Compound Formation and Microstructure of As-Cast High Entropy Aluminums

Sánchez, Jon Mikel; Vicario, Iban; Albizuri, Joseba; Guraya, Teresa; Koval, Natalia; García, Joaquín de Nova

doi:10.3390/met8030167

Cited by 21 publications

(7 citation statements)

References 33 publications

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“…1, the thermodynamic calculations of equilibrium phases as a function of temperature were calculated using Thermo-Calc software and TCAL5 database 43 . According to previous works 44–46 , the use of this database in Al-based HEAs and CCAs shows a good agreement with the experimental results. It should be noted that calculations were made for homogeneous alloys and not considering impurities, casting defects or oxides formed during the casting process.…”

Section: Resultssupporting

confidence: 84%

Design, Microstructure and Mechanical Properties of Cast Medium Entropy Aluminium Alloys

Sánchez

Vicario

Albizuri

et al. 2019

Sci Rep

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In this work, the design, microstructures and mechanical properties of five novel non-equiatomic lightweight medium entropy alloys were studied. The manufactured alloys were based on the Al 65 Cu 5 Mg 5 Si 15 Zn 5 X 5 and Al 70 Cu 5 Mg 5 Si 10 Zn 5 X 5 systems. The formation and presence of phases and microstructures were studied by introducing Fe, Ni, Cr, Mn and Zr. The feasibility of CALPHAD method for the design of new alloys was studied, demonstrating to be a good approach in the design of medium entropy alloys, due to accurate prediction of the phases, which were validated via X-ray diffraction and scanning electron microscopy with energy dispersive spectroscopy. In addition, the alloys were manufactured using an industrial-scale die-casting process to make the alloys viable as engineering materials. In terms of mechanical properties, the alloys exhibited moderate plastic deformation and very high compressive strength up to 644 MPa. Finally, the reported microhardness value was in the range of 200 HV 0.1 to 264 HV 0.1 , which was two to three times higher than those of commercial Al alloys.

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Section: Resultssupporting

confidence: 84%

Design, Microstructure and Mechanical Properties of Cast Medium Entropy Aluminium Alloys

Sánchez

Vicario

Albizuri

et al. 2019

Sci Rep

Self Cite

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“…Jia et al investigated the AlLiMgCaSi high-entropy alloys and they found that the density of these alloys were 1.46 to 1.70 g/cm 3 and the strength was higher than 450 MPa, especially, as the Al 15 .5 Si 0.5 alloy exhibited good plasticity ~45 and ~60%, which is much higher than most of the lightweight high-entropy alloys [26]. Sanchez et al investigated on the as-cast high-entropy aluminums, and they found these alloys showed high hardness than other lightweight alloys [27,28]. Figure 6 shows the area of lightweight high-entropy alloys in the Ashby diagram of strength vs. density for structural materials, which we found that the strength of lightweight high-entropy alloys was much higher and the density much lower than some ceramics such as the SiC, Al 3 N, etc.…”

Section: Other Lightweight High-entropy Alloy Systemsmentioning

confidence: 99%

Light-Weight and Flexible High-Entropy Alloys

Li¹,

Zhang²

2020

Engineering Steels and High Entropy-Alloys

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The lightweight and flexible materials can improve people's quality of daily life; in addition, the materials can be widely used in aerospace, automotive, consumer electronics, etc. Recently, high-entropy alloys had become hot issues in materials science with many excellent properties; therefore, we can combine the design ideas of highentropy alloys with lightweight materials and flexible materials, taking into account the advantages of two types of materials, and promoting the development and progress of new materials. In the chapter, we will elaborate on the relationship between the microstructure and properties of lightweight high-entropy alloys and the design ideas of high-entropy alloys with flexible materials that were investigated in recent years. Furthermore, as the microstructure and mechanical properties of the alloys exhibit the nonlinear behaviors with entropy on high-entropy alloys, we would like to define the lightweight high-entropy alloy as the density is lower than 6 g/cm 3 , the mix-entropy of these alloys is higher than 1R (here, R is gas constant), and the number of components is four or more. Finally, it is expected to broaden the research field of high-entropy alloys and provide some new directions for the development of new materials.

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“…As an inexpensive and lightweight semi-metal element, Si element is added to the aluminum alloy to improve the mechanical properties of the alloy [2,5,[25][26][27] . Since Mg and Si are liable to form a high melting point intermetallic compound, for traditional cast aluminum alloys, the Mg/Si ratio has always been strictly controlled variable [28,29] .…”

Section: Alloy Designmentioning

confidence: 99%

Effects of Si Addition on Microstructure, Properties and Serration Behaviors of Lightweight Al-Mg-Zn-Cu Medium-entropy Alloys

Li¹,

Li²,

Zhang³

2019

Res. Appl. Mater. Sci.

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A series of as-cast lightweight multicomponent alloys Al(86-x)Mg10Zn2Cu2Six (x=0, 0.3, 0.6, 0.9, 1.2 at.%) were prepared by a vacuum induction furnace with a steel die. With the addition of Si, the reticular white Al-Cu phase deposited were gradually replaced by the gray eutectic Mg-Si phase, while the compressive strength of the alloys increases first and then decreases slowly. It is particularly noteworthy that the compression plasticity also exhibits this trend. When the Si content is 0.9 at.%, the compressive strength reaches its maximum at 779.11 MPa and the compressive plasticity reaches 20.91%. The effect of the addition of Si on the serration behavior of alloy was also studied; we found that the addition of Si introduces a new MgSi phase, and with the change of Si is significantly affects the morphology of the precipitated phase, which affects the serration behavior of the alloys. The comprehensive mechanical properties of the alloy are optimal at the critical point where the serration behavior disappears. In this work, we have provided a method and a composition for the preparation of a low-cost, high-strength, lightweight medium-entropy alloys.

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Compound Formation and Microstructure of As-Cast High Entropy Aluminums

Abstract: The aim of this work is to study the microstructure of four high entropy alloys (HEAs) produced by large scale vacuum die casting.

Cited by 21 publications

References 33 publications

Design, Microstructure and Mechanical Properties of Cast Medium Entropy Aluminium Alloys

Design, Microstructure and Mechanical Properties of Cast Medium Entropy Aluminium Alloys

Light-Weight and Flexible High-Entropy Alloys

Effects of Si Addition on Microstructure, Properties and Serration Behaviors of Lightweight Al-Mg-Zn-Cu Medium-entropy Alloys

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