Combining thermodynamic modeling and 3D printing of elemental powder blends for high-throughput investigation of high-entropy alloys – Towards rapid alloy screening and design

High-entropy alloys have gained high interest of both academia and industry in recent years due to their excellent properties and large variety of possible alloy systems. However, so far prediction of phase constitution and stability is based on empirical rules that can only be applied to selected a...

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Veröffentlicht in:Materials science & engineering. A, Structural materials : properties, microstructure and processing Structural materials : properties, microstructure and processing, 2017-03, Vol.688, p.180-189
Hauptverfasser: Haase, Christian, Tang, Florian, Wilms, Markus B., Weisheit, Andreas, Hallstedt, Bengt
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container_start_page 180
container_title Materials science & engineering. A, Structural materials : properties, microstructure and processing
container_volume 688
creator Haase, Christian
Tang, Florian
Wilms, Markus B.
Weisheit, Andreas
Hallstedt, Bengt
description High-entropy alloys have gained high interest of both academia and industry in recent years due to their excellent properties and large variety of possible alloy systems. However, so far prediction of phase constitution and stability is based on empirical rules that can only be applied to selected alloy systems. In the current study, we introduce a methodology that enables high-throughput theoretical and experimental alloy screening and design. As a basis for thorough thermodynamic calculations, a new database was compiled for the Co–Cr–Fe–Mn–Ni system and used for Calphad and Scheil simulations. For bulk sample production, laser metal deposition (LMD) of an elemental powder blend was applied to build up the equiatomic CoCrFeMnNi Cantor alloy as a first demonstrator. This production approach allows high flexibility in varying the chemical composition and, thus, renders itself suitable for high-throughput alloy production. The microstructure, texture, and mechanical properties of the material processed were characterized using optical microscopy, EBSD, EDX, XRD, hardness and compression testing. The LMD-produced alloy revealed full density, strongly reduced segregation compared to conventionally cast material, pronounced texture, and excellent mechanical properties. Phase constitution and elemental distribution were correctly predicted by simulations. The applicability of the introduced methodology to high-entropy alloys and extension to compositionally complex alloys is discussed.
doi_str_mv 10.1016/j.msea.2017.01.099
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subjects 3-D printers
Additive manufacturing
Alloy systems
Alloying elements
Alloys
Calphad
Cobalt
Compression tests
Computer simulation
Constitution
Entropy
High entropy alloys
Iron
Laser deposition
Laser metal deposition
Manganese
Mechanical properties
Microstructure
Mixtures
Nickel
Optical microscopy
Optical properties
Phase transitions
Predictions
Rapid alloy development
Screening
Texture
Thermodynamic modeling
Thermodynamics
Three dimensional models
Three dimensional printing
title Combining thermodynamic modeling and 3D printing of elemental powder blends for high-throughput investigation of high-entropy alloys – Towards rapid alloy screening and design
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