various influences. Si addition to AlCoCrFeNi HEAs promotes the formation of a body-centered cubic (BCC) phase, whereas without Si, a mixed BCC and face-centered cubic (FCC) phase is observed ^[Kumar et al.]. Si addition to CoCrFeNiNbX HEAs leads to the formation of oxide particles and Cr7C3 carbides, and the fraction of the FCC solid solution decreases with increasing Si content ^[Kolarik et al.]. Si addition to CoCrFeNi HEAs enhances the yield strength, ultimate strength, and ductility of the alloy, due to enhanced solid solution strengthening and reduced stacking fault energy ^[Wei et al.]. Si addition to Gd20Dy20Er20Co20Al20 HE-BMGs improves the glass-forming ability (GFA) by enhancing nanoscale heterogeneity of elemental distribution and promoting the formation of stable network structures ^[Shao et al.]. Overall, Si addition to HEAs can influence phase formation, mechanical properties, and glass-forming ability.