Journal of Materials Research and Technology-Jmr&t最新文献

{"title":"Microstructure evolution and mechanical properties of the Mg-Al-Ca-Zn-Mn alloy fabricated by hot extrusion","authors":"Xizao Wang ,&nbsp;Tianjiao Luo ,&nbsp;Yipeng Lv ,&nbsp;Qiuyan Huang ,&nbsp;Ce Zheng ,&nbsp;Yingju Li ,&nbsp;Yuansheng Yang","doi":"10.1016/j.jmrt.2025.09.125","DOIUrl":"10.1016/j.jmrt.2025.09.125","url":null,"abstract":"<div><div>In this work, high-Ca Mg-Al-Ca-Zn-Mn alloys were prepared at different extrusion temperatures (290 °C and 320 °C). At low-temperature extrusion, the yield strength was elevated to 345 MPa, corresponding to an increase of about 100 MPa. In contrast, its elongation value dropped slightly to 6.7 %. The overall performance is comparable to some high-Ca AXM alloys produced through ECAP. An analysis was conducted on the DRX mechanisms and texture evolution. At the early stage, the primary deformation mechanism is (<span><math><mrow><mover><mn>1</mn><mo>‾</mo></mover><mn>012</mn></mrow></math></span>) extrusion twinning. At the late stage, PSN mechanism dominates the DRX process. The texture intensity increases initially and then decreases, and the texture gradually concentrates towards the &lt; <span><math><mrow><mn>10</mn><mover><mn>1</mn><mo>‾</mo></mover><mn>0</mn></mrow></math></span> &gt; component as hot extrusion progresses. This phenomenon mainly depends on the unDRXed grains containing a substantial amount of basal &lt;a&gt; dislocations. The analysis results regarding the strength and plasticity mechanisms indicate that the presence of fine grains and a high density of dislocations are the reasons for high strength, while the low volume fraction of the second phases and the deformable Al₂Ca phases ensure good plasticity.</div></div>","PeriodicalId":54332,"journal":{"name":"Journal of Materials Research and Technology-Jmr&t","volume":"39 ","pages":"Pages 418-429"},"PeriodicalIF":6.6,"publicationDate":"2025-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145109086","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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 Cr content on microstructure, mechanical properties and corrosion properties of Al–Zn–Mg–Cu alloys","authors":"Donghui Yang ,&nbsp;Haitao Zhang ,&nbsp;Xu Li ,&nbsp;Zibin Wu ,&nbsp;Hiromi Nagaumi ,&nbsp;Ke Qin ,&nbsp;Cheng Guo ,&nbsp;Ping Wang ,&nbsp;Dong Wu ,&nbsp;Ziping Li","doi":"10.1016/j.jmrt.2025.09.113","DOIUrl":"10.1016/j.jmrt.2025.09.113","url":null,"abstract":"<div><div>This study explores the effect of Cr content on the microstructure, mechanical properties, and corrosion behavior of Zr-containing Al–Zn–Mg–Cu alloys. The objective is to elucidate how varying Cr levels influence these characteristics to optimize alloy performance for automotive and aerospace applications. Microstructural analysis was conducted using scanning electron microscopy (SEM), transmission electron microscopy (TEM), and electron backscatter diffraction (EBSD). Mechanical properties were evaluated through tensile and hardness testing, while corrosion resistance was assessed via intergranular corrosion (IGC) and exfoliation corrosion (EXCO) tests. The results reveal that Cr addition narrows the precipitation temperature range of the Al₃Zr phase and refines its size and distribution uniformity. Furthermore, Al₇Cr dispersoids effectively hinder recrystallization by obstructing dislocation motion. Under T6 heat treatment, increasing Cr content enhances strength as well as resistance to intergranular and exfoliation corrosion. The alloy containing 0.2 wt% Cr exhibited optimal mechanical properties, with a yield strength of 523.5 MPa, an ultimate tensile strength of 598.2 MPa, and an elongation of 13.99 %. The underlying strengthening mechanisms are also discussed. These findings provide valuable insights for alloy design and industrial applications of 7xxx series aluminum alloys.</div></div>","PeriodicalId":54332,"journal":{"name":"Journal of Materials Research and Technology-Jmr&t","volume":"39 ","pages":"Pages 338-354"},"PeriodicalIF":6.6,"publicationDate":"2025-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145108641","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Behavior of reinforced cemented tungsten tailings composites considering End-Hook, Molten-Drawn and Shear-Wave steel fibers","authors":"Yanxi Liu ,&nbsp;Shuai Cao ,&nbsp;Erol Yilmaz","doi":"10.1016/j.jmrt.2025.09.092","DOIUrl":"10.1016/j.jmrt.2025.09.092","url":null,"abstract":"<div><div>Backfill incorporating fiber is increasingly utilized in mine fill applications, offering enhanced performance as a composite material influenced by fiber type and dosage. This study examines the impact of several sorts/dosages of steel fibers on strength characteristics of steel fiber-based cementitious tungsten tailings backfill (SFCTB). The steel fibers tested include End-Hook (EH), Molten-Drawn (MD), and Shear-Wave (SW) types, with dosages of 0.5 %, 1.0 %, 1.5 %, and 2.0 %. A control group was established, and 52 specimens were prepared for analysis. Uniaxial compressive strength (UCS) tests and SEM observations were conducted to evaluate strength and microstructural features. Results indicate that adding steel fibers at equivalent dosages enhances UCS and alters stress-strain curves' morphology. Post-fracture slopes of stress-strain curves moderated across different fiber types with identical dosages. The average peak strength of EH-2.0 %, MD-1.5 %, and SW-2.0 % shows the most significant changes, increasing by 50 %, 44 %, and 50 % respectively, with their compressive strengths reaching 1.88 MPa, 1.77 MPa, and 1.87 MPa. A quadratic relationship was observed between fiber dosage and UCS, with high R² values for the fitted equations. The R-squared values of the steel fiber-reinforced CTB samples (EH, MD, and SW) are 0.8352, 0.9794, and 0.9439 respectively. Increased steel fiber rate also raises the capacity required for SFCTB failure, primarily characterized by tensile damage. Steel fibers inhibit crack propagation and elongation within SFCTBs, enhancing structural integrity. Hydration yields (i.e., C–S–H gel, Aft) improve particle adhesion, internal compactness, and fill strength. This study's findings highlight how optimizing steel fiber type and dosage can enhance tungsten tailings utilization and fiber-reinforced fill performance, providing valuable theoretical guidance for the efficient application of these composite materials.</div></div>","PeriodicalId":54332,"journal":{"name":"Journal of Materials Research and Technology-Jmr&t","volume":"39 ","pages":"Pages 213-226"},"PeriodicalIF":6.6,"publicationDate":"2025-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145108951","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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 phenomenological constitutive model for deep rolling process simulation of AISI 4140 under high dynamic conditions","authors":"Zhaoyu Chen ,&nbsp;Matthias Hettig ,&nbsp;Jan Schubnell ,&nbsp;Jens Sölter ,&nbsp;Daniel Meyer","doi":"10.1016/j.jmrt.2025.09.111","DOIUrl":"10.1016/j.jmrt.2025.09.111","url":null,"abstract":"<div><div>AISI 4140 alloy steel exhibits complex mechanical behaviors such as the Bauschinger effect, strain rate sensitivity, and strain softening, which traditional constitutive models, like Johnson-Cook model and Chaboche kinematic hardening model, are hard to simultaneously capture. To address this limitation, the present work proposes a phenomenological constitutive model based on the commonly used Johnson-Cook formulation, enhanced by incorporating strain softening, strain rate sensitivity, and the Chaboche kinematic hardening. The developed model is implemented through a vectorised user material (VUMAT) subroutine in Abaqus and validated using numerical simulations of residual stress depth profile induced by deep rolling. It is then applied to simulate deep rolling processes under various forces and rolling speeds. The results demonstrate that the proposed model can accurately reproduce residual stress profiles and internal material loading histories. Among the considered mechanisms, strain rate sensitivity and kinematic hardening are found to be essential for capturing the residual stress evolution, while strain softening plays a secondary role under the investigated conditions.</div></div>","PeriodicalId":54332,"journal":{"name":"Journal of Materials Research and Technology-Jmr&t","volume":"39 ","pages":"Pages 309-321"},"PeriodicalIF":6.6,"publicationDate":"2025-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145108639","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Modeling passive film breakdown in corroded Cu-containing Al–Si alloy","authors":"Rui Wang ,&nbsp;Jikang Zhong ,&nbsp;Dongtao Wang ,&nbsp;Hiromi Nagaumi ,&nbsp;Xiaozu Zhang ,&nbsp;Zhibin Liu ,&nbsp;Lanxi Sun ,&nbsp;Fufa Wu ,&nbsp;Zibin Wu ,&nbsp;Bo Zhang","doi":"10.1016/j.jmrt.2025.09.108","DOIUrl":"10.1016/j.jmrt.2025.09.108","url":null,"abstract":"<div><div>Cu-containing phases are crucial for improving the strength of aluminum alloys, however, their presence is concomitant with severe corrosion. This study investigates the intrinsic relationship between typical Cu-containing phases, surface passive film and corrosion behavior in high Cu-level aluminum alloy by combining electrochemical testing and potential drop model. The experimental results indicate that severe corrosion occurred around the micron-scale Cu-containing primary phases, thereby hindering the formation of a passive film. The passive film on the surface of the nano-scale Cu-containing precipitates is thinner with more defects than that on the Al matrix. Compared with Al–Si alloy, the corrosion current density increases by 8.1 times and the equivalent passive film thickness decreases by 90.0 % in peak-aged Al–Si–Cu–Mg alloy. The model constructed based on experimental findings demonstrates that the passive film on the surface of Cu-containing aluminum alloys undergoes a two-stage process of outward and inward growth, the latter only occurs on Al matrix, resulting in a reduced passive film thickness on Cu-containing phases. The interface between Cu-containing phase and Al matrix is considered as the origin of passive film breakdown, the excessive corrosion process at this interface generates localized stress, which in conjunction with the Cl^- ions inhibition of re-passivation, results in passive film breakdown and localized pittings. Compared to reported models, the model established in this work places greater emphasis on the interface between Al matrix and secondary phases. This enhanced focus facilitates a mechanistic insight into Cu-induced corrosion damage and passive film breakdown in aluminum alloys.</div></div>","PeriodicalId":54332,"journal":{"name":"Journal of Materials Research and Technology-Jmr&t","volume":"39 ","pages":"Pages 818-830"},"PeriodicalIF":6.6,"publicationDate":"2025-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145120956","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Mechanical performance of titanium alloy dental implants with continuously gradient porous structures","authors":"Kaijie Xiao ,&nbsp;Tianmin Guan ,&nbsp;Mingli Liu ,&nbsp;David Hui ,&nbsp;Yun Zhai","doi":"10.1016/j.jmrt.2025.09.112","DOIUrl":"10.1016/j.jmrt.2025.09.112","url":null,"abstract":"<div><div>In the field of dental prosthodontics, gradient porous structures have significant advantages over non-gradient porous structures in terms of stress shielding mitigation and achieving effective force transmission. This study innovatively constructs four types of continuous gradient porous structures: Diamond, Body Centered Cubic, Face Centered Cubic, and Kelvin Cell. Based on the Gibson Ashby theoretical model, the design parameters corresponding to the desired porosity of each structure were designed. Forty porous structures with continuous gradient variations and eight non-gradient porous structures corresponding to the mean values of two linear gradient porosities were constructed according to different gradient directions and continuous gradient intervals. Using selective laser sintering to fabricate continuous gradient structures and characterize their structural and mechanical properties. The results demonstrate that structures with a broader gradient range exhibit superior mechanical performance. The mechanical properties of Kelvin Cell are better in radial gradient porosity; The mechanical properties of Body-Centered Cubic are better in axial gradient porosity. Compared to the non-gradient structure, both gradient-oriented configurations demonstrate the capability to achieve graded stress distribution. This characteristic facilitates efficient load transfer to the alveolar bone, thereby effectively mitigating stress shielding phenomena. Furthermore, the study revealed that highly symmetric structures perform better in the radial gradient direction, while layered topological structures have greater advantages in the axial gradient direction. The findings of this study provide a theoretical basis for optimizing the mechanical properties of titanium alloy dental implants with continuous gradient porous structures, and also offer technical references for the geometric design of dental implants.</div></div>","PeriodicalId":54332,"journal":{"name":"Journal of Materials Research and Technology-Jmr&t","volume":"39 ","pages":"Pages 261-282"},"PeriodicalIF":6.6,"publicationDate":"2025-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145108636","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Microstructure refinement and in vivo evaluation of biodegradable magnesium metal matrix composites","authors":"Pedram Sotoudehbagha ,&nbsp;Alison Grise ,&nbsp;Andrew Romero ,&nbsp;Andres Larraza ,&nbsp;Sun Latt ,&nbsp;Abel Córdova Flores ,&nbsp;Kayley Romero ,&nbsp;John Lovejoy ,&nbsp;Mehdi Razavi","doi":"10.1016/j.jmrt.2025.09.116","DOIUrl":"10.1016/j.jmrt.2025.09.116","url":null,"abstract":"&lt;div&gt;&lt;div&gt;The incorporation of bioactive ceramic particles can enhance the bioactivity of bioabsorbable magnesium (Mg) implants. In this study, a melt shearing process was implemented using a rotor-stator assembly to effectively disperse bioactive glass-ceramic (BG) nanoparticles in the Mg melt during casting. The microstructural, electrochemical, and mechanical properties, as well as in vitro cell behavior of the Mg-5wt.%BG composite prepared using the melt shearing process were compared to a Mg-5wt.%BG composite that was manually mixed (Mg-5BG manual) and to pure Mg. Two metallic wire meshes with pore sizes of 250 μm and 2000 μm were mounted on a wide-opening stator to investigate the effect of pore size on stator performance. The grain size distribution revealed a mixture of an equiaxed rosette-like dendritic structure (rosette-like) and equiaxed grains with a non-dendritic (globular) structure for Mg-5BG shear 250 (76.4 ± 15.7 μm) and a globular structure for Mg-5BG shear 2000 (136.9 ± 44.1 μm) compared to elongated grains in pure Mg (234.1 ± 163.8 μm) and rosette-like structure in Mg-5BG manual (121.4 ± 37.6 μm). Additionally, SEM/EDS analysis confirmed a uniform and narrower distribution of BG particles in the Mg-5BG shear 2000 (∼2–4 μm) compared to the unevenly distributed particles in the Mg-5BG manual (∼7–40 μm). The addition of 5 wt% of BG to Mg melt resulted in the appearance of monticellite (CaMgSiO&lt;sub&gt;4&lt;/sub&gt;), magnesium oxide (MgO), and magnesium silicide (Mg&lt;sub&gt;2&lt;/sub&gt;Si). Mg-5BG shear 2000 exhibited smaller pits after the removal of corrosion products compared to Mg-5BG manual. Mg-5BG shear 2000 and Mg-5BG manual showed slightly increased ultimate compressive strength values (177 ± 7.22 MPa and 172.9 ± 23.96 MPa, respectively) compared to pure Mg (151.8 ± 4.90 MPa, p &gt; 0.05). Electrochemical testing revealed that Mg-5BG shear 2000 had a higher corrosion current density (i&lt;sub&gt;corr&lt;/sub&gt; = 47.2 ± 18.7 μA/cm&lt;sup&gt;2&lt;/sup&gt;) and a less negative corrosion potential (E&lt;sub&gt;corr&lt;/sub&gt; = −1.47 ± 0.03 V) than both pure Mg (i&lt;sub&gt;corr&lt;/sub&gt; = 5.24 ± 1.60 μA/cm&lt;sup&gt;2&lt;/sup&gt;, E&lt;sub&gt;corr&lt;/sub&gt; = −1.56 ± 0.02 V) and Mg-5BG manual (i&lt;sub&gt;corr&lt;/sub&gt; = 6.87 ± 1.14 μA/cm&lt;sup&gt;2&lt;/sup&gt;, E&lt;sub&gt;corr&lt;/sub&gt; = −1.62 ± 0.04 V). In vitro cytocompatibility assay indicated high cell viability with 10 % extracts, although reduced viability was observed with 100 % extracts. &lt;em&gt;In vivo&lt;/em&gt; implantation in a rat femur model was conducted with four groups: intact (without surgery), sham (drilled without an implant), pure Mg implant, and Mg-5BG shear 2000 implant. The Mg-5BG shear 2000 implant revealed superior bone regeneration and callus formation, as assessed by Nano-CT and X-ray imaging, alongside complete or partial implant resorption without observable histological signs of systemic toxicity in muscle, liver, or kidney tissues at 28 days. These findings suggest that Mg-5BG shear 2000 composites could be a promising candidate for bioactive, absorbable bone ","PeriodicalId":54332,"journal":{"name":"Journal of Materials Research and Technology-Jmr&t","volume":"39 ","pages":"Pages 243-260"},"PeriodicalIF":6.6,"publicationDate":"2025-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145108857","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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 μ phase on mechanical properties and wear behavior of CoCrFeNiMox high-entropy alloy coating","authors":"Lan Luo ,&nbsp;Weiqi Xu ,&nbsp;Lingqian Wang ,&nbsp;Zedong Wen ,&nbsp;Shisheng Lu ,&nbsp;Jiansong Zhou","doi":"10.1016/j.jmrt.2025.09.117","DOIUrl":"10.1016/j.jmrt.2025.09.117","url":null,"abstract":"<div><div>The CoCrFeNiMo_x (x = 5,10,15,20,25) high-entropy alloy (HEA) coatings have been designed and prepared by laser cladding, which controls the precipitation of the μ phase by adjusting Mo content. The microstructure evolution, mechanical properties and tribological properties of the coatings have been thoroughly examined. Results show excessive lattice distortion affects the stability of FCC single-phase as Mo content increases, resulting in the precipitation of the μ phase. Moreover, the intergranular precipitated phase associated with higher Mo content exhibits a finer microstructure. High-density dislocations can greatly enhance the hardening ability of the HEA coating. The synergistic mechanisms of solid solution strengthening, fine grain strengthening and precipitation strengthening improves the hardness of the 25 at% Mo-doped FeCoCrNi coating (Mo25 coating: 675 HV_0.2). The higher H/E and H³/E² values of the Mo25 coating exhibit superior ability to resist plastic deformation. At medium and low temperatures, fatigue spalling of Mo-doped CoCrFeNi HEAs is alleviated. At high temperatures, multiple oxides generated in situ form a glaze layer that enhances tribological performance. As a result, the Mo25 coating exhibits good wear resistance at different temperatures. This study not only provides ideas for the μphase strengthening of FCC HEAs, but also further broadens the application of HEAs in the friction environments.</div></div>","PeriodicalId":54332,"journal":{"name":"Journal of Materials Research and Technology-Jmr&t","volume":"39 ","pages":"Pages 1148-1158"},"PeriodicalIF":6.6,"publicationDate":"2025-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145120963","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Densification, microstructure, and mechanical properties of Mo–30W alloys fabricated from conditioned powders","authors":"Xinchang Zhang ,&nbsp;Michael D. McMurtrey ,&nbsp;Arin Preston ,&nbsp;Stephen Raiman ,&nbsp;Dekota Thies ,&nbsp;Jorgen F. Rufner","doi":"10.1016/j.jmrt.2025.09.103","DOIUrl":"10.1016/j.jmrt.2025.09.103","url":null,"abstract":"<div><div>Refractory alloys, such as molybdenum-based systems, are attracting growing interest for applications in extreme environments, such as in the nuclear and aerospace industries. Recent advances in sintering technologies, coupled with mechanical alloying, have enabled the tailored design of these alloys by leveraging powder characteristics to control final microstructures and mechanical properties. In this study, Mo–30W alloys were fabricated using electric field-assisted sintering (EFAS) from ball-milled powders with and without hydrogen treatment to investigate the influence of surface oxides on material properties and sintering behavior. The results revealed that samples processed from as-ball-milled powder contained a high density of oxides within the microstructure, whereas oxide presence was significantly reduced in samples fabricated from hydrogen-treated powders. Interestingly, the two powder types led to opposite trends in grain size distribution: samples from untreated powders exhibited grain refinement from sample periphery to the center, while samples from hydrogen-treated powders showed grain coarsening toward the center. This behavior is attributed to temperature gradients present during sintering due to electrical percolation pathway differences during Joule heating. The powder surface oxides may have influenced the temperature distribution and grain evolution. Microhardness profiles measured along both axial and thickness directions were consistent with the grain size distribution. Furthermore, oxide films on powder surfaces have delayed densification by hindering particle necking and atomic diffusion during sintering.</div></div>","PeriodicalId":54332,"journal":{"name":"Journal of Materials Research and Technology-Jmr&t","volume":"39 ","pages":"Pages 227-242"},"PeriodicalIF":6.6,"publicationDate":"2025-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145108851","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Microstructures, mechanical properties and corrosion behaviors of TIG-welded 9Ni steel joint in simulated marine environment","authors":"Hongsheng Chen,&nbsp;Liteng Han,&nbsp;Huiwen Peng,&nbsp;Xuesong Leng","doi":"10.1016/j.jmrt.2025.09.100","DOIUrl":"10.1016/j.jmrt.2025.09.100","url":null,"abstract":"<div><div>The microstructures, mechanical properties and corrosion behaviors of TIG-welded 9Ni steel joints with Ni-based filler were investigated in simulated marine environment. Results show that the welded joints primarily consist of three regions: the weld zone (WZ), the heat-affected zone (HAZ) and the base material (BM). The WZ region exhibits a cellular dendritic microstructure, the HAZ region features coarse-grained and fine-grained quenched martensitic structures, and the BM region comprises tempered martensite with a small amount of dispersed reversed austenite. The welded joints have excellent mechanical properties, with average yield strengths of 684.4 MPa, tensile strengths of 721.6 MPa and elongation of exceeding 36 %. Corrosion testing demonstrates that the WZ region is always free from corrosion, whereas more corrosion pits and γ-FeOOH corrosion products are formed on the BM region compared to the HAZ region, indicating that the HAZ region possesses superior corrosion resistance compared to the BM region. Deeper corrosion pits are developed near the WZ/HAZ interface because of their electrochemical potential differences. Over time, thick γ-FeOOH rust layer with thin Fe₃O₄ layer at the matrix/rust interface can be formed on the HAZ and BM regions. The predominant corrosion mechanism transitions from localized pitting corrosion to uniform corrosion in the later corrosion stage, resulting in the progressive formation of corrosion steps between the WZ and HAZ regions.</div></div>","PeriodicalId":54332,"journal":{"name":"Journal of Materials Research and Technology-Jmr&t","volume":"39 ","pages":"Pages 108-123"},"PeriodicalIF":6.6,"publicationDate":"2025-09-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145108838","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}