Materials Characterization最新文献

{"title":"Effects of heat treatment on microstructure, mechanical properties and irradiation response of LPBF GH3535 superalloy","authors":"Zhangjie Sun ,&nbsp;Feida Chen ,&nbsp;Jianjian Li ,&nbsp;Kun Yang ,&nbsp;Xiaobin Tang","doi":"10.1016/j.matchar.2025.115587","DOIUrl":"10.1016/j.matchar.2025.115587","url":null,"abstract":"<div><div>Additive manufacturing (AM) offers a promising approach for the structural optimization of components in next generation advanced reactors. However, AM alloys often struggle to achieve a balanced combination of the mechanical properties and irradiation resistance. In this study, a novel GH3535 superalloy with a theoretical density of 99.996 % was fabricated using laser powder bed fusion (LPBF), followed by a two-step heat treatment consisting of hot isostatic pressing (HIP) and solid solution heat treatment (SSHT). The properties of three types of LPBF GH3535 samples were compared to assess the influence of heat treatment on their microstructure and mechanical properties. Tensile testing revealed that the LPBF-HIP-SSHT sample exhibited superior ductility compared to the LPBF sample, both at room temperature and 700 °C. Nanoindentation tests were conducted to evaluate the irradiation hardening behavior of the alloys. TEM analysis and helium bubble statistical evaluation showed that the LPBF and LPBF-HIP-SSHT samples had similar helium bubble sizes and number densities. When compared to the LPBF-HIP sample, the LPBF-HIP-SSHT GH3535 alloy demonstrated superior helium tolerance and enhanced resistance to irradiation hardening, largely attributed to the presence of a significant amount of nano-carbides. This study offers important insights into the design and optimization of LPBF GH3535 for nuclear industry applications.</div></div>","PeriodicalId":18727,"journal":{"name":"Materials Characterization","volume":"229 ","pages":"Article 115587"},"PeriodicalIF":5.5,"publicationDate":"2025-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145227031","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":"Preparation and characterization of high-strength and thermal shock resistance ZrO2-based ceramic scaffolds via material extrusion","authors":"Jingfei Liu,&nbsp;Li Yang,&nbsp;Zhiyuan Yang,&nbsp;Zizhen Xu,&nbsp;Zitian Fan","doi":"10.1016/j.matchar.2025.115593","DOIUrl":"10.1016/j.matchar.2025.115593","url":null,"abstract":"<div><div>In this study, a method for fabricating ZrO₂-based ceramic scaffolds via material extrusion technique was proposed. 3 mol% Y₂O₃ stabilized ZrO₂ is used as raw material and phenolic resin as the binder. Ceramic scaffolds were fabricated by systematically regulating the rheological properties of ceramic slurry and printing parameters. By collaboratively optimizing the sintering process parameters, the microstructure of the ceramic scaffold was significantly refined and the mechanical properties were greatly improved. The results show that when the filling rate is 50 % and the sintering temperature is 1400 °C, the ceramic scaffold exhibits excellent comprehensive performance: the bulk density reaches 1.25 g·cm⁻³ and the bending strength is 136.45 MPa. In addition, this ceramic scaffold exhibits remarkable thermal shock stability. The residual bending strength ratio typically exceeded 80% after thermal shock testing. It is noteworthy that a distinct whisker-like structure was observed on the sample surface after thermal shock. This study provides theoretical support and technical reserves for the application of high-performance ceramic scaffolds in high-temperature extreme environments such as aerospace.</div></div>","PeriodicalId":18727,"journal":{"name":"Materials Characterization","volume":"229 ","pages":"Article 115593"},"PeriodicalIF":5.5,"publicationDate":"2025-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145227037","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 preparation and mechanism of high-strength-toughness niobium-containing duplex stainless steel: Synergistic annealing-induced TRIP and TWIP effects","authors":"Pengcheng Wang,&nbsp;Lei Liu,&nbsp;Yongxu Gao,&nbsp;Xixiao Liu,&nbsp;Zhengzhi Zhao","doi":"10.1016/j.matchar.2025.115590","DOIUrl":"10.1016/j.matchar.2025.115590","url":null,"abstract":"<div><div>To develop Lean duplex stainless steels (LDSS) with excellent strength-ductility balance and cost-effectiveness, a novel Mn-N-saving niobium-containing LDSS (Fe-0.03C-21Cr-5Mn-0.3 N-0.14Nb) was designed. The microstructural evolution and mechanical properties during annealing after heavy cold rolling were systematically investigated. Optimized annealing yielded an ultimate tensile strength (UTS) of ∼1 GPa and total elongation (TE) of ∼70 %. Mechanistic analysis revealed that this exceptional performance originates from unique phase transformation and recrystallization behaviors. Above the austenite transformation temperature, the martensite→ austenite reverse transformation was dominated by a shear mechanism, accompanied by abnormal thermal expansion along the rolling direction (RD). During annealing, recrystallization exhibited significant phase-dependent differences: Ferrite with high stacking fault energy (SFE) completed recrystallization at 800 °C, while austenite recrystallization was delayed until 850 °C due to suppressed recovery by low SFE. Strain hardening analysis indicated that shear-formed lath austenite contained high-density dislocations, enhancing stability but inhibiting transformation-induced plasticity (TRIP). As annealing temperature increased, austenite underwent recovery and recrystallization, reducing dislocation density and reactivating TRIP, thereby improving work hardening. Crucially, annealing at 950 °C elevated austenite SFE to a critical level, triggering synergistic TRIP and twinning-induced plasticity (TWIP) effects, ultimately imparting outstanding mechanical properties. This study provides new experimental insights and theoretical guidance for designing high-performance lean DSS.</div></div>","PeriodicalId":18727,"journal":{"name":"Materials Characterization","volume":"229 ","pages":"Article 115590"},"PeriodicalIF":5.5,"publicationDate":"2025-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145227038","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":"Decoding the morphological and crystallographic dynamics of Cu6Sn5 in solder interconnects under electromigration","authors":"C. Li ,&nbsp;S.K. Guo ,&nbsp;Z.D. Shen ,&nbsp;Z.X. Guo ,&nbsp;X.C. Lu ,&nbsp;Y.L. Xu ,&nbsp;X.W. Cheng ,&nbsp;Z.L. Ma","doi":"10.1016/j.matchar.2025.115592","DOIUrl":"10.1016/j.matchar.2025.115592","url":null,"abstract":"<div><div>Electromigration (EM) has become the primary failure mode of solder joints due to the miniaturisation of electronic devices. In this study, the EM-induced microstructural evolution of Cu₆Sn₅ intermetallic compounds was investigated by combining experimental characterisation and crystal plasticity finite element simulation. It is revealed that the asymmetric growth (anode) and dissolution (cathode) of interfacial Cu₆Sn₅, the directional evolution of primary Cu₆Sn_5, and the selective formation of bulk Cu₆Sn₅ are driven by directional Cu fluxes, governed by current direction and [001]Sn orientation. Bulk Cu₆Sn₅ appears either flat or protuberant relative to the cross-section. Unlike the randomly oriented protuberant Cu₆Sn₅, flat Cu₆Sn₅ exhibits strong textures and three reproducible orientation relationships (ORs) with βSn, two of which show higher lattice mismatches and lower frequencies of occurrence and were revealed for the first time in this study. The reproducible ORs, rather than [0001]Cu₆Sn₅, are the dominant factors controlling the formation of flat Cu₆Sn₅. However, this influence of ORs diminishes as the angle between [0001]Cu₆Sn₅ and the cross-sectional plane increases. The growth of bulk Cu₆Sn₅ introduces localised stress concentrations, evidenced by the accumulation of geometrically necessary dislocations (GND) at phase boundaries. In particular, the protuberant Cu₆Sn₅ increases the risk of short circuits, thus hindering further miniaturisation of electronic components. This work advances the understanding of the EM failure mechanisms associated with Cu₆Sn₅ evolution and contributes to establishing a crystallography-morphology-reliability framework, which is essential for the design of EM-resistant solder joints in hyper-miniaturised electronics.</div></div>","PeriodicalId":18727,"journal":{"name":"Materials Characterization","volume":"229 ","pages":"Article 115592"},"PeriodicalIF":5.5,"publicationDate":"2025-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145227041","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":"Machine-learning-assisted optimization of constitutive modeling and microstructural insights into the hot deformation of L12-strengthened Co33Cr23Ni34Al5Ti5 chemically complex alloys","authors":"Zhiwei Chen ,&nbsp;Shunli Zhao ,&nbsp;Qi Liu ,&nbsp;Jiafeng Wu ,&nbsp;Chaoyu Xie ,&nbsp;Xiaoliang Han ,&nbsp;Jianhong Gong ,&nbsp;Honggang Sun ,&nbsp;Jichao Qiao ,&nbsp;Weidong Song ,&nbsp;Wenquan Lv ,&nbsp;Ting Wang ,&nbsp;Vladislav Zadorozhnyy ,&nbsp;Parthiban Ramasamy ,&nbsp;Kaikai Song ,&nbsp;Jürgen Eckert","doi":"10.1016/j.matchar.2025.115586","DOIUrl":"10.1016/j.matchar.2025.115586","url":null,"abstract":"<div><div>To tackle the strength-ductility trade-off in chemically complex alloys (CCAs), multi-step thermo-mechanical processing, particularly hot deformation, is a key strategy for optimizing microstructures. Hot deformation controls dynamic recrystallization (DRX) behaviors, enabling the regulation of heterogeneous structures and precipitated phases. This study investigates the influence of temperature and strain rate on the deformation behavior and microstructural evolution of L1₂-strengthened Co₃₃Cr₂₃Ni₃₄Al₅Ti₅ CCAs. The dynamic materials model-derived processing map determines 1313 K and 0.001 s⁻¹ as the optimal processing window, validated by microstructural observations. Moreover, an advanced eXtreme Gradient Boosting (XGBoost)-assisted machine learning (ML) model is developed, demonstrating superior predictive accuracy compared to traditional constitutive models. At low-strain rates, increasing temperature induces the transition from the dominant DRX mechanism to discontinuous DRX (DDRX) to a coupled DDRX and continuous DRX (CDRX) regime. Conversely, higher strain rates at elevated temperatures weaken CDRX. Additionally, the presence of L1₂ nanoprecipitates effectively controls recrystallized grain growth by pinning dislocations and impeding subgrain boundary movement, leading to microstructure refinement. These findings offer critical insights for optimizing thermo-mechanical processing, providing a pathway to design advanced L1₂-strengthened CCAs with tailored microstructures.</div></div>","PeriodicalId":18727,"journal":{"name":"Materials Characterization","volume":"229 ","pages":"Article 115586"},"PeriodicalIF":5.5,"publicationDate":"2025-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145227126","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":"Electro-spheroidization effects on the mechanical property and microstructures in S50C medium‑carbon steels: A comparison with conventional subcritical spheroidization","authors":"Meng-Chun Chiu,&nbsp;Chien-Lung Liang","doi":"10.1016/j.matchar.2025.115591","DOIUrl":"10.1016/j.matchar.2025.115591","url":null,"abstract":"<div><div>This study systematically investigated the microstructure evolution and mechanical softening of normalized S50C medium‑carbon steels subjected to direct current electro-treatment at current densities of 2.75–4.25 × 10³ A/cm² for 1 h. Compared to conventional subcritical spheroidization (700 °C for 24 h), electro-treatment achieved a 24.1 % micro-hardness reduction to 157.8 ± 0.6 HV at a significantly lower processing temperature (268.8 °C) and 96 % shorter duration. Electron backscatter diffraction analyses revealed complete ferrite recrystallization at high current densities, accompanied by grain boundary rearrangement and dislocation annihilation. Concurrently, the cementite morphology evolved from lamellar to spheroidized, with the spheroidization rate increasing from 3.4 ± 0.8 % to 99.5 ± 3.4 %, and the interlamellar spacing of pearlite expanding from 0.37 ± 0.10 μm to 1.45 ± 0.32 μm. These transformations followed a two-stage mechanism: electro-fragmentation at a moderate current density (2.75 × 10³ A/cm²) and Ostwald ripening at higher levels (3.00–4.25 × 10³ A/cm²). A composite Hall-Petch, Bailey-Hirsch, interlamellar spacing based model quantitatively captured the micro-hardness contributions from grain boundary strengthening, strain hardening, and interlamellar cementite strengthening in dual-phased medium‑carbon steels. A thermal benchmark experiment at 269 °C for 1 h confirmed that Joule heating alone could not trigger the observed changes, underscoring the dominant role of athermal effects in metallurgical behaviors. Literature-based thermodynamic analysis further suggests that electro-treatment introduces additional free energy, promoting interface destabilization and accelerated phase transformations. Overall, this method enables effective spheroidization and recrystallization while preventing severe grain growth, offering a low-temperature and high-efficiency alternative for sustainable processing of medium‑carbon steels.</div></div>","PeriodicalId":18727,"journal":{"name":"Materials Characterization","volume":"229 ","pages":"Article 115591"},"PeriodicalIF":5.5,"publicationDate":"2025-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145154456","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":"Elucidating electromigration-induced void failures in Ni/SnAg/Ni solder microbumps using 3D X-ray laminographic inspections","authors":"Shih-Chi Yang ,&nbsp;Chi-Hau Wu ,&nbsp;Kai-Cheng Shie ,&nbsp;King-Ning Tu ,&nbsp;Chih Chen","doi":"10.1016/j.matchar.2025.115589","DOIUrl":"10.1016/j.matchar.2025.115589","url":null,"abstract":"<div><div>This study manifests that high-resolution (0.4 μm) 3D X-ray microscopy can be leveraged for characterizing electromigration-induced (EM-induced) voids in Ni/ SnAg/Ni microbumps non-destructively and effectively. The results of 3D X-ray observations were comparable to those obtained by common destructive approaches. Inspected by consecutive laminographic observations, the voids were likely to shape irregularly and locate randomly. To evaluate the degrees of voiding failures, three levels including slight, medium, and severe were defined based on 3D X-ray observations. Voided microbumps were constantly detected (71 % ∼ 75 %) under high current density as 8× 10⁴ A/cm², whereas they were seldomly observed (33 %) at low current density as 1.6 × 10⁴ A/cm². Moreover, the dependencies of voiding failures on Sn α angles were explicated. The non-voided microbumps had intact Sn in high α angles, while the voided microbumps had residual Sn grains with lower α angles and could vary with different voiding levels.</div></div>","PeriodicalId":18727,"journal":{"name":"Materials Characterization","volume":"229 ","pages":"Article 115589"},"PeriodicalIF":5.5,"publicationDate":"2025-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145154596","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":"Entropy-mediated microstructure engineering of AlxMo0.5NbTa0.5TiZr high-entropy alloy coatings for enhanced mechanical properties","authors":"Zijian Geng ,&nbsp;Zhengfa He ,&nbsp;Jian Peng ,&nbsp;Chuanbin Wang ,&nbsp;Lianmeng Zhang","doi":"10.1016/j.matchar.2025.115583","DOIUrl":"10.1016/j.matchar.2025.115583","url":null,"abstract":"<div><div>The design of amorphous-crystalline heterostructure coatings often involves a complicated and uncertain deposition process. Achieving simple deposition progress of amorphous-crystalline heterostructure is crucial for developing high-performance protective coatings. This study proposes an innovative preparing strategy for amorphous-crystalline heterostructure by alternating mixing entropy of refractory high-entropy (RHEA) alloy coating that enhances the mechanical properties without sacrificing its excellent corrosion resistance. Amorphous-crystalline heterostructure Al_0.5Mo_0.5NbTa_0.5TiZr RHEA coating, composed of an upper crystalline layer and a bottom amorphous layer, was successfully fabricated via one-step magnetron sputtering. The influences of Al content and deposition temperature on the microstructure, mechanical properties, and corrosion resistance were investigated and the underlying mechanism was clarified. The formation of the amorphous-crystalline heterostructure can be attributed to a combined effect of the reduced mixing entropy and increased deposition temperature. Its nano-hardness (H), elastic strain failure strength (H/E), and plastic deformation strength (H³/E²) exceed those of its counterpart, i.e., AlMo_0.5NbTa_0.5TiZr RHEA coating deposited at 500 °C, reaches 11.08 ± 0.30 GPa, 0.070 ± 0.001, 0.054 ± 0.003 GPa, respectively, which are significantly better than traditional refractory metallic coatings and other amorphous RHEA coatings reported in literature. Notably, the E_corr and I_corr of the present amorphous-crystalline heterostructure coating are comparable to those of amorphous Al_0.5-RT and Al₁–500 coatings, indicating that the present amorphous-crystalline heterogeneous structure combines the advantages of both amorphous and crystalline structures, maintaining good mechanical properties while also ensuring excellent corrosion resistance.</div></div>","PeriodicalId":18727,"journal":{"name":"Materials Characterization","volume":"229 ","pages":"Article 115583"},"PeriodicalIF":5.5,"publicationDate":"2025-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145154601","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 evolution of carbon doped Ta-W-Hf alloy by hot forging and annealing","authors":"Run Bai ,&nbsp;Shuang Zhang ,&nbsp;Li Huang ,&nbsp;Hui Liu ,&nbsp;Feng Wang ,&nbsp;Xiaomei Cai ,&nbsp;Mingxing Xia ,&nbsp;Rui Sun ,&nbsp;Hua Wang ,&nbsp;Ping Hu ,&nbsp;Wen Zhang","doi":"10.1016/j.matchar.2025.115588","DOIUrl":"10.1016/j.matchar.2025.115588","url":null,"abstract":"<div><div>Ta-W-Hf based alloys (T-111 and ASTAR-811C) doped with various carbon contents ((0, 0.01 and 0.025 wt%) were fabricated via high-temperature vacuum sintering and electron beam melting, followed by thermal forging and annealing. Effects of carbon content on the microstructural evolution and carbide distributions in Ta-W-Hf based alloys was investigated in this study. Microstructural analysis revealed that carbon doping effectively refined the grain sizes of the as-forged TaWHf-0.025C alloy owing to the precipitation of carbides along grain boundaries. In contrast, the formation of carbides in the as-forged TaWHf-0.01C alloy was not pronounced. It was found that fine Ta₂C particles formed and uniformly distributed in the grains of the TaWHf-0.01C alloy after annealing, whereas the carbides in the TaWHf-0.025C alloy remained predominantly located at grain boundaries. Furthermore, the interface between the Ta matrix and Ta₂C with crystallographic relationships of [001]_matrix∥[1<span><math><mover><mn>1</mn><mo>¯</mo></mover></math></span>01]_Ta₂C and (200)_matrix∥(<span><math><mover><mn>1</mn><mo>¯</mo></mover></math></span>011)Ta₂C was identified， These findings highlight the role of carbon content in tailoring carbide distributions and interfacial coherence, which critically influence the mechanical properties and thermal stability of Ta-W-Hf based alloys.</div></div>","PeriodicalId":18727,"journal":{"name":"Materials Characterization","volume":"229 ","pages":"Article 115588"},"PeriodicalIF":5.5,"publicationDate":"2025-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145154594","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":"Investigation of deformation mechanisms in annealed Al0.35CoCrFeNi complex concentrated alloy by acoustic emission technique during tension","authors":"M. Štamborská ,&nbsp;T. Pelachová ,&nbsp;P. Múčka ,&nbsp;A. Klimová ,&nbsp;I. Petryshynets","doi":"10.1016/j.matchar.2025.115585","DOIUrl":"10.1016/j.matchar.2025.115585","url":null,"abstract":"<div><div>This study investigates the deformation mechanisms of annealed Al_0.35CoCrFeNi complex concentrated alloy using the acoustic emission technique during tensile testing. The microstructure of the alloy consists of equiaxed grains with a size of 500 μm. Three microstructures were examined: a single-phase and two precipitation hardened variants with different type and size of precipitates. After annealing at 700 °C, nanoprecipitates of L1₂ phase and plate-like precipitates with ordered body-centered cubic crystal structure (BCC(B2)) were identified inside the grains. At the grain boundaries BCC(B2) and σ-FeCr particles were observed. During annealing at 900 °C, coarse BCC(B2) precipitates were formed in the alloy. Compared to the single phase microstructure, the measured ultimate tensile strength of precipitation hardened structures formed at 700 °C and 900 °C was higher by 37.4 % and 19.1 %, respectively. The acoustic emission technique was used to track deformation mechanisms of different microstructures during room temperature tensile tests. Acoustic emission measurements show the coexistence of two avalanche mechanisms, dislocation movement and twinning-detwinning, in the studied Al_0.35CoCrFeNi alloy. A strong trend of twin formation was observed by EBSD in the samples annealed at 700 °C, which is consistent with the observation of acoustic emission signals. This research highlights the efficacy of the acoustic emission technique in real-time monitoring and characterization of complex deformation behaviors in advanced alloys.</div></div>","PeriodicalId":18727,"journal":{"name":"Materials Characterization","volume":"229 ","pages":"Article 115585"},"PeriodicalIF":5.5,"publicationDate":"2025-09-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145154603","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}