Effect of hot isostatic pressing on the microstructure and mechanical properties of additive manufactured AlxCoCrFeNi high entropy alloys

Joseph, Jithin; Hodgson, Peter; Jarvis, Tom; Wu, Xinhua; Stanford, Nicole; Fabijanic, Daniel

doi:10.1016/j.msea.2018.07.036

Cited by 130 publications

(32 citation statements)

References 47 publications

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“…The SEBM sample along the BDs exhibited improved properties, but the reduced yield strength and plasticity were found in samples perpendicular to the build direction (BD). Moreover, their compressive properties were much higher than the tensile properties, which was consistent with previous studies [ 68 ]. As previously discussed, FCC and B2 ordered phases existed in the SEBM materials.…”

Section: Mechanical Properties Of Am-processed Heassupporting

confidence: 92%

“…The XRD and SEM results suggest that the studied solid solution transforms from BCC to FCC structures, which is consistent with the casting HEAs [ 67 ]. Joseph et al [ 68 ] firstly proposed the HIP effect on the microstructure and mechanical behaviors in DLF Al x CoCrFeNi HEAs. The FCC, duplex FCC + BCC, and BCC solid solution were found in Al 0.3 CoCrFeNi, Al 0.6 CoCrFeNi, and Al 0.85 CoCrFeNi HEAs, respectively, which was similar to the casting specimens in previous reports [ 69 ].…”

Section: Microstructure Evolution During the Am Processmentioning

confidence: 99%

“…The HIP effects on mechanical properties were studied in the DLF Al x CoCrFeNi alloy ( x = 0.3, 0.6, and 0.85) [ 68 ]. The DLF/HIP Al 0.3 CoCrFeNi presented an enhanced ductility and work-hardening rate, without losing its yield strength.…”

Section: Mechanical Properties Of Am-processed Heasmentioning

confidence: 99%

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Additive Manufacturing of High-Entropy Alloys: A Review

Chen

Yang

Liaw

2018

Entropy

163

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Owing to the reduced defects, low cost, and high efficiency, the additive manufacturing (AM) technique has attracted increasingly attention and has been applied in high-entropy alloys (HEAs) in recent years. It was found that AM-processed HEAs possess an optimized microstructure and improved mechanical properties. However, no report has been proposed to review the application of the AM method in preparing bulk HEAs. Hence, it is necessary to introduce AM-processed HEAs in terms of applications, microstructures, mechanical properties, and challenges to provide readers with fundamental understanding. Specifically, we reviewed (1) the application of AM methods in the fabrication of HEAs and (2) the post-heat treatment effect on the microstructural evolution and mechanical properties. Compared with the casting counterparts, AM-HEAs were found to have a superior yield strength and ductility as a consequence of the fine microstructure formed during the rapid solidification in the fabrication process. The post-treatment, such as high isostatic pressing (HIP), can further enhance their properties by removing the existing fabrication defects and residual stress in the AM-HEAs. Furthermore, the mechanical properties can be tuned by either reducing the pre-heating temperature to hinder the phase partitioning or modifying the composition of the HEA to stabilize the solid-solution phase or ductile intermetallic phase in AM materials. Moreover, the processing parameters, fabrication orientation, and scanning method can be optimized to further improve the mechanical performance of the as-built-HEAs.

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Section: Mechanical Properties Of Am-processed Heassupporting

confidence: 92%

Section: Microstructure Evolution During the Am Processmentioning

confidence: 99%

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Additive Manufacturing of High-Entropy Alloys: A Review

Chen

Yang

Liaw

2018

Entropy

163

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“…This result indicates obviously that HEAs with specified internal microstructure can be easily manufactured using recent AMTs. Joseph et al [92] manufactured Al x CoCrFeNi HEAs (x = 0.3, 0.6, 0.85) through direct laser fabrication (DLF), DLF/HIPing, and arc melting (5 re-melts). Very fine elongated grains were obtained in the DLF method, somewhat coarse grains were obtained in DLF/HIPing method, and very big dendrites microstructures were obtained in the AM method (Fig.…”

Section: Plasma Spray Depositionmentioning

confidence: 99%

Manufacturing Methods, Microstructural and Mechanical Properties Evolutions of High-Entropy Alloys: A Review

et al. 2019

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High entropy alloys (HEAs) are being attracted recently by several researchers, scientists, and academicians to achieve extraordinary and outstanding properties that cannot be obtained from conventional alloys. HEAs are multicomponent alloys in which a minimum of five metallic elements are mixed in an equal molar or non-equal molar ratio. The rapid growth of this field produces a huge amount of scientific papers over the last decade. However, still, there is a need to review various manufacturing methods and their results. Also, the outcome of the scientific articles related to HEAs has ignored the various methods of synthesizing and manufacturing. In this review article, an attempt was made and largely concentrated on the methods and techniques that can be used in the manufacturing and synthesizing of the HEAs. Recently, the properties of HEAs become much better when compared to conventional alloys. Some techniques have succeeded in producing ultrafine microstructure grains which become a leap in industrial fields. Now, the manufacturing methods of conventional alloys are almost familiar and implemented according to the suggestions given by the researchers and academicians based on their work. Therefore, the present review article has demonstrated various methods of manufacturing of HEAs with novel schematics with a preview description for more understanding of the basic work criteria. Besides, this article has reviewed the outcomes of several research articles related to several methods, then compared the outcome of each method with the corresponding mechanical properties, and major challenges of HEAs are discussed and reported.

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“…Kinetics way of tailoring phases is significantly important for HEAs to obtain outstanding integrated performance. Al x CoCrFeNi (0 ≤ x ≤1) HEAs are one of the most commonly investigated alloys that owns very good properties and easily to be tunable by changing the Al content, heat treatment and forging [14][15][16][17][18][19][20][21][22][23].…”

Section: Introductionmentioning

confidence: 99%

Phase Transformation Kinetics of a FCC Al0.25CoCrFeNi High-Entropy Alloy during Isochronal Heating

Wang

Chen

Yang

et al. 2018

Metals

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The phase transformation kinetics of a face-centered-cubic (FCC) Al0.25CoCrFeNi high-entropy alloy during isochronal heating is investigated by thermal dilation experiment. The phase transformed volume fraction is determined from the thermal expansion curve, and results show that the phase transition is controlled by diffusion controlled nucleation-growth mechanism. The kinetic parameters, activation energy and kinetic exponent are determined based on Kissinger–Akahira–Sunose (KAS) and Johnson–Mehl–Avrami (JMA) method, respectively. The activation energy and kinetic exponent determined are almost constant, indicating a stable and slow speed of phase transition in the FCC Al0.25CoCrFeNi high-entropy alloy. During the main transformation process, the kinetic exponent shows that the phase transition is diffusion controlled process without nucleation during the transformation.

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Effect of hot isostatic pressing on the microstructure and mechanical properties of additive manufactured AlxCoCrFeNi high entropy alloys

Cited by 130 publications

References 47 publications

Additive Manufacturing of High-Entropy Alloys: A Review

Additive Manufacturing of High-Entropy Alloys: A Review

Manufacturing Methods, Microstructural and Mechanical Properties Evolutions of High-Entropy Alloys: A Review

Phase Transformation Kinetics of a FCC Al0.25CoCrFeNi High-Entropy Alloy during Isochronal Heating

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