Materials Science and Engineering: A最新文献

{"title":"Slow strain plastic deformation behavior of Ti35 alloy for spent fuel reprocessing: Role of crystallographic texture","authors":"Jianping Xu ,&nbsp;Jinjuan Lv ,&nbsp;Chengze Liu ,&nbsp;Jinping Wu ,&nbsp;Huan Li ,&nbsp;Weizhong Han","doi":"10.1016/j.msea.2025.148526","DOIUrl":"10.1016/j.msea.2025.148526","url":null,"abstract":"<div><div>The effect of crystallographic texture on the plastic deformation behavior of Ti35 alloy is studied by slow strain rate tensile (SSRT) test. Scanning electron microscope (SEM) and Electron backscatter diffraction (EBSD) are used to characterize the microstructure and texture. The results show that the sample with prismatic texture have higher elongation and lower yield strength and ultimate strength, while the samples with random texture and basal texture have lower elongation and higher yield strength and ultimate strength. It is found that macro texture affects the distribution of Schmidt factor of slip system in Ti35 alloy samples, which leads to the difference of slip ability between &lt;a&gt; and &lt;c+a&gt;. It is revealed that when loaded along TD direction, most grain orientations of prismatic textured samples are beneficial to &lt;a&gt; slip, while most grain orientations of random textured and basal textured samples are beneficial to &lt;c+a&gt; slip, which leads to the anisotropy of mechanical properties of three different textured samples under SSRT.</div></div>","PeriodicalId":385,"journal":{"name":"Materials Science and Engineering: A","volume":"940 ","pages":"Article 148526"},"PeriodicalIF":6.1,"publicationDate":"2025-05-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144116497","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":"Breaking strength and ductility trade-off for powder metallurgy Ti alloys with high content of oxygen","authors":"Jinbao Long ,&nbsp;Xiaotao Liu ,&nbsp;Ji Gu ,&nbsp;Xuan Luo ,&nbsp;Kejia Pan ,&nbsp;Jie Pan ,&nbsp;Ning Li","doi":"10.1016/j.msea.2025.148529","DOIUrl":"10.1016/j.msea.2025.148529","url":null,"abstract":"<div><div>Oxygen can enhance the strength of powder metallurgy titanium alloys (P/M Ti alloys), but severely impairing their ductility once its content beyond 3300 ppm. Under this circumstance, this study aims to systematically investigate the effect of oxygen content, ranging from 0.22 wt% to 1.40 wt%, on the mechanical properties and deformation mechanisms of P/M TC4 alloys. Through finely controlling fabrication processes, the P/M TC4 alloys in this oxygen range achieve the tensile strengths of 985 MPa–1222 MPa and the elongations of 23 %–6 %, breaking the longstanding issue of strength and ductility trade-off. Based on comprehensive characterization, it is revealed that when the oxygen is about 0.22 wt%, the robust mechanical performance stems from high density of dislocations, especially for wavy dislocations, combined with micro-twins, which accommodates the strain along the c-axis in HCP crystal structure. As the oxygen reaches to 0.42 wt%, nanoscale α-β-α layered microstructure evolves though partial wavy dislocations transform to planar dislocation, which retards the propagation of cracks and thus possesses decent plasticity. When the oxygen further increases to 0.61 wt%, apart from the layered α-β-α microstructure, stacking faults appears though the density of dislocation decreases, maintaining the plasticity of around 18 %. As the oxygen rises to 0.77 wt%, the dislocation density diminishes noticeably from 8.87 × 10¹⁴m⁻² to 3.54 × 10¹⁴m⁻², rendering the plasticity reduces to 6 %. Moreover, as oxygen increases from 0.22 wt% to 0.77 wt%, the solute strengthening effect contribution increases from 43.3 % to 66.9 % whereas the fraction of dislocation strengthening decreases from 25.6 % to 12.4 %, nonetheless, the fractions of grain size and lattice fraction stress governed strength are almost unaltered.</div></div>","PeriodicalId":385,"journal":{"name":"Materials Science and Engineering: A","volume":"940 ","pages":"Article 148529"},"PeriodicalIF":6.1,"publicationDate":"2025-05-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144116496","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":"Lamellar orientation modulation of Fe–Al alloys","authors":"Mengsong Li ,&nbsp;Zhixiang Qi ,&nbsp;Haixin Peng ,&nbsp;Rui Hou ,&nbsp;Yang Chen ,&nbsp;Gong Zheng","doi":"10.1016/j.msea.2025.148523","DOIUrl":"10.1016/j.msea.2025.148523","url":null,"abstract":"<div><div>Fe–Al intermetallic alloys, known for their superior oxidation and corrosion resistance, show broad application prospects in various industries. Among all Fe–Al phases and structures, alloys with a fully lamellar structure produced by the eutectoid transformation Fe₅Al₈(ε) → FeAl + FeAl₂ exhibit better resistance to cracking especially when the lamellar orientation is aligned parallel to the loading direction. To achieve Fe–Al alloys with parallel lamellar orientation, we analyze the interface between Fe₅Al₈ and FeAl₂ during phase transformation. The Bramfitt planar disregistry method is then used to quantitatively compare the differences between 0°- and 45°- oriented lamellae. The calculated disregistry is 46.2 % for 0°-oriented lamellae and 58.6 % for 45°-oriented lamellae, which demonstrates a controllable window for regulating lamellar orientation between 0° and 45°. Accordingly, directional solidification is employed to control the undercooling, as well as the nucleation and growth of lamellae with different orientations. The mechanical tests indicate that 0°-oriented lamellae exhibit better performance compared with both 45°-oriented lamellae and as-cast alloys. Thus, this fixed lamellar orientation could provide expanded opportunities for Fe–Al intermetallic applications.</div></div>","PeriodicalId":385,"journal":{"name":"Materials Science and Engineering: A","volume":"939 ","pages":"Article 148523"},"PeriodicalIF":6.1,"publicationDate":"2025-05-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144099112","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":"Microstructural evolution and mechanical property enhancement: Thin-walled structures of an Inconel 718 superalloy fabricated via hybrid laser–arc directed energy deposition","authors":"Wei Zhang ,&nbsp;Chengzhu Piao ,&nbsp;Baihao Cai ,&nbsp;Pengfei Gao ,&nbsp;Zhenwen Chen ,&nbsp;Chenyu Liu ,&nbsp;Mengwei Duan ,&nbsp;Jian Kong ,&nbsp;Kehong Wang ,&nbsp;Yong Peng","doi":"10.1016/j.msea.2025.148522","DOIUrl":"10.1016/j.msea.2025.148522","url":null,"abstract":"<div><div>Arc-directed energy deposition (Arc-DED) of the Inconel 718 (IN718) superalloy offers distinct advantages, such as low cost and high deposition efficiency. However, these methods are plagued by problems such as poor forming accuracy, coarse microstructures, and suboptimal mechanical properties. This study introduces a laser beam as an auxiliary heat source for the arc, seeking to present a novel approach to fabricate high-performance thin-walled structures of the IN718 superalloy. By contrasting the effects of Arc-DED and hybrid laser–arc directed energy deposition (HLA-DED) on the fabrication of thin-walled IN718 superalloy components, we find that HLA-DED technology significantly improves the forming accuracy, refines the microstructure, and enhances the mechanical properties of thin-walled structures. Specifically, compared with Arc-DED, the thin walls produced by HLA-DED show an 18.39 % increase in the effective width coefficient and a 59.13 % reduction in the machining allowance. Additionally, the significantly large heat input in HLA-DED expands the remelting region, leading to a higher microhardness of the samples. Prolonged in situ heat treatment during HLA-DED promotes the dissolution of Laves phases (950 °C) and subsequent precipitation of γ″ strengthening phases and MC carbides (650 °C). These improvements significantly enhance both the strength and plasticity of the IN718 superalloy components fabricated via HLA-DED. As a result, compared with the Arc-DED samples, the HLA-DED samples exhibit superior yield strength, ultimate tensile strength and elongation in both the horizontal and vertical directions.</div></div>","PeriodicalId":385,"journal":{"name":"Materials Science and Engineering: A","volume":"940 ","pages":"Article 148522"},"PeriodicalIF":6.1,"publicationDate":"2025-05-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144123415","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":"Deformation behavior and strengthening mechanism analysis of newly designed Co31.5Fe18.5Ni31.5Al18.5 eutectic high-entropy alloy by calculating solidification paths","authors":"Lei Wang ,&nbsp;Rongrong Wang ,&nbsp;Sihan Liu ,&nbsp;Yongfei Lv ,&nbsp;Haijun Su ,&nbsp;Xi Jin ,&nbsp;Bo Deng ,&nbsp;Yunpeng Zhang ,&nbsp;Jun Shen ,&nbsp;Guojun Zhang","doi":"10.1016/j.msea.2025.148524","DOIUrl":"10.1016/j.msea.2025.148524","url":null,"abstract":"<div><div>A novelCo_31.5Fe_18.5Ni_31.5Al_18.5 eutectic high-entropy alloy (EHEA) is designed through computational prediction of solidification paths using JMatPro. The microstructure features eutectic dendrites and cells, with the two-phase eutectic showing characteristic lamellar structures of alternating NiAl-rich B2 (ordered BCC) and CoFeNi-rich L1₂ (ordered FCC) phases. TEM analysis reveals a semi-coherent relationship between BCC and FCC phases, i.e., [011]_FCC// <span><math><mrow><mo>[</mo><mrow><mover><mn>1</mn><mo>‾</mo></mover><mn>11</mn></mrow><mo>]</mo></mrow></math></span> _BCC and <span><math><mrow><mo>(</mo><mrow><mover><mn>1</mn><mo>‾</mo></mover><mover><mn>1</mn><mo>‾</mo></mover><mn>1</mn></mrow><mo>)</mo></mrow></math></span> _FCC//<span><math><mrow><mo>(</mo><mrow><mn>01</mn><mover><mn>1</mn><mo>‾</mo></mover></mrow><mo>)</mo></mrow></math></span> _BCC. The Co_31.5Fe_18.5Ni_31.5Al_18.5 EHEA exhibits a yield strength of 571 ± 15 MPa and an ultimate strength of 975 ± 5 MPa with a ductility of 6.9 ± 0.3 %. Deformation behavior is well understood through comprehensive analysis of fracture surface morphology, side surface characteristics, and tensile-induced substructure evolution. Extensive plastic deformation in the FCC phase is evidenced by pronounced necking, fine shear bands, and high-density dislocation networks. In contrast, the BCC phase displays quasi-cleavage fracture characteristics with limited dislocation activity, indicating restricted plastic deformation capability. The strengthening mechanisms (like mixing rule, interface strengthening and HDI stress strengthening) are discussed in detail. In particular, the investigation of the mechanical properties of FCC and BCC individual phases represents the most significant highlight of this work, which provides critical insights into the strengthening mechanisms of EHEAs.</div></div>","PeriodicalId":385,"journal":{"name":"Materials Science and Engineering: A","volume":"939 ","pages":"Article 148524"},"PeriodicalIF":6.1,"publicationDate":"2025-05-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144099110","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 pre-deoxygenation treatment on the properties of BNi-7 brazing filler metals and its brazed joints","authors":"Cao Lili ,&nbsp;Feng Cunjiabei ,&nbsp;Li Guangya ,&nbsp;Zheng Yuanyuan ,&nbsp;Liu Zhuo ,&nbsp;Zhu Bangweng ,&nbsp;Long Weimin","doi":"10.1016/j.msea.2025.148521","DOIUrl":"10.1016/j.msea.2025.148521","url":null,"abstract":"<div><div>The oxidation that occurs during the production and storage of brazing filler metals serves as the primary cause of metallurgical defects in the brazed joints. To investigate the role of oxygen concentration in the coupling relationship between the microstructure and mechanical properties of both the filler metal and the brazed joint, this study implemented a TiH₂ precursor pre-deoxygenation process on gas-atomized BNi-7 brazing alloy. The oxygen concentration exhibited a characteristic parabolic variation with increasing pre-deoxygenation temperature, reaching a minimum value of 0.060 wt % at 500 °C and 23.08 % reduction compared to the original powder. At the optimized oxygen content of 0.060 wt %, the liquidus temperature of the brazing alloy significantly decreased to 890 °C, with a narrowed melting range of 6.2 °C. The microstructure of the brazed joints displayed typical eutectic morphology characteristics, which consist of a continuously distributed Cr/Fe-enriched Ni solid solution matrix; a Cr-segregated Ni₃P-Ni(Cr) intermetallic compound in the central region and discretely distributed Ni(Cr, Fe)-P metastable phases. Under optimal oxygen conditions (0.06 wt %), the maximum shear strength reached 57 MPa, reflecting a 15 % strength improvement over the baseline group. The results indicate that oxygen reduction effectively suppresses heterogeneous nucleation processes and enhances metallurgical homogenization.</div></div>","PeriodicalId":385,"journal":{"name":"Materials Science and Engineering: A","volume":"939 ","pages":"Article 148521"},"PeriodicalIF":6.1,"publicationDate":"2025-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144099013","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":"Microstructural heterogeneities in additively manufactured refractory alloy C103 and their implications for room and elevated temperature mechanical behavior","authors":"Saket Thapliyal ,&nbsp;Julio Ortega-Rojas ,&nbsp;Sebastien Dryepondt ,&nbsp;Brian Jordan ,&nbsp;Christopher Ledford ,&nbsp;Andres Marquez-Rossy ,&nbsp;Michael Kirka","doi":"10.1016/j.msea.2025.148520","DOIUrl":"10.1016/j.msea.2025.148520","url":null,"abstract":"<div><div>Considering the vast component design space enabled by fusion-based additive manufacturing (F-BAM) processes, e.g., directed energy deposition (DED), the scale-up manufacturing of Nb-alloys with F-BAM is advantageous for structural applications. However, varying thermokinetic parameters-induced microstructural heterogeneities are prevalent within the F-BAM processed alloys. Such microstructural heterogeneities can have significant implications for the room and elevated temperature mechanical behavior. While a few studies investigating F-BAM processed alloy C103 are available, none of these studies investigate the microstructural heterogeneities – including those associated with solidification growth modes and second phase particles – and the effect thereof on the mechanical behavior. To this end, we investigate the microstructurally heterogeneous regions with varying solidification growth morphologies, segregation behavior, and second phase particle attributes within the laser-DED processed alloy C103. The implications of such heterogeneous regions for room- and elevated-temperature tensile behavior and damage mechanisms are revealed. Particularly, the interface between the cellular and planar region is identified as susceptible to deformation localization. The implications of hot isostatic pressing (HIP) for the consolidation behavior, microstructural evolution, and resulting mechanical behavior are also discussed. Although the recrystallization and grain growth led to a reduced yield strength in the HIPed condition, the homogenization of microstructure alleviated the deformation localization sites, such as the planar/cellular interface within the melt pool. The homogenized microstructure alongside the enhanced consolidation upon HIP led to an enhanced elongation to failure. Findings establish microstructural design considerations in F-BAM processed Nb alloys and also facilitate design of post-processing heat treatments for achieving improved mechanical properties.</div></div>","PeriodicalId":385,"journal":{"name":"Materials Science and Engineering: A","volume":"940 ","pages":"Article 148520"},"PeriodicalIF":6.1,"publicationDate":"2025-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144107989","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":"Unveiling the role of Sn in Cu-Zr Alloys: Influence on microstructure evolution and property tuning","authors":"Hao Huang ,&nbsp;Xiyu Zhao ,&nbsp;Jianshi Wu ,&nbsp;Hao Wang ,&nbsp;Yuchen Dou ,&nbsp;Henglei Xu ,&nbsp;Song Niu ,&nbsp;Xiangpeng Xiao ,&nbsp;Mingmao Li ,&nbsp;Jing Zhang ,&nbsp;Shuming Zeng","doi":"10.1016/j.msea.2025.148519","DOIUrl":"10.1016/j.msea.2025.148519","url":null,"abstract":"<div><div>This study comprehensively investigated the influence of Sn addition on the microstructure and properties of Cu-Zr alloys via transmission electron microscopy (TEM), atom probe tomography (APT), along with density functional theory (DFT) calculations. The results indicate that Sn addition reduces the solubility of Zr in the solid-state matrix during solidification, increasing the formation of Zr-rich eutectic particles and refining the grains of the as-cast 0.3Sn-doped alloy. During isochronal aging, the influence of Sn on Zr-rich precipitates varies with temperature. At lower temperatures (300–350 °C), Sn promotes the precipitation of Zr-rich precipitates while at higher temperatures (400–450 °C), Sn accelerates the growth of Zr-rich precipitates. DFT simulations show that Sn atoms preferentially segregate to the Cu side of the Cu/precipitate interfaces, facilitating the formation of core-shell structured precipitates without effectively impeding precipitate growth. Regarding electric conductivity, the difference between the 0.3Sn-doped and Sn-free alloys initially decreases and then increases with rising aging temperature. This is closely related to the change in the total segregation amount of Sn atoms on Zr-rich precipitates, which is associated with the size and numerical density of these precipitates. These findings offer novel insights for the composition design and processing parameter optimization of high-performance Cu alloys with core-shell structured precipitates.</div></div>","PeriodicalId":385,"journal":{"name":"Materials Science and Engineering: A","volume":"939 ","pages":"Article 148519"},"PeriodicalIF":6.1,"publicationDate":"2025-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144099435","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":"Fracture of welded steel samples at normal and low temperatures: Experimental dataset and nonlocal modeling","authors":"A.Yu. Larichkin ,&nbsp;V.S. Klyuchantsev ,&nbsp;E.V. Karpov ,&nbsp;A.G. Malikov ,&nbsp;I.S. Batraev ,&nbsp;I.A. Bataev ,&nbsp;A.A. Filippov ,&nbsp;A.V. Shutov","doi":"10.1016/j.msea.2025.148447","DOIUrl":"10.1016/j.msea.2025.148447","url":null,"abstract":"<div><div>This study combines experimental and theoretical approaches to investigate the deformation and fracture behavior of welded steel samples. The experimental campaign involves systematic variations of key parameters, including testing temperatures and weld inclination angles, to gather a comprehensive dataset. Samples with notches and without notches are included to enhance the dataset’s information content. The raw data is presented in its unprocessed form, suitable for model calibration and validation. As a demonstration example, a nonlocal ductile damage model is calibrated against the experimental data, and the challenges encountered during the calibration process are discussed. The fully calibrated damage model enables detailed end-to-end simulations of damage accumulation, crack initiation, and fracture. As a useful byproduct, the nonlocal damage model allows for the generation of an atlas of possible cracking patterns. The generated atlas includes both experimentally observed and theoretically predicted cracking patterns.</div></div>","PeriodicalId":385,"journal":{"name":"Materials Science and Engineering: A","volume":"939 ","pages":"Article 148447"},"PeriodicalIF":6.1,"publicationDate":"2025-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144099015","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":"Strength-elongation synergy via controlled precipitation hardening in counter pressure cast Al-7Si-0.35 Mg casting alloy with T5 heat treatment","authors":"Saif Haider Kayani ,&nbsp;Tae-Min Koo ,&nbsp;Soo-Bae Kim,&nbsp;Jung-Moo Lee,&nbsp;Kwangjun Euh,&nbsp;Young-Hee Cho","doi":"10.1016/j.msea.2025.148503","DOIUrl":"10.1016/j.msea.2025.148503","url":null,"abstract":"<div><div>Al–7Si–0.35 Mg (A356) is a promising alloy for automotive components and is conventionally strengthened via T6 heat treatment (solution treatment followed by artificial aging). However, solid solution treatment involves high operating costs and introduces casting distortions. Consequently, T5 heat treatment (direct aging after casting) has garnered attention despite its typically lower strength and ductility compared to T6. In this study, we systematically investigated the aging response of a counter pressure cast A356 alloy under various T5 conditions to optimize the trade-off between tensile strength and elongation. Transmission electron microscopy was employed to identify the precipitate phases formed during different T5 treatments and to quantify their size and number density. The results show that increasing the aging temperature from 160 to 210 °C coarsens the precipitates and decreases their number density and coherency, which in turn markedly reduces alloy elongation. This decrease in ductility stems from a deformation mechanism dominated by dislocation bypass of coarse precipitates formed at 210 °C, causing high dislocation densities and localized stress concentrations that initiate micro-cracking. Our findings suggest that the optimal balance between tensile strength and elongation is achieved at 190 °C, where a high number density of fine coherent (β″) precipitates and a small number density of semi-coherent (U2 and B′) precipitates are present. In this case, precipitation shearing becomes the primary deformation mechanism, resulting in moderate dislocation density and a favorable strength-elongation synergy.</div></div>","PeriodicalId":385,"journal":{"name":"Materials Science and Engineering: A","volume":"939 ","pages":"Article 148503"},"PeriodicalIF":6.1,"publicationDate":"2025-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144099436","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}