Pub Date : 2023-09-19DOI: 10.1080/21663831.2023.2258158
Sujung Son, Jungwan Lee, Peyman Asghari-Rad, Rae Eon Kim, Hyojin Park, Jae-il Jang, Wen Chen, Yoon-Uk Heo, Hyoung Seop Kim
A heterostructuring strategy is an effective approach for abiding problems referred to as the strength-ductility trade-off. However, tailoring the heterostructure is an arduous problem. This work synthesized hierarchically heterogeneity by combining the eutectic high-entropy alloy (EHEA) and medium-entropy alloy powders through novel powder metallurgy-based severe plastic deformation (P-SPD). EHEA forms nano-scaled heterogeneity composed of FCC and B2, and the mixture of powder types forms micro-scale heterogeneity with hard and soft domains. This hierarchically heterogeneous microstructure leads to strong hetero-deformation-induced strengthening, achieving a yield strength of ∼1.5 GPa. The present P-SPD represents the feasibility of heterostructuring, aiding the development of HEAs.
{"title":"Hierarchically heterogeneous microstructure and mechanical behavior of the multi-materials prepared by powder severe plastic deformation","authors":"Sujung Son, Jungwan Lee, Peyman Asghari-Rad, Rae Eon Kim, Hyojin Park, Jae-il Jang, Wen Chen, Yoon-Uk Heo, Hyoung Seop Kim","doi":"10.1080/21663831.2023.2258158","DOIUrl":"https://doi.org/10.1080/21663831.2023.2258158","url":null,"abstract":"A heterostructuring strategy is an effective approach for abiding problems referred to as the strength-ductility trade-off. However, tailoring the heterostructure is an arduous problem. This work synthesized hierarchically heterogeneity by combining the eutectic high-entropy alloy (EHEA) and medium-entropy alloy powders through novel powder metallurgy-based severe plastic deformation (P-SPD). EHEA forms nano-scaled heterogeneity composed of FCC and B2, and the mixture of powder types forms micro-scale heterogeneity with hard and soft domains. This hierarchically heterogeneous microstructure leads to strong hetero-deformation-induced strengthening, achieving a yield strength of ∼1.5 GPa. The present P-SPD represents the feasibility of heterostructuring, aiding the development of HEAs.","PeriodicalId":18291,"journal":{"name":"Materials Research Letters","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135059837","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-09-19DOI: 10.1080/21663831.2023.2256359
Liangxue Zhang, Qingsong Pan, Lei Lu
Gradient dislocation cell structured Al0.1CoCrFeNi high-entropy alloys exhibited exceptional strength and uniform ductility. HEA containing homogeneous dislocation cells, with the average size varying from 0.29 to 0.43 μm was observed to still exhibit a superior combination of high strength and good uniform elongation, distinct from traditional strong ultrafine-grained structures with limited ductility. This is because the initial dislocation cells tend to be progressively patterned into dense dislocation walls upon straining, associated with the massive dislocation motion and accumulation. The gradient-induced additional strain hardening behavior was clarified by directly comparing the mechanical behavior of the homogeneous and gradient samples.
{"title":"Revealing the mechanical behavior of homogeneous dislocation cell units in high-entropy alloy","authors":"Liangxue Zhang, Qingsong Pan, Lei Lu","doi":"10.1080/21663831.2023.2256359","DOIUrl":"https://doi.org/10.1080/21663831.2023.2256359","url":null,"abstract":"Gradient dislocation cell structured Al0.1CoCrFeNi high-entropy alloys exhibited exceptional strength and uniform ductility. HEA containing homogeneous dislocation cells, with the average size varying from 0.29 to 0.43 μm was observed to still exhibit a superior combination of high strength and good uniform elongation, distinct from traditional strong ultrafine-grained structures with limited ductility. This is because the initial dislocation cells tend to be progressively patterned into dense dislocation walls upon straining, associated with the massive dislocation motion and accumulation. The gradient-induced additional strain hardening behavior was clarified by directly comparing the mechanical behavior of the homogeneous and gradient samples.","PeriodicalId":18291,"journal":{"name":"Materials Research Letters","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135060500","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-09-13DOI: 10.1080/21663831.2023.2254910
Yunsong Zhao, Na Li, Li Wang, Junyang He, Weihong Liu, Min Song
By using state-of-the-art characterisation techniques including atom probe tomography and atomic resolved elemental mapping, we successfully probed the site occupation evolution associated with composition change in γ′, during 1100°C creep of a fourth generation Ru-bearing Ni-based superalloy. It is quantified that, W and Ru maintain unchanged site preference after creep rupture, while interestingly, the rest elements especially Co, Ta and Re show a weakened preference at both α- and β-sites in the γ′ lattice. This indicates the overall reduced γ′ ordering degree and thus the possible decrease in planar fault energies, which further facilitates dislocation shearing in γ′.
{"title":"High-temperature creep-induced site occupation evolution in the γ′ lattice in a Ru-bearing Ni-based superalloy","authors":"Yunsong Zhao, Na Li, Li Wang, Junyang He, Weihong Liu, Min Song","doi":"10.1080/21663831.2023.2254910","DOIUrl":"https://doi.org/10.1080/21663831.2023.2254910","url":null,"abstract":"By using state-of-the-art characterisation techniques including atom probe tomography and atomic resolved elemental mapping, we successfully probed the site occupation evolution associated with composition change in γ′, during 1100°C creep of a fourth generation Ru-bearing Ni-based superalloy. It is quantified that, W and Ru maintain unchanged site preference after creep rupture, while interestingly, the rest elements especially Co, Ta and Re show a weakened preference at both α- and β-sites in the γ′ lattice. This indicates the overall reduced γ′ ordering degree and thus the possible decrease in planar fault energies, which further facilitates dislocation shearing in γ′.","PeriodicalId":18291,"journal":{"name":"Materials Research Letters","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135740476","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-09-13DOI: 10.1080/21663831.2023.2255218
Wei Jiang, Yunlai Deng, Qingsong Dai, Xiaobin Guo
The mechanical anisotropy of selective laser melted (SLM) aluminum alloys resulting from heterogeneous grain structures is still not fully understood due to lacking study of grain orientation related mechanical response. Here, by introducing in-situ EBSD tensile method, the orientation induced anisotropy coefficient Ka related to the deformation-induced grain rotation was revealed by excluding effects of grain size and grain aspect ratio. Compared with traditional mechanical properties models by Taylor factor M, it was found that the orientation <001 > in as-built and <102 > in heat treatment contributed the most yield strength anisotropy, and introducing Ka predicts the mechanical anisotropy more accurately.
{"title":"In-situ EBSD investigation of orientation induced mechanical anisotropy in selective laser melted Al-Mn-Sc alloy","authors":"Wei Jiang, Yunlai Deng, Qingsong Dai, Xiaobin Guo","doi":"10.1080/21663831.2023.2255218","DOIUrl":"https://doi.org/10.1080/21663831.2023.2255218","url":null,"abstract":"The mechanical anisotropy of selective laser melted (SLM) aluminum alloys resulting from heterogeneous grain structures is still not fully understood due to lacking study of grain orientation related mechanical response. Here, by introducing in-situ EBSD tensile method, the orientation induced anisotropy coefficient Ka related to the deformation-induced grain rotation was revealed by excluding effects of grain size and grain aspect ratio. Compared with traditional mechanical properties models by Taylor factor M, it was found that the orientation <001 > in as-built and <102 > in heat treatment contributed the most yield strength anisotropy, and introducing Ka predicts the mechanical anisotropy more accurately.","PeriodicalId":18291,"journal":{"name":"Materials Research Letters","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135740342","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-09-11DOI: 10.1080/21663831.2023.2255321
Mo-Rigen He, Ruopeng Zhang, Rohan Dhall, Andrew M. Minor, Kevin J. Hemker
Microstructural evolution in nanotwinned Ni-Mo-W alloys under in situ heating experiments is investigated in a transmission electron microscope. Migration of twin boundaries and grain boundaries as well as formation of carbide precipitates are observed at various temperatures and characterized at atomic resolution. These transformations are found to occur at temperatures that are ∼200°C lower in Mo-rich (Ni85Mo13W2) specimens than in W-rich (Ni86Mo3W11) specimens, which highlights the different efficacy of Mo and W solutes in stabilizing the nanotwinned structure. Inspection of various mechanisms points to the importance of elastic modulus mismatch as a pathway for enhancing nanotwin stability by alloying. GRAPHICAL ABSTRACT IMPACT STATEMENT We present the first in situ and atomic-resolution study of the thermal stability of nanotwinned alloys. Comparison of Mo-rich and W-rich Ni-Mo-W alloys uncovers the nontrivial role of solute species.
{"title":"In situ TEM study of the thermal stability of nanotwinned Ni-Mo-W alloys","authors":"Mo-Rigen He, Ruopeng Zhang, Rohan Dhall, Andrew M. Minor, Kevin J. Hemker","doi":"10.1080/21663831.2023.2255321","DOIUrl":"https://doi.org/10.1080/21663831.2023.2255321","url":null,"abstract":"Microstructural evolution in nanotwinned Ni-Mo-W alloys under in situ heating experiments is investigated in a transmission electron microscope. Migration of twin boundaries and grain boundaries as well as formation of carbide precipitates are observed at various temperatures and characterized at atomic resolution. These transformations are found to occur at temperatures that are ∼200°C lower in Mo-rich (Ni85Mo13W2) specimens than in W-rich (Ni86Mo3W11) specimens, which highlights the different efficacy of Mo and W solutes in stabilizing the nanotwinned structure. Inspection of various mechanisms points to the importance of elastic modulus mismatch as a pathway for enhancing nanotwin stability by alloying. GRAPHICAL ABSTRACT IMPACT STATEMENT We present the first in situ and atomic-resolution study of the thermal stability of nanotwinned alloys. Comparison of Mo-rich and W-rich Ni-Mo-W alloys uncovers the nontrivial role of solute species.","PeriodicalId":18291,"journal":{"name":"Materials Research Letters","volume":"364 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135980665","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-09-06DOI: 10.1080/21663831.2023.2252885
Avanish Mishra, K. Dang, Edward M. Kober, S. Fensin, Nithin Mathew
This study investigated the high-strain rate deformation of bicrystal Cu nanopillars, using atomistic simulations. Nanopillars with minimum grain boundary energy were deformed to investigate the role of macroscopic degrees of freedom, finding that geometric parameters (Schmid factor) influence the stress–strain response. The deformation of metastable grain boundaries (GBs) revealed that in addition to geometric parameters, the response was also governed by the local atomic arrangement at the boundary, dictating the dislocation-GB interactions. These findings shed light on the response of nanopillars as a function of GBs and show the importance of both macroscopic and microscopic degrees of freedom on the mechanical response. GRAPHICAL ABSTRACT IMPACT STATEMENT Metastable states, an often ignored aspect of GB structure, is shown to have a strong influence on dislocation-GB interactions; shedding new light on mechanical response of realistic GBs.
{"title":"Role of microscopic degrees of freedom in mechanical response of bicrystal nanopillars","authors":"Avanish Mishra, K. Dang, Edward M. Kober, S. Fensin, Nithin Mathew","doi":"10.1080/21663831.2023.2252885","DOIUrl":"https://doi.org/10.1080/21663831.2023.2252885","url":null,"abstract":"This study investigated the high-strain rate deformation of bicrystal Cu nanopillars, using atomistic simulations. Nanopillars with minimum grain boundary energy were deformed to investigate the role of macroscopic degrees of freedom, finding that geometric parameters (Schmid factor) influence the stress–strain response. The deformation of metastable grain boundaries (GBs) revealed that in addition to geometric parameters, the response was also governed by the local atomic arrangement at the boundary, dictating the dislocation-GB interactions. These findings shed light on the response of nanopillars as a function of GBs and show the importance of both macroscopic and microscopic degrees of freedom on the mechanical response. GRAPHICAL ABSTRACT IMPACT STATEMENT Metastable states, an often ignored aspect of GB structure, is shown to have a strong influence on dislocation-GB interactions; shedding new light on mechanical response of realistic GBs.","PeriodicalId":18291,"journal":{"name":"Materials Research Letters","volume":"11 1","pages":"872 - 878"},"PeriodicalIF":8.3,"publicationDate":"2023-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42193441","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-09-05DOI: 10.1080/21663831.2023.2252858
Jiajing Chen, Yuanfei Han, Zichao Wei, Shaopeng Li, Zhonggang Sun, Liang Zhang, Guangfa Huang, Jianwen Le, Di Zhang, Weijie Lu
Constructing heterostructures in particulate reinforced titanium matrix composites (PRTMCs) to evade the strength-ductility trade-off dilemma is much more difficult than in metals. Here, we proposed a novel and controllable strategy of simple powder assembly to fabricate bimodal-grained PRTMCs, this customized strategy makes coarse grains (CGs) surrounded by ultrafine-grained (UFG) matrices, conferring a superior strength-ductility combination not achievable by their traditional homogeneous counterparts. We found that such heterostructures appear to promote storage of mostly dislocations in CGs and accumulation near the CG/UFG boundaries. Moreover, hybrid reinforcements also activate multiple hardening mechanisms, inducing high ductility. GRAPHICAL ABSTRACT IMPACT STATEMENT We proposed a novel and controllable strategy of simple powder assembly to fabricate heterostructured metal matrix composites for breaking the strength-ductility trade-off dilemma and revealed the enhanced dislocation activity.
{"title":"Heterostructured titanium composites with superior strength-ductility synergy via controllable bimodal grains and dislocation activity","authors":"Jiajing Chen, Yuanfei Han, Zichao Wei, Shaopeng Li, Zhonggang Sun, Liang Zhang, Guangfa Huang, Jianwen Le, Di Zhang, Weijie Lu","doi":"10.1080/21663831.2023.2252858","DOIUrl":"https://doi.org/10.1080/21663831.2023.2252858","url":null,"abstract":"Constructing heterostructures in particulate reinforced titanium matrix composites (PRTMCs) to evade the strength-ductility trade-off dilemma is much more difficult than in metals. Here, we proposed a novel and controllable strategy of simple powder assembly to fabricate bimodal-grained PRTMCs, this customized strategy makes coarse grains (CGs) surrounded by ultrafine-grained (UFG) matrices, conferring a superior strength-ductility combination not achievable by their traditional homogeneous counterparts. We found that such heterostructures appear to promote storage of mostly dislocations in CGs and accumulation near the CG/UFG boundaries. Moreover, hybrid reinforcements also activate multiple hardening mechanisms, inducing high ductility. GRAPHICAL ABSTRACT IMPACT STATEMENT We proposed a novel and controllable strategy of simple powder assembly to fabricate heterostructured metal matrix composites for breaking the strength-ductility trade-off dilemma and revealed the enhanced dislocation activity.","PeriodicalId":18291,"journal":{"name":"Materials Research Letters","volume":"11 1","pages":"863 - 871"},"PeriodicalIF":8.3,"publicationDate":"2023-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43115308","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-09-04DOI: 10.1080/21663831.2023.2253267
Sicong Lin, Kai Chen, Qiang Zeng, U. Ramamurty
Recrystallization, possibly triggered during heat treatments by plastic strains of only 1–2%, is highly deleterious to Ni-based single-crystal superalloys. Herein, we successfully recover plastic deformation and enhance the supersolvus critical strain for recrystallization by ramping the annealing temperature slowly from 1100 °C to γ′-solvus point. This preempts recrystallization during the subsequent supersolvus solutionizing treatment. The proposed method is validated in single-crystals compressed to 5.9% plastic strain at room temperature. After supersolvus solutionizing, an almost dislocation-free single-crystal with uniformly distributed γ′-precipitates is obtained. The proposed method offers a practical means to bring down the overall expenses of single-crystal turbine blades. GRAPHICAL ABSTRACT IMPACT STATEMENT An optimized pre-solutionizing recovery heat treatment can elevate the critical plastic strain value for recrystallization in Ni-based superalloy single-crystals to 3 times higher than previously established.
{"title":"A method for increasing the supersolvus critical strain for recrystallization in single-crystal superalloys","authors":"Sicong Lin, Kai Chen, Qiang Zeng, U. Ramamurty","doi":"10.1080/21663831.2023.2253267","DOIUrl":"https://doi.org/10.1080/21663831.2023.2253267","url":null,"abstract":"Recrystallization, possibly triggered during heat treatments by plastic strains of only 1–2%, is highly deleterious to Ni-based single-crystal superalloys. Herein, we successfully recover plastic deformation and enhance the supersolvus critical strain for recrystallization by ramping the annealing temperature slowly from 1100 °C to γ′-solvus point. This preempts recrystallization during the subsequent supersolvus solutionizing treatment. The proposed method is validated in single-crystals compressed to 5.9% plastic strain at room temperature. After supersolvus solutionizing, an almost dislocation-free single-crystal with uniformly distributed γ′-precipitates is obtained. The proposed method offers a practical means to bring down the overall expenses of single-crystal turbine blades. GRAPHICAL ABSTRACT IMPACT STATEMENT An optimized pre-solutionizing recovery heat treatment can elevate the critical plastic strain value for recrystallization in Ni-based superalloy single-crystals to 3 times higher than previously established.","PeriodicalId":18291,"journal":{"name":"Materials Research Letters","volume":"11 1","pages":"856 - 862"},"PeriodicalIF":8.3,"publicationDate":"2023-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43527850","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-09-01DOI: 10.1080/21663831.2023.2244969
Xuan Zhang, Christopher P. Carter, Yashas Satapathy, A. Tekawade, J. Park, P. Kenesei, Meimei Li
Additively manufactured (AM) 316L stainless steel (SS) has been reported to have low creep resistance compared to its conventionally made counterparts. Herein, we quantitatively characterized the voids in a creep-ruptured AM 316L SS specimen and those in a conventional specimen ruptured under the same testing condition. The AM 316L SS contained more small creep voids and fewer large ones. 3D reconstructions showed the spatial distribution of the small voids in AM 316L SS followed the melt pool tracks, which was attributed to the grain structure unique to the laser process. The observations explained the creep behaviors of the two specimens. GRAPHICAL ABSTRACT IMPACT STATEMENT This paper reports that the grain structure resulted from the laser printing process has critical effects on the creep void formation in AM 316L SS.
{"title":"Understanding creep behaviors of additively manufactured 316L stainless steel via void characterization","authors":"Xuan Zhang, Christopher P. Carter, Yashas Satapathy, A. Tekawade, J. Park, P. Kenesei, Meimei Li","doi":"10.1080/21663831.2023.2244969","DOIUrl":"https://doi.org/10.1080/21663831.2023.2244969","url":null,"abstract":"Additively manufactured (AM) 316L stainless steel (SS) has been reported to have low creep resistance compared to its conventionally made counterparts. Herein, we quantitatively characterized the voids in a creep-ruptured AM 316L SS specimen and those in a conventional specimen ruptured under the same testing condition. The AM 316L SS contained more small creep voids and fewer large ones. 3D reconstructions showed the spatial distribution of the small voids in AM 316L SS followed the melt pool tracks, which was attributed to the grain structure unique to the laser process. The observations explained the creep behaviors of the two specimens. GRAPHICAL ABSTRACT IMPACT STATEMENT This paper reports that the grain structure resulted from the laser printing process has critical effects on the creep void formation in AM 316L SS.","PeriodicalId":18291,"journal":{"name":"Materials Research Letters","volume":"11 1","pages":"806 - 813"},"PeriodicalIF":8.3,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46797363","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
A multi-physics simulation model has been established to investigate the influence of Laser powder bed fusion parameters on the spatial composition distribution and grain growth mechanism of the single-track printed dissimilar alloys. Our study shows that alloy composition gradient isosurfaces can be used to visualize the spatial distribution of alloy composition for miscible dissimilar alloys. When the melt pool aspect ratio changes from large to small, the grain growth transitions from the temperature gradient mode to composition gradient mode and then to the mixed mode. Our experimental observations show that in extreme cases, the curved grain angle can reach 272°. GRAPHICAL ABSTRACT IMPACT STATEMENT The study found that the composition gradient of dissimilar alloys can dominate grain growth, which is entirely different from the conventional temperature gradient-dominated grain growth mechanism.
{"title":"Mechanism analysis of grain growth dominated by alloy composition gradients during powder bed fusion","authors":"Liming Yao, Zhongmin Xiao, Zhiongsheng Hoo, Chao Tang, Jing Qiao, Yanmei Zhang","doi":"10.1080/21663831.2023.2250826","DOIUrl":"https://doi.org/10.1080/21663831.2023.2250826","url":null,"abstract":"A multi-physics simulation model has been established to investigate the influence of Laser powder bed fusion parameters on the spatial composition distribution and grain growth mechanism of the single-track printed dissimilar alloys. Our study shows that alloy composition gradient isosurfaces can be used to visualize the spatial distribution of alloy composition for miscible dissimilar alloys. When the melt pool aspect ratio changes from large to small, the grain growth transitions from the temperature gradient mode to composition gradient mode and then to the mixed mode. Our experimental observations show that in extreme cases, the curved grain angle can reach 272°. GRAPHICAL ABSTRACT IMPACT STATEMENT The study found that the composition gradient of dissimilar alloys can dominate grain growth, which is entirely different from the conventional temperature gradient-dominated grain growth mechanism.","PeriodicalId":18291,"journal":{"name":"Materials Research Letters","volume":"11 1","pages":"814 - 820"},"PeriodicalIF":8.3,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42046733","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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