In-Situ Nanoparticles: A New Strengthening Method for Metallic Structural Material

Pan, Shiwei; Zhou, Xianwei; Chen, Kaixuan; Yang, Ming; Cao, Yudong; Chen, Xiaohua; Wang, Zidong

doi:10.3390/app8122479

Cited by 11 publications

(6 citation statements)

References 88 publications

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“…A dislocation with a Burgers vector of 1/2〈110〉 (marked by “⊥”) appeared close to the boundary instead of lying at the boundary. It was noted that the coherent interface between nanoparticles and matrix with low mismatch and little lattice distortion could effectively facilitate the release of stress concentrations, generating considerable plastic strain 15 . The high coherency of α–β interfaces and α–α intersections implied limited resistance for dislocation transferring.…”

Section: Resultsmentioning

confidence: 99%

Transportation of dislocation plasticity in a dual-phase TiMo alloy

Men

2023

Sci Rep

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Understanding the coordinated deformation of multiple phases under applied stress is crucial for the structural design of dual-phase or multiphase advanced alloys. In this study, in-situ transmission electron microscope tensile tests were performed to investigate the dislocation behaviors and the transportation of dislocation plasticity during the deformation of a dual-phase Ti-10(wt.%) Mo alloy having hexagonal close-packed α phase and body-centered cubic β phase. We demonstrated that the dislocation plasticity preferred to transmit from alpha to alpha phase along the longitudinal axis of each plate, regardless of where dislocations were formed. The intersections of different α plates provided local stress concentration that facilitated the initiation of dislocation activities from there. Dislocations then migrated along the longitudinal axis of α plates and carried dislocation plasticity from one plate to another through these intersections as well. Since the α plates distributed in various orientations, dislocation slips occurred in multiple directions, which is beneficial for uniform plastic deformation of the material. Our micropillar mechanical testing further quantitatively demonstrated that the distribution of α plates and the α–α plates’ intersections plays important role in tuning the mechanical properties of the material.

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Section: Resultsmentioning

confidence: 99%

Transportation of dislocation plasticity in a dual-phase TiMo alloy

Men

2023

Sci Rep

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“…The Ti6Al4V-TiC composites' hardness varied between 422HV and 459HV, compared with 420HV for plain Ti6Al4V in this study, and 391HV (Ali et al, 2017) and 386HV (Ali et al, 2018) in previous studies using the same parent Ti6Al4V alloy and SLM equipment. The presence of TiC particles can improve the strength of composite parts through the mechanisms of grain refinement, Orowan strengthening and increased dislocation density (AlMangour et al, 2017(AlMangour et al, , 2018Ferguson et al, 2014;Pan et al, 2018;Wei et al, 2017;Yu et al, 2019). It is also likely that some residual solid solution carbon dissolved within the parent b-matrix, which is then incorporated into the a 0 -matrix by the diffusionless martensitic transformation.…”

Section: Microstructure and Hardnessmentioning

confidence: 99%

In situ TiC reinforced Ti6Al4V matrix composites manufactured via selective laser melting

Gülenç,

Bai,

Mitchell

et al. 2023

RPJ

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Purpose Current methods for the preparation of composite powder feedstock for selective laser melting (SLM) rely on costly nanoparticles or yield inconsistent powder morphology. This study aims to develop a cost-effective Ti6Al4V-carbon feedstock, which preserves the parent Ti6Al4V particle’s flowability, and produces in situ TiC-reinforced Ti6Al4V composites with superior traits. Design/methodology/approach Ti6Al4V particles were directly mixed with graphite flakes in a planetary ball mill. This composite powder feedstock was used to manufacture in situ TiC-Ti6Al4V composites using various energy densities. Relative porosity, microstructure and hardness of the composites were evaluated for different SLM processing parameters. Findings Homogeneously carbon-coated Ti6Al4V particles were produced by direct mixing. After SLM processing, in situ grown 100–500 nm size TiC nanoparticles were distributed within the α-martensite Ti6Al4V matrix. The formation of TiC particles refines the Ti6Al4V β grain size. Relative density varied between 96.4% and 99.5% depending on the processing parameters. Hatch distance, exposure time and point distance were all effective on relative porosity change, whereas only exposure time and point distance were effective on hardness change. Originality/value This work introduces a novel, cost-effective powder feedstock preparation method for SLM manufacture of Ti6Al4V-TiC composites. The in situ SLM composites achieved in this study have high relative density values, well-dispersed TiC nanoparticles and increased hardness. In addition, the feedstock preparation method can be readily adapted for various matrix and reinforcement materials in future studies.

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“…A dislocation with a Burgers vector of 1/2<110> (marked by "⊥") appeared close to the boundary instead of lying at the boundary. It was noted that the coherent interface between nanoparticles and matrix with low mismatch and little lattice distortion could effectively facilitate the release of stress concentrations, generating considerable plastic strain [15] . The high coherency of α-β interfaces and α-α intersections implied limited resistance for dislocation transferring.…”

Section: Microstructure Of Dual-phase Timo Alloymentioning

confidence: 99%

Transportation of Dislocation Plasticity in a Dual-Phase TiMo Alloy

Men

2022

Preprint

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The structural design of dual-phase or multiphase advanced alloys depends on understanding the coordinate deformation of various phases under applied stress, in which experimentally disclosing the microscopic picture of dislocation plasticity transportation is critical. In this study, in situ transmission electron microscope tensile tests were used to examine the dislocation behaviors occurring during the deformation of a dual-phase Ti-10(wt.%) Mo alloy having hexagonal close-packed α phase and body-centered cubic β phase. The findings demonstrated that the dislocation plasticity preferred to transmit from alpha to alpha in the longitudinal axes of each plate, regardless of where dislocations were formed. Dislocations for the α phase were initially activated in the α phase and migrated along the plate’s longitudinal axis. Specific sites with local stress concentration were created at the intersection of various alpha plates, which made it easier to transfer dislocation plasticity from one plate to another. Nearby α plates’ majority of newly excited dislocations kept moving in a longitudinal direction. Dislocations pinned on the α-β phase boundary of the β phase would decrease resistance as the stress grew and migrate along the longitudinal direction in the α phase. Dislocation slips occurred in multiple directions as a result of α plates’ variable orientation, which might be advantageous for uniform plastic deformation. The findings provide insight into the use of microstructure engineering to enhance the mechanical properties of materials.

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In-Situ Nanoparticles: A New Strengthening Method for Metallic Structural Material

Cited by 11 publications

References 88 publications

Transportation of dislocation plasticity in a dual-phase TiMo alloy

Transportation of dislocation plasticity in a dual-phase TiMo alloy

In situ TiC reinforced Ti6Al4V matrix composites manufactured via selective laser melting

Transportation of Dislocation Plasticity in a Dual-Phase TiMo Alloy

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