Process optimization of high entropy alloys by laser additive manufacturing

Dada, Modupeola; Popoola, A. P. I.; Mathe, Ntombi; Pityana, Sisa; Adeosun, S. O.; Aramide, Fatai Olufemi; Lengopeng, Thabo

doi:10.1002/eng2.12252

Cited by 17 publications

(10 citation statements)

References 101 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In the majority of cases, multicomponent alloys are synthesized by crystallization from the melt (arc or induction melting in vacuum or argon [5][6][7][13][14][15][16][17][18][28][29][30][31][32][33][34][35][36][37][38][39][40][41][42][43], plasma spark sintering [19], electric current assisted sintering [20,21], laser or plasma cladding deposition of coatings [44][45][46][47][48][49][50][51][52][53][54][55], additive manufacturing by the laser-powder bed fusion [56,57] or laser-metal deposition [58], self-propagating high-temperature synthesis (SHS) [59], and by brazing within the brazing joints [60,61]). Figure 1 shows a schematic phase diagram for the simplest case when there are on...…”

Section: Grain Boundary Wetting By the Liquid Phasementioning

confidence: 99%

The Grain Boundary Wetting Phenomena in the Ti-Containing High-Entropy Alloys: A Review

Straumal

Korneva

Kuzmin

et al. 2021

Metals

View full text Add to dashboard Cite

In this review, the phenomenon of grain boundary (GB) wetting by melt is analyzed for multicomponent alloys without principal components (also called high-entropy alloys or HEAs) containing titanium. GB wetting can be complete or partial. In the former case, the liquid phase forms the continuous layers between solid grains and completely separates them. In the latter case of partial GB wetting, the melt forms the chain of droplets in GBs, with certain non-zero contact angles. The GB wetting phenomenon can be observed in HEAs produced by all solidification-based technologies. GB leads to the appearance of novel GB tie lines Twmin and Twmax in the multicomponent HEA phase diagrams. The so-called grain-boundary engineering of HEAs permits the use of GB wetting to improve the HEAs’ properties or, alternatively, its exclusion if the GB layers of a second phase are detrimental.

show abstract

Section: Grain Boundary Wetting By the Liquid Phasementioning

confidence: 99%

The Grain Boundary Wetting Phenomena in the Ti-Containing High-Entropy Alloys: A Review

Straumal

Korneva

Kuzmin

et al. 2021

Metals

View full text Add to dashboard Cite

show abstract

“…For example, Henrik et al [113] fabricated TiZrNbTa MPEAs by DED and found that the proper feeding speed of nozzle (100 mm/min) can lead to high quality MPEAs samples. Moreover, Modupeola et al [114] investigated the influence of processing parameters on the microstructure of DED fabricated AlTiCrFeCoNi and AlCoCrFeNiCu MPEAs. They indicate that using a laser power of 1200-1600 W and a scanning speed of 8-12 mm/s can result in reduced processing defects than other parameters.…”

Section: Key Microstructure Features and Characteristics In Am Mpeas ...mentioning

confidence: 99%

“…AM processing parameters impact not only the processing defects but also the solidification microstructure [114,123]. Tong et al [124] uncovered the influence of DED processing parameters on the solidification of CoCrNiFeMn MPEAs.…”

Section: Solidification Microstructure Of Am Mpeasmentioning

confidence: 99%

“…9d, e). Heat flux was demonstrated to play a key role in determining the growth direction of both grains and internal cells in a single melt pool [84,92,114]. It is known that by changing the scanning direction a different heat flux with different directions can be obtained in the melt pool of the fabricated part.…”

Section: Solidification Microstructure Of Am Mpeasmentioning

confidence: 99%

See 1 more Smart Citation

Review: Multi-principal element alloys by additive manufacturing

Ferry

Kruzic

et al. 2022

J Mater Sci

View full text Add to dashboard Cite

Multi-principal element alloys (MPEAs) have attracted rapidly growing attention from both research institutions and industry due to their unique microstructures and outstanding physical and chemical properties. However, the fabrication of MPEAs with desired microstructures and properties using conventional manufacturing techniques (e.g., casting) is still challenging. With the recent emergence of additive manufacturing (AM) techniques, the fabrication of MPEAs with locally tailorable microstructures and excellent mechanical properties has become possible. Therefore, it is of paramount importance to understand the key aspects of the AM processes that influence the microstructural features of AM fabricated MPEAs including porosity, anisotropy, and heterogeneity, as well as the corresponding impact on the properties. As such, this review will first present the state-of-the-art in existing AM techniques to process MPEAs. This is followed by a discussion of the microstructural features, mechanisms of microstructural evolution, and the mechanical properties of the AM fabricated MPEAs. Finally, the current challenges and future research directions are summarized with the aim to promote the further development and implementation of AM for processing MPEAs for future industrial applications.

show abstract

“…Usually, HEAs synthesis is based on the crystallization from the melt by induction or arc melting [5][6][7][8][9][10][11][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32][33][34][35], plasma spark [36] or electric current assisted sintering [37,38], additive manufacturing by laser metal deposition [39], laser powder bed fusion [40,41] or laser or plasma cladding deposition of coatings [42][43][44][45][46][47][48][49][50][51][52][53], self-propagating high-temperature synthesis (SHS) [54], or brazing of dissimilar materials [55,56]. However, several HEA manufacturing technologies are based exclusively on the processes occurring in the solid state, such as solid-phase sintering [57]...…”

Section: Grain Boundary Wetting Phenomenamentioning

confidence: 99%

Grain Boundary Wetting Phenomena in High Entropy Alloys Containing Nitrides, Carbides, Borides, Silicides, and Hydrogen: A Review

et al. 2021

View full text Add to dashboard Cite

In this review, we analyze the structure of multicomponent alloys without principal components (they are also called high entropy alloys—HEAs), containing not only metals but also hydrogen, nitrogen, carbon, boron, or silicon. In particular, we discuss the phenomenon of grain boundary (GB) wetting by the melt or solid phase. The GB wetting can be complete or incomplete (partial). In the former case, the grains of the matrix are completely separated by the continuous layer of the second phase (solid or liquid). In the latter case of partial GB wetting, the second solid phase forms, between the matrix grains, a chain of (usually lenticular) precipitates or droplets with a non-zero value of the contact angle. To deal with the morphology of GBs, the new GB tie-lines are used, which can be constructed in the two- or multiphase areas of the multidimensional HEAs phase diagrams. The GBs in HEAs in the case of complete or partial wetting can also contain hydrides, nitrides, carbides, borides, or silicides. Thus, GB wetting by the hydrides, nitrides, carbides, borides, or silicides can be used in the so-called grain boundary chemical engineering in order to improve the properties of respective HEAs.

show abstract

Process optimization of high entropy alloys by laser additive manufacturing

Cited by 17 publications

References 101 publications

The Grain Boundary Wetting Phenomena in the Ti-Containing High-Entropy Alloys: A Review

The Grain Boundary Wetting Phenomena in the Ti-Containing High-Entropy Alloys: A Review

Review: Multi-principal element alloys by additive manufacturing

Grain Boundary Wetting Phenomena in High Entropy Alloys Containing Nitrides, Carbides, Borides, Silicides, and Hydrogen: A Review

Contact Info

Product

Resources

About