Materials Characterization最新文献_第5页

Strain partitioning characterization of advanced high strength steels using in-situ tensile tests with Micro digital image correlation – Methodology and analysis 利用微数字图像相关性原位拉伸试验表征先进高强度钢的应变分区--方法与分析

IF 4.8 2区材料科学

Materials Characterization Pub Date : 2024-10-12 DOI: 10.1016/j.matchar.2024.114451

{"title":"Strain partitioning characterization of advanced high strength steels using in-situ tensile tests with Micro digital image correlation – Methodology and analysis","authors":"","doi":"10.1016/j.matchar.2024.114451","DOIUrl":"10.1016/j.matchar.2024.114451","url":null,"abstract":"<div><div>This research investigates experimental methods used to extract and quantify meso-scale strain partitioning of five different advanced high strength steels (AHSS), using <em>in-situ</em> uniaxial tensile testing within a SEM. A slightly notched uniaxial tensile specimen was developed to ensure that localisation (necking) occurred in the middle of the specimen where SEM images of the deformed microstructures were captured. Micro digital image correlation (μDIC) was conducted using the etched microstructure up to high nominal strain of ∼0.5 within the neck. The effect of step size, subset size and SEM magnification were investigated to produce the highest resolution strain distribution contours. The strain distribution throughout the microstructure was extracted from 10,000× magnification micrographs and a method was developed to quantify the average strain partitioning for every level of nominal strain imposed during the tensile test. The high strength differential between ferrite and martensite grains within two dual-phase steels (DP800, DP980GI), resulted in a high level of average strain partitioning that increased linearly with respect to the applied nominal strain. The three-phase (martensite-bainite-ferrite) CP980 steel had a similar (to DP) level of strain partitioning at low nominal strains, but as deformation within the neck increased, the rate of strain partitioning decreased due to the presence of the moderate strength bainite grains. Single-phase MS1500 (martensite) and TWIP (retained austenite) exhibited low average strain partitioning levels due the single-phase and large grain size microstructures of these materials. The average strain partitioning ratio was shown to be ∼1 for the dual-phase steels, and reduced to 0.45 for the highest ductility TWIP material.</div></div>","PeriodicalId":18727,"journal":{"name":"Materials Characterization","volume":null,"pages":null},"PeriodicalIF":4.8,"publicationDate":"2024-10-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142526502","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

Thermal cycling behaviors of different plasma-sprayed zirconate thermal/environmental barrier coating systems in water vapor atmospheres 不同等离子喷涂锆酸酯隔热/环境屏障涂层系统在水蒸气环境中的热循环行为

IF 4.8 2区材料科学

Materials Characterization Pub Date : 2024-10-12 DOI: 10.1016/j.matchar.2024.114453

{"title":"Thermal cycling behaviors of different plasma-sprayed zirconate thermal/environmental barrier coating systems in water vapor atmospheres","authors":"","doi":"10.1016/j.matchar.2024.114453","DOIUrl":"10.1016/j.matchar.2024.114453","url":null,"abstract":"<div><div>As the demand for higher operating temperatures in gas turbine engines, low thermal conductivity thermal/environmental barrier coatings (T/EBCs) systems are urgently needed to protect the structural components of silicon carbide ceramic matrix composites (SiC CMCs). In this paper, several T/EBCs systems with zirconate as the top layer were prepared by air plasma spraying (APS) on environmental barrier coatings (EBCs) systems, and thermal cycling tests were carried out at 1400 °C in a 90 % H<sub>2</sub>O-balanced O<sub>2</sub> water vapor atmosphere. When there were no transition layers, the zirconate top layer produced many horizontal and vertical cracks under severe thermal mismatch stress. When the transition layers existed, the thermal mismatch stress was obviously relieved and the horizontal cracks basically disappeared. The morphology of the vertical cracks in the zirconate top layer varied with the different transition layers, and no obvious cracks were found in both the Yb<sub>2</sub>Si<sub>2</sub>O<sub>7</sub> or mullite transition layers, indicating that they are highly resistant to crack extension. For the bonding layer, the addition of HfO<sub>2</sub> particles into the Si layer significantly suppressed crack propagation. These findings may contribute to laying the foundation for the material and structural design of transition layers in long-life T/EBCs systems.</div></div>","PeriodicalId":18727,"journal":{"name":"Materials Characterization","volume":null,"pages":null},"PeriodicalIF":4.8,"publicationDate":"2024-10-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142526365","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

Quantitative revealing the solute segregation behavior at melt pool boundary in additively manufactured stainless steel using a novel processing method for precise positioning by HAADF-STEM 利用 HAADF-STEM 精确定位的新型加工方法定量揭示添加式制造不锈钢中熔池边界的溶质偏析行为

IF 4.8 2区材料科学

Materials Characterization Pub Date : 2024-10-05 DOI: 10.1016/j.matchar.2024.114435

{"title":"Quantitative revealing the solute segregation behavior at melt pool boundary in additively manufactured stainless steel using a novel processing method for precise positioning by HAADF-STEM","authors":"","doi":"10.1016/j.matchar.2024.114435","DOIUrl":"10.1016/j.matchar.2024.114435","url":null,"abstract":"<div><div>Laser-powder bed fusion (LPBF) enables the fabrication of complex metallic components by manipulating various laser scan strategies to control microstructure and texture. Multiple thermal cycling and rapid solidification lead to non-equilibrium, non-uniform microstructure, and micro-segregation at the melt pool boundary (MPB), whose accurate location is still invisible by transmission electron microscopy (TEM), and quantitative concentration remains imprecise. In this study, we proposed a novel method to make it clear by controlling the crystallographic texture of 316 L stainless steel through unique LPBF processing parameters to obtain a single-crystal-like microstructure of the cellular structures along the laser scanning direction. The accurate location of the track-track MPB is distinguishable by means of the transverse and longitudinal cellular dislocation structures on both sides. The edge-on state of the track-track MPB makes the quantitative concentration analysis precisely using high-angle annular dark-field scanning TEM with energy-dispersive X-ray spectroscopy, which is in good agreement with the Scheil-Gulliver solidification simulations.</div></div>","PeriodicalId":18727,"journal":{"name":"Materials Characterization","volume":null,"pages":null},"PeriodicalIF":4.8,"publicationDate":"2024-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142418176","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Enhanced high-temperature mechanical properties and strengthening mechanisms of chemically prepared nano-TiC reinforced IN738LC via laser powder bed fusion 通过激光粉末床熔融技术提高化学制备的纳米钛强化 IN738LC 的高温力学性能和强化机理

IF 4.8 2区材料科学

Materials Characterization Pub Date : 2024-10-04 DOI: 10.1016/j.matchar.2024.114434

{"title":"Enhanced high-temperature mechanical properties and strengthening mechanisms of chemically prepared nano-TiC reinforced IN738LC via laser powder bed fusion","authors":"","doi":"10.1016/j.matchar.2024.114434","DOIUrl":"10.1016/j.matchar.2024.114434","url":null,"abstract":"<div><div>Fabrication of high-strength nickel-based composites to meet the demanding service requirements in aerospace environments is a significant challenge. This paper introduces the wet chemical method to prepare the nano-TiC reinforced IN738LC. In contrast to the conventional ball milling approach, this method attains superior attachment of nanoparticles. By employing a full-factorial experimental design, the correlation between Laser-powder bed fusion (L-PBF) processing parameters and the porosity, micro-hardness, and high-temperature tensile strength of as-built samples was examined. The results indicate that the optimal processing parameters are a laser power of 225 W, scanning speed of 750 mm/s, and hatch space of 0.09 mm, with a Volumetric energy density (VED) of 111.1 J/mm<sup>3</sup>. Compared to IN738LC, the chemically prepared TiC-IN738LC exhibits a 45 % increase in room temperature tensile strength (400 MPa) and a 65 % increase in high-temperature tensile strength (120 MPa). Compared with ball-milled TiC-IN738LC, the chemically prepared samples present superior microstructure with more equiaxed grains. The morphological analysis of the tensile samples reveals that the presence of dimples are crucial in enhancing the ductility properties. Furthermore, this study identifies the Orowan strengthening mechanism and the grain refinement strengthening mechanism as the principal mechanisms of reinforcement by nano-ceramics.</div></div>","PeriodicalId":18727,"journal":{"name":"Materials Characterization","volume":null,"pages":null},"PeriodicalIF":4.8,"publicationDate":"2024-10-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142418174","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The effect of oxide scale on the corrosion resistance of SUS301L stainless steel welding joints 氧化鳞对 SUS301L 不锈钢焊接接头耐腐蚀性的影响

IF 4.8 2区材料科学

Materials Characterization Pub Date : 2024-10-02 DOI: 10.1016/j.matchar.2024.114431

引用次数: 0

Achieving high strength and ductility of Al-Zn-Mg-Cu alloys via laser shock peening and spray forming 通过激光冲击强化和喷射成形实现铝-锌-镁-铜合金的高强度和延展性

IF 4.8 2区材料科学

Materials Characterization Pub Date : 2024-10-01 DOI: 10.1016/j.matchar.2024.114427

{"title":"Achieving high strength and ductility of Al-Zn-Mg-Cu alloys via laser shock peening and spray forming","authors":"","doi":"10.1016/j.matchar.2024.114427","DOIUrl":"10.1016/j.matchar.2024.114427","url":null,"abstract":"<div><div>In order to further enhance the strength and ductility of ultra-high strength aluminum alloys, the laser shock peening technology was applied to ultra-high strength Al-Zn-Mg-Cu alloy. The ultimate tensile strength, elongation and hardness can reach to 751 MPa, 11 % and 208.3 HV by combining spray forming, secondary extrusion, solid solution, retrogression and reaging as well as laser shock peening. The high strength and hardness of the alloys is mainly attributed to the fine-grained layer on surface as well as new grain boundaries, dislocation cells and high-density dislocations introduced by laser shock peening, uniform nano-sized strengthening phases with high density precipitated during heat treatments. The excellent ductility of the alloys is mainly ascribed to multiple structures including fine-grained layer on surface and slip lines inside different grains introduced by laser shock peening, smaller size of fibrous grains and Al<sub>7</sub>Cu<sub>2</sub>Fe phase produced by secondary extrusion and spray forming. The aging treatment after laser shock peening can lead to the annihilation of high-density dislocations as well as significantly promote the formation of stable and coarse η phase, which can greatly reduce the strength of the studied alloys.</div></div>","PeriodicalId":18727,"journal":{"name":"Materials Characterization","volume":null,"pages":null},"PeriodicalIF":4.8,"publicationDate":"2024-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142418172","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

Revealing the substantial impact of trace Mg addition on the microstructural configuration of a cast Al-Li-Cu-Zr alloy under various conditions 揭示微量镁添加在不同条件下对铝-锂-铜-锌铸造合金微观结构构造的重大影响

IF 4.8 2区材料科学

Materials Characterization Pub Date : 2024-10-01 DOI: 10.1016/j.matchar.2024.114428

{"title":"Revealing the substantial impact of trace Mg addition on the microstructural configuration of a cast Al-Li-Cu-Zr alloy under various conditions","authors":"","doi":"10.1016/j.matchar.2024.114428","DOIUrl":"10.1016/j.matchar.2024.114428","url":null,"abstract":"<div><div>In this study, the impact of 0.2 wt% Mg addition on the microstructural configuration of a cast Al-2.5Li-2.5Cu-0.15Zr alloy under different heat treatment conditions was investigated using multiscale characterization. Results indicate that in the as-cast state, trace Mg forms the low-melting-point Al<sub>2</sub>CuMg eutectic phases and promotes grain refinement. In the natural aging state, trace Mg promotes the precipitation of fine Guinier-Preston (GP) zones independent of pre-existing δ′-Al<sub>3</sub>Li phases. In the artificial aging state, trace Mg mainly leads to the inducing of GP zones, suppression of θ′-Al<sub>2</sub>Cu phases, and promotion of T<sub>1</sub>-Al<sub>2</sub>CuLi phases. δ′ phases with slight diameter reduction and minimal S′-Al<sub>2</sub>CuMg phases with two variants are also observed. Atomic-level analysis of the two newly formed composite precipitates indicates that <em>L</em>1<sub>2</sub> structure phases on both sides of the GP zone have an anti-phase relationship. This study is expected to provide theoretical insights into the microstructural origins underlying the beneficial effects of Mg microalloying in cast Al-Li-Cu alloys.</div></div>","PeriodicalId":18727,"journal":{"name":"Materials Characterization","volume":null,"pages":null},"PeriodicalIF":4.8,"publicationDate":"2024-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142418251","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

Characterization of L12-Al3Ce phase and its purification mechanism in the Al-Ce-TiCN alloy Al-Ce-TiCN 合金中 L12-Al3Ce 相的特征及其纯化机制

IF 4.8 2区材料科学

Materials Characterization Pub Date : 2024-10-01 DOI: 10.1016/j.matchar.2024.114425

{"title":"Characterization of L12-Al3Ce phase and its purification mechanism in the Al-Ce-TiCN alloy","authors":"","doi":"10.1016/j.matchar.2024.114425","DOIUrl":"10.1016/j.matchar.2024.114425","url":null,"abstract":"<div><div>Rare earth element Ce has a positive purifying effect on Fe and Si impurities in pure aluminum. In this study, we unveiled the mechanism of Ce purification of Fe and Si impurities in commercial pure aluminum at the atomic scale via utilizing the properties of TiCN nanoparticles, which exhibit distribution along grain boundaries and impede solute atom diffusion at specific cooling rates. The transition phase L1<sub>2</sub>-Al<sub>3</sub>Ce was characterized in aluminum, which is considered to be an important transition phase to purified products. Furthermore, High Angle Dark Field Scanning Transmission Electron Microscopy (HADDF-STEM) and 3D Atom Probe Tomography (3D-APT) results showed that Ce could respectively enrich the Fe and Si impurities, resulting in the formation of Al-Ce-Fe and Al-Ce-Si clusters. Density functional theory (DFT) results indicated that Fe and Si atoms can incorporate into L1<sub>2</sub>-Al<sub>3</sub>Ce crystal, forming more stable structures and therefore giving rise to the formation of Al-Ce-Si and Al-Ce-Fe nanoclusters. This study provides atomic-scale insights into the mechanism of Ce purifying Fe and Si impurities in aluminum.</div></div>","PeriodicalId":18727,"journal":{"name":"Materials Characterization","volume":null,"pages":null},"PeriodicalIF":4.8,"publicationDate":"2024-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142418222","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 microalloying on the properties and Cr precipitate thermal stability of Cu-Cr-Nb alloys 微合金化对铜-铬-铌合金性能和铬析出物热稳定性的影响

IF 4.8 2区材料科学

Materials Characterization Pub Date : 2024-10-01 DOI: 10.1016/j.matchar.2024.114426

引用次数: 0

Enhancing mechanical property and corrosion resistance of Al0.3CoCrFeNi1.5 high entropy alloy via grain boundary engineering 通过晶界工程提高 Al0.3CoCrFeNi1.5 高熵合金的机械性能和耐腐蚀性能

IF 4.8 2区材料科学

Materials Characterization Pub Date : 2024-10-01 DOI: 10.1016/j.matchar.2024.114420

{"title":"Enhancing mechanical property and corrosion resistance of Al0.3CoCrFeNi1.5 high entropy alloy via grain boundary engineering","authors":"","doi":"10.1016/j.matchar.2024.114420","DOIUrl":"10.1016/j.matchar.2024.114420","url":null,"abstract":"<div><div>In the present study, to improve the performances of Al<sub>0.3</sub>CoCrFeNi<sub>1.5</sub> high entropy alloys (HEAs), grain boundary character distribution (GBCD) of Al<sub>0.3</sub>CoCrFeNi<sub>1.5</sub> HEA has been optimized by an appropriate thermo-mechanical processing. The experiment results showed that the fraction of low-Σ coincidence site lattice (CSL) boundaries could reach approximately 80 % through cold rolling with deformation of 8 % and subsequent annealing at 1050 °C for 5 min. The reason for GBCD optimization could be attributed to sufficient strain-induced boundary migration (SIBM) or grain growth after recrystallization. While recrystallization is not favorable for optimizing GBCD. The mechanical properties and corrosion resistance have been enhanced, with a more pronounced improvement observed in the corrosion resistance. The corrosion current density i<sub>corr</sub> of the GBEM specimen stands at 0.23 μA∙cm<sup>−2</sup>, representing a reduction of 66 % in comparison to the BM specimen (0.68 μA∙cm<sup>−2</sup>). The improvement of corrosion resistance of Al<sub>0.3</sub>CoCrFeNi<sub>1.5</sub> HEA resulted from the discontinuous random grain boundaries (RGBs) broken by the high fraction of low-ΣCSL boundaries, especially Σ3 boundaries suppressed the propagation of corrosion crack.</div></div>","PeriodicalId":18727,"journal":{"name":"Materials Characterization","volume":null,"pages":null},"PeriodicalIF":4.8,"publicationDate":"2024-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142418171","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