Materials Science and Engineering: A最新文献

{"title":"Strengthening and toughening of developed high-strength hull structural steel and its heat-affected zones","authors":"Deng-Bang Gao ,&nbsp;Xuan-Wei Lei ,&nbsp;Hai-Tao Jian ,&nbsp;Chun-Long Jiang ,&nbsp;Zhi Cheng ,&nbsp;Ji-Hua Huang","doi":"10.1016/j.msea.2026.149793","DOIUrl":"10.1016/j.msea.2026.149793","url":null,"abstract":"<div><div>A high-strength hull structural (HSHS) steel was developed based on a low-carbon high-nickel design concept. To evaluate its mechanical properties and weldability, the microstructures and mechanical performance of both the base metal and its heat-affected zones (HAZs)—including the coarse-grained HAZ, fine-grained HAZ, unaltered coarse-grained HAZ, and supercritically reheated coarse-grained HAZ—were systematically investigated under heat inputs of 20 and 50 kJ/cm. The strengthening and toughening mechanisms of the HSHS steel and its HAZs were further elucidated. The results demonstrate that the developed HSHS steel exhibits excellent comprehensive mechanical properties, while its HAZs maintain sufficiently high strength and overall satisfactory toughness at 223 K (−50 °C). The high strength of the developed HSHS steel is primarily attributed to the second phase precipitation and the formation of a tempered bainite-dominated microstructure. In the HAZs, the designed Nb content and the development of a lath-based microstructure are identified as key factors ensuring high strength. The low-temperature toughness of both the base metal and HAZs is predominantly governed by the high Ni content and refined M-A constituents, with secondary contributions from finer effective grain size and microstructural characteristics. Depending on specific conditions, these factors lead to variations in Charpy impact energy. Notably, a comparative analysis with documented data reveals that the mechanical properties of the HAZs in the developed HSHS steel are comparable to those of HSLA-100 steels. Collectively, these findings confirm that the developed HSHS steel possesses good weldability.</div></div>","PeriodicalId":385,"journal":{"name":"Materials Science and Engineering: A","volume":"954 ","pages":"Article 149793"},"PeriodicalIF":7.0,"publicationDate":"2026-01-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146037422","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":"Synergistic strength and ductility enhancement of lightweight AlTiVCr eutectic high entropy alloys with controlled Al/Ti atomic ratios","authors":"Dong Seong Hong ,&nbsp;Sung Hwan Hong ,&nbsp;Yu Jin Lee ,&nbsp;Ga Eun Jo ,&nbsp;Dilshodbek Yusupov ,&nbsp;Muhammad Aoun Abbas ,&nbsp;Gyeol Chan Kang ,&nbsp;Hae Jin Park ,&nbsp;Jürgen Eckert ,&nbsp;Kiran P. Shinde ,&nbsp;Ki Buem Kim","doi":"10.1016/j.msea.2026.149817","DOIUrl":"10.1016/j.msea.2026.149817","url":null,"abstract":"<div><div>Eutectic high entropy alloys (EHEAs) based on the AlTiVCr system offer a promising combination of high strength and ductility, making them attractive for advanced structural applications. In the present work, a simple and effective strategy of varying two constituent elements Al and Ti was proposed to design EHEA. Al_xTi_80-xV₁₅Cr₅ (x = 35, 40, 45 at.%) alloy compositions were prepared by arc suction casting. The Al₃₅Ti₄₅V₁₅Cr₅ alloy exhibited a single B2 phase structure. With increasing Al content, the microstructure of Al₄₀Ti₄₀V₁₅Cr₅ evolved to a dual-phase structure composed of a high amount of B2 matrix with locally distributed HCP phase, and the Al₄₅Ti₃₅V₁₅Cr₅ alloy formed as a eutectic structure consisting of B2 and HCP phases. The Al₄₅Ti₃₅V₁₅Cr₅ EHEA composition demonstrates a high yield strength of 1864 MPa and excellent compressive ductility of 14.3 %, attributed to the suppression of shear band propagation at the phase boundaries, and it exhibited a low density of 3.97 g/cm³, leading to a superior specific strength of 469.22 MPa cm³/g. The stable intermetallic-based eutectic microstructures were achieved by tuning the composition in accordance with the strong negative mixing enthalpy between Al and Ti. The formation of a eutectic dual-phase microstructure consisting of B2 and HCP phases significantly enhances the mechanical performance. These findings give a new pathway for designing lightweight, high-performance eutectic high entropy alloys.</div></div>","PeriodicalId":385,"journal":{"name":"Materials Science and Engineering: A","volume":"954 ","pages":"Article 149817"},"PeriodicalIF":7.0,"publicationDate":"2026-01-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146037424","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 serrated grain boundaries on mechanical anisotropy in L-PBF fabricated GH4099 alloy","authors":"Ruihang Xu ,&nbsp;Shuya Zhang ,&nbsp;Haiou Yang ,&nbsp;Chunwen Guo ,&nbsp;Hongliang Zhao ,&nbsp;Yuheng Fan ,&nbsp;Xianglei Dong","doi":"10.1016/j.msea.2026.149815","DOIUrl":"10.1016/j.msea.2026.149815","url":null,"abstract":"<div><div>Nickel-based superalloy GH4099 fabricated via laser powder bed fusion (L-PBF) inevitably develops pronounced microstructural anisotropy and columnar grains aligned with the build direction due to rapid solidification and steep thermal gradients, which compromises structural stability and reliability in service. To address this, we propose and validate a reproducible heat-treatment window (slow cooling followed by aging) that induces stable serrated grain boundaries (SGB) in L-PBF-built GH4099. Compared with the as-deposited (AD) and conventional solution treated and aged (STA) states, the SGB condition yields equiaxed grains with pronounced boundary undulations and uniformly dispersed M₂₃C₆ along boundaries, while preserving a fine and consistent intragranular γ′ population (∼20–21 nm). Texture intensity decreased from 4.60 to 3.06, suggesting a reduction in plastic anisotropy. Quantitatively, boundary curvature increases from 0.099 μm⁻¹ to 0.128 μm⁻¹ (vertical direction), and the SGB-H attains a superior strength–ductility balance with YS of 797.1 MPa, UTS of 1227.1 MPa, and elongation of 44.8 %, compared with AD-H (YS 588 MPa, UTS 989 MPa, elongation 47.8 %). Cyclic loading–unloading analysis shows that SGB-H presents a smaller hysteresis loop area at cycle 9, dropping from 9.114 to 7.337 kJ/m³ compared with STA-H. The back stress is reduced by roughly 60–73 MPa and the friction stress by about 100 MPa, resulting in a σ_b/σ_flow ratio of 0.48–0.53 rather than above 0.56. These data indicate SGB effectively disperses GND pile-ups and lowers local interfacial friction, improving deformation compatibility and cyclic stability.</div></div>","PeriodicalId":385,"journal":{"name":"Materials Science and Engineering: A","volume":"955 ","pages":"Article 149815"},"PeriodicalIF":7.0,"publicationDate":"2026-01-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146171679","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":"Engineered ωiso phase enable deformation-induced mechanisms strength and plasticity synergy in a novel Ti-531 metastable β titanium alloy","authors":"Irfan Ali Abro ,&nbsp;Lin Yang ,&nbsp;Qunbo Fan ,&nbsp;Kamal Mustafa","doi":"10.1016/j.msea.2026.149806","DOIUrl":"10.1016/j.msea.2026.149806","url":null,"abstract":"<div><div>Metastable β-Ti alloys are known for their high strain hardening rates and excellent plasticity through the combined effects of transformation induced plasticity (TRIP) and twinning induced plasticity (TWIP) effects, yet their relatively low yield strength restrict structural applications. Improving yield strength without sacrificing ductility is thus a key challenge in these alloys. To address this long-standing strength-plasticity dilemma, we designed a novel metastable β-Ti alloy, Ti-5Mo-3Cr-1Zr (Ti-531), guided by d-electron theory, average electron-to-atom ratio <span><math><mrow><mo>(</mo><mover><mrow><mi>e</mi><mo>/</mo><mi>a</mi></mrow><mo>‾</mo></mover><mo>)</mo></mrow></math></span> and atomic radius difference <span><math><mrow><mo>(</mo><mover><mrow><mo>Δ</mo><mi>r</mi></mrow><mo>‾</mo></mover><mo>)</mo></mrow></math></span> criteria. By engineering nanoscale <span><math><mrow><msub><mi>ω</mi><mtext>iso</mtext></msub></mrow></math></span> phase precipitations, a strategy is demonstrated to concurrently strengthen the yield response and preserve high ductility in the Ti-531 alloy. The results show that these <span><math><mrow><msub><mi>ω</mi><mtext>iso</mtext></msub></mrow></math></span> particles substantially strengthen the alloy and activate a synergistic deformation-induced strengthening mechanism. This mechanism involves a sandwich-type composite twin/stress-induced <span><math><mrow><mi>ω</mi></mrow></math></span> <span><math><mrow><mo>(</mo><msub><mtext>SI</mtext><mi>ω</mi></msub><mo>)</mo></mrow></math></span> structures, interactions between twin/SIM (α”), and development of dislocation channels largely devoid of <span><math><mrow><msub><mi>ω</mi><mtext>iso</mtext></msub></mrow></math></span> phase synergistically accommodate localized strain. These dislocation channels facilitate to accelerate dislocation accumulation, promote forest hardening and suppress the impeding effect of <span><math><mrow><msub><mi>ω</mi><mtext>iso</mtext></msub></mrow></math></span> phase. As a result, the alloy aged at 423 K (A423) outperforms the hot-rolled solution-treated alloy (R1123) in yield strength (∼642 MPa, ∼28 % higher) with merely a slight (∼1.1 %) reduction in elongation, thus combining high strength with largely preserved ductility. This work introduces instability-control paradigm that harmonizes twin/ <span><math><mrow><msub><mtext>SI</mtext><mi>ω</mi></msub></mrow></math></span>/SIM-assisted deformation and dislocation channels strengthening to engineer high performance metastable β-Ti alloys.</div></div>","PeriodicalId":385,"journal":{"name":"Materials Science and Engineering: A","volume":"954 ","pages":"Article 149806"},"PeriodicalIF":7.0,"publicationDate":"2026-01-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146006806","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":"Design strategy for enhancing mechanical properties and magnetocaloric effect of eutectic Ni-Mn-Sn-Fe alloy via laser powder bed fusion","authors":"Rongzhi Li ,&nbsp;Peter K. Liaw ,&nbsp;Jianzhong Jiang ,&nbsp;Lin Deng ,&nbsp;Yong Zhang","doi":"10.1016/j.msea.2026.149795","DOIUrl":"10.1016/j.msea.2026.149795","url":null,"abstract":"<div><div>Environmental concerns from conventional refrigerants highlight the urgent need for solid-state cooling materials that combine structural robustness with strong magnetocaloric performance. Here, we design a dual-phase Ni₅₀Mn₃₂Sn₁₀Fe₈ Heusler alloy using Fe alloying in conjunction with optimized laser powder bed fusion (L-PBF) and homogenization annealing. The resulting ultrafine eutectic structure (∼650 nm lamellar spacing) with semi-coherent Kurdjumov–Sachs interfaces effectively integrates mechanical strength and functional performance. The alloy exhibits high compressive strength (1692.8 MPa), good ductility (10.5 %), and a stable modulus (∼113 GPa) with ∼1.4 % recoverable superelastic strain after 50 cycles. Functionally, it achieves a magnetic entropy change of 10.04 J kg⁻¹ K⁻¹ and a refrigerant capacity of 184 J/kg under a 5 T magnetic field. This work establishes a composition–processing design strategy for multifunctional magnetocaloric materials, providing a pathway toward robust, high-performance alloys for solid-state cooling, flexible actuators, and biomedical devices.</div></div>","PeriodicalId":385,"journal":{"name":"Materials Science and Engineering: A","volume":"954 ","pages":"Article 149795"},"PeriodicalIF":7.0,"publicationDate":"2026-01-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146006807","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":"Heterogeneous deformation and strengthening mechanism in TC4 coaxial laser wire-based directed energy deposition for repairing Ti80","authors":"Xiaohong Zhan ,&nbsp;Jinsheng Ji ,&nbsp;Chaoqi Qi ,&nbsp;Xiong Zhang ,&nbsp;Deliang Lei ,&nbsp;Jianfeng Wang","doi":"10.1016/j.msea.2026.149800","DOIUrl":"10.1016/j.msea.2026.149800","url":null,"abstract":"<div><div>Laser additive manufacturing technology holds great potential for repairing titanium alloys. In this study, coaxial laser wire-based directed energy deposition (CLW-DED) using TC4 alloy was first applied to repair forged Ti80 alloy, with a focus on investigating the regional microstructural variations and synergistic deformation behavior of the repaired specimens. Additionally, the strengthening effects of dual annealing treatments were explored. The results revealed that the microstructure of the repaired specimens transitioned from fine α′ martensite in the repaired zone to the equiaxed α phase in the substrate. Heat treatment induced martensite decomposition and facilitated element diffusion, contributing to the stabilization of the microstructure. The repaired sample demonstrated superior strength to the substrate material with substantially reduced plasticity. The mismatch in strength and ductility was primarily attributed to strain concentration and differences in strain hardening rates at the interface between the repaired layer and the substrate. Dislocation slip served as the primary deformation mechanism, while twinning was activated as a secondary deformation mechanism in the repaired layer. Heat treatment enhanced the tensile strength of the specimens to ∼982 MPa and improved ductility to ∼5.2 % by reducing dislocation density and promoting dislocation slip. This study confirms the feasibility of CLW-DED for titanium alloy repair and provides theoretical insights into the mechanical performance of the heterostructured metallic components.</div></div>","PeriodicalId":385,"journal":{"name":"Materials Science and Engineering: A","volume":"953 ","pages":"Article 149800"},"PeriodicalIF":7.0,"publicationDate":"2026-01-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146023555","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, texture evolution and mechanical properties of Mg-4Y-2Nd-2Sm-0.5Zr alloy under different hot extrusion ratios","authors":"Zheng Wu ,&nbsp;Xiaoya Chen ,&nbsp;Jian Zeng ,&nbsp;Kang Yao ,&nbsp;Dongzhen Wang ,&nbsp;Quanan Li","doi":"10.1016/j.msea.2026.149810","DOIUrl":"10.1016/j.msea.2026.149810","url":null,"abstract":"<div><div>Achieving a significant enhancement in the mechanical properties of Mg-Y-RE (WE) alloys is critical for broadening their application prospects. This study systematically examines and discusses the dynamic recrystallization (DRX) and dislocation behavior of WE alloys under different extrusion ratios. Examination of the microstructure of the extruded alloys reveals that varying hot extrusion ratios influence recrystallization behavior, with grain refinement being highly correlated with particle stimulated nucleation (PSN) and continuous/discontinuous dynamic recrystallization (CDRX/DDRX) mechanisms. Furthermore, an increase in the extrusion ratio enhances dynamic precipitation, thereby promoting the formation of fine and uniform precipitates. At an extrusion ratio of 9.4, the yield strength (YS) reaches 312 MPa and the elongation (EL) improves to 11.1 %. The observed enhancements can be primarily linked to the processes of grain refinement and the activation of pyramidal slip. This approach allows for a deeper comprehension of the intricate interplay between microstructural characteristics and the mechanical properties inherent to Mg alloys. Moreover, it serves as a significant reference point for the industrial manufacturing of high-performance extruded Mg-Y series alloys, optimizing their overall performance in practical applications.</div></div>","PeriodicalId":385,"journal":{"name":"Materials Science and Engineering: A","volume":"953 ","pages":"Article 149810"},"PeriodicalIF":7.0,"publicationDate":"2026-01-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146023553","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":"Temperature-dependent deformation mechanisms and strengthening behavior of a novel Ni-based superalloy with bimodal γ′ precipitate distribution","authors":"Xinyu Meng ,&nbsp;Chao Tang ,&nbsp;Shaomin Lyu ,&nbsp;Xingfei Xie ,&nbsp;Jian Jia ,&nbsp;Jinglong Qu","doi":"10.1016/j.msea.2026.149784","DOIUrl":"10.1016/j.msea.2026.149784","url":null,"abstract":"<div><div>High-temperature tensile performance is a critical indicator of the mechanical reliability of Ni-based superalloys. In this study, a newly designed Ni-based superalloy was systematically investigated from room temperature to 900 °C to elucidate the coupling between microstructural characteristics, mechanical response, and deformation mechanisms. Fine-grained (10.7 μm) and coarse-grained (97 μm) microstructures were obtained through multi-stage heat treatments. The FG alloy exhibits superior yield and tensile strength below 750 °C, reaching 1340 MPa and 1740 MPa at room temperature and retaining 1208 MPa and 1267 MPa at 750 °C, which is primarily attributed to its higher grain boundary density and enhanced grain-boundary-mediated strengthening. However, the FG alloy shows a pronounced ductility drop at 815 °C, with the elongation decreasing to 9 %. In contrast, the CG alloy demonstrates enhanced strength retention at elevated temperatures, maintaining an ultimate tensile strength and yield strength of 801 MPa and 770 MPa at 900 °C, corresponding to a tensile strength retention of 54 % (compared with 38 % for the FG alloy), together with a stable elongation of 8.5 %. This superior high-temperature stability is associated with a lower grain boundary density and a higher fraction of Σ3 special boundaries (42.6–55.9 %). Microstructural analysis reveals a bimodal γ′ precipitate distribution in both microstructures, with fine secondary γ′ precipitates (FG: 82 nm, 48 %; CG: 92 nm, 57 %) dominating strengthening through short-range dislocation–precipitate interactions, and coarse primary γ′ precipitates (FG: 1.54 μm, 7.6 %; CG: 3.19 μm, 0.5 %) facilitating deformation accommodation by pinning grain boundary migration, thereby enabling a synergistic balance between strength and ductility over a wide temperature range. Transmission electron microscopy and critical resolved shear stress analysis demonstrate a temperature-dependent transition in deformation mechanisms from γ′ shearing to Orowan looping in the range of 815–900 °C. In addition, Co/Ti solute segregation at twin interfaces reduces interfacial energy and suppresses defect migration, further stabilizing the γ/γ′ microstructure and enhancing high-temperature strength. These findings provide mechanistic insight for the microstructural design of advanced Ni-based superalloys.</div></div>","PeriodicalId":385,"journal":{"name":"Materials Science and Engineering: A","volume":"953 ","pages":"Article 149784"},"PeriodicalIF":7.0,"publicationDate":"2026-01-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146023554","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":"Modulated precipitation of dispersoids and strength-ductility synergy via multi-step pre-treatments in an Al-Mg-Mn-Fe-Zr-Cr-Si alloy","authors":"Ziyan Hu ,&nbsp;Feng Qian ,&nbsp;Jinyue Li ,&nbsp;Chunan Li ,&nbsp;Zijian Wang ,&nbsp;Yang Li ,&nbsp;Chun Guo ,&nbsp;Shiwei Pan ,&nbsp;Xingwang Cheng","doi":"10.1016/j.msea.2026.149809","DOIUrl":"10.1016/j.msea.2026.149809","url":null,"abstract":"<div><div>Conventional 5xxx Al-Mg alloys are typically non-heat-treatable, with their strength limited by solid solution and work hardening. Dispersion strengthening is a potent strategy to overcome this limitation, but its effectiveness is often hindered by the sluggish and insufficient precipitation of thermally stable dispersoids. To promote dispersion kinetics, this work introduced a multi-step pre-treatment, integrating pre-aging (PA, 300 °C/8 h) and pre-straining (PS, 10 % cold rolling), in a novel Al-Mg-Mn-Fe-Zr-Cr-Si alloy. This PA + PS protocol constructed a unique composite microstructure, featuring Mn-rich solute clusters, β-Mg₂Si nanoparticles and a high density of dislocations. Upon subsequent aging at 400 °C, the dislocation networks strongly interacted with β-Mg₂Si to cooperatively facilitate the heterogeneous nucleation of Mn-rich dispersoids, while the residual Mn-rich solute clusters in Al-matrix progressively transformed into dispersoids. This dual precipitation pathway effectively accelerated the aging kinetics and enhanced the spatial uniformity of dispersoids, thus drastically minimizing dispersoid-free zones (DFZs). Consequently, samples subjected to PA + PS exhibited a superior strength-ductility synergy after aging at 400 °C for 12 h, with yield strength, ultimate strength and elongation increased by 34 %, 40 % and 23 % over the as-cast counterpart. Furthermore, it demonstrated exceptional thermal stability, with negligible loss of strength even after prolonged 400 °C aging until 200 h, overwhelming the PS pre-treated and as-cast samples. This work establishes a transformative dispersion-strengthening paradigm mediated by the synergy of pre-aging and pre-straining, providing foundational insights for developing advanced, thermally stable 5xxx alloys with high strength-ductility synergy.</div></div>","PeriodicalId":385,"journal":{"name":"Materials Science and Engineering: A","volume":"953 ","pages":"Article 149809"},"PeriodicalIF":7.0,"publicationDate":"2026-01-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146023557","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":"Simultaneous enhancement of strength and ductility in Al-Cu-Li alloys with a moderate Cu/Li ratio via minor pre-deformation","authors":"Fengjiao Niu ,&nbsp;Haiyang Liu ,&nbsp;Ruyu Cheng ,&nbsp;Haoran Yang ,&nbsp;Yixuan Hao ,&nbsp;XiuBo Yang ,&nbsp;Yajie Guo","doi":"10.1016/j.msea.2026.149807","DOIUrl":"10.1016/j.msea.2026.149807","url":null,"abstract":"<div><div>The microstructure evolution and mechanical properties of a new Al-3.2Cu-0.9Li-0.4 Mg (wt.%) alloy with a moderate Cu/Li ratio of 3.5:1 under T8 treatment (incorporating 6 % pre-deformation followed by artificial aging) were systematically investigated. Compared to the T6 condition (direct artificial aging), the T8-treated alloy achieved a simultaneous enhancement in strength and elongation. Quantitative analysis of strengthening mechanisms reveals that precipitation strengthening provides the dominant contribution, which is significantly enhanced in the T8 state due to a refined and homogeneous distribution of T₁ (Al₂CuLi) and δ′/θ'/δ′ (Al₂Cu/Al₃Li/Al₂Cu) composite phases, promoted by the high-density dislocations from pre-deformation. This pre-deformation also facilitates the morphological transition of S phase (Al₂CuMg) from rod-like to lath-like and substantially narrows the grain boundary precipitate-free zones (PFZs) from 324 nm to 50 nm. The strengthening calculations further confirm the auxiliary roles of grain boundary and dislocation strengthening, while the contribution from solid solution strengthening remains comparable between the T6 and T8 states. These microstructural optimizations enhance intragranular strength and alleviate grain boundary brittleness, ultimately resulting in a 16 % increase in yield strength, a 12 % increase in tensile strength, and a 15 % improvement in elongation.</div></div>","PeriodicalId":385,"journal":{"name":"Materials Science and Engineering: A","volume":"953 ","pages":"Article 149807"},"PeriodicalIF":7.0,"publicationDate":"2026-01-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146023556","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}