Pub Date : 2024-09-02DOI: 10.1016/j.jmrt.2024.08.191
F. Sordetti, A. Palombi, A. Varone, N. Picco, M. Magnan, E. Marin, C. Maranzana, A. Lanzutti
The mechanical and corrosion properties of duplex stainless steels (DSS) depend on the distribution of ferrite and austenite as well as the presence of secondary phases. It is therefore necessary to accurately determine both the distribution of the phases and their morphology. The aim of this research is to define a standard method for the determination of the volume fraction of the phases present in a SAF2507 SDSS by analysing images acquired by light microscope. To do this, the material is heat-treated at 850 °C for 5 min, 15 min, 30 min, 1h, 5h to stimulate the formation of the σ-phase. The metallographic etchant capable of maximising phase contrast is then identified. Micrographic analyses are performed using different reagents at different holding times and temperatures, in order to find the best combination. A standard procedure is then defined for the image analysis. The data obtained are processed to calculate the phase distribution. The results are compared with the quantitative analysis performed using X-ray diffraction as reference.
双相不锈钢（DSS）的机械和腐蚀特性取决于铁素体和奥氏体的分布以及次生相的存在。因此，有必要准确测定这些相的分布及其形态。这项研究的目的是确定一种标准方法，通过分析光学显微镜获取的图像，确定 SAF2507 SDSS 中各相的体积分数。为此，在 850 °C 下对材料分别进行 5 分钟、15 分钟、30 分钟、1 小时和 5 小时的热处理，以促进 σ 相的形成。然后确定能使相衬度最大化的金相蚀刻剂。在不同的保持时间和温度下使用不同的试剂进行显微分析，以找到最佳组合。然后确定图像分析的标准程序。对获得的数据进行处理，以计算相位分布。将结果与以 X 射线衍射为参考的定量分析结果进行比较。
{"title":"Experimental review and accuracy of etchants used for phase analysis of SAF2507 Super Duplex Stainless Steel","authors":"F. Sordetti, A. Palombi, A. Varone, N. Picco, M. Magnan, E. Marin, C. Maranzana, A. Lanzutti","doi":"10.1016/j.jmrt.2024.08.191","DOIUrl":"https://doi.org/10.1016/j.jmrt.2024.08.191","url":null,"abstract":"The mechanical and corrosion properties of duplex stainless steels (DSS) depend on the distribution of ferrite and austenite as well as the presence of secondary phases. It is therefore necessary to accurately determine both the distribution of the phases and their morphology. The aim of this research is to define a standard method for the determination of the volume fraction of the phases present in a SAF2507 SDSS by analysing images acquired by light microscope. To do this, the material is heat-treated at 850 °C for 5 min, 15 min, 30 min, 1h, 5h to stimulate the formation of the σ-phase. The metallographic etchant capable of maximising phase contrast is then identified. Micrographic analyses are performed using different reagents at different holding times and temperatures, in order to find the best combination. A standard procedure is then defined for the image analysis. The data obtained are processed to calculate the phase distribution. The results are compared with the quantitative analysis performed using X-ray diffraction as reference.","PeriodicalId":501120,"journal":{"name":"Journal of Materials Research and Technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-09-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142179984","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-09-02DOI: 10.1016/j.jmrt.2024.08.211
Ashok Bhadeliya, Birgit Rehmer, Bernard Fedelich, Torsten Jokisch, Birgit Skrotzki, Jürgen Olbricht
The integration of additive manufacturing with traditional processes, termed hybrid additive manufacturing, has expanded its application domain, particularly in the repair of gas turbine blade tips. However, process-related defects in additively manufactured materials, interface formation, and material property mismatches in dual-material structures can significantly impact the fatigue performance of components. This investigation examines the low cycle fatigue and fatigue crack growth behaviors in dual-material specimens of nickel-based alloys, specifically the additively manufactured STAL15 and the cast alloy 247DS, at elevated temperatures. Low cycle fatigue experiments were conducted at temperatures of 950 °C and 1000 °C under a range of strain levels (0.3%–0.8%) and fatigue crack growth tests were conducted at 950 °C with stress ratios of 0.1 and −1. Fractographic and microscopic analyses were performed to comprehend fatigue crack initiation and crack growth mechanisms in the dual-material structure. The results consistently indicated crack initiation and fatigue fracture in the additively manufactured STAL15 material. Notably, fatigue crack growth retardation was observed near the interface when the crack extended from the additively manufactured STAL15 material to the perpendicularly positioned interface. This study highlights the importance of considering yield strength mismatch, as well as the potential effects of residual stresses and grain structure differences, in the interpretation of fatigue crack growth behavior at the interface.
{"title":"Fatigue and fracture in dual-material specimens of nickel-based alloys fabricated by hybrid additive manufacturing","authors":"Ashok Bhadeliya, Birgit Rehmer, Bernard Fedelich, Torsten Jokisch, Birgit Skrotzki, Jürgen Olbricht","doi":"10.1016/j.jmrt.2024.08.211","DOIUrl":"https://doi.org/10.1016/j.jmrt.2024.08.211","url":null,"abstract":"The integration of additive manufacturing with traditional processes, termed hybrid additive manufacturing, has expanded its application domain, particularly in the repair of gas turbine blade tips. However, process-related defects in additively manufactured materials, interface formation, and material property mismatches in dual-material structures can significantly impact the fatigue performance of components. This investigation examines the low cycle fatigue and fatigue crack growth behaviors in dual-material specimens of nickel-based alloys, specifically the additively manufactured STAL15 and the cast alloy 247DS, at elevated temperatures. Low cycle fatigue experiments were conducted at temperatures of 950 °C and 1000 °C under a range of strain levels (0.3%–0.8%) and fatigue crack growth tests were conducted at 950 °C with stress ratios of 0.1 and −1. Fractographic and microscopic analyses were performed to comprehend fatigue crack initiation and crack growth mechanisms in the dual-material structure. The results consistently indicated crack initiation and fatigue fracture in the additively manufactured STAL15 material. Notably, fatigue crack growth retardation was observed near the interface when the crack extended from the additively manufactured STAL15 material to the perpendicularly positioned interface. This study highlights the importance of considering yield strength mismatch, as well as the potential effects of residual stresses and grain structure differences, in the interpretation of fatigue crack growth behavior at the interface.","PeriodicalId":501120,"journal":{"name":"Journal of Materials Research and Technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-09-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142179987","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-09-02DOI: 10.1016/j.jmrt.2024.09.002
Kun Yang, Bin Li, Hao Chen, Guo Li, Guobing Wei, Xiaodong Peng
Isothermal compression tests were conducted out on the Mg–9Li–3Al-1(La/Ce) (wt.%) alloy under different deformation parameter through a Gleeble-3500 thermal-mechanical simulator. The flow curves at high strain rates exhibit a "serrated flow”, which is a dynamic strain aging behavior. = 0.9253 and = 7.64% quantified the accuracy of the constitutive equations, indicating that this equation has reliable predictive ability. The thermal processing maps indicated that the safe processing region is T = 537–623 K, = 0.041–0.001 s. This alloy has excellent formability. When deformation is at T = 473 K, = 1 s, there are more deformed grains in two phases, and broken β-Li grains distributed in chains along the RD. In addition, some α-Mg phases precipitated from the β-Li phase, distributed along the β-Li grain boundaries, and they were dominated by recrystallized grains with low dislocation density. High-density dislocation regions located both at the grain boundaries and inside the grains. When deformation is at T = 473 K, = 0.01 s, all the deformed grains in two phases decreased with decreasing strain rate, and they transformed more into substructures. The high-density dislocation regions inside the grains gradually disappear. Additionally, the size of precipitated α-Mg phase increased slightly, which is still predominantly located at the grain boundaries. When deformation is at T = 623 K, = 0.01 s, the degree of recrystallization increases significantly with increasing temperature. The high-density dislocation regions almost disappeared. Interestingly, large amounts of α-Mg grains precipitated inside the β-Li grains.
通过 Gleeble-3500 热机械模拟器对 Mg-9Li-3Al-1(La/Ce)（重量百分比）合金在不同变形参数下进行了等温压缩试验。高应变速率下的流动曲线呈现出 "锯齿流动"，这是一种动态应变时效行为。 = 0.9253 和 = 7.64% 量化了构成方程的准确性，表明该方程具有可靠的预测能力。热加工图显示，安全加工区域为 T = 537-623 K，= 0.041-0.001 s。当变形温度为 T = 473 K, = 1 s 时，两相变形晶粒较多，β-Li 晶粒破碎，沿 RD 呈链状分布。此外，一些 α-Mg 相从 β-Li 相中析出，沿 β-Li 晶界分布，并以低位错密度的再结晶晶粒为主。高密度位错区位于晶界和晶粒内部。当变形在 T = 473 K, = 0.01 s 时，两相中所有变形晶粒都随着应变速率的降低而减少，并更多地转变为亚结构。晶粒内部的高密度位错区逐渐消失。此外，析出的 α-Mg 相的尺寸略有增加，但仍主要位于晶界。当变形温度为 T = 623 K, = 0.01 s 时，再结晶程度随温度升高而显著增加。高密度位错区域几乎消失。有趣的是，β-Li 晶粒内部析出了大量的 α-Mg 晶粒。
{"title":"Research on deformation behavior, microstructure evolution and phase transformation of ultra-light LA93-1(La/Ce) alloy","authors":"Kun Yang, Bin Li, Hao Chen, Guo Li, Guobing Wei, Xiaodong Peng","doi":"10.1016/j.jmrt.2024.09.002","DOIUrl":"https://doi.org/10.1016/j.jmrt.2024.09.002","url":null,"abstract":"Isothermal compression tests were conducted out on the Mg–9Li–3Al-1(La/Ce) (wt.%) alloy under different deformation parameter through a Gleeble-3500 thermal-mechanical simulator. The flow curves at high strain rates exhibit a \"serrated flow”, which is a dynamic strain aging behavior. = 0.9253 and = 7.64% quantified the accuracy of the constitutive equations, indicating that this equation has reliable predictive ability. The thermal processing maps indicated that the safe processing region is T = 537–623 K, = 0.041–0.001 s. This alloy has excellent formability. When deformation is at T = 473 K, = 1 s, there are more deformed grains in two phases, and broken β-Li grains distributed in chains along the RD. In addition, some α-Mg phases precipitated from the β-Li phase, distributed along the β-Li grain boundaries, and they were dominated by recrystallized grains with low dislocation density. High-density dislocation regions located both at the grain boundaries and inside the grains. When deformation is at T = 473 K, = 0.01 s, all the deformed grains in two phases decreased with decreasing strain rate, and they transformed more into substructures. The high-density dislocation regions inside the grains gradually disappear. Additionally, the size of precipitated α-Mg phase increased slightly, which is still predominantly located at the grain boundaries. When deformation is at T = 623 K, = 0.01 s, the degree of recrystallization increases significantly with increasing temperature. The high-density dislocation regions almost disappeared. Interestingly, large amounts of α-Mg grains precipitated inside the β-Li grains.","PeriodicalId":501120,"journal":{"name":"Journal of Materials Research and Technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-09-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142179985","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Salvia Miltiorrhiza, extensively distributed and commonly employed as a traditional Chinese medicinal herb, has garnered significant attention. In this study, the Salvia Miltiorrhiza extract (SME) was prepared by one-step water extraction method, and was firstly used as a novel corrosion inhibitor for Q235 steel in 1 mol/L HCl solution. As identified via liquid chromatography-mass spectrometry, the findings reveal that Salvianic acid A, tanshinone II A, danshenxinkun D, dihydrotanshinone, and methylene tanshinquinone are the primary constituents of SME. The optimum corrosion inhibition efficiency reached 92.8 % at 200 mg/L and maintained at 90.4 % after 72 h. Based on scanning vibration electrode technology (SVET) monitoring, the adsorption of inhibitor molecules on metal surface greatly retarded the propagation of localized corrosion. AFM examination of the corroded surface reveals that the samples supplemented with SME exhibit a smoother surface compared to the blank group. The force curve graph for the SME-added group demonstrates a more evenly distributed point array and an elevated average adhesion force, indicating that the addition of SME improves the corrosion resistance of the metal surface. XPS characterization illustrated that SME interacted with iron ions to form insoluble precipitate. This work investigated the application of SME as an eco-friendly corrosion inhibitor for carbon steel in acidic medium, providing a new approach for the high value-added utilization of Salvia Milliorrhiza.
丹参作为一种分布广泛且常用的传统中药材，受到了广泛关注。本研究采用一步水提取法制备了丹参提取物（SME），并首次在 1 mol/L HCl 溶液中用作 Q235 钢的新型缓蚀剂。经液相色谱-质谱鉴定，结果表明丹参酸 A、丹参酮 II A、丹参新酮 D、二氢丹参酮和亚甲基丹参醌是 SME 的主要成分。根据扫描振动电极技术（SVET）的监测，抑制剂分子在金属表面的吸附大大延缓了局部腐蚀的扩展。对腐蚀表面的原子力显微镜检查显示，与空白组相比，添加了 SME 的样品表面更加光滑。添加 SME 组的力曲线图显示，点阵分布更均匀，平均附着力更高，表明添加 SME 提高了金属表面的耐腐蚀性。XPS 表征表明，SME 与铁离子相互作用，形成不溶性沉淀。这项研究将 SME 用作酸性介质中碳钢的环保型缓蚀剂，为丹参的高附加值利用提供了一种新方法。
{"title":"Exploration on the corrosion inhibition performance of Salvia miltiorrhiza extract as a green corrosion inhibitor for Q235 steel in HCl environment","authors":"Cheng Zeng, Zong-Yi Zhou, Wen-Jie Mai, Qiu-Hao Chen, Jin-Bei He, Bo-Kai Liao","doi":"10.1016/j.jmrt.2024.09.003","DOIUrl":"https://doi.org/10.1016/j.jmrt.2024.09.003","url":null,"abstract":"Salvia Miltiorrhiza, extensively distributed and commonly employed as a traditional Chinese medicinal herb, has garnered significant attention. In this study, the Salvia Miltiorrhiza extract (SME) was prepared by one-step water extraction method, and was firstly used as a novel corrosion inhibitor for Q235 steel in 1 mol/L HCl solution. As identified via liquid chromatography-mass spectrometry, the findings reveal that Salvianic acid A, tanshinone II A, danshenxinkun D, dihydrotanshinone, and methylene tanshinquinone are the primary constituents of SME. The optimum corrosion inhibition efficiency reached 92.8 % at 200 mg/L and maintained at 90.4 % after 72 h. Based on scanning vibration electrode technology (SVET) monitoring, the adsorption of inhibitor molecules on metal surface greatly retarded the propagation of localized corrosion. AFM examination of the corroded surface reveals that the samples supplemented with SME exhibit a smoother surface compared to the blank group. The force curve graph for the SME-added group demonstrates a more evenly distributed point array and an elevated average adhesion force, indicating that the addition of SME improves the corrosion resistance of the metal surface. XPS characterization illustrated that SME interacted with iron ions to form insoluble precipitate. This work investigated the application of SME as an eco-friendly corrosion inhibitor for carbon steel in acidic medium, providing a new approach for the high value-added utilization of Salvia Milliorrhiza.","PeriodicalId":501120,"journal":{"name":"Journal of Materials Research and Technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-09-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142179977","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Upon 98% reduction cold-rolling, a single layer AA3003 foil material of 115 μm thick was intermediately annealed at 300–420 °C/1-8 h, and the preferred temperature and time of the intermediate annealing for the laminated AA4343/AA3003/AA4343 composite foil material were determined. All of these samples were cold rolled by 40% to 70 μm thick and finally annealed at a temperature in the range of 300–550 °C for 1–9 h. Their sagging resistance and microstructure were investigated using simulated brazing treatment, optical microscopy (OM), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). For the single layer AA3003 foil, the sagging distance decreased first and then increased with increasing intermediate annealing temperature, and the lowest sagging distance corresponds to the coarsest grain in the recrystallized sample. After the final annealing for the single layer, the sagging distance decreased monotonously. For the laminated foil subjected to the final annealing, the sagging distance curves decreased first and then increased with increasing annealing temperature and time. The improvement of sagging resistance was attributed to the recovery of two types of materials during annealing process. The deterioration of the sagging resistance in the laminated foils was due to the corrosion in the brazing process, resulted from the Si diffusion from the cladding layer into the core layer. It is the coarse grains, few dislocations and minimal diffusion of Si that are crucial for improving the sagging resistance of the laminated foils.
{"title":"The influence of annealing process on the sagging resistance of AA3003 foil and laminated AA4343/AA3003/AA4343 composite foil materials","authors":"Jianzhu Wang, Kunyuan Gao, Xiangyuan Xiong, Yue Zhang, Yusheng Ding, Xiaolan Wu, Shengping Wen, Hui Huang, Wu Wei, Li Rong, Zuoren Nie, Dejing Zhou","doi":"10.1016/j.jmrt.2024.08.207","DOIUrl":"https://doi.org/10.1016/j.jmrt.2024.08.207","url":null,"abstract":"Upon 98% reduction cold-rolling, a single layer AA3003 foil material of 115 μm thick was intermediately annealed at 300–420 °C/1-8 h, and the preferred temperature and time of the intermediate annealing for the laminated AA4343/AA3003/AA4343 composite foil material were determined. All of these samples were cold rolled by 40% to 70 μm thick and finally annealed at a temperature in the range of 300–550 °C for 1–9 h. Their sagging resistance and microstructure were investigated using simulated brazing treatment, optical microscopy (OM), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). For the single layer AA3003 foil, the sagging distance decreased first and then increased with increasing intermediate annealing temperature, and the lowest sagging distance corresponds to the coarsest grain in the recrystallized sample. After the final annealing for the single layer, the sagging distance decreased monotonously. For the laminated foil subjected to the final annealing, the sagging distance curves decreased first and then increased with increasing annealing temperature and time. The improvement of sagging resistance was attributed to the recovery of two types of materials during annealing process. The deterioration of the sagging resistance in the laminated foils was due to the corrosion in the brazing process, resulted from the Si diffusion from the cladding layer into the core layer. It is the coarse grains, few dislocations and minimal diffusion of Si that are crucial for improving the sagging resistance of the laminated foils.","PeriodicalId":501120,"journal":{"name":"Journal of Materials Research and Technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-09-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142179989","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-09-02DOI: 10.1016/j.jmrt.2024.08.205
Fan Huang, Baijiang An, Zhipeng Wang, Shumei Dou, Weiwei Zhao, Dengqi Zhong, Lijun Ren, Rong Ma, Huiqin Li
In this work, CrO/TiO composite coatings were prepared on -AlO insulating ceramic matrix surface by screen printing and solid phase sintering methods to yield an average film thickness of about 14.10 μm. Scanning electron microscopy (SEM) revealed changes in the pore structures of the coatings at different TiO contents. The atomic force microscopy (AFM) analysis of the coating surface roughness suggested a TiO content of 0.025 mol to yield the best surface roughness and pore structure of the coating. The calculation showed an increase in the energy level of the deep trap center on the surface from 1.506 eV to 1.547 eV, reaching a maximum. The surface resistivity of insulating ceramics decreased from 10 Ω to 10 Ω. The formation of deep surface traps and the decrease in surface resistivity promoted charge dispersion and suppressed the formation of flashover channels, effectively improving the surface flashover voltage of the ceramics.
{"title":"Preparation of porous composite coatings to suppress surface charge movement and reduce electrical resistivity","authors":"Fan Huang, Baijiang An, Zhipeng Wang, Shumei Dou, Weiwei Zhao, Dengqi Zhong, Lijun Ren, Rong Ma, Huiqin Li","doi":"10.1016/j.jmrt.2024.08.205","DOIUrl":"https://doi.org/10.1016/j.jmrt.2024.08.205","url":null,"abstract":"In this work, CrO/TiO composite coatings were prepared on -AlO insulating ceramic matrix surface by screen printing and solid phase sintering methods to yield an average film thickness of about 14.10 μm. Scanning electron microscopy (SEM) revealed changes in the pore structures of the coatings at different TiO contents. The atomic force microscopy (AFM) analysis of the coating surface roughness suggested a TiO content of 0.025 mol to yield the best surface roughness and pore structure of the coating. The calculation showed an increase in the energy level of the deep trap center on the surface from 1.506 eV to 1.547 eV, reaching a maximum. The surface resistivity of insulating ceramics decreased from 10 Ω to 10 Ω. The formation of deep surface traps and the decrease in surface resistivity promoted charge dispersion and suppressed the formation of flashover channels, effectively improving the surface flashover voltage of the ceramics.","PeriodicalId":501120,"journal":{"name":"Journal of Materials Research and Technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-09-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142179983","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The metastability of the dendritic phase is crucial in determining the mechanical properties and mechanisms of the Ti-based dendrite-reinforced bulk metallic glass composites (BMGCs). However, tailoring the metastability effectively remains challenging. In this study, we propose a straightforward and effective strategy to tailor the dendrites composition and metastability using conventional Titanium alloys. Initially, six common Titanium alloys with increasing content of β-stabilizing elements such as Ti, Ti–6Al–4V, Ti–13Nb–13Zr, Ti–15Mo, Ti–12Mo–6Zr–2Fe and Ti-4.5Fe-6.8Mo-1.5Al were selected. Subsequently, a series of dendrite-reinforced BMGCs denoted as T1-T6 were designed by alloying these Titanium alloys with a specific amorphous alloy. It was found that the microstructure, stability and mechanical behaviors of these composites change significantly as the content of β-stabilizing elements in the dendritic phase increases monotonically. Based on their microstructure and mechanical behaviors, these composites can be classified into three categories: T1, T2 and T3, T4-T6. The T1 alloy exhibits brittle deformation characteristics due to the significantly higher elastic modulus of the dendritic phase. In contrast, the T2 and T3 alloys demonstrate good tensile plasticity and remarkable work-hardening ability, attributed to the metastable β phase undergoing stress-induced phase transformation during deformation. On the other hand, the T4-T6 alloys, consisting of stable β phase, deform via dislocation slip, resulting in a higher yielding stress and compression plasticity. The composition design strategy presented in this study, along with the correlation between mechanical behaviors and dendrite stability, may offer a novel perspective for the development of Ti-based dendrite-reinforced BMGCs.
{"title":"A strategy for designing Ti-based in-situ bulk metallic glass composites with tailored structural metastability using conventional titanium alloys","authors":"Dingming Liu, Yufan Li, Hongxi Deng, Yan Liu, Wenting Zhang, Lei Li, Xujin Ge, Huiyuan Zheng, Wenfeng Liu, Zhengwang Zhu, Haifeng Zhang","doi":"10.1016/j.jmrt.2024.08.208","DOIUrl":"https://doi.org/10.1016/j.jmrt.2024.08.208","url":null,"abstract":"The metastability of the dendritic phase is crucial in determining the mechanical properties and mechanisms of the Ti-based dendrite-reinforced bulk metallic glass composites (BMGCs). However, tailoring the metastability effectively remains challenging. In this study, we propose a straightforward and effective strategy to tailor the dendrites composition and metastability using conventional Titanium alloys. Initially, six common Titanium alloys with increasing content of β-stabilizing elements such as Ti, Ti–6Al–4V, Ti–13Nb–13Zr, Ti–15Mo, Ti–12Mo–6Zr–2Fe and Ti-4.5Fe-6.8Mo-1.5Al were selected. Subsequently, a series of dendrite-reinforced BMGCs denoted as T1-T6 were designed by alloying these Titanium alloys with a specific amorphous alloy. It was found that the microstructure, stability and mechanical behaviors of these composites change significantly as the content of β-stabilizing elements in the dendritic phase increases monotonically. Based on their microstructure and mechanical behaviors, these composites can be classified into three categories: T1, T2 and T3, T4-T6. The T1 alloy exhibits brittle deformation characteristics due to the significantly higher elastic modulus of the dendritic phase. In contrast, the T2 and T3 alloys demonstrate good tensile plasticity and remarkable work-hardening ability, attributed to the metastable β phase undergoing stress-induced phase transformation during deformation. On the other hand, the T4-T6 alloys, consisting of stable β phase, deform via dislocation slip, resulting in a higher yielding stress and compression plasticity. The composition design strategy presented in this study, along with the correlation between mechanical behaviors and dendrite stability, may offer a novel perspective for the development of Ti-based dendrite-reinforced BMGCs.","PeriodicalId":501120,"journal":{"name":"Journal of Materials Research and Technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-09-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142179988","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
This study investigates hybrid stainless steel (SS) 316L/Inconel 625 (IN625) materials via DED for hydrofluoric acid (HF) corrosion resistance. 20% SS 316L + 80% IN625 (20% 316L) exhibits low uniform corrosion (0.35 mm/y) and improved local corrosion performance. High CrO content in its passive film ensures uniform corrosion resistance. The thermodynamic analysis combined with microstructure observation shows reduced Nb content in 20% 316L's Laves phase, enhancing resistance to micro-galvanic local corrosion. This study provides insights into the design and manufacturing technology of corrosion-resistant materials in harsh corrosive environments.
{"title":"Achieving balanced uniform and local corrosion performance of SS 316L/IN625 hybrid alloy manufactured by directed energy deposition","authors":"Shuyao Zhang, Yajing Li, Hailong Dai, Zhe Zhang, Xu Chen","doi":"10.1016/j.jmrt.2024.08.210","DOIUrl":"https://doi.org/10.1016/j.jmrt.2024.08.210","url":null,"abstract":"This study investigates hybrid stainless steel (SS) 316L/Inconel 625 (IN625) materials via DED for hydrofluoric acid (HF) corrosion resistance. 20% SS 316L + 80% IN625 (20% 316L) exhibits low uniform corrosion (0.35 mm/y) and improved local corrosion performance. High CrO content in its passive film ensures uniform corrosion resistance. The thermodynamic analysis combined with microstructure observation shows reduced Nb content in 20% 316L's Laves phase, enhancing resistance to micro-galvanic local corrosion. This study provides insights into the design and manufacturing technology of corrosion-resistant materials in harsh corrosive environments.","PeriodicalId":501120,"journal":{"name":"Journal of Materials Research and Technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-09-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142179986","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-09-01DOI: 10.1016/j.jmrt.2024.08.203
Yitao Zheng, Fu Gu, Bin Wang, Zheng Wang, Chuang Gao, Yun Zhou, Philip Hall
Environmental and economic factors have driven research into the recycling and applications of recycled carbon fibres (rCF). This paper presents a comparative study characterizing and comparing the mechanical and thermal performance of recycled short milled carbon fibre (rSMCF) on virgin and recycled polypropylene composites. The effects of rSMCF on VPP and RPP on mechanical performance were analysed and compared. At 5 wt% rSMCF, recycled polypropylene achieved 52.3% and 47.3% improvement on tensile and flexural modulus, while at the same rSMCF loading, virgin polypropylene only improved 37.7% and 17.5%, respectively. The un-notched impact strength of RPP-based composites reduced from 83.2 kJ/m to 60.1 kJ/m when rSMCF content increased from 1 wt% to 5 wt%, indicating future work should enhance the fibre/polymer interface performance. Crystal contents () of the PP/rSMCF composites were investigated by differential scanning calorimetry (DSC), and the results were analysed and mapped to the mechanical performance. The results of this study propose a novel scalable method for the production of high-performance VPP/RPP composite materials using rSMCF.
{"title":"Thermal and mechanical behaviour of recycled short milled carbon fibre reinforced polypropylene and recycled polypropylene composites: A comparative study","authors":"Yitao Zheng, Fu Gu, Bin Wang, Zheng Wang, Chuang Gao, Yun Zhou, Philip Hall","doi":"10.1016/j.jmrt.2024.08.203","DOIUrl":"https://doi.org/10.1016/j.jmrt.2024.08.203","url":null,"abstract":"Environmental and economic factors have driven research into the recycling and applications of recycled carbon fibres (rCF). This paper presents a comparative study characterizing and comparing the mechanical and thermal performance of recycled short milled carbon fibre (rSMCF) on virgin and recycled polypropylene composites. The effects of rSMCF on VPP and RPP on mechanical performance were analysed and compared. At 5 wt% rSMCF, recycled polypropylene achieved 52.3% and 47.3% improvement on tensile and flexural modulus, while at the same rSMCF loading, virgin polypropylene only improved 37.7% and 17.5%, respectively. The un-notched impact strength of RPP-based composites reduced from 83.2 kJ/m to 60.1 kJ/m when rSMCF content increased from 1 wt% to 5 wt%, indicating future work should enhance the fibre/polymer interface performance. Crystal contents () of the PP/rSMCF composites were investigated by differential scanning calorimetry (DSC), and the results were analysed and mapped to the mechanical performance. The results of this study propose a novel scalable method for the production of high-performance VPP/RPP composite materials using rSMCF.","PeriodicalId":501120,"journal":{"name":"Journal of Materials Research and Technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142179993","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-09-01DOI: 10.1016/j.jmrt.2024.08.200
M.A. Almessiere, Y. Slimani, A.V. Trukhanov, A. Demir Korkmaz, S. Guner, S. Akhtar, Sagar E. Shirsath, A. Baykal, I. Ercan
{"title":"Corrigendum to “Effect of Nd–Y co-substitution on structural, magnetic, optical and microwave properties of NiCuZn nanospinel ferrites” [J Mater Res Technol, Volume 9, Issue 5, September–October 2020, Pages 11278-11290]","authors":"M.A. Almessiere, Y. Slimani, A.V. Trukhanov, A. Demir Korkmaz, S. Guner, S. Akhtar, Sagar E. Shirsath, A. Baykal, I. Ercan","doi":"10.1016/j.jmrt.2024.08.200","DOIUrl":"https://doi.org/10.1016/j.jmrt.2024.08.200","url":null,"abstract":"","PeriodicalId":501120,"journal":{"name":"Journal of Materials Research and Technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142179995","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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