Reactive introduction of oxide nanoparticles in additively manufactured 718 Ni alloys with improved high temperature performance

Stegman, Benjamin; Yang, Bo; Shang, Zhongxia; Ding, Jie; Lopez, Jack; Jarosinski, William; Wang, Haiyan; Zhang, Xinghang

doi:10.1016/j.jallcom.2022.165846

Cited by 11 publications

(6 citation statements)

References 89 publications

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“…The fact that the large oxide agglomerates contain Ta, Ti, and Zr and the nanoscale oxides contain primarily Zr suggests that the respective free energies and diffusion distances achievable during LPBF impact the formation mechanism. We have recently reported on a similar Cr 2 O 3 oxide transformation phenomenon in LPBF Inconel 718 Ni alloy in which the Cr 2 O 3 undergoes a reduction–oxidation reaction during laser exposure, resulting in the formation of a higher stability of Al 2 O 3 and TiO 2 nanoparticles, and these reactions were shown to be exothermic for either pure oxide [ 49 ]. Other works utilizing Y 2 O 3 as the initial oxide in in situ ODS manufacturing have reported the formation of a Y–Al–O oxide, even though the Gibbs free energy of formation at 1480 K for Y 2 O 3 is lower (−988.5 KJ/mol) than for Al 2 O 3 (−802.2 KJ/mol), suggesting that the mixed oxide form has an even lower Gibbs free energy of formation than either pure compound [ 14 , 48 ].…”

Section: Discussionmentioning

confidence: 99%

In Situ Reactive Formation of Mixed Oxides in Additively Manufactured Cobalt Alloy

Lopez,

Cerne,

et al. 2023

Materials

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Oxide-dispersion-strengthened (ODS) alloys have long been considered for high temperature turbine, spacecraft, and nuclear reactor components due to their high temperature strength and radiation resistance. Conventional synthesis approaches of ODS alloys involve ball milling of powders and consolidation. In this work, a process-synergistic approach is used to introduce oxide particles during laser powder bed fusion (LPBF). Chromium (III) oxide (Cr2O3) powders are blended with a cobalt-based alloy, Mar-M 509, and exposed to laser irradiation, resulting in reduction–oxidation reactions involving metal (Ta, Ti, Zr) ions from the metal matrix to form mixed oxides of increased thermodynamic stability. A microstructure analysis indicates the formation of nanoscale spherical mixed oxide particles as well as large agglomerates with internal cracks. Chemical analyses confirm the presence of Ta, Ti, and Zr in agglomerated oxides, but primarily Zr in the nanoscale oxides. Mechanical testing reveals that agglomerate particle cracking is detrimental to tensile ductility compared to the base alloy, suggesting the need for improved processing methods to break up oxide particle clusters and promote their uniform dispersion during laser exposure.

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Section: Discussionmentioning

confidence: 99%

In Situ Reactive Formation of Mixed Oxides in Additively Manufactured Cobalt Alloy

Lopez,

Cerne,

et al. 2023

Materials

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“…It is due to the high melting point of YSZ (approx. 2700 °C) (4). In this study, we strive to revisit an optimal sintering approach of LSM:YSZ composite, because the prediction of the sintering process of multiphase materials is considered difficult (5).…”

Section: Introductionmentioning

confidence: 99%

The Impact of Sintering Conditions on the Inner Microstructure of Composites: LSM:YSZ Electrode Case Study

Carda¹,

Budac²,

Paidar³

et al. 2023

ECS Trans.

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The sintering of composite materials can pose a significant challenge if the composite constituents display substantially different melting points and if an intricate inner microstructure is required to be formed by the process. One of such materials represents a LSM:YSZ composite, utilized as an oxygen electrode in the solid oxide cells, where a compromise between particle interconnection and mass transport is essential. Thus, a well-understood development of microstructure during the sintering process is crucial to address these contradictory requirements. LSM:YSZ samples in a form of self-supporting bars and thin layers deposited onto YSZ support were investigated to demonstrate the impact of sintering temperature and the mixture composition on the resulting inner microstructure. Results obtained by means of SEM analysis allow to understand the connection between properties of powder materials precursors and the microstructure of densified bodies with respect to the sintering parameters.

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“…However, limited progress was made in obtaining a balanced room-temperature fracture toughness (K IC ) and high-temperature strength, which hinders its wider engineering applications. Additively manufactured oxide-dispersion-strengthened (ODS) alloy is a fast growing area of interest, and certain success has been achieved on material systems such as Ni- [3,4], Fe- [5], Ti- [6], Al-based alloys [7]. Addition of nanoparticles can affect powder sintering behaviour [8,9], reduce cracking susceptibility [4] and contribute to grain refinement [3].…”

Section: Introductionmentioning

confidence: 99%

“…Additively manufactured oxide-dispersion-strengthened (ODS) alloy is a fast growing area of interest, and certain success has been achieved on material systems such as Ni- [3,4], Fe- [5], Ti- [6], Al-based alloys [7]. Addition of nanoparticles can affect powder sintering behaviour [8,9], reduce cracking susceptibility [4] and contribute to grain refinement [3].…”

Section: Introductionmentioning

confidence: 99%

“…Y 2 O 3 is chosen for present PBF-EB TiAl nanocomposite because: (i) its good stability in TiAl melt, owing to its lowest standard free energy for Y 2 O 3 formation among other compounds (e.g. Al 2 O 3 , ZrO 2 , MgO 2 , SiO 2 ) [12]; (ii) its similar lattice parameter and coefficient of thermal expansion to TiAl, potentially leading to a strong interface bonding; and (iii) its density of 5 g/cm 3 is similar to TiAl of 4 g/cm 3 , which helps to avoids of slag floating on the melt pool top, potentially causing the interlayer defects [13].…”

Section: Introductionmentioning

confidence: 99%

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Electron Beam Powder Bed Fusion of Y2o3/Γ-Tial Nanocomposite with Balanced Strength and Toughness

Gao¹,

Hui²,

Yue

et al. 2023

Preprint

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Reactive introduction of oxide nanoparticles in additively manufactured 718 Ni alloys with improved high temperature performance

Cited by 11 publications

References 89 publications

In Situ Reactive Formation of Mixed Oxides in Additively Manufactured Cobalt Alloy

In Situ Reactive Formation of Mixed Oxides in Additively Manufactured Cobalt Alloy

The Impact of Sintering Conditions on the Inner Microstructure of Composites: LSM:YSZ Electrode Case Study

Electron Beam Powder Bed Fusion of Y2o3/Γ-Tial Nanocomposite with Balanced Strength and Toughness

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