Harnessing additive manufacturing-induced microstructure and solute heterogeneities for the design of precipitation-strengthened alloys
Source abstract
Abstract
Solute enrichment at lattice defects is a well-established phenomenon for promoting phase transformations. Metal additive manufacturing (AM) inherently enables this by promoting cellular structures during solidification and thermal cycling. Cellular structures exhibit compositional and lattice defect density variations between cell cores and boundaries, leading to site-specific phase-transformation (e.g., precipitation) behavior that can be selectively activated by post-AM heat treatments. Despite this potential, cellular structures have largely been treated as byproducts rather than intentionally exploited alloy design features. Guided by these insights, we designed a model Al 10.5 Co 25 Fe 39.5 Ni 25 multi-principal element alloy to intentionally control composition and thus, precipitation driving forces across cellular structures. The alloy composition was computationally selected to promote segregation of a fast-diffusing, precipitate-forming element into the interdendritic regions during solidification in the laser powder bed fusion (PBF-LB/M) process. This segregation aligned with dislocation walls at cell boundaries, creating a “pre-conditioned” state with enhanced chemical driving force and reduced nucleation barrier for precipitation. This targeted design enabled site-specific nucleation and growth of precipitates at cell boundaries during aging. Comprehensive multiscale characterization complemented by in situ synchrotron X-ray diffraction confirmed that cellular structures accelerated precipitation, increased precipitate volume fraction and refined the precipitate size compared to the reference state where cellular structures were removed via solution annealing before aging. As a result, the alloy achieved enhanced yield strength (122.2 % increase), and improved tensile properties compared to the reference state. These findings demonstrate the potential of harnessing cellular structures as functional components to control microstructure evolution in precipitation strengthened AM alloys.
Source: openalex_inverted_index · Quality: baseline
Research context
OpenAlex topics: Additive Manufacturing Materials and Processes · High Entropy Alloys Studies · Additive Manufacturing and 3D Printing Technologies
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (100+)
Show source-provided references
1. Segregation-dislocation self-organized structures ductilize a work-hardened medium entropy alloy10.1038/s41467-025-56710-3 ↗
2. Additive manufacturing of alloys with programmable microstructure and properties10.1038/s41467-023-42326-y ↗
3. High-Speed 3D Printing Coupled with Machine Learning to Accelerate Alloy Development for Additive Manufacturing10.1002/advs.202414880 ↗
4. Parametric analysis of thermal behavior during selective laser melting additive manufacturing of aluminum alloy powder10.1016/j.matdes.2014.07.006 ↗
5. Computational Assessment of Thermokinetics and Associated Microstructural Evolution in Laser Powder Bed Fusion Manufacturing of Ti6Al4V Alloy10.1038/s41598-020-63281-4 ↗
6. Laser powder-bed fusion additive manufacturing: Physics of complex melt flow and formation mechanisms of pores, spatter, and denudation zones10.1016/j.actamat.2016.02.014 ↗
7. Additive manufacturing of metallic components – Process, structure and properties10.1016/j.pmatsci.2017.10.001 ↗
8. The metallurgy and processing science of metal additive manufacturing10.1080/09506608.2015.1116649 ↗
9. Additively manufactured hierarchical stainless steels with high strength and ductility10.1038/nmat5021 ↗
10. Microstructural Control of Additively Manufactured Metallic Materials10.1146/annurev-matsci-070115-031816 ↗
11. Additive manufacturing of metals10.1016/j.actamat.2016.07.019 ↗
12. Metal Additive Manufacturing: A Review10.1007/s11665-014-0958-z ↗
13. About metastable cellular structure in additively manufactured austenitic stainless steels
14. Origin of dislocation structures in an additively manufactured austenitic stainless steel 316L10.1016/j.actamat.2020.07.063 ↗
15. The origin of high-density dislocations in additively manufactured metals10.1080/21663831.2020.1751739 ↗
16. Segregation-guided alloy design via tailored solidification behavior
17. Hetero-deformation-induced stress in additively manufactured 316L stainless steel10.1080/21663831.2020.1775149 ↗
18. Hierarchical microstructure and strengthening mechanisms of a CoCrFeNiMn high entropy alloy additively manufactured by selective laser melting10.1016/j.scriptamat.2018.05.015 ↗
19. Selective laser melted equiatomic CoCrFeMnNi high-entropy alloy: Microstructure, anisotropic mechanical response, and multiple strengthening mechanism10.1016/j.jallcom.2019.07.106 ↗
20. Cell boundary engineering of ferrous medium-entropy alloy fabricated by laser powder bed fusion10.1016/j.scriptamat.2023.115715 ↗
21. The significance of spatial length scales and solute segregation in strengthening rapid solidification microstructures of 316L stainless steel10.1016/j.actamat.2019.10.044 ↗
22. Strengthening mechanisms in directed energy deposited austenitic stainless steel10.1016/j.actamat.2018.11.021 ↗
23. Microstructural change in austenitic Fe-30.0wt%Mn-7.8wt%Al-1.3wt%C initiated by spinodal decomposition and its influence on mechanical properties10.1016/S1359-6454(97)00201-2 ↗
24. Understanding the process-microstructure correlations for tailoring the mechanical properties of L-PBF produced austenitic advanced high strength steel
25. Toward a better understanding of phase transformations in additive manufacturing of Alloy 718
26. Effect of heat treatment on the microstructural evolution of a nickel-based superalloy additive-manufactured by laser powder bed fusion10.1016/j.actamat.2018.03.017 ↗
27. On the role of cellular microstructure in austenite reversion in selective laser melted maraging steel10.1016/j.jmst.2023.10.032 ↗
28. A comparative analysis of Inconel 718 made by additive manufacturing and suction casting: Microstructure evolution in homogenization
29. Effect of heat treatment on microstructural heterogeneity and mechanical properties of 1%C-CoCrFeMnNi alloy fabricated by selective laser melting
30. The influence of microstructural heterogeneities on high-temperature mechanical properties of additively manufactured γ'-forming Ni-based alloys
31. Effect of micro-segregation of alloying elements on the precipitation behaviour in laser surface engineered Alloy 71810.1016/j.actamat.2021.116844 ↗
32. Tailoring the nanostructure of laser powder bed fusion additively manufactured maraging steel
33. Effect of heat treatment on microstructure evolution of Inconel 718 alloy fabricated by selective laser melting10.1016/j.jallcom.2018.06.112 ↗
34. Additively manufactured heterogeneous precipitation-strengthened high-entropy alloys with high strength and ductility
35. A recrystallization heat-treatment to reduce deformation anisotropy of additively manufactured Inconel 71810.1016/j.matdes.2020.109228 ↗
36. Static recrystallization impact on grain structure and mechanical properties of heat-treated Hastelloy X produced via laser powder-bed fusion10.1016/j.matchar.2021.110969 ↗
37. Recrystallization-based grain boundary engineering of 316L stainless steel produced via selective laser melting10.1016/j.actamat.2020.09.015 ↗
38. A precipitation-strengthened high-entropy alloy prepared by selective laser melting in-situ alloying and post-heat treatment10.1016/j.jallcom.2022.168145 ↗
39. Effects of annealing on the structure and mechanical properties of FeCoCrNi high-entropy alloy fabricated via selective laser melting
40. Evolution of microstructural heterogeneities in additively manufactured low-alloy steel
41. Dissolution of the Laves phase and δ-precipitate formation mechanism in additively manufactured Inconel 718 during post printing heat treatments
42. A high-entropy alloy with dislocation-precipitate skeleton for ultrastrength and ductility10.1016/j.actamat.2022.117975 ↗
43. Multiple precipitation pathways in an Al-7Si-0.6Mg alloy fabricated by selective laser melting10.1016/j.scriptamat.2018.09.045 ↗
44. Multi-length-scale study on the heat treatment response to supersaturated nickel-based superalloys: Precipitation reactions and incipient recrystallisation
45. Interpass rolling of Ti-6Al-4V wire + arc additively manufactured features for microstructural refinement
46. 1 billion tons of nanostructure – segregation engineering enables confined transformation effects at lattice defects in steels10.1088/1757-899X/219/1/012006 ↗
47. Segregation engineering enables nanoscale martensite to austenite phase transformation at grain boundaries: A pathway to ductile martensite10.1016/j.actamat.2013.06.055 ↗
48. Controlling microstructure and mechanical properties of additively manufactured high-strength steels by tailored solidification
49. Optimal Design for Metal Additive Manufacturing: An Integrated Computational Materials Engineering (ICME) Approach10.1007/s11837-020-04028-4 ↗
50. A strong fracture-resistant high-entropy alloy with nano-bridged honeycomb microstructure intrinsically toughened by 3D-printing10.1038/s41467-024-45178-2 ↗
51. Strong yet ductile nanolamellar high-entropy alloys by additive manufacturing10.1038/s41586-022-04914-8 ↗
52. Inhibiting cracking and improving strength for additive manufactured Al CoCrFeNi high entropy alloy via changing crystal structure from BCC-to-FCC
53. Reducing hot tearing by grain boundary segregation engineering in additive manufacturing: example of an AlxCoCrFeNi high-entropy alloy10.1016/j.actamat.2020.116505 ↗
54. Enhancing fatigue life by ductile-transformable multicomponent B2 precipitates in a high-entropy alloy10.1038/s41467-021-23689-6 ↗
55. Additive manufacturing of metals: Microstructure evolution and multistage control10.1016/j.jmst.2021.06.011 ↗
56. Thermo-Calc & DICTRA, computational tools for materials science10.1016/S0364-5916(02)00037-8 ↗
57. Thermodynamic database for multi-principal element alloys within the system Al–Co–Cr–Fe–Mn–Ni–C10.1016/j.calphad.2023.102644 ↗
58. NIH Image to ImageJ: 25 years of image analysis10.1038/nmeth.2089 ↗
59. Orientations – perfectly colored10.1107/S1600576716012942 ↗
60. Grain detection from 2d and 3d EBSD data–specification of the MTEX algorithm10.1016/j.ultramic.2011.08.002 ↗
61. Texture Analysis with MTEX – Free and Open Source Software Toolbox10.4028/www.scientific.net/SSP.160.63 ↗
62. Misorientation-dependent solute enrichment at interfaces and its contribution to defect formation mechanisms during laser additive manufacturing of superalloys10.1103/PhysRevMaterials.3.123602 ↗
63. In situ site-specific specimen preparation for atom probe tomography10.1016/j.ultramic.2006.06.008 ↗
64. GSAS-II the genesis of a modern open-source all purpose crystallography software package10.1107/S0021889813003531 ↗
65. The role of annealing twins during recrystallization of Cu10.1016/j.actamat.2007.03.021 ↗
66. The role of side-branching in microstructure development in laser powder-bed fusion10.1038/s41467-020-14453-3 ↗
67. The Materials Project. Materials Data on AlNi by Materials Project 2020. https://doi.org/10.17188/1190944.
68. The Materials Project. Materials Data on FeCo by Materials Project 2020. https://doi.org/10.17188/1196095.
69. The Influence of Annealing Temperature and Time on the Formation of δ-Phase in Additively-Manufactured Inconel 62510.1007/s11661-018-4643-y ↗
70. Observation of Giant Diffusivity Along Dislocation Cores
71. Mehrer · 1990
72. Influence of alloy composition and heat treatment on precipitate composition in Al–Zn–Mg–Cu alloys10.1016/j.actamat.2009.09.003 ↗
73. Recrystallization of Single-Phase Alloys
74. Porter · 2009
75. Gottstein · 2004
76. Insight into the kinetic stabilization of Al0.3CoCrFeNi high-entropy alloys
77. Interdiffusion in the FCC-structured Al-Co-Cr-Fe-Ni high entropy alloys: Experimental studies and numerical simulations10.1016/j.jallcom.2016.03.046 ↗
78. The influence of Cu/Li ratio on precipitation in Al–Cu–Li–x alloys10.1016/j.actamat.2012.12.041 ↗
79. On the strengthening response of aluminum alloys containing shear-resistant plate-shaped precipitates10.1016/j.actamat.2008.08.023 ↗
80. Precipitation kinetics in metallic alloys: Experiments and modeling10.1016/j.actamat.2021.117338 ↗
81. Predicting Precipitation Kinetics During the Annealing of Additive Manufactured Inconel 625 Components10.1007/s40192-019-00134-7 ↗
82. Precipitation phenomena in ultrafine grained Al–Mg–Si alloy with heterogeneous microstructure10.1016/j.actamat.2015.10.030 ↗
83. Direct measurement of the effect of cold rolling on β phase precipitation kinetics in 5xxx series aluminum alloys10.1016/j.actamat.2016.10.060 ↗
84. Ordering-mediated local nano-clustering results in unusually large Hall-Petch strengthening coefficients in high entropy alloys10.1080/21663831.2020.1871440 ↗
85. Substitutional solution hardening10.1016/0001-6160(63)90213-X ↗
86. A precipitation-hardened high-entropy alloy with outstanding tensile properties10.1016/j.actamat.2015.08.076 ↗
87. Effects of Al addition on structural evolution and tensile properties of the FeCoNiCrMn high-entropy alloy system10.1016/j.actamat.2013.09.037 ↗
88. Temperature dependence of the mechanical properties of equiatomic solid solution alloys with face-centered cubic crystal structures10.1016/j.actamat.2014.08.026 ↗
89. Effect of elemental combination on friction stress and Hall-Petch relationship in face-centered cubic high /medium entropy alloys10.1016/j.actamat.2019.04.017 ↗
90. Thermal activation mechanisms and Labusch-type strengthening analysis for a family of high-entropy and equiatomic solid-solution alloys10.1016/j.actamat.2016.08.047 ↗
91. Anisotropic polycrystal plasticity due to microstructural heterogeneity: A multi-scale experimental and numerical study on additively manufactured metallic materials10.1016/j.actamat.2019.12.003 ↗
92. Novel NiAl-strengthened high entropy alloys with balanced tensile strength and ductility10.1016/j.msea.2018.11.055 ↗
93. First-principles and machine learning predictions of elasticity in severely lattice-distorted high-entropy alloys with experimental validation10.1016/j.actamat.2019.09.026 ↗
94. Additive manufacturing of a functionally graded high entropy alloy using a hybrid powder-bed wire-based direct energy deposition approach
95. Knowledge of process-structure-property relationships to engineer better heat treatments for laser powder bed fusion additive manufactured Inconel 718
96. Physics and phenomenology of strain hardening: the FCC case10.1016/S0079-6425(02)00003-8 ↗
97. The α-factor in the Taylor flow-stress law in monotonic, cyclic and quasi-stationary deformations: Dependence on slip mode, dislocation arrangement and density10.1016/j.cossms.2016.07.001 ↗
98. The dislocation cell size and dislocation density in copper deformed at temperatures between 25 and 700°C10.1016/0001-6160(72)90012-0 ↗
99. Dislocation densities in some annealed and cold-worked metals from measurements on the X-ray debye-scherrer spectrum10.1080/14786435608238074 ↗
100. X-ray line broadening from filed aluminium and wolfram10.1016/0001-6160(53)90006-6 ↗