Designing novel lightweight, high-strength and high-plasticity Ti (AlCrNb)100- medium-entropy alloys

Liao, Y.C.; Li, T. H.; Tsai, P.H.; Jang, Jae-il; Hsieh, Ker-Chang; Chen, Chih-Yen; Huang, J.C.; Wu, Hsin‐Jay; Lo, Yu‐Chieh; Huang, Chung-Huei; Tsao, I-Yu

doi:10.1016/j.intermet.2019.106673

Cited by 49 publications

(21 citation statements)

References 43 publications

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“…General plot of HV against compressive yield strength for several single‐phase BCC HEAs. [ 30,67,88–104 ] The referenced three‐time line is included.…”

Section: Resultsmentioning

confidence: 99%

“…Among the limited data of BCC HEAs, the tensile

σ_{YS}

is reported to be comparable with compressive

σ_{YS}

for a Ti 65 (AlCrNb) 35 BCC HEA, so Figure 3 can be reproduced if the compressive

σ_{YS}

was replaced by the tensile

σ_{YS}

. [ 67 ] Meanwhile, the scattered data in Figure 3 can be induced by multiple factors. First, the lowest yield strengths of these BCC HEAs are much higher than FCC HEAs, and the data points gather in a narrow area, reducing the accuracy of fitted line.…”

Section: Resultsmentioning

confidence: 99%

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Correlating Strength and Hardness of High‐Entropy Alloys

Tian

et al. 2021

Adv Eng Mater

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Strength and hardness of metallic materials are reported to correlate in a specified form. Among various equations, yield strength is generally converted from Vickers hardness (HV) via a three‐time relation due to the simple and nondestructive nature of hardness testing. Herein, a through literature review is made and data of strength and HV for face‐centered cubic (FCC) and body‐centered cubic (BCC) high‐entropy alloys (HEA) are collected. The yield strength and HV visibly deviate from the three‐time relation, but the ultimate tensile strength and HV roughly follow the three‐time relation. New linear relationships, which are universally applied to convert HV to yield strength and ultimate tensile strength, are proposed.

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“…General plot of HV against compressive yield strength for several single‐phase BCC HEAs. [ 30,67,88–104 ] The referenced three‐time line is included.…”

Section: Resultsmentioning

confidence: 99%

“…Among the limited data of BCC HEAs, the tensile

σ_{YS}

is reported to be comparable with compressive

σ_{YS}

for a Ti 65 (AlCrNb) 35 BCC HEA, so Figure 3 can be reproduced if the compressive

σ_{YS}

was replaced by the tensile

σ_{YS}

Section: Resultsmentioning

confidence: 99%

Correlating Strength and Hardness of High‐Entropy Alloys

Tian

et al. 2021

Adv Eng Mater

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“…A series of Ti x (AlCrNb) 100-x alloys containing a BCC structure were designed by Liao et al [66]. Their densities are comparable to that of commercial titanium alloys, around 5 g/cm 3 .…”

Section: Light-weight High-entropy Alloys (Lwheas)mentioning

confidence: 99%

A review of the design of high-entropy aluminum alloys: a pathway for novel Al alloys

et al. 2021

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Aluminum (Al) alloys are of great importance and interest because of their extensive applications in various engineering fields. Lightweighting of our infrastructure has been a driver for more than the last two decades as our need to reduce carbon footprint on a global scale has become an inevitable reality. As a result, we have witnessed much progress in alloy development in Al alloys, especially with the advent of Integrated Computational Materials Engineering (ICME) and other computational tools. However, the limitations of the properties one may attain through alloy development to date have relied on the traditional solvent/solute model, where the matrix is Al with additions of elements (solute) to the matrix. Despite making much progress, we are still lockedin to the strength-ductility curve without any appreciable increase in modulus (stiffness) of the alloy. High Entropy Alloys (HEAs) provide a new paradigm as they differ from conventional alloys in entropy-based mixing logic of various elements, which is different from the solvent/solute model. HEAs offer the opportunity to move out of the strength-ductility curve as well as the opportunity to increase the alloy's modulus. In this paper, we present a retrospective view of Al alloys, followed with an understanding of the principles of HEAs, and lastly, with the idea of applying high entropy concept to conventional Al alloys to develop a novel Al alloy category, which we have coined HEAl. Preliminary results with a commentary on potential future opportunities are also given.

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“…Elements with a low density such as Al, Be, Li, Mg, Ti, and Zn are usually used, as well, however, as other elements with higher density. Therefore, some alloys based on 3d elements [24] and RHEAs [25,26] can be also considered as LDHEAs.…”

Section: Introductionmentioning

confidence: 99%

Structure and mechanical properties of a low-density AlCrFeTi medium entropy alloy produced by spark plasma sintering

Shaysultanov

Непапушев

Zherebtsov

et al. 2020

Materials Science and Engineering: A

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Bulk equiatomic AlCrFeTi medium entropy alloy was produced by mechanical alloying (MA) and spark plasma sintering (SPS). Powders with a homogeneous chemical composition composed of amorphous and bcc phases were obtained due to MA. Bulk, almost porosity free specimen of the alloy with the measured density of 5.53 ± 0.07 g × cm − 3 was obtained after SPS. A mixture of a (Fe, Ti)-rich C14 Laves phase, a Cr-rich bcc phase, and an Al-rich L1 2 phase was found in the as-sintered specimens. The average size of grains/particles of the different phases was 115 ± 100 nm. Annealing at 1000 • С resulted in some coarsening of the microstructure to the grain/ particle size of 140 ± 120 nm and in an increase in the fraction of the bcc and L1 2 phases, yet the microstructure was found to be relatively stable. After SPS the AlCrFeTi alloy had a high microhardness of 1090 ± 120 HV, which decreased after annealing to 870 ± 70 HV. Compression tests have meanwhile revealed low ductility of the alloy after SPSthe alloy exhibited brittle fracture at room temperature and became ductile at only 800 • C. After annealing the alloy demonstrated reasonable ductility already at 700 • C. Also, the annealed alloy had a remarkable specific yield strength of 258 kPa × m 3 /kg at 700 • C. The experimental data on the phase composition of the alloy was compared with the Thermo-Calc predictions, and the relationships between the structure and properties of the alloy were discussed.

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Designing novel lightweight, high-strength and high-plasticity Ti (AlCrNb)100- medium-entropy alloys

Cited by 49 publications

References 43 publications

Correlating Strength and Hardness of High‐Entropy Alloys

Correlating Strength and Hardness of High‐Entropy Alloys

A review of the design of high-entropy aluminum alloys: a pathway for novel Al alloys

Structure and mechanical properties of a low-density AlCrFeTi medium entropy alloy produced by spark plasma sintering

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