Materials Science and Engineering: A最新文献

{"title":"Texture evolution and mechanical anisotropy reduction in boron-microalloyed Ti-6Al-4V sheets during cold rolling and annealing","authors":"Ying Han ,&nbsp;Yazheng Wang ,&nbsp;Yun Meng ,&nbsp;Lei Cheng ,&nbsp;Wei Yu ,&nbsp;Xiao Li","doi":"10.1016/j.msea.2025.149703","DOIUrl":"10.1016/j.msea.2025.149703","url":null,"abstract":"<div><div>The control of texture and mechanical anisotropy in rolled titanium sheets remains a critical challenge, as achieving low anisotropy typically requires inefficient cross-rolling. In this study, low-mechanical-anisotropy Ti-6Al-4V microalloyed with 0.04 wt% boron (Ti64–0.04B) sheets were produced by a simplified continuous cold-rolling and annealing process. Quasi-in-situ compression experiments and multiple characterization techniques were employed to investigate the role of TiB in texture evolution of cold-rolled Ti-6Al-4V (Ti64), and to elucidate the underlying mechanisms linking texture to mechanical anisotropy. Results reveal that Ti64 alloy evolves into a transverse (T-type) texture, whereas Ti64–0.04B alloy develops a strong basal (B-type) texture after cold rolling that remains stable upon annealing. TiB particles promote the activation of multiple slip systems dominated by pyramidal slip, while constraining the c-axis rotation of α grains toward the transverse direction (TD), thereby stabilizing the B-type texture and suppressing T-type texture formation. Consequently, the yield strength (YS) difference between the rolling direction (RD) and TD decreases to 38.9 MPa in Ti64–0.04B, significantly lower than 92.4 MPa in Ti64. Texture volume fractions are identified as the key factor governing mechanical anisotropy: a high fraction of B-type texture enhances the Schmid factor symmetry distributions (SFSDs), reducing the property difference between RD and TD and markedly reducing mechanical anisotropy, whereas a high fraction of T-type texture produces the opposite effect.</div></div>","PeriodicalId":385,"journal":{"name":"Materials Science and Engineering: A","volume":"953 ","pages":"Article 149703"},"PeriodicalIF":7.0,"publicationDate":"2026-01-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145922495","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":"Formation quality, microstructure and anisotropic mechanical properties of pure Zn fabricated by laser powder bed fusion","authors":"Chun Chen ,&nbsp;Wenjie Zheng ,&nbsp;Zhenmin Wang ,&nbsp;Runxia Li ,&nbsp;Biao Wang","doi":"10.1016/j.msea.2026.149754","DOIUrl":"10.1016/j.msea.2026.149754","url":null,"abstract":"<div><div>Biodegradable Zn and its alloys fabricated by laser powder bed fusion (LPBF) demonstrate great potential in the field of orthopedic implants. In this study, densified LPBF Zn is obtained by optimizing laser power <em>P</em> and scanning speed <em>v</em>, and the mechanisms behind its anisotropic mechanical properties are revealed. A high relative density (close to 99 %) is achieved with laser energy density <em>E</em>_<em>v</em> = 54.42–95.24 J/mm³. With the increase of <em>E</em>_<em>v</em>, the dominant defect types change from unmelted powder and lack of fusion to keyhole pores. The optimal processing parameters are <em>P</em> = 60 W and <em>v</em> = 500 mm/s. The densified LPBF Zn possesses coarse columnar grains (<span><math><mrow><mover><mi>d</mi><mo>‾</mo></mover></mrow></math></span> = 31.9 ± 45.1 μm) aligned along the build direction (BD) and a <span><math><mrow><mrow><mo>⟨</mo><mn>0001</mn><mo>⟩</mo></mrow><mo>∥</mo><mtext>BD</mtext></mrow></math></span> texture. Its compressive yield strength along <em>z</em> direction (83.5 ± 0.6 MPa) is lower than that along <em>x</em> direction (109.8 ± 1.3 MPa). The <span><math><mrow><mrow><mo>⟨</mo><mn>0001</mn><mo>⟩</mo></mrow><mo>∥</mo><mtext>BD</mtext></mrow></math></span> texture and polarity of <span><math><mrow><mrow><mo>{</mo><mrow><mn>10</mn><mover><mn>1</mn><mo>‾</mo></mover><mn>2</mn></mrow><mo>}</mo></mrow><mrow><mo>⟨</mo><mrow><mn>10</mn><mover><mn>1</mn><mo>‾</mo></mover><mover><mn>1</mn><mo>‾</mo></mover></mrow><mo>⟩</mo></mrow></mrow></math></span> twinning result in the significantly higher twin area fraction for compression along <em>z</em> direction. The pronounced twining activity lowers the strength along this direction, thereby leading to anisotropy of mechanical properties. This mechanism is validated by further visco-plastic self-consistent simulation. After yielding, grain refinement and crystallographic reorientation induced by twinning contribute to the higher strain hardening rate for compression along <em>z</em> direction. Continuous dynamic recrystallization (CDRX), discontinuous dynamic recrystallization (DDRX) and twin-induced dynamic recrystallization (TDRX) occur in room-temperature compression. CDRX is dominant for both compressive directions. TDRX is promoted for compression along <em>z</em> direction owing to the higher twinning activity. The occurrence of DRX reduces the strain hardening rate, thereby narrowing the gap of strength at the late stage of deformation. The findings provide valuable insights into the formation process and anisotropic mechanical properties of LPBF Zn.</div></div>","PeriodicalId":385,"journal":{"name":"Materials Science and Engineering: A","volume":"953 ","pages":"Article 149754"},"PeriodicalIF":7.0,"publicationDate":"2026-01-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145973588","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":"Impact of oxidation-assisted nano-carbide precipitation on the very high cycle fatigue crack growth in a nickel-based alloy","authors":"Xiangyu Wang ,&nbsp;Chao He ,&nbsp;Yajun Dai ,&nbsp;Yongjie Liu ,&nbsp;Chong Wang ,&nbsp;Qingyuan Wang","doi":"10.1016/j.msea.2025.149695","DOIUrl":"10.1016/j.msea.2025.149695","url":null,"abstract":"<div><div>In this study, the crack growth behavior of a Ni-based superalloy under very-high-cycle fatigue (VHCF) conditions was systematically investigated at 950 °C in air, with particular emphasis on the mechanism of oxidation-assisted fatigue crack growth. Experimental results revealed that oxidation along the crack surface significantly altered the local distribution of alloying elements, resulting in the formation of Al-depleted zones. Within these zones, a high density of nano-scale MC-type carbides precipitated, which promotes micro-void nucleation under cyclic loading and thereby accelerates crack propagation. Electron channeling contrast imaging (ECCI) and atomic-resolution scanning transmission electron microscopy (STEM) analyses indicate that the formation of these nano-carbides was closely associated with specific defect configurations and the local segregation of heavy solute atoms during high-temperature fatigue loading. These nano-carbides maintained a cube-on-cube orientation relationship with the matrix, but introduced a substantial lattice misfit of approximately 21.6 % at the interface, providing favorable sites for micro-void formation. This study established a new mechanism in which oxidation-assisted nano-carbide precipitation governs the VHCF crack growth behavior of Ni-based superalloys at elevated temperatures.</div></div>","PeriodicalId":385,"journal":{"name":"Materials Science and Engineering: A","volume":"953 ","pages":"Article 149695"},"PeriodicalIF":7.0,"publicationDate":"2026-01-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145973524","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 brazed thermal bridge of continuous Mo-network for extreme heat transfer between Cf/C composite to Haynes 230 alloy","authors":"Pengpeng Xue,&nbsp;Xiaoqing Si,&nbsp;Wenjing Ding,&nbsp;Wendi Zhao,&nbsp;Jianwei Gao,&nbsp;Yaotian Yan,&nbsp;Chun Li,&nbsp;Bo Yang,&nbsp;Junlei Qi,&nbsp;Jian Cao","doi":"10.1016/j.msea.2026.149755","DOIUrl":"10.1016/j.msea.2026.149755","url":null,"abstract":"<div><div>The pursuit of efficient thermal management under extreme environments—as encountered in thermonuclear fusion reactors—is fundamentally hampered by the formidable challenge of creating robust and conductive joints between dissimilar high-temperature materials, such as C_f/C composite and Haynes 230 alloy. Here, we devise a multi-layered Mo-Cu/Cu/Ti (MCT) filler that, upon brazing, in-situ constructs a continuous, three-dimensional molybdenum network within the joint. It serves as a dedicated thermal superhighway, effectively bypassing the intrinsic phonon-scattering interfaces that typically plague conventional brazing seam. The resulting joint exhibits an exceptional thermal conductivity of 36.1–40.7 W m⁻¹ K⁻¹ and a low overall thermal resistance below 1.8 cm² K W⁻¹ in the 600–900 °C range. Concurrently, the joint maintains a shear strength of &gt;9 MPa even at the upper service temperature of 900 °C. Crucially, the joint survives 100 aggressive thermal cycles (200 h) between 600 and 900 °C with negligible degradation in both thermal and mechanical properties, demonstrating unparalleled reliability for long-term service. In a practical demonstration under a high heat flux of 2.7 W mm⁻², the brazed assembly enhances the surface temperature by 13 °C relative to a non-joined interface, unequivocally validating its superior heat-transfer capability in a simulated service scenario. This work provides a viable strategy for thermal management in fusion reactors and aerospace thermal protection systems, overcoming the temperature limitations of conventional thermal interface materials.</div></div>","PeriodicalId":385,"journal":{"name":"Materials Science and Engineering: A","volume":"953 ","pages":"Article 149755"},"PeriodicalIF":7.0,"publicationDate":"2026-01-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145922510","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":"Influence of rolling and equal channel angular pressing (ECAP) on the microstructural evolution and mechanical properties of Zn-0.5Li-0.3Mn alloy","authors":"Muhammad Atif ,&nbsp;Huan Liu ,&nbsp;Jiajian Zhou ,&nbsp;Yinyuan Chen ,&nbsp;Xiaoyu Qin ,&nbsp;Zaib Ullah Khan ,&nbsp;Chao Sun ,&nbsp;Xianli Wang ,&nbsp;Jia Ju ,&nbsp;Yuna Wu","doi":"10.1016/j.msea.2026.149757","DOIUrl":"10.1016/j.msea.2026.149757","url":null,"abstract":"<div><div>Zinc alloys are promising candidates for biodegradable medical implants, yet their limited mechanical performance remains a barrier to broader clinical application. The Zn-Li-Mn alloy system has significant potential for enhancing strength and ductility. In this work, the grain size evolution and resulting mechanical properties of a Zn-0.5Li-0.3Mn alloy, were examined following hot rolling at 50 %, 60 %, and 70 % reduction and equal-channel angular pressing at 250 °C for 1, 4, and 8 passes. Rolling produced slightly coarser grain sizes of 16.5, 17.25, and 18.96 μm, which contributed to a progressive increase in strength with deformation. The 70 % rolled sample achieved an ultimate tensile strength (UTS) of 323.5 ± 4.5 MPa and a yield strength (YS) of 258.9 ± 2.0 MPa, while the 50 % rolled alloy exhibited the highest elongation (EL) of 78.2 ± 8.1 %. Furthermore, ECAP processing resulted in substantial grain refinement, reducing the grain size from 42.3 μm to 3.15 μm and promoting corresponding improvements in mechanical performance. The best strength-ductility combination was obtained after 4 passes, yielding a UTS of 327.9 ± 8.1 MPa, YS of 245.9 ± 7.4 MPa, and EL of 54.4 ± 3.2 %. The microstructural results indicate that grain-boundary strengthening contributes significantly to the mechanical properties of the rolled samples, with additional hetero-deformation-induced (HDI) strengthening particularly evident in the 70 % alloy. While, the primary strengthening mechanism in the ECAP-processed samples is grain-boundary strengthening. According to the results obtained, both rolling and ECAP can markedly enhance mechanical performance of Zn-0.5Li-0.3Mn alloys for next-generation biodegradable implant applications.</div></div>","PeriodicalId":385,"journal":{"name":"Materials Science and Engineering: A","volume":"953 ","pages":"Article 149757"},"PeriodicalIF":7.0,"publicationDate":"2026-01-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145922915","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":"Study on the microalloying effect and strengthening mechanism of Lu substituting for Sc in Al-Mg alloys","authors":"Yaoyao Ma ,&nbsp;Zhimeng Tang ,&nbsp;Jian Li ,&nbsp;Hong He ,&nbsp;Guozhong He ,&nbsp;Wei Feng ,&nbsp;Jing Li ,&nbsp;Xianquan Jiang","doi":"10.1016/j.msea.2026.149760","DOIUrl":"10.1016/j.msea.2026.149760","url":null,"abstract":"<div><div>Al-Mg alloys have gained extensive utilization in marine and automotive applications owing to their exceptional corrosion resistance and formability. Nevertheless, the inherent compromise between mechanical strength and corrosion performance restricts their deployment in more demanding service environments. The present study successfully designed and fabricated a novel Al-Mg-Lu alloy, systematically elucidating the incorporation behavior and underlying mechanisms of Lu within the Al-Mg matrix through integrated thermodynamic modeling and multi-scale microstructural analysis. Experimental results demonstrate that the incorporation of Lu leads to the formation of thermodynamically stable Al₃Lu nano-precipitates uniformly distributed in the aluminum matrix. These precipitates effectively inhibit the continuous grain-boundary precipitation of <em>β</em>-Al₃Mg₂ phases while concurrently refining the alloy's grain structure, reducing the average grain size from 171.55 μm to 120.69 μm. Remarkably, at an Lu concentration of 0.3 wt%, the alloy achieves optimal comprehensive performance: the yield strength attains 158 MPa, corresponding to a 33.9 % enhancement compared to the unmodified base alloy; the fracture elongation reaches 24.5 %, representing an 84.2 % improvement; simultaneously, the susceptibility to intergranular corrosion is markedly mitigated, as evidenced by an 80 % reduction in mass loss. When benchmarked against conventional Al-Mg-Sc alloys, the newly developed Al-Mg-Lu variants maintain comparable strength characteristics while demonstrating superior plastic deformation capability, enhanced corrosion resistance, and substantial cost-effectiveness. This study not only confirms that Lu can serve as an efficient substitute for Sc but also reveals its unique microalloying mechanism, offering a novel solution for developing high-performance, low-cost commercial aluminum alloys.</div></div>","PeriodicalId":385,"journal":{"name":"Materials Science and Engineering: A","volume":"953 ","pages":"Article 149760"},"PeriodicalIF":7.0,"publicationDate":"2026-01-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146023443","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":"Tensile response at dynamic strain rates in fine-grained Mg and Mg binary alloys","authors":"Hidetoshi Somekawa ,&nbsp;Alok Singh","doi":"10.1016/j.msea.2026.149745","DOIUrl":"10.1016/j.msea.2026.149745","url":null,"abstract":"<div><div>The dynamic plastic response and deformation behavior at high strain rate regimes is examined on Mg and various dilute binary Mg alloys with fine-grained structure. Nine types of solute atoms (Ag, Al, Ga, In, Li, Mn, Sn, Y and Zn) are selected for alloying in Mg binary alloys with a chemical content of 0.3 at.%. Flow stress and ductility are affected by alloying elements and strain rates. Previous studies have provided that fine-grained Mg and Mg-Mn alloy exhibit huge ductility at low and quasi-static strain rates, attributable to the contribution of grain boundary sliding partially. However, the tensile ductility is determined to be between 5 % and 20 % at present strain rates of 1/s to 1000/s. In addition, regardless of the alloying elements, the strain rate sensitivities at high strain rate regimes are determined to be approximately 0.01–0.05, suggesting dislocation glide as the major deformation mechanism. Microstructural observations reveal &lt;c&gt; and/or &lt;c+a&gt; dislocation slips, as well as basal dislocation slips, instead of deformation twin formations.</div></div>","PeriodicalId":385,"journal":{"name":"Materials Science and Engineering: A","volume":"953 ","pages":"Article 149745"},"PeriodicalIF":7.0,"publicationDate":"2026-01-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145973516","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":"Data-driven assisted design of highly stable and superhard high-entropy diborides","authors":"Yuxue Ren ,&nbsp;Qianqian Wang ,&nbsp;Zhilin Han ,&nbsp;Ji-Xuan Liu ,&nbsp;Yutong Fan ,&nbsp;Congju Zuo ,&nbsp;Guangquan Yue ,&nbsp;Xingwei Zheng ,&nbsp;Yongcheng Liang ,&nbsp;Guo-Jun Zhang","doi":"10.1016/j.msea.2026.149749","DOIUrl":"10.1016/j.msea.2026.149749","url":null,"abstract":"<div><div>The multi-component nature of high-entropy diboride (HEB) ceramics poses challenges to traditional trial-and-error design methods, including difficulties in regulating phase stability and prolonged optimization cycles. This study therefore selected multivariate linear regression and random forest models from seven machine learning models (ML) to predict the formation energy (<span><math><mrow><msub><mi>E</mi><mtext>form</mtext></msub></mrow></math></span>) and thermodynamic parameter Ω of HEBs, and applied the Ω<em>-δ</em> criterion (where <em>δ</em> represents atomic size mismatch) to evaluate single-phase formability across 70 HEBs. For hardness prediction, the Gradient Boosting Decision Tree model demonstrated superior performance. Interpretable ML analysis indicated a positive correlation between hardness and the weighted average electronegativity, suggesting its enhancement effect on hardness. Guided by model predictions, (Cr_0.2Zr_0.2Hf_0.2Ta_0.2W_0.2)B₂ and (V_0.2Zr_0.2Nb_0.2Ta_0.2W_0.2)B₂ ceramics were selected for synthesis based on their high predicted hardness under a 1.96 N load. The former exhibited a single-phase microstructure, which is consistent with the predicted phase stability. Experimentally measured hardness values for both samples under various loads showed less than 5 % relative error compared to model predictions, confirming the accuracy of the model for these two samples. Under a load of 0.49 N, the Vickers hardnesses of these two new superhard HEBs were 46.08 <span><math><mrow><mo>±</mo></mrow></math></span> 1.20 GPa and 44.85<span><math><mrow><mo>±</mo></mrow></math></span> 2.38 GPa, respectively. This work establishes a data-driven ML framework for designing high-performance HEB ceramics, offering an efficient pathway for accelerating materials development.</div></div>","PeriodicalId":385,"journal":{"name":"Materials Science and Engineering: A","volume":"953 ","pages":"Article 149749"},"PeriodicalIF":7.0,"publicationDate":"2026-01-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145922912","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":"Substrate surface finish-dependent strength evolution and reliability of ultrasonic bonded power module terminal joints","authors":"Dong-Bok Lee ,&nbsp;Kwan-Soo Lim ,&nbsp;Hyojin Park ,&nbsp;Ji-Hyung Lee ,&nbsp;Semin Park ,&nbsp;Chul-Min Oh ,&nbsp;Jeong-Won Yoon","doi":"10.1016/j.msea.2026.149751","DOIUrl":"10.1016/j.msea.2026.149751","url":null,"abstract":"<div><div>Terminals in electric-vehicle (EV) power modules are critical components responsible for delivering high voltage and current; therefore, ensuring the electrical performance and long-term reliability of their joints is essential. As reliability degradation under high-temperature environments has become a major concern, ultrasonic bonding—which allows rapid joining without filler materials or flux while maintaining excellent thermal stability—has emerged as a promising alternative. In this study, Cu terminals were bonded to active metal brazed (AMB) substrates with Cu, electroless Ag, and electroless nickel-immersion gold (ENIG) surface finishes using both reflow soldering and ultrasonic bonding. Reflow soldering was employed as a reference joining process to benchmark the high-temperature reliability of ultrasonic bonded joints. The joint reliability was evaluated under thermal aging at 150 °C for up to 1008 h. For reflow soldered joints, the shear strength progressively decreased with increasing thermal aging time across all substrate types. In contrast, ultrasonic bonded joints—except those on bare Cu—exhibited increased bonding strength during thermal aging while maintaining stable performance. Specifically, Ag- and ENIG-based ultrasonic joints showed an increase in shear strength from approximately 76–77 MPa to 86–88 MPa and sustained this level up to 1008 h. Furthermore, the strengthening mechanisms responsible for this reliability enhancement were elucidated. These findings demonstrate that ultrasonic bonding is a highly promising joining technology for next-generation SiC- and GaN-based power modules that demand high thermal stability.</div></div>","PeriodicalId":385,"journal":{"name":"Materials Science and Engineering: A","volume":"953 ","pages":"Article 149751"},"PeriodicalIF":7.0,"publicationDate":"2026-01-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145922977","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":"The effects of Ni on the microstructure and fracture behaviour of ferritic-pearlitic ductile iron under fatigue","authors":"Obey Suleyman,&nbsp;Fiona Sillars,&nbsp;Tiziana Marrocco","doi":"10.1016/j.msea.2026.149725","DOIUrl":"10.1016/j.msea.2026.149725","url":null,"abstract":"<div><div>This study investigated the effects of nickel (Ni) on the microstructure and fracture behaviour of ferritic-pearlitic ductile iron (DI) under fatigue. It was found that the presence of Ni had effects on both the matrix and graphite nodules. In the matrix, it increased the volume fraction of pearlite. On the graphite nodules, it decreased their number and increased their size by lowering the eutectic temperature, which enabled extended growth time. When a ferritisation heat treatment was carried out, the presence of Ni produced a finer ferrite grain size, attributed to its impact on nucleation temperature. When a normalisation treatment was carried out, the presence of Ni reduced the pearlite interlamellar spacing, leading to increased hardness, yield and tensile strength, and decreased ductility. Fatigue testing indicated that failure occurred at lower cycle counts in the presence of Ni, due to promoting brittleness and defect agglomeration in pearlitic regions. Fractography was carried out on the fracture surfaces of the failed specimens and highlighted the presence of macro shrinkage porosity and carbide clusters as dominant cause for crack initiation. By segregating within the pearlitic regions, Ni was found to have a strengthening effect but also to increase the susceptibility to defect formation, thus reducing the fatigue performance.</div></div>","PeriodicalId":385,"journal":{"name":"Materials Science and Engineering: A","volume":"953 ","pages":"Article 149725"},"PeriodicalIF":7.0,"publicationDate":"2026-01-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145973587","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}