Tension/compression asymmetry in additive manufactured face centered cubic high entropy alloy

Joseph, Jithin; Stanford, Nicole; Hodgson, Peter; Fabijanic, Daniel

doi:10.1016/j.scriptamat.2016.10.023

Cited by 119 publications

(52 citation statements)

References 28 publications

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“…[30,[119][120][121][122][123][124] For example, Joseph et al found that the yield strength and ductility of DLDed Al x CoCrFeNi HEAs with different molar fractions of Al (x ¼ 0.3 and 0.85) were similar to their counterparts fabricated using arc melting due to their similar grain size, composition and texture. [30,[119][120][121][122][123][124] For example, Joseph et al found that the yield strength and ductility of DLDed Al x CoCrFeNi HEAs with different molar fractions of Al (x ¼ 0.3 and 0.85) were similar to their counterparts fabricated using arc melting due to their similar grain size, composition and texture.…”

Section: Mechanical Propertiesmentioning

confidence: 99%

“…[119] In addition, the strength of the DLDed HEA increased with increasing the Al content. [124] The underlying reason for the exceptionally high work hardening in compression was attributed to the mechanical twinning which was exacerbated by the strong texture in the fabricated HEAs. [119] In another study reported by Joseph et al on the DLDed Al 0.3 CoCrFeNi HEAs, the fabricated HEA exhibited significant tension and compression asymmetry in both work hardening and ductility although the yield strength remained similar in tension and compression ( Figure 17).…”

Section: Mechanical Propertiesmentioning

confidence: 99%

“…The underlying reason was partially attributed to the increased negative enthalpy of mixing in the system, larger density gradient and heavy lattice distortion but mainly due to the dense population of spinodal precipitates, which resulted in precipitation hardening. [124] During tension, since there was no mechanical twinning and the HEAs was deformed mainly by slip, only minimal work hardening and poor ductility were observed. [124] The underlying reason for the exceptionally high work hardening in compression was attributed to the mechanical twinning which was exacerbated by the strong texture in the fabricated HEAs.…”

Section: Mechanical Propertiesmentioning

confidence: 99%

“…[119] In another study reported by Joseph et al on the DLDed Al 0.3 CoCrFeNi HEAs, the fabricated HEA exhibited significant tension and compression asymmetry in both work hardening and ductility although the yield strength remained similar in tension and compression ( Figure 17). [124] The influence of Al/Ni ratio on the hardness of the DLDed AlFeCoCrNi HEA was investigated by Sistla et al [120] The hardness decreased from 670 to 149 Hv as the Al/Ni ratio decreased. [124] During tension, since there was no mechanical twinning and the HEAs was deformed mainly by slip, only minimal work hardening and poor ductility were observed.…”

Section: Mechanical Propertiesmentioning

confidence: 99%

“…a) The true stress-strain curve under tensile and compressive loading, b) macrostructure of compression deformed specimen to a true strain of 1.0, and c) SEM microstructure of the grain boundary crack in the tensile deformed specimen of Al 0.3 CoCrFeNi alloy [124]. Reproduced with permission from Elsevier [ref.…”

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confidence: 99%

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Additive Manufacturing of Advanced Multi‐Component Alloys: Bulk Metallic Glasses and High Entropy Alloys

2017

Adv Eng Mater

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Bulk metallic glasses (BMGs) and high entropy alloys (HEAs) are both important multi-component alloys with novel microstructures and unique properties, which make them promising for applications in many industries. However, certain hindrances have been identified in the fabrication of BMGs and HEAs by conventional techniques due to the intrinsic requirements of BMGs and HEAs. With the advent of metal additive manufacturing, new opportunities have been perceived to fabricate geometrically complex BMGs and HEAs with tailorable microstructure theoretically at any site within the specimen, which are not achievable using conventional fabrication techniques. After providing some background and introducing the conventional fabrication techniques for BMGs and HEAs, this review will focus on the current status, development, and challenges in metal additive manufacturing of BMGs and HEAs including different additive manufacturing techniques being used, microstructure design and evolution, as well as properties of the fabricated BMGs and HEAs. A future outlook of metal additive manufacturing of BMGs and HEAs will also be provided at the end.

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Section: Mechanical Propertiesmentioning

confidence: 99%

Section: Mechanical Propertiesmentioning

confidence: 99%

Section: Mechanical Propertiesmentioning

confidence: 99%

Section: Mechanical Propertiesmentioning

confidence: 99%

mentioning

confidence: 99%

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Additive Manufacturing of Advanced Multi‐Component Alloys: Bulk Metallic Glasses and High Entropy Alloys

2017

Adv Eng Mater

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Room‐Temperature Mechanical Properties of V₂₀Nb₂₀Mo₂₀Ta₂₀W₂₀ High‐Entropy Alloy

Wang

et al. 2018

Adv Eng Mater

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Refractory high‐entropy alloys (HEAs) have shown promising high temperature strengths, while their mechanical behaviors at room temperature are rarely reported. In this work, the room‐temperature mechanical properties of V20Nb20Mo20Ta20W20 refractory HEA under various different loading modes including tension, compression, bending, shear loading, and microhardness are investigated. The results show that this alloy exhibits very high compressive strength but quite low strengths under tension, bending, and shear loading, similar to the conventional brittle materials. However, pronounced plasticity and slip bands are observed in compression samples, and no indentation cracking is observed in low‐load microhardness tests, which indicate the potential ability of plastic deformation in this refractory HEA. The present work suggests that the microstructure or composition of this HEA should be carefully tailored before its practical usage to suppress its large tendency for cracking and eventually improve its ductility and strength under tension.

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Strain‐Rate Sensitive Deformation Behavior under Tension and Compression of Al_0.3CrFeCoNiMo_0.2

et al. 2021

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Herein, the strain‐rate sensitive deformation behavior of a sintered Al‐ and Mo‐modified CrFeCoNi high‐entropy alloy (HEA) is focused. The sintered microstructure is investigated using scanning electron microscopy (SEM), electron backscatter diffraction (EBSD), energy‐dispersive X‐ray spectroscopy (EDS), and X‐ray diffraction. It was found that after sintering, the microstructure is of very low porosity (<1%) and consists of an ultrafine Mo‐ and Cr‐rich σ phase embedded in a fine‐grained face‐centered cubic (FCC) matrix. Electron microscopy reveals another secondary phase in which Al and Ni are concentrated. For a detailed discussion of the deformation behavior under tension and compression, tensile and compression tests were conducted at strain rates of 10−3, 10, and 102 s−1. Strain‐rate sensitive deformation behavior in terms of strength is observed. The strain hardening rates show no significant strain rate sensitivity (SRS) up to strain rates of 10 s−1. However, at higher strain rates and under compressive loading, a distinctly increased strain hardening rate is found. Tension/compression asymmetry is determined since the SRS value m is twice as high under compression than under tension.

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Tension/compression asymmetry in additive manufactured face centered cubic high entropy alloy

Cited by 119 publications

References 28 publications

Additive Manufacturing of Advanced Multi‐Component Alloys: Bulk Metallic Glasses and High Entropy Alloys

Additive Manufacturing of Advanced Multi‐Component Alloys: Bulk Metallic Glasses and High Entropy Alloys

Room‐Temperature Mechanical Properties of V₂₀Nb₂₀Mo₂₀Ta₂₀W₂₀ High‐Entropy Alloy

Strain‐Rate Sensitive Deformation Behavior under Tension and Compression of Al_0.3CrFeCoNiMo_0.2

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Tension/compression asymmetry in additive manufactured face centered cubic high entropy alloy

Cited by 119 publications

References 28 publications

Additive Manufacturing of Advanced Multi‐Component Alloys: Bulk Metallic Glasses and High Entropy Alloys

Additive Manufacturing of Advanced Multi‐Component Alloys: Bulk Metallic Glasses and High Entropy Alloys

Room‐Temperature Mechanical Properties of V20Nb20Mo20Ta20W20 High‐Entropy Alloy

Strain‐Rate Sensitive Deformation Behavior under Tension and Compression of Al0.3CrFeCoNiMo0.2

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Product

Resources

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Room‐Temperature Mechanical Properties of V₂₀Nb₂₀Mo₂₀Ta₂₀W₂₀ High‐Entropy Alloy

Strain‐Rate Sensitive Deformation Behavior under Tension and Compression of Al_0.3CrFeCoNiMo_0.2