Application Prospects and Microstructural Features in Laser-Induced Rapidly Solidified High-Entropy Alloys

Zhang, Hui; Ye, Pan; He, Yi; Wu, Jingfeng; Yue, Tai Man; Guo, Sheng

doi:10.1007/s11837-014-1036-6

Cited by 38 publications

(15 citation statements)

References 65 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The rapid cooling rates (10 4 –10 6 K/s) [ 98 ] induced by laser cladding and the temperature gradient between the bottom and the top of the melt pool lead to a typical microstructure of cladded coating consisting of columnar grains at the bounding zone and equiaxed grain at the cladding zone. This columnar-to-equiaxed transition of crystal growth found in laser cladding is controlled by the temperature gradient and the solidification rate in the same way discussed in Section 2 for Ti-6Al-4V (Figure 4 ).…”

Section: Microstructure and Mechanical Properties Of High-entropy Allmentioning

confidence: 99%

Additive manufacturing of metals: a brief review of the characteristic microstructures and properties of steels, Ti-6Al-4V and high-entropy alloys

Gorsse

Hutchinson

Gouné

et al. 2017

Science and Technology of Advanced Materials

735

330

View full text Add to dashboard Cite

We present a brief review of the microstructures and mechanical properties of selected metallic alloys processed by additive manufacturing (AM). Three different alloys, covering a large range of technology readiness levels, are selected to illustrate particular microstructural features developed by AM and clarify the engineering paradigm relating process–microstructure–property. With Ti-6Al-4V the emphasis is placed on the formation of metallurgical defects and microstructures induced by AM and their role on mechanical properties. The effects of the large in-built dislocation density, surface roughness and build atmosphere on mechanical and damage properties are discussed using steels. The impact of rapid solidification inherent to AM on phase selection is highlighted for high-entropy alloys. Using property maps, published mechanical properties of additive manufactured alloys are graphically summarized and compared to conventionally processed counterparts.

show abstract

Section: Microstructure and Mechanical Properties Of High-entropy Allmentioning

confidence: 99%

Additive manufacturing of metals: a brief review of the characteristic microstructures and properties of steels, Ti-6Al-4V and high-entropy alloys

Gorsse

Hutchinson

Gouné

et al. 2017

Science and Technology of Advanced Materials

735

330

View full text Add to dashboard Cite

show abstract

“…The high cooling rates of the melt (10 3 -10 6 K/s), typical for this method, help to reduce components segregation and prevent the formation and growth of brittle intermetallic compounds [5,6]. The structure of HEAs obtained by this method is usually represented by columnar and equiaxed grains [7]. It should be mentioned that the question of the influence of kinetic factors on the structural formation processes of high-entropy coatings (particularly in laser alloying process) is not fully covered, as the number of publications in this field is small.…”

Section: Introductionmentioning

confidence: 99%

Structure of High-Entropy AlCoCrFeNi Alloy Obtained by Laser Alloying

Gіrzhon¹,

Yemelianchenko²,

Smolyakov³

2021

Metallofiz. Noveishie Tekhnol.

View full text Add to dashboard Cite

The structural-phase state of the AlCoCrFeNi high-entropy alloy obtained by laser alloying of technically pure aluminium surface layers with a mixture of powders of pure elements Fe, Co, Ni, Cr in an equiatomic ratio is investigated by X-ray phase, X-ray spectral, and metallographic analyses. As shown, in the process of laser alloying the formation of a heterophase structure, which consists of an ordered multicomponent substitution solid solution based on b.c.c. lattice and Al 13 (Me) 4 monoclinic intermetallide, take place. As established, the formation of such a structure is a consequence of melt high cooling rates, high aluminium content and inhomogeneous distribution of chemical components in the surface and bottom layers of the laser alloying zone. The microhardness of the alloyed surface is 4.7 GPa, which is typical for high-entropy alloys of this system obtained by other methods. Additional reasons that may affect the high values of microhardness are analysed.

show abstract

“…A very first review of HEA coatings fabricated mainly by laser cladding and their application prospects was published by Zhang et al 29 The goal of our experimental work is a comparative study of the microstructure and hardness among HEAs prepared by conventional arc melting with a laser-beam-assisted surface coating technique. Laser beam remelting of Al x CoCrFeNi HEAs should demonstrate the strong influence of the (re)solidification rate on the microstructure and properties of HEAs, i.e., different for conventional casting and laser surface treatments.…”

Section: Introductionmentioning

confidence: 99%

Additive Manufacturing of High-Entropy Alloys by Laser Processing

Ocelík

Janssen

Smith

et al. 2016

JOM

129

View full text Add to dashboard Cite

This contribution concentrates on the possibilities of additive manufacturing of high-entropy clad layers by laser processing. In particular, the effects of the laser surface processing parameters on the microstructure and hardness of high-entropy alloys (HEAs) were examined. AlCoCrFeNi alloys with different amounts of aluminum prepared by arc melting were investigated and compared with the laser beam remelted HEAs with the same composition. Attempts to form HEAs coatings with a direct laser deposition from the mixture of elemental powders were made for AlCoCrFeNi and AlCrFeNiTa composition. A strong influence of solidification rate on the amounts of face-centered cubic and bodycentered cubic phase, their chemical composition, and spatial distribution was detected for two-phase AlCoCrFeNi HEAs. It is concluded that a high-power laser is a versatile tool to synthesize interesting HEAs with additive manufacturing processing. Critical issues are related to the rate of (re)solidification, the dilution with the substrate, powder efficiency during cladding, and differences in melting points of clad powders making additive manufacturing processing from a simple mixture of elemental powders a challenging approach.

show abstract

Application Prospects and Microstructural Features in Laser-Induced Rapidly Solidified High-Entropy Alloys

Cited by 38 publications

References 65 publications

Additive manufacturing of metals: a brief review of the characteristic microstructures and properties of steels, Ti-6Al-4V and high-entropy alloys

Additive manufacturing of metals: a brief review of the characteristic microstructures and properties of steels, Ti-6Al-4V and high-entropy alloys

Structure of High-Entropy AlCoCrFeNi Alloy Obtained by Laser Alloying

Additive Manufacturing of High-Entropy Alloys by Laser Processing

Contact Info

Product

Resources

About