International Journal of Plasticity最新文献

{"title":"Mitigating creep anisotropy of largely pre-deformed Al-Cu alloys by shape tailoring of dislocation sub-structures","authors":"Longhui Chen ,&nbsp;Chunhui Liu ,&nbsp;Peipei Ma ,&nbsp;Lihua Zhan ,&nbsp;Jianshi Yang ,&nbsp;Minghui Huang","doi":"10.1016/j.ijplas.2025.104350","DOIUrl":"10.1016/j.ijplas.2025.104350","url":null,"abstract":"<div><div>Introducing high-density dislocations by large pre-deformation could afford a significant increase in both the creep formability and mechanical properties of aluminum alloys. However, the strong creep anisotropy typical of the alloy sheets prepared by this method, e.g. cold-rolling with a large thickness reduction, leads to the difficulty in accurate creep age forming of doubly curved panels. Clarifying the influence of different types of microstructures on the creep deformation is pivotal in tailoring the creep anisotropy of largely pre-deformed Al alloys. This study investigated the creep aging responses of largely pre-deformed Al-Cu alloys prepared using two different processes, i.e. unidirectional rolling and cross-rolling, with a same total thickness reduction of 80 %. Cross-rolling was applied by changing the rolling direction by 90° about normal direction in the second step. The in-plane creep anisotropy index of the sample prepared through the 3:1 (ratio of the reductions in two steps) cross-rolling scheme is about 13 %, much lower than that (about 49 %) of the unidirectional rolling sample. The as-rolled and creep-aged samples for unidirectional rolling, 1:1 and 3:1 cross-rolling exhibited similar tensile properties and had a yield strength anisotropy index less than 6 %. Detailed characterizations by electron back-scattering diffraction (EBSD) and scanning transmission electron microscopy (STEM) reveal that cross-rolling mainly changes the dislocation substructures rather than the grain orientations and precipitates in the largely pre-deformed alloys. The dislocation cells with a diameter ranging from 400 nm to 1.8 μm changed from the \"elliptical\" shape in the unidirectional rolling sample to a \"circular\" shape in the 3:1 cross rolling sample. The crystal plasticity finite element models considering the effect of dislocation substructures were established to simulate the creep deformation in the largely pre-deformed Al alloys. Multi-scale experimental characterizations and crystal plasticity finite element simulations demonstrate that the texture and grain shape have little influence while the dislocation substructure plays a dominant role in the creep anisotropy in the largely pre-deformed Al-Cu alloys. Our findings inspire alleviating creep anisotropy of largely pre-deformed Al alloys by shape tailoring of dislocation sub-structures.</div></div>","PeriodicalId":340,"journal":{"name":"International Journal of Plasticity","volume":"189 ","pages":"Article 104350"},"PeriodicalIF":9.4,"publicationDate":"2025-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143872860","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}

{"title":"Zirconium δ-hydrides: Strain localisation, ratcheting, and fatigue crack propagation","authors":"Daniel J. Long ,&nbsp;Thibaut Dessolier ,&nbsp;T. Ben Britton ,&nbsp;Stella Pedrazzini ,&nbsp;Fionn P.E. Dunne","doi":"10.1016/j.ijplas.2025.104344","DOIUrl":"10.1016/j.ijplas.2025.104344","url":null,"abstract":"<div><div>As many nations commit to achieving Net Zero, many low carbon scenarios indicate that civil nuclear power generation and the economics thereof are set to play a vital role. To maximise nuclear reactor operation lifetimes, it is essential to develop mechanistic understanding of failure and degradation mechanisms in safety-critical components for increasingly holistic reactor design codes and standards. In this paper, advanced micromechanical testing with in situ digital image correlation is used in combination with crystal plasticity modelling to study various aspects of damage associated with δ hydride precipitates in Zircaloy-4 for reactor fuel cladding applications. Measurements of static and cyclic hydride precipitation strains demonstrate a discernible strain field directionality (associated with intragranular precipitation) which was not previously reported, while cyclic thermomechanical loads are shown to promote the cyclic accumulation of strain due to repeated precipitation and dissolution of hydrides (hydride strain ratcheting) for up to five cycles, leading to the development of networks of geometrically necessary dislocations. Using crystal plasticity finite element modelling of the volumetric expansion associated with hydride precipitation, the strain directionality phenomenon is shown to be linked with hydride morphology. Comparisons with experimental strain fields also suggest that hydride plasticity is an important consideration for damage accumulation during precipitation. Experimental measurements of short fatigue crack propagation through Zircaloy-4 microstructures containing hydrides reveal new crack propagation mechanisms including decohesion, which on average, lead to accelerated rates of crack growth. Twins and hydride precipitation therein are also implicated in even more damaging fatigue behaviour as fatigue cracks are provided a seemingly brittle and direct path for fracture, which was not previously reported in the literature.</div></div>","PeriodicalId":340,"journal":{"name":"International Journal of Plasticity","volume":"190 ","pages":"Article 104344"},"PeriodicalIF":9.4,"publicationDate":"2025-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143872858","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}

{"title":"An anisotropic thermo-mechanically coupled constitutive model for glass fiber reinforced polyamide 6 including crystallization kinetics","authors":"Marie-Christine Reuvers ,&nbsp;Christopher Dannenberg ,&nbsp;Sameer Kulkarni ,&nbsp;Michael Johlitz ,&nbsp;Alexander Lion ,&nbsp;Stefanie Reese ,&nbsp;Tim Brepols","doi":"10.1016/j.ijplas.2025.104341","DOIUrl":"10.1016/j.ijplas.2025.104341","url":null,"abstract":"<div><div>In order to achieve process stability in the industrial thermoforming of fiber reinforced polymers (FRPs), typically, cost- and time-intensive trial-and-error-processes are required. The experimental boundary conditions, as well as the material composition and component design optimization, are highly dependent on material phenomena related to various material scales and constituents. It is therefore necessary to develop finite element constitutive models that are validated against experimental results and incorporate various material phenomena in order to reduce the experimental effort and evaluate the composite’s performance with reliable predictions. In this work, an existing thermo-mechanically coupled constitutive model for polyamide 6 is extended in a thermodynamically consistent manner to represent the anisotropic composite behavior, including anisotropic conduction, thermal expansion as well as internal heat generation associated with irreversible processes. Furthermore, the crystallization process is incorporated using experimental standard (S-DSC) and flash (F-DSC) differential scanning calorimetry results. The thermal and mechanical model parameters of the homogenized macroscopic material formulation are identified and the model response is successfully validated with a data base comprising both experimental and virtual results. Finally, the model capabilities are assessed in several thermo-mechanical structural computations, including a 3D thermoforming example in comparison with experimental results. In particular, the influence of the anisotropy on material self-heating, thermal expansion and the resulting crystalline state is investigated, demonstrating the potential of this new approach to efficiently and accurately predict FRPs in the future. Our source code, data, and exemplary input files are available under <span><span>https://doi.org/10.5281/zenodo.15052983</span><svg><path></path></svg></span>.</div></div>","PeriodicalId":340,"journal":{"name":"International Journal of Plasticity","volume":"189 ","pages":"Article 104341"},"PeriodicalIF":9.4,"publicationDate":"2025-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143862280","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}

{"title":"Ultra-strong and ductile magnesium alloy enabled by ultrafine grains with nano-spacing solute-enriched planar defects","authors":"Zhi Zhang ,&nbsp;Jinshu Xie ,&nbsp;Jinghuai Zhang ,&nbsp;Ruizhi Wu ,&nbsp;Jian Wang ,&nbsp;Xu-Sheng Yang","doi":"10.1016/j.ijplas.2025.104348","DOIUrl":"10.1016/j.ijplas.2025.104348","url":null,"abstract":"<div><div>Mg_96.3Ho_1.6Y_1.2Zn_0.8Zr_0.1 (at.%) alloy with sub-micron ultrafine grains containing nano-spacing solute-enriched planar defects is developed to exhibit high strengths (yield strength = ∼ 382 MPa and ultimate tensile strength = ∼ 426 MPa) and good ductility (fracture elongation = 19 %), compared to the as-homogenized counterpart (yield strength = ∼ 160 MPa, ultimate tensile strength = ∼ 225 MPa, and fracture elongation = 7.5 %). Ultrafine grains with an average grain size of ∼ 940 nm is attained via particle-stimulated nucleation mechanism induced by the second Mg₁₂(Ho,Y)Zn phase during hot extrusion. A substantial number of ultrafine grains are formed surrounding these second-phase grains. The addition of Ho/Y/Zn elements lowers the <em>I</em>₁ stacking fault energy, facilitating the formation of <em>I</em>₁-type fault loops and promoting the activity of &lt;c+a&gt; dislocations. Meanwhile, the nano-spacing solute-enriched planar defects (including long-period stacking order structure and <em>I₂</em>-type stacking faults) effectively hinder the motion of &lt;c+a&gt; dislocations, increasing flow stress while simultaneously promoting the activation of new &lt;c+a&gt; dislocations. As a result, the synergistic effect between ultrafine grains and solute-enriched planar defects significantly enhances the yield strength and facilitates the numerous non-basal dislocation activity responsible for significantly improved ductility. In addition, the refined second deformable Mg₁₂(Ho,Y)Zn phase further strengthens the alloy and effectively delays the formation of macrocracks to improve the ductility. This study not only present an efficient strategy for developing high-strength, high-ductility Mg alloys but also provides new insights into the interplay between planar defects and dislocations.</div></div>","PeriodicalId":340,"journal":{"name":"International Journal of Plasticity","volume":"189 ","pages":"Article 104348"},"PeriodicalIF":9.4,"publicationDate":"2025-04-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143853155","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}

{"title":"Deformation Behavior and Strengthening Mechanisms of an Additively Manufactured High-Entropy Alloy with Hierarchical Heterostructures","authors":"Yunjian Bai ,&nbsp;Yadong Li ,&nbsp;Yizhe Liu ,&nbsp;Cheng Yang ,&nbsp;Yun-Jiang Wang ,&nbsp;Kun Zhang ,&nbsp;Bingchen Wei","doi":"10.1016/j.ijplas.2025.104347","DOIUrl":"10.1016/j.ijplas.2025.104347","url":null,"abstract":"<div><div>Additive manufacturing (AM) of high-entropy alloys (HEAs) typically results in the formation of unique microstructures and deformation mechanisms, sparking widespread research interest. This study delves into the deformation behavior and strengthening mechanisms of an AMed HEA with hierarchical heterostructures. The results show that the alloy consists of the FCC matrix, coherent L1₂ precipitates, incoherent L2₁ precipitates with lens-shaped inclusions, and chemical cells. The distribution of the L2₁ phase and the lens-shaped inclusions are unique phenomena, mainly attributed to local chemical fluctuations during the AM process. The FCC matrix primarily contributes to plastic deformation, with L1₂ precipitates enhancing strength through ordered strengthening, and L2₁ precipitates providing strengthening via Orowan bypassing mechanism. Additionally, dislocation strengthening also contributes to the overall strength. Notably, the lens-shaped structures within the L2₁ phase undergo a stress-induced martensitic transformation during deformation, attributed to their inherent metastability, favorable microstructural locations and grain orientations. These findings deepen the understanding of the microstructures and deformation mechanisms of AMed HEAs, offering valuable insights for the design and optimization of high-performance HEAs in the future.</div></div>","PeriodicalId":340,"journal":{"name":"International Journal of Plasticity","volume":"189 ","pages":"Article 104347"},"PeriodicalIF":9.4,"publicationDate":"2025-04-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143853156","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}

{"title":"A Physically Grounded Model for Size Effects in the Initial Yielding of Metallic Materials with Deformation Heterogeneity","authors":"Jianfeng Zhao ,&nbsp;Xu Zhang ,&nbsp;Songjiang Lu ,&nbsp;Dabiao Liu ,&nbsp;Hui Chen ,&nbsp;Guozheng Kang","doi":"10.1016/j.ijplas.2025.104345","DOIUrl":"10.1016/j.ijplas.2025.104345","url":null,"abstract":"<div><div>The size effect in the initial yielding of metallic materials with deformation heterogeneity has garnered significant attention. However, the underlying physics of this effect remains unclear, and physically grounded models that quantify the relationship between microstructure and mechanical properties are still lacking. Here, we revisit both stress and strain gradient plasticity models, focusing particularly on the stress gradient model due to its physical material length scale and straightforward numerical implementation. By deriving yield stress models based on single-ended dislocation pileup, we identify a critical issue in stress gradient models: the assumption of dislocation pile-up configurations significantly affects yield stress predictions. To elucidate the dislocation mechanisms driving the size-dependent yielding behavior, we investigate two benchmark cases in gradient theories: homogeneous materials undergoing nonuniform deformation and heterostructured materials undergoing uniform deformation, utilizing nonlocal crystal plasticity and discrete dislocation dynamics simulations, respectively. The results not only clarify the issue raised in stress gradient theory, but also suggest the mechanism that pileup-induced stress plays a dominant role in governing the size effect during initial yielding for both homogeneous materials and heterostructured materials. These insights lead to the development of a new physically grounded model based on pileup-induced internal stress, i.e., back stress, which quantitatively predicts the size effect in the initial yielding of heterostructured material under tension and homogeneous material under torsion. This work clarifies the dislocation mechanisms governing extra strengthening in metallic materials with deformation heterogeneity and introduces a physically-based model quantitatively correlating the microstructures with the mechanical properties of heterostructured materials.</div></div>","PeriodicalId":340,"journal":{"name":"International Journal of Plasticity","volume":"189 ","pages":"Article 104345"},"PeriodicalIF":9.4,"publicationDate":"2025-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143849745","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}

{"title":"Unravelling the deformation mechanisms in Ni-rich high entropy alloy with tailored Ti content: An experimental and atomistic approach","authors":"Sudhansu Maharana,&nbsp;Sankalp Biswal,&nbsp;Manashi Sabat,&nbsp;D.K.V.D. Prasad,&nbsp;Tapas Laha","doi":"10.1016/j.ijplas.2025.104346","DOIUrl":"10.1016/j.ijplas.2025.104346","url":null,"abstract":"<div><div>Ti-containing face centred cubic (FCC) high entropy alloys (HEAs) have garnered significant attention due to their exceptional mechanical properties. Nevertheless, the role of Ti on contributory strengthening mechanisms and the corresponding deformation behavior remains less explored till date. The present study sheds light on evolution of microscale plastic deformation mechanism and the associated strengthening effects induced by Ti addition in a novel spark plasma sintered Ni_46-xCo_18-xAl₁₂Cr₈Fe₁₂Mo_4-yTi_2z (<em>x</em> = 0, <em>y</em> = 0, <em>z</em> = 0; <em>x</em> = 0, 1 and 2, <em>y</em> = 2, <em>z</em> = 1, 2 and 3 at. %) HEA through a combination of experimental analyses and molecular dynamics (MD) simulations. The sintered compacts were composed of FCC solid solution with presence of minor amounts of brittle Cr-rich and Mo-rich sigma (σ) phases, along with essential L1₂ phase in the FCC matrix. Yield strength and compressive strength increased continuously with increasing Ti content, from 1130 MPa and 1809 MPa in Ti-free HEA to 1452 MPa and 2011 MPa in 6 at. % Ti containing HEA, respectively, while maintaining an appreciable fracture strain &gt; 26 % in all the consolidated HEAs. Such remarkable mechanical properties are primarily attributed to inherent solid solution strengthening from Ti-induced lattice distortion, along with synergistic effect of narrow twin boundaries, finer grain size and precipitation strengthening from L1₂ phase. Furthermore, MD simulation revealed that increasing Ti content lowered stacking fault energy of the HEAs and promoted formation of deformation twins (DTs) and stacking faults (SFs). Characterization of deformed microstructures at sequential strain levels showed that plastic deformation in Ti-free HEA was primarily mediated by ordinary dislocation slip, whereas with increase in Ti content, plastic deformation predominantly proceeded through formation of SF networks and DTs, alongside dislocation gliding. Additionally, increased dynamic recrystallization fraction in higher Ti-containing HEAs during loading, attributed to increased pre-existing strain within grains, contributed in retaining impressive ductility. This study provides comprehensive insights into the deformation mechanisms in Ti-added Ni-rich FCC HEAs and offers guidance for designing high-performance HEAs.</div></div>","PeriodicalId":340,"journal":{"name":"International Journal of Plasticity","volume":"189 ","pages":"Article 104346"},"PeriodicalIF":9.4,"publicationDate":"2025-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143846553","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}

{"title":"Two-phase microstructure-based crystal plasticity constitutive model for nickel-based single crystal superalloys incorporating Re effects on rafting and dislocation evolution","authors":"Xiaowei Li ,&nbsp;Yaxin Zhu ,&nbsp;Lv Zhao ,&nbsp;Shuang Liang ,&nbsp;Minsheng Huang ,&nbsp;Zhenhuan Li","doi":"10.1016/j.ijplas.2025.104343","DOIUrl":"10.1016/j.ijplas.2025.104343","url":null,"abstract":"<div><div>The unique two-phase microstructure of nickel-based single crystal superalloys (NBSCSs) imparts exceptional high-temperature mechanical properties, promoting the use of NBSCSs for turbine blades. A moderate addition of rhenium (Re) can further enhance the mechanical properties by influencing dislocation evolution within the two-phase microstructure and mitigating rafting. The present work aims to quantitatively correlate dislocation evolution and rafting in the two-phase microstructure with the macroscopic mechanical behavior of NBSCSs. To this end, a representative volume element (RVE) consisting of a cubic precipitate surrounded by horizontal and vertical matrix channels is built, and a micromechanical homogenization method based on small perturbation analysis is adopted. To improve the computational efficiency while maintaining a reasonable accuracy, an approximate algorithm is proposed. Based on this, a two-phase microstructure-based crystal plasticity (CP) constitutive model that incorporates Re-influenced dislocation evolution mechanisms and accounts for Re-influenced evolution of the two-phase microstructure (i.e., rafting) has been developed. Using a unified set of constitutive parameters, this CP model successfully predicts both the instantaneous plasticity and prolonged-time creep behaviors of NBSCSs under various temperatures, loading rates and loading orientations. It is noteworthy that the influence of Re doping on both dislocation evolution and rafting is considered in the present CP model, significantly enhancing its ability for describing the mechanical behavior of NBSCSs.</div></div>","PeriodicalId":340,"journal":{"name":"International Journal of Plasticity","volume":"189 ","pages":"Article 104343"},"PeriodicalIF":9.4,"publicationDate":"2025-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143836870","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}

{"title":"Effect of twinning on shear localization of Al0.1CoCrFeNi high entropy alloy at high strain rates: Experiment and crystal plasticity modeling","authors":"Wen An ,&nbsp;Jiang-Peng Yang ,&nbsp;Chuan-Zhi Liu ,&nbsp;Qi-Lin Xiong","doi":"10.1016/j.ijplas.2025.104339","DOIUrl":"10.1016/j.ijplas.2025.104339","url":null,"abstract":"<div><div>As one of the most important plastic deformation mechanisms of high-entropy alloys, deformation twinning can increase the strength without losing plasticity. Nevertheless, recent studies have shown that high-density twins can form \"soft spots\" and promote the occurrence of shear localization failure at high strain rates. The extent to which deformation twins contribute to the formation of shear localization remains unclear. In this study, a series of dynamic uniaxial compression experiments have been performed with Al_0.1CoCrFeNi HEAs under different conditions to disclose the dynamic recrystallization mechanism. Corresponding to the dynamic recrystallization and plastic dissipation mechanisms at high strain rates, a dislocation entanglement model has been established in conjunction with deformation twinning and physically based heat dissipation to capture the process of shear localization formation. The dislocation entanglement model has been integrated into the theoretical framework of crystal plasticity to perform finite element simulations of high-strain rate deformations. The results predicted by the crystal plasticity simulations are in good agreement with the experimental data, confirming the rationality of the new constitutive model. Deformation twinning can significantly improve strain hardening ability and resistance to shear localization. Interestingly, when the volume fraction of twins reaches a certain level, the mechanism of twin-assisted continuous dynamic recrystallization is triggered due to the interaction between dislocations and twins, resulting in the formation of many “soft spots” (corresponding to the twin region with high density). Upon further deformation, these “soft spots” continue to evolve and aggregate to eventually form the bands of shear localization. Our results can be used for the microstructure design of dynamic high-performance metals with high strength and plasticity to artificially control shear localization.</div></div>","PeriodicalId":340,"journal":{"name":"International Journal of Plasticity","volume":"189 ","pages":"Article 104339"},"PeriodicalIF":9.4,"publicationDate":"2025-04-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143822646","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}

{"title":"Tensile behavior of additively manufactured Inconel 718 and stainless steel 316L with compositionally graded joints","authors":"Yaojie Wen ,&nbsp;Yang Gao ,&nbsp;Ramasubramanian Lakshmi Narayan ,&nbsp;Wei Cai ,&nbsp;Pei Wang ,&nbsp;Xiaoding Wei ,&nbsp;Baicheng Zhang ,&nbsp;Upadrasta Ramamurty ,&nbsp;Xuanhui Qu","doi":"10.1016/j.ijplas.2025.104342","DOIUrl":"10.1016/j.ijplas.2025.104342","url":null,"abstract":"<div><div>The microstructure and tensile behavior of laser powder bed fusion (LPBF) processed 316L austenitic stainless steel (316L) and Inconel 718 Ni-based superalloy (IN718) coupons with compositionally graded joints (CGJ), spanning lengths of 0, 10 and 20 mm, in the as built and heat-treated conditions, are investigated. In the as built condition, the microstructure of pure 316L and IN718 ligaments consist of micron-sized sub-grains present within 〈001〉 textured columnar grains, whereas CGJs contain a mixture of randomly textured columnar and equiaxed grains. Heat treatment, involving solutionizing above 1040 °C with subsequent ageing at 720 and 620 °C, leads to the recrystallization of portions with &gt; 85 wt. % IN718 of the CGJ coupons. Higher composition gradient span, in both the as built and heat-treated states, improves the yield and tensile strengths of the specimens, but compromises ductility. Simulations indicate that CGJs with shallower composition gradients have lower fluctuations in the stress triaxiality, von mises equivalent stress, and the maximum shear stress compared to those with sharper gradients. These mechanical property variations and the deformation characteristics of the CGJ specimens are analyzed in detail by considering the varying degrees of plastic constraint on the 100 wt. % 316L and the degree of interactions between strain-generated dislocations and geometrically necessary dislocations. Finally, the effectiveness of CGJ in enhancing the tensile properties of the 316L/IN718 joints and the geometrical considerations for designing such joints for different alloy combinations is discussed.</div></div>","PeriodicalId":340,"journal":{"name":"International Journal of Plasticity","volume":"189 ","pages":"Article 104342"},"PeriodicalIF":9.4,"publicationDate":"2025-04-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143822647","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}