Materials Characterization最新文献_第5页

Nickel-induced transition of deformation mechanisms in high-Mn lightweight steels: Insights into dislocation behavior and planar fault evolution 高锰轻钢中镍诱导的变形转变机制：位错行为和平面断层演化的见解

IF 5.5 2区材料科学

Materials Characterization Pub Date : 2025-09-21 DOI: 10.1016/j.matchar.2025.115574

Saikat Shyamal, Chunyu Dong, Jiapeng Zheng, Cheenepalli Nagarjuna, Wenjun Lu, Binbin He

{"title":"Nickel-induced transition of deformation mechanisms in high-Mn lightweight steels: Insights into dislocation behavior and planar fault evolution","authors":"Saikat Shyamal, Chunyu Dong, Jiapeng Zheng, Cheenepalli Nagarjuna, Wenjun Lu, Binbin He","doi":"10.1016/j.matchar.2025.115574","DOIUrl":"10.1016/j.matchar.2025.115574","url":null,"abstract":"<div><div>Pursuing lightweight, high-strength alloys for sustainable automotive and aerospace applications has catalyzed significant interest in high-Mn steels, where alloying elements such as nickel (Ni) play a pivotal role in tailoring deformation mechanisms to optimize mechanical performance. In this study, we explore the influence of Ni content (0, 2.5, and 5 at.%) on the deformation mechanisms of high-Mn lightweight steels using a combination of X-ray line profile analysis (XLPA) and transmission electron microscopy (TEM). Despite a constant stacking fault energy (SFE) of approximately 90 mJ/m<sup>2</sup> across all compositions, our findings reveal a marked increase in dislocation density (2.75 to 9.56 × 10<sup>15</sup> m<sup>−2</sup>) and stacking fault probability (3.3 to 6.3 × 10<sup>−4</sup>) with higher Ni concentrations, leading to a notable transition in deformation mechanism. From slip refinement-induced plasticity (SRIP) to microband-induced plasticity (MBIP) and ultimately to planar fault-mediated mechanisms, the role of Ni is demonstrated to enhance dislocation interactions and promote the nucleation of B2 precipitates, which significantly influence plasticity. At 5Ni, synergy among deformation twins, B2 precipitates, and correlated dislocations yields exceptional strength-ductility synergy (1126 MPa UTS, 49 % elongation). This study establishes a direct correlation between Ni content and deformation mechanism, offering a transformative perspective on the design of high-SFE lightweight alloys with tunable deformation mechanism, beyond conventional SFE-driven paradigms.</div></div>","PeriodicalId":18727,"journal":{"name":"Materials Characterization","volume":"229 ","pages":"Article 115574"},"PeriodicalIF":5.5,"publicationDate":"2025-09-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145118413","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}

引用次数: 0

Classification-guided two-stage segmentation of multi-feature M-A islands in bainitic steels 贝氏体钢多特征M-A岛的分类引导两阶段分割

IF 5.5 2区材料科学

Materials Characterization Pub Date : 2025-09-19 DOI: 10.1016/j.matchar.2025.115576

Xun Zhou , Peng Zhang , Yanmin Jin , Ning Liu , Xianqiao Wang , Keke Tang

{"title":"Classification-guided two-stage segmentation of multi-feature M-A islands in bainitic steels","authors":"Xun Zhou , Peng Zhang , Yanmin Jin , Ning Liu , Xianqiao Wang , Keke Tang","doi":"10.1016/j.matchar.2025.115576","DOIUrl":"10.1016/j.matchar.2025.115576","url":null,"abstract":"<div><div>The precise segmentation of multi-feature martensite–austenite (M–A) islands in bainitic steels is essential for understanding the microstructure–property relationships. However, current methods face challenges due to the complex morphology and interdependencies of features. This study proposes a classification-guided two-stage framework to address these issues, where the first stage employs classification to identify and categorize M–A islands, and the second stage performs segmentation using customized CBAM-enhanced U-Net models to accurately delineate their boundaries and capture detailed morphological features. Initially, a classification model categorizes M–A islands into distinct morphological types—elongated, blocky, and irregularly aggregated, providing essential prior knowledge for subsequent segmentation. Based on these classifications, customized segmentation models are developed for each type, optimized to enhance boundary accuracy and handle class imbalances. The results demonstrate superior segmentation performance across the different M–A island types, with average IoU values of 65.5 %, 88.0 %, and 81.5 % for elongated, blocky, and irregularly aggregated M–A islands, respectively. The proposed framework outperforms hybrid-model approaches while reducing reliance on large labeled datasets. In addition, a systematic evaluation of data increments demonstrates that the classification-guided strategy can achieve high accuracy with fewer annotations. Cross-material validation further confirms the strong generalization capability of the framework, underscoring its potential for broader applications in microstructural analysis. Overall, this study establishes a morphology-aware approach that enables precise and efficient microstructure classification and segmentation, while elucidating critical structure-property relationships governing fatigue-fracture resistance optimization in advanced steel systems.</div></div>","PeriodicalId":18727,"journal":{"name":"Materials Characterization","volume":"229 ","pages":"Article 115576"},"PeriodicalIF":5.5,"publicationDate":"2025-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145154605","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}

引用次数: 0

Effect of overheating on the strength of single crystal superalloy DD6: Mechanism, simulation and prediction 过热对单晶高温合金DD6强度的影响：机理、模拟与预测

IF 5.5 2区材料科学

Materials Characterization Pub Date : 2025-09-19 DOI: 10.1016/j.matchar.2025.115577

Dongxing Pan , Xiaogang Wang , Ruoyao Cui , Chao Jiang , Xiaoming Shan , Dong Mi , Zhicheng Liu

{"title":"Effect of overheating on the strength of single crystal superalloy DD6: Mechanism, simulation and prediction","authors":"Dongxing Pan , Xiaogang Wang , Ruoyao Cui , Chao Jiang , Xiaoming Shan , Dong Mi , Zhicheng Liu","doi":"10.1016/j.matchar.2025.115577","DOIUrl":"10.1016/j.matchar.2025.115577","url":null,"abstract":"<div><div>Aero-engines may face the risk of One-Engine-Inoperative (OEI) during service, which typically leads to overheating lasting tens of seconds. This very short overheating process may have a significant impact on the mechanical properties of the material used in safety-critical components of aero-engines, such as turbine blades. This paper aims to understand the effect of overheating on the yield strength of nickel-based single crystal superalloy DD6 through a comprehensive investigation. A first surprising experimental finding is that the overheating under some typical OEI conditions may increase rather than decrease the yield strength of the DD6 superalloy. And the highest increase can reach 20 % to 30 %. The underlying micromechanical mechanisms supporting this counterintuitive finding are revealed in this work. It shows that the overheating enables directional coarsening of the primary γ' precipitates and simultaneous precipitation of the finer secondary γ' precipitates, which thereby imposes a complex impact on hindering dislocation behavior. In particular, the secondary γ' precipitation plays an important role in this deformation mechanism. This is supported by molecular dynamics simulation conducted at the atomic scale. Finally, a yield strength prediction model that enables taking into account the overheating effect is proposed. The experimental verification shows that the proposed model enables predicting the yield strength of DD6 alloy after experiencing a given OEI, with an acceptable error level of less than 5 %.</div></div>","PeriodicalId":18727,"journal":{"name":"Materials Characterization","volume":"229 ","pages":"Article 115577"},"PeriodicalIF":5.5,"publicationDate":"2025-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145154602","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}

引用次数: 0

Cascading texture evolution driven by dynamic competition of deformation mechanisms in Inconel 625 Ni-based superalloy prepared by laser powder bed fusion 激光粉末床熔合制备Inconel 625镍基高温合金中变形机制动态竞争驱动的级联织构演化

IF 5.5 2区材料科学

Materials Characterization Pub Date : 2025-09-19 DOI: 10.1016/j.matchar.2025.115582

Xingqun Zhang , Jian Tu , Tingzhou He , Qiyuan Zhang , Yanxiang Liang

引用次数: 0

Role of nano-HfC addition in enhancing oxidation resistance and modifying scale evolution in Inconel 625 添加纳米hfc对Inconel 625增强抗氧化性和改变结垢演化的作用

IF 5.5 2区材料科学

Materials Characterization Pub Date : 2025-09-19 DOI: 10.1016/j.matchar.2025.115579

Jiangling Luo , Runhua Li , Chong Wang , Xianhang Huang , Xiao Ma , Xiaodong Zou , Shijun Xie , Mingxuan Cao , Huijun Li , Linlin Pan

{"title":"Role of nano-HfC addition in enhancing oxidation resistance and modifying scale evolution in Inconel 625","authors":"Jiangling Luo , Runhua Li , Chong Wang , Xianhang Huang , Xiao Ma , Xiaodong Zou , Shijun Xie , Mingxuan Cao , Huijun Li , Linlin Pan","doi":"10.1016/j.matchar.2025.115579","DOIUrl":"10.1016/j.matchar.2025.115579","url":null,"abstract":"<div><div>Inconel 625 alloys are widely utilized in high-temperature applications due to their excellent mechanical properties and corrosion resistance; however, their oxidation resistance remains insufficient for more demanding environments. This study addresses this limitation by incorporating nano-sized hafnium carbide (nano-HfC) particles into Inconel 625 (IN625) coatings to enhance their high-temperature oxidation performance. The coatings were fabricated and subjected to isothermal oxidation tests at 900 °C, 1000 °C, and 1100 °C. Performance evaluation reveals that the IN625/HfC coatings exhibit markedly lower oxidation mass gains compared to IN625, with reductions of 33–40 %, along with a decrease in the parabolic rate constant (<em>k</em><sub>p</sub>) of approximately 56–65 %, indicating a significant improvement in oxidation resistance. Introducing nano-HfC significantly refines the grain structure, promotes chromium diffusion, and facilitates the in-situ formation of HfO<sub>2</sub> nanoparticles, which serve as effective nucleation sites for Cr<sub>2</sub>O<sub>3</sub> and diffusion barriers against oxygen ingress. Mechanistic analysis reveals that incorporating nano-HfC alters the dominant oxidation mechanism from outward cation diffusion to inward oxygen diffusion, thereby transforming the residual stress state from tensile to compressive. This modification enhances oxide scale adhesion and suppresses spallation. This work provides new insights into microstructural engineering strategies for significantly improving the oxidation resistance and long-term service stability of Inconel 625.</div></div>","PeriodicalId":18727,"journal":{"name":"Materials Characterization","volume":"229 ","pages":"Article 115579"},"PeriodicalIF":5.5,"publicationDate":"2025-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145118416","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}

引用次数: 0

Boron-induced suppression of recrystallization during creep in FeNi-based superalloy 硼对镍基高温合金蠕变过程中再结晶的抑制作用

IF 5.5 2区材料科学

Materials Characterization Pub Date : 2025-09-19 DOI: 10.1016/j.matchar.2025.115580

Cham Il Kim , Ji Yeong Lee , Won Tae Kim , Eun Soo Park , Heon Kang , Do Hyang Kim

{"title":"Boron-induced suppression of recrystallization during creep in FeNi-based superalloy","authors":"Cham Il Kim , Ji Yeong Lee , Won Tae Kim , Eun Soo Park , Heon Kang , Do Hyang Kim","doi":"10.1016/j.matchar.2025.115580","DOIUrl":"10.1016/j.matchar.2025.115580","url":null,"abstract":"<div><div>This study investigates the effects of boron on microstructural evolution and creep properties in a FeNi-base superalloy, showing that boron plays a role in significant enhancement of the creep resistance by suppression of recrystallization during creep. Detailed analyses using transmission electron microscopy, atom probe tomography, and electron backscattered diffraction revealed that boron segregates at grain boundaries and at the interface between the matrix and the precipitate, thereby increasing grain boundary cohesion and suppressing dynamic recrystallization. Moreover, boron stabilizes the grain structure by increasing the recrystallization threshold, thus inhibiting recrystallization during creep. The effect of boron in strengthening the grain boundary is particularly pronounced in the creep test with lower strain rate, where it effectively extends the creep rupture life, while this effect is less emphasized in the high temperature tensile test with higher strain rate. These findings suggest that the addition of boron is crucial for the optimization of the high-temperature performance of FeNi-base superalloys.</div></div>","PeriodicalId":18727,"journal":{"name":"Materials Characterization","volume":"229 ","pages":"Article 115580"},"PeriodicalIF":5.5,"publicationDate":"2025-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145154597","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}

引用次数: 0

Outstanding dynamic tensile response of pure Mg and diluted MgMn alloy under very high strain rates 纯Mg和稀释MgMn合金在非常高应变速率下的动态拉伸响应

IF 5.5 2区材料科学

Materials Characterization Pub Date : 2025-09-19 DOI: 10.1016/j.matchar.2025.115578

Abdul Malik

{"title":"Outstanding dynamic tensile response of pure Mg and diluted MgMn alloy under very high strain rates","authors":"Abdul Malik","doi":"10.1016/j.matchar.2025.115578","DOIUrl":"10.1016/j.matchar.2025.115578","url":null,"abstract":"<div><div>Hetero deformation induced (HDI) and bi-modal grain structure induced (BI) hardening are effective ways to increase the performance of magnesium (Mg) alloys. However, loading rate, texture, and microstructure features play a decisive role in achieving the full advantage of these mechanisms. In particular, we reported that the heterogeneous grain structured Mg<img>Mn alloy and bimodal grain structured pure Mg, having low strength and low elongation to fracture (EF) under quasi-static (QS) loading, can show exceptionally high strength and high EF under high strain rate (HSR) loading. To prove it, we have conducted QS (<span><math><mover><mi>ε</mi><mo>̇</mo></mover><mo>=</mo><mn>0.001</mn><mspace></mspace><msup><mi>s</mi><mrow><mo>−</mo><mn>1</mn></mrow></msup></math></span>) and HSR (<span><math><mover><mi>ε</mi><mo>̇</mo></mover><mo>=</mo><mn>2400</mn><mo>−</mo><mn>4200</mn><mspace></mspace><msup><mi>s</mi><mrow><mo>−</mo><mn>1</mn></mrow></msup></math></span>) tensile properties of a bi-modal grain structure extruded Mg and a heterogeneous grain structure extruded Mg<img>Mn alloy having different textures. Subsequently, the ultimate tensile strength (UTS) ∼ 334 MPa is achieved for Mg under HSR loading, which is 110 % higher than the UTS (∼ 159 MPa) under QS loading. Likewise, the Mg<img>Mn alloy also displayed an exceptional UTS of ∼382 MPa, which is ∼105 % higher than the UTS (∼ 185 MPa) of the Mg<img>Mn alloy under QS loading. Most specifically, EF is 2-fold and ∼ 3–4 fold in Mg and Mg<img>Mn alloy under HSR compared to the QS loading. The results also revealed that Mg displayed structure instability, and Mg<img>Mn alloy displayed structure stability. Therefore, Mg<img>Mn alloy displayed a higher UTS ∼ 81 MPa than that of Mg under the same HSR (4100 and 4182 s<sup>−1</sup>). Thus, the maximum advantage of the HDI and BI mechanisms is attained at HSR loading, and the Mg and Mg<img>Mn alloy that were not high strength and ductile under QS loading are high strength and ductile under HSR tensile loading.</div></div>","PeriodicalId":18727,"journal":{"name":"Materials Characterization","volume":"229 ","pages":"Article 115578"},"PeriodicalIF":5.5,"publicationDate":"2025-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145118415","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}

引用次数: 0

Dynamic compression behavior of TC11 alloy fabricated by electron beam powder bed fusion and heat treatment 电子束粉末床熔合及热处理TC11合金的动态压缩行为

IF 5.5 2区材料科学

Materials Characterization Pub Date : 2025-09-19 DOI: 10.1016/j.matchar.2025.115575

Wendi Wu , Shun Guo , Haiying Xu , Zhisheng Zhang , Yilei Shi , Xinghua Sang , Bo Yang , Zhuang Wang , Yong Peng , Qi Zhou , Kehong Wang

{"title":"Dynamic compression behavior of TC11 alloy fabricated by electron beam powder bed fusion and heat treatment","authors":"Wendi Wu , Shun Guo , Haiying Xu , Zhisheng Zhang , Yilei Shi , Xinghua Sang , Bo Yang , Zhuang Wang , Yong Peng , Qi Zhou , Kehong Wang","doi":"10.1016/j.matchar.2025.115575","DOIUrl":"10.1016/j.matchar.2025.115575","url":null,"abstract":"<div><div>This study investigates the dynamic deformation behavior and microstructural evolution of TC11 titanium alloy fabricated by electron beam powder bed fusion (EB-PBF), which remains insufficiently understood compared with conventionally processed alloys. EB-PBF samples were subjected to solution-aging treatments at different temperatures, and their phase composition, microstructure, and dynamic compression properties were systematically investigated. The as-deposited alloy exhibits lamellar α and intergranular β phases with a strong Burgers orientation relationship, while heat treatment at 1000 °C induces the precipitation of fine acicular α' laths. Dynamic compression testing reveals that dislocation accumulation, grain rotation, and <span><math><mfenced><mrow><mn>10</mn><mover><mn>1</mn><mo>¯</mo></mover><mn>2</mn></mrow></mfenced><mo><</mo><mover><mn>1</mn><mo>¯</mo></mover><mn>011</mn><mo>></mo></math></span> tensile twins dominate the deformation process, whereas severe shear promotes adiabatic shear band (ASB) formation, followed by microvoid nucleation and crack propagation. The basketweave structure exhibits weakened texture and a broader SF distribution compared with α colony. These results provide new insights into how distinct microstructural morphologies govern the high strain rate deformation mechanisms of EB-PBF titanium alloys.</div></div>","PeriodicalId":18727,"journal":{"name":"Materials Characterization","volume":"229 ","pages":"Article 115575"},"PeriodicalIF":5.5,"publicationDate":"2025-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145118505","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}

引用次数: 0

Preferential formation of screw dislocations within the α phase after the grain/interface boundary emission during elevated temperature dwell of an aero-grade Ti-6Al-4V alloy 航空级Ti-6Al-4V合金在高温驻留过程中，晶粒/界面边界发射后α相内优先形成螺位错

IF 5.5 2区材料科学

Materials Characterization Pub Date : 2025-09-19 DOI: 10.1016/j.matchar.2025.115581

Pavel Cizek , Nicholas Armstrong , Sitarama R. Kada , Jun Wang , Ross A. Antoniou , Peter A. Lynch

{"title":"Preferential formation of screw dislocations within the α phase after the grain/interface boundary emission during elevated temperature dwell of an aero-grade Ti-6Al-4V alloy","authors":"Pavel Cizek , Nicholas Armstrong , Sitarama R. Kada , Jun Wang , Ross A. Antoniou , Peter A. Lynch","doi":"10.1016/j.matchar.2025.115581","DOIUrl":"10.1016/j.matchar.2025.115581","url":null,"abstract":"<div><div>The current work examines the dislocation emission arrays within the α phase of a Ti-6Al-4V alloy, subjected to short-duration dwell performed in tension at about 96 % of the yield stress at a temperature of 300 °C. The arrays formed through dislocation emission from the α/α grain boundaries and α/β interfaces were examined post-mortem using transmission electron microscopy. As expected, the above grain/interface boundaries proved to be the major dislocation sources during the applied dwell loading. There was a systematic tendency to preferentially generate screw dislocations either through progressive altering the dislocation lines after emission or via direct emission. In the former case, after achieving the screw character, the dislocations tended to cross slip out of the emission planes. Screw dislocations were directly emitted as sequentially formed, expanding dislocation loops exhibiting long straight screw-type segments parallel to the migration direction. The dislocation emission character appeared to be governed by the local conditions around the emission sites. The observed planes of dislocation emission arrays, together with the corresponding Burgers vectors, revealed the operation of prismatic as well as 1st and 2nd order pyramidal <a> glide, and the Schmid factor values were closely followed. Some emission planes were irrational, and dislocations seemed to be able to cross slip from these planes to the high Schmid factor glide planes. The current results provide direct evidence of the evolution of dislocation structures during dwell loading at elevated temperatures and will contribute to better understanding of the reported thermal alleviation of dwell fatigue in titanium alloys.</div></div>","PeriodicalId":18727,"journal":{"name":"Materials Characterization","volume":"229 ","pages":"Article 115581"},"PeriodicalIF":5.5,"publicationDate":"2025-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145154598","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}

引用次数: 0

Microstructure and mechanical properties of parts produced by laser powder bed fusion of AlSi10Mg powder with coarse particle size 粗粒度AlSi10Mg粉末激光粉末床熔接零件的组织与力学性能

IF 5.5 2区材料科学

Materials Characterization Pub Date : 2025-09-18 DOI: 10.1016/j.matchar.2025.115573

F.N. Depboylu , O.V. Mishin , T. Leissner , A.A. Popa

{"title":"Microstructure and mechanical properties of parts produced by laser powder bed fusion of AlSi10Mg powder with coarse particle size","authors":"F.N. Depboylu , O.V. Mishin , T. Leissner , A.A. Popa","doi":"10.1016/j.matchar.2025.115573","DOIUrl":"10.1016/j.matchar.2025.115573","url":null,"abstract":"<div><div>Powder size and morphology play a central role in laser powder bed fusion of metallic components, influencing the process stability, microstructure, and mechanical properties. In the pursuit of more efficient production, coarse powders (∼90 μm and greater) have become commercially available, enabling increased layer thickness and build rate. For AlSi10Mg, only limited data exist on how such coarse powders perform during additive manufacturing in medium-wattage (400 W) systems and on what microstructures and mechanical properties can be achieved in parts 3D-printed using these powders. The present study addresses this gap by characterizing parts produced using NExP-1 AlSi10Mg, a novel non-combustible and non-explosible powder with uniform spherical morphology and a median size of ∼90 μm. The microstructure and tensile properties have been assessed in samples manufactured using three distinct combinations of process parameters, resulting in relative densities of 97.5–99.6 % (measured using Archimedes' principle). Results obtained in this study show that an increased hatch distance at a low scan speed significantly reduces the relative density due to lack-of-fusion porosity, which leads to decreased strength and ductility compared to those in a sample with the highest density. The pore population characterized using micro-computed tomography is found to be related to sample density: the highest-density sample primarily contains isolated pores, whereas lower-density samples display higher frequences of interconnected pores. This work provides new insights into the potential of coarse AlSi10Mg powders and serves as the basis for further process optimization for demanding industrial applications.</div></div>","PeriodicalId":18727,"journal":{"name":"Materials Characterization","volume":"229 ","pages":"Article 115573"},"PeriodicalIF":5.5,"publicationDate":"2025-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145118417","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}

引用次数: 0