Pub Date : 2024-08-31DOI: 10.1016/j.jmrt.2024.08.202
Shaoxu Hao, Yue Zhai, Shi Liu, Yu Jia
The dynamic tensile strength of rocks affects structural stability in geotechnical applications requiring thermal resilience. This study employs a large-diameter (Φ75 mm) split Hopkinson tension bar () to perform high-strain-rate tensile tests on red sandstone specimens subjected to thermal treatments at temperatures up to 1200 °C. However, specimens heated to 1200 °C transitioned to an amorphous melt phase, making tensile tests infeasible. The novel large-diameter technique improves the test efficiency by using double reinforcement and an adhesive to attach the specimen to the bar. An energy-based damage variable and a comprehensive rock brittleness index are used to assess the effects of the strain rate and thermal conditions on the specimens' mechanical behavior and energy dissipation. Further, an innovative dissipated energy model () describes the intrinsic nonlinearities of the rock's dissipated energy dynamics and their crucial influences on the pre-peak stress responses. A dual-threshold model is utilized to describe thermal strengthening or weakening, revealing fundamental insights into the energy mechanics of rock failure, which are vital for the integrity of high-temperature geotechnical systems.
{"title":"Mechanical properties and energy evolution of thermally damaged red sandstone in high-strain-rate impact tensile tests: Experimental and theoretical analyses","authors":"Shaoxu Hao, Yue Zhai, Shi Liu, Yu Jia","doi":"10.1016/j.jmrt.2024.08.202","DOIUrl":"https://doi.org/10.1016/j.jmrt.2024.08.202","url":null,"abstract":"The dynamic tensile strength of rocks affects structural stability in geotechnical applications requiring thermal resilience. This study employs a large-diameter (Φ75 mm) split Hopkinson tension bar () to perform high-strain-rate tensile tests on red sandstone specimens subjected to thermal treatments at temperatures up to 1200 °C. However, specimens heated to 1200 °C transitioned to an amorphous melt phase, making tensile tests infeasible. The novel large-diameter technique improves the test efficiency by using double reinforcement and an adhesive to attach the specimen to the bar. An energy-based damage variable and a comprehensive rock brittleness index are used to assess the effects of the strain rate and thermal conditions on the specimens' mechanical behavior and energy dissipation. Further, an innovative dissipated energy model () describes the intrinsic nonlinearities of the rock's dissipated energy dynamics and their crucial influences on the pre-peak stress responses. A dual-threshold model is utilized to describe thermal strengthening or weakening, revealing fundamental insights into the energy mechanics of rock failure, which are vital for the integrity of high-temperature geotechnical systems.","PeriodicalId":501120,"journal":{"name":"Journal of Materials Research and Technology","volume":"134 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142179997","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 : 2024-08-31DOI: 10.1016/j.jmrt.2024.08.201
Bin Wang, Xiaoxue Wang, Jie Zhou, Chunmiao Liu, Jie Liu, Guanhui Gao
This paper investigated the influence of ultraviolet (UV) illumination on the corrosion behavior of 7A04 aluminum alloy in 3.5% NaCl solutions with various pH values (, 7.0, and 10.0) using weight loss measurement, electrochemical methods, and surface analysis techniques. The research results indicated that the corrosion products of 7A04 alloy in salt solutions with different pH values all exhibited n-type semiconductor properties and could trigger the photovoltaic effect under UV illumination. Simultaneously, UV illumination reduced the compactness of the corrosion products, inhibited the enrichment of copper compounds (CuO), and promoted the generation of hydroxyl radicals in the solution. Therefore, UV illumination significantly accelerated the corrosion process of 7A04 alloy, with the overall acceleration effect ranking as follows: alkaline > neutral > acidic. In addition, the corrosion mechanism of 7A04 alloy in the test solutions with and without UV illumination was also discussed in this paper.
{"title":"Influence of ultraviolet illumination on the corrosion behavior of 7A04 aluminum alloy in salt solutions with different pH values","authors":"Bin Wang, Xiaoxue Wang, Jie Zhou, Chunmiao Liu, Jie Liu, Guanhui Gao","doi":"10.1016/j.jmrt.2024.08.201","DOIUrl":"https://doi.org/10.1016/j.jmrt.2024.08.201","url":null,"abstract":"This paper investigated the influence of ultraviolet (UV) illumination on the corrosion behavior of 7A04 aluminum alloy in 3.5% NaCl solutions with various pH values (, 7.0, and 10.0) using weight loss measurement, electrochemical methods, and surface analysis techniques. The research results indicated that the corrosion products of 7A04 alloy in salt solutions with different pH values all exhibited n-type semiconductor properties and could trigger the photovoltaic effect under UV illumination. Simultaneously, UV illumination reduced the compactness of the corrosion products, inhibited the enrichment of copper compounds (CuO), and promoted the generation of hydroxyl radicals in the solution. Therefore, UV illumination significantly accelerated the corrosion process of 7A04 alloy, with the overall acceleration effect ranking as follows: alkaline > neutral > acidic. In addition, the corrosion mechanism of 7A04 alloy in the test solutions with and without UV illumination was also discussed in this paper.","PeriodicalId":501120,"journal":{"name":"Journal of Materials Research and Technology","volume":"9 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142179998","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 corrosion of molten aluminium on components in the aluminium industry poses a significant bottleneck, hindering the development of aluminium products and equipment. This study focused on the Fe–Cr–B–Mo alloy, addressing challenges related to the susceptibility of the matrix to corrosion, the excessive brittleness of MB borides (M = Fe, Cr, etc.), and the detachment of corrosion products. A comprehensive study was performed to study the microstructure evolution, mechanical properties, and corrosion behavior of Fe–Cr–B–Mo alloy, considering the 'Divide and Conquer' strategy for Ti regulation. The findings indicate that the heterogeneous nucleation, induced by in situ TiB particles, significantly impacts the refinement of MB borides size and enhances the matrix strength. Notably, the addition of 4.5 wt. % Ti to the T3 alloy significantly enhances its mechanical properties and corrosion resistance. The T3 alloy exhibits an impact toughness of 32.4 kJ/m and a compressive fracture strain of 19.5 %, representing a considerable increase of 58 % and 167 % over the Ti-free alloy, respectively. Furthermore, the alloy has a volume loss rate of 11.0 mm cm h, which is substantially lower, by 73.5 % compared to H13 steel and by 21.4 % compared to the Ti-free alloy. The synergistic presence of TiB and MB borides, along with their corrosion products, functions as an effective diffusion barrier against molten aluminium corrosion.
熔融铝对铝工业部件的腐蚀是一个重大瓶颈，阻碍了铝产品和设备的发展。本研究以 Fe-Cr-B-Mo 合金为重点，解决了基体易腐蚀、MB 硼化物（M = Fe、Cr 等）脆性过大以及腐蚀产物脱落等相关难题。考虑到 Ti 调节的 "分而治之 "策略，对 Fe-Cr-B-Mo 合金的微观结构演变、机械性能和腐蚀行为进行了全面研究。研究结果表明，原位 TiB 颗粒诱导的异质成核显著影响了 MB 硼化物尺寸的细化，并增强了基体强度。值得注意的是，在 T3 合金中添加 4.5 重量%的 Ti 能显著提高其机械性能和耐腐蚀性。T3 合金的冲击韧性为 32.4 kJ/m，压缩断裂应变为 19.5%，与不含 Ti 的合金相比，分别提高了 58% 和 167%。此外，该合金的体积损失率为 11.0 mm cm h，与 H13 钢相比大幅降低了 73.5%，与无钛合金相比降低了 21.4%。TiB 和 MB 硼化物及其腐蚀产物的协同存在可作为防止铝熔体腐蚀的有效扩散屏障。
{"title":"Enhancing mechanical properties and corrosion resistance of Fe–Cr–B–Mo alloy via the 'Divide and Conquer' strategy for Ti regulation","authors":"Zicheng Ling, Wenguang Yang, Xingxing Wang, Xianman Zhang, Junyi Jiang, Zenglei Ni, Jin Peng, Zhipeng Yuan, Jianjun Shi, Weiping Chen","doi":"10.1016/j.jmrt.2024.08.149","DOIUrl":"https://doi.org/10.1016/j.jmrt.2024.08.149","url":null,"abstract":"The corrosion of molten aluminium on components in the aluminium industry poses a significant bottleneck, hindering the development of aluminium products and equipment. This study focused on the Fe–Cr–B–Mo alloy, addressing challenges related to the susceptibility of the matrix to corrosion, the excessive brittleness of MB borides (M = Fe, Cr, etc.), and the detachment of corrosion products. A comprehensive study was performed to study the microstructure evolution, mechanical properties, and corrosion behavior of Fe–Cr–B–Mo alloy, considering the 'Divide and Conquer' strategy for Ti regulation. The findings indicate that the heterogeneous nucleation, induced by in situ TiB particles, significantly impacts the refinement of MB borides size and enhances the matrix strength. Notably, the addition of 4.5 wt. % Ti to the T3 alloy significantly enhances its mechanical properties and corrosion resistance. The T3 alloy exhibits an impact toughness of 32.4 kJ/m and a compressive fracture strain of 19.5 %, representing a considerable increase of 58 % and 167 % over the Ti-free alloy, respectively. Furthermore, the alloy has a volume loss rate of 11.0 mm cm h, which is substantially lower, by 73.5 % compared to H13 steel and by 21.4 % compared to the Ti-free alloy. The synergistic presence of TiB and MB borides, along with their corrosion products, functions as an effective diffusion barrier against molten aluminium corrosion.","PeriodicalId":501120,"journal":{"name":"Journal of Materials Research and Technology","volume":"15 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142180002","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 main challenge faced by spacecraft is the large temperature difference in its operating environment. Thermal control coatings prepared on spacecraft and instrument surfaces are currently the most efficient ways for heat dissipation and control. In this work, AlO-TiO composite coatings with different TiO contents were prepared on 7075-Al alloy substrate by supersonic plasma spraying technology. The microstructure, phase composition, mechanical properties, thermal control properties, and corrosion resistances of the coatings were investigated. The raw stock feeds were mainly composed of α-AlO and anatase TiO, but the coatings were mainly γ-AlO and rutile TiO. The average Vickers microhardness of the coatings decreased from 1198.9 to 810.4 HV with the increase of TiO contents, but the elastic modulus increased from 158.5 to 244.3 GPa. The thermal control properties of the coatings were promoted with the growth of TiO contents, and the absorptance increased from 27.1 to 89.2% with the emittance from 83.7 to 86.5%. The corrosion potential and corrosion resistance of the coating gradually increased with TiO content due to its gradually improved hydrophobicity. This work broadens the application boundary of AlO-TiO composite coating and provides an innovative idea for material selection of thermal control coatings.
航天器面临的主要挑战是其运行环境中的巨大温差。在航天器和仪器表面制备热控制涂层是目前最有效的散热和控制方法。本研究采用超音速等离子喷涂技术，在 7075-Al 合金基体上制备了不同 TiO 含量的 AlO-TiO 复合涂层。研究了涂层的微观结构、相组成、机械性能、热控制性能和耐腐蚀性能。原材料进料主要由 α-AlO 和锐钛矿型 TiO 组成，但涂层主要由 γ-AlO 和金红石型 TiO 组成。随着 TiO 含量的增加，涂层的平均维氏硬度从 1198.9 HV 降至 810.4 HV，但弹性模量从 158.5 GPa 增至 244.3 GPa。涂层的热控性能随着 TiO 含量的增加而提高，吸收率从 27.1% 提高到 89.2%，发射率从 83.7% 提高到 86.5%。由于 TiO 的疏水性逐渐提高，涂层的腐蚀电位和耐腐蚀性随 TiO 含量的增加而逐渐提高。这项研究拓宽了 AlO-TiO 复合涂层的应用范围，为热控涂层的材料选择提供了创新思路。
{"title":"Effect of TiO2 content on the thermal control properties of Al2O3-xTiO2 composite coatings prepared by supersonic plasma spraying technology","authors":"Xuewu Li, Hongyu Liu, Weiling Guo, Longlong Zhou, Qingxin Cui, Xiaofeng Deng, Wenxiang Shu, Tian Shi, Zhiguo Xing, Haidou Wang","doi":"10.1016/j.jmrt.2024.08.199","DOIUrl":"https://doi.org/10.1016/j.jmrt.2024.08.199","url":null,"abstract":"The main challenge faced by spacecraft is the large temperature difference in its operating environment. Thermal control coatings prepared on spacecraft and instrument surfaces are currently the most efficient ways for heat dissipation and control. In this work, AlO-TiO composite coatings with different TiO contents were prepared on 7075-Al alloy substrate by supersonic plasma spraying technology. The microstructure, phase composition, mechanical properties, thermal control properties, and corrosion resistances of the coatings were investigated. The raw stock feeds were mainly composed of α-AlO and anatase TiO, but the coatings were mainly γ-AlO and rutile TiO. The average Vickers microhardness of the coatings decreased from 1198.9 to 810.4 HV with the increase of TiO contents, but the elastic modulus increased from 158.5 to 244.3 GPa. The thermal control properties of the coatings were promoted with the growth of TiO contents, and the absorptance increased from 27.1 to 89.2% with the emittance from 83.7 to 86.5%. The corrosion potential and corrosion resistance of the coating gradually increased with TiO content due to its gradually improved hydrophobicity. This work broadens the application boundary of AlO-TiO composite coating and provides an innovative idea for material selection of thermal control coatings.","PeriodicalId":501120,"journal":{"name":"Journal of Materials Research and Technology","volume":"12 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142180001","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 : 2024-08-30DOI: 10.1016/j.jmrt.2024.08.184
Jinghua Zhang, Hongyan Lv, Shuaifei Yan, Rui-dong Fu, Yi-jun Li
The microstructures and cryogenic mechanical properties of dissimilar friction stir welding (FSW) joints between nitrogen-alloyed CoCrFeMnNi high-entropy alloys (HEAs) and Fe–32.1Mn–7.5Cr–0.6Mo–1.2 N steel were investigated. The results reveal that defect-free dissimilar joints can be achieved through FSW. Furthermore, the grains of nitrogen-alloyed CoCrFeMnNi HEAs in the stir zone of the dissimilar joint are significantly more refined than those of Fe–32.1Mn–7.5Cr–0.6Mo–1.2 N steel. Joint efficiency at room and low temperature both exceed 90% of the base metal. Moreover, the cryogenic yield and ultimate strength of the dissimilar joints are higher than those recorded at room temperature. The fracture position is at the heat-affected zone of HEAs under two temperature conditions.
研究了氮合金钴铬铁镍高熵合金（HEAs）和铁-32.1Mn-7.5Cr-0.6Mo-1.2 N 钢之间异种搅拌摩擦焊（FSW）接头的微观结构和低温力学性能。结果表明，通过 FSW 可以实现无缺陷异种接头。此外，与 Fe-32.1Mn-7.5Cr-0.6Mo-1.2 N 钢相比，氮合金 CoCrFeMnNi HEAs 在异种接头搅拌区的晶粒明显更加细化。室温和低温下的接头效率均超过母材的 90%。此外，异种接头的低温屈服强度和极限强度均高于室温下的记录。在两种温度条件下，断裂位置都在 HEA 的热影响区。
{"title":"Microstructure and cryogenic mechanical properties of dissimilar friction stir welding joints between nitrogen-alloyed CoCrFeMnNi high-entropy alloy and high-manganese austenite steel","authors":"Jinghua Zhang, Hongyan Lv, Shuaifei Yan, Rui-dong Fu, Yi-jun Li","doi":"10.1016/j.jmrt.2024.08.184","DOIUrl":"https://doi.org/10.1016/j.jmrt.2024.08.184","url":null,"abstract":"The microstructures and cryogenic mechanical properties of dissimilar friction stir welding (FSW) joints between nitrogen-alloyed CoCrFeMnNi high-entropy alloys (HEAs) and Fe–32.1Mn–7.5Cr–0.6Mo–1.2 N steel were investigated. The results reveal that defect-free dissimilar joints can be achieved through FSW. Furthermore, the grains of nitrogen-alloyed CoCrFeMnNi HEAs in the stir zone of the dissimilar joint are significantly more refined than those of Fe–32.1Mn–7.5Cr–0.6Mo–1.2 N steel. Joint efficiency at room and low temperature both exceed 90% of the base metal. Moreover, the cryogenic yield and ultimate strength of the dissimilar joints are higher than those recorded at room temperature. The fracture position is at the heat-affected zone of HEAs under two temperature conditions.","PeriodicalId":501120,"journal":{"name":"Journal of Materials Research and Technology","volume":"110 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142180005","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 study explores the ballistic impact performance of shear thickening fluid (STF) impregnated sisal fabric panels with varying nano silica loadings (10 wt%, 20 wt%, and 30 wt%). Rheological analysis indicated improved shear thickening behavior with increased nano-silica. FESEM, XRD, and FTIR analyses were conducted to assess changes in morphology, phase structure, and functional groups. The yarn pull-out test showed a higher pull-out force for STF-impregnated fabrics, with 30 wt% STF demonstrating the highest pull-out speed. Ballistic impact tests revealed significant improvements in energy absorption for STF-impregnated fabrics compared to neat fabrics, with energy absorption enhancements of 4.40% for 10 wt%, 45.09% for 20 wt%, and 50.17% for 30 wt%. The increased nano-silica loading resulted in greater energy absorption, attributed to enhanced inter-yarn friction and improved fabric integrity.
{"title":"Ballistic impact behavior of shear thickening fluid impregnated sisal fabrics","authors":"Anand Biradar, Jayakrishna Kandasamy, Arulvel S, J. Naveen, Sanjay Mavinkere Rangappa, Suchart Siengchin","doi":"10.1016/j.jmrt.2024.08.178","DOIUrl":"https://doi.org/10.1016/j.jmrt.2024.08.178","url":null,"abstract":"The study explores the ballistic impact performance of shear thickening fluid (STF) impregnated sisal fabric panels with varying nano silica loadings (10 wt%, 20 wt%, and 30 wt%). Rheological analysis indicated improved shear thickening behavior with increased nano-silica. FESEM, XRD, and FTIR analyses were conducted to assess changes in morphology, phase structure, and functional groups. The yarn pull-out test showed a higher pull-out force for STF-impregnated fabrics, with 30 wt% STF demonstrating the highest pull-out speed. Ballistic impact tests revealed significant improvements in energy absorption for STF-impregnated fabrics compared to neat fabrics, with energy absorption enhancements of 4.40% for 10 wt%, 45.09% for 20 wt%, and 50.17% for 30 wt%. The increased nano-silica loading resulted in greater energy absorption, attributed to enhanced inter-yarn friction and improved fabric integrity.","PeriodicalId":501120,"journal":{"name":"Journal of Materials Research and Technology","volume":"83 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142180006","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 : 2024-08-30DOI: 10.1016/j.jmrt.2024.08.187
Jiankun Wang, Lin Chen, Gang Wang, Shixian Zhao, Bo Yuan, Hongxia Li, Xunlei Chen, Baihui Li, Luyang Zhang, Jing Feng
Working temperatures, thermal insulation performance, and life span of thermal barrier coatings (TBCs) are primarily influenced by their high-temperature stability, thermal expansion coefficients (TECs), thermal conductivity, and fracture toughness. To address the limitations of current zirconate- and tantalate-based oxides, dual-phase zirconate/tantalate high-entropy ceramics (HECs) are designed and synthesized to improve their thermal and mechanical properties. The combined effects of high entropy, high concentrations of oxygen vacancies, and relatively low phonon velocity result in glass-like thermal conductivity, with a minimum value of 1.55 W m K at 1200 °C. The high TECs (10.6–10.9 × 10 K at 1400 °C) and exceptional high-temperature stability demonstrate that these materials can withstand 1300 °C for more than 300 h, significantly surpassing the performance of traditional yttria-stabilized zirconia (YSZ). Compared with YSZ (3.6 MPa m) and YTaO (2.5 MPa m), the increments in fracture toughness (4.4 MPa m) of dual-phase zirconate/tantalate HECs are as high as 22.2% and 76.0%, respectively. It is evident that the designed dual-phase zirconate/tantalate HECs can effectively promote thermal properties and fracture toughness, positioning them as the next-generation TBCs with high operating temperatures and outstanding thermal insulation performance.
{"title":"Dual-phase zirconate/tantalate high-entropy ceramics boost thermal properties and fracture toughness for thermal barrier coating materials","authors":"Jiankun Wang, Lin Chen, Gang Wang, Shixian Zhao, Bo Yuan, Hongxia Li, Xunlei Chen, Baihui Li, Luyang Zhang, Jing Feng","doi":"10.1016/j.jmrt.2024.08.187","DOIUrl":"https://doi.org/10.1016/j.jmrt.2024.08.187","url":null,"abstract":"Working temperatures, thermal insulation performance, and life span of thermal barrier coatings (TBCs) are primarily influenced by their high-temperature stability, thermal expansion coefficients (TECs), thermal conductivity, and fracture toughness. To address the limitations of current zirconate- and tantalate-based oxides, dual-phase zirconate/tantalate high-entropy ceramics (HECs) are designed and synthesized to improve their thermal and mechanical properties. The combined effects of high entropy, high concentrations of oxygen vacancies, and relatively low phonon velocity result in glass-like thermal conductivity, with a minimum value of 1.55 W m K at 1200 °C. The high TECs (10.6–10.9 × 10 K at 1400 °C) and exceptional high-temperature stability demonstrate that these materials can withstand 1300 °C for more than 300 h, significantly surpassing the performance of traditional yttria-stabilized zirconia (YSZ). Compared with YSZ (3.6 MPa m) and YTaO (2.5 MPa m), the increments in fracture toughness (4.4 MPa m) of dual-phase zirconate/tantalate HECs are as high as 22.2% and 76.0%, respectively. It is evident that the designed dual-phase zirconate/tantalate HECs can effectively promote thermal properties and fracture toughness, positioning them as the next-generation TBCs with high operating temperatures and outstanding thermal insulation performance.","PeriodicalId":501120,"journal":{"name":"Journal of Materials Research and Technology","volume":"83 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142179913","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 : 2024-08-30DOI: 10.1016/j.jmrt.2024.08.192
Yuhang Qiao, Rui Sun, Yong Yang, Shukun Liu, Xiaogang Wang
To reveal the microstructure forming mechanism of laser/ultra-high frequency (UHF) induction deposition, this paper developed a microscopic phase-field (PF) model to numerically investigate dendrite growth during solidification. The macroscopic model of molten pool evolution is adopted to provide the solidification conditions for the microscopic PF model. The dendrite growth during laser deposition is simulated to evaluate the effect of UHF induction heat on the dendrite growth. Results show that because of the high temperature gradient and cooling rate, the PDAS of laser-UHF induction hybrid deposited layer is less than that of the laser deposited layer. The UHF induction heat also leads to a high flow velocity of the molten metal during laser-UHF induction hybrid deposition. The high flow velocity contributes to the decrease in PDAS by inhibiting the interdendritic enrichment of solute. During laser-UHF induction hybrid deposition, a higher solute gradient is present in the tip region of dendrite arm, leading to a faster dendrite growth rate. The UHF induction heat also increases the solute distribution coefficient during deposition, which further inhibits the element segregation. Under the action of UHF induction heat, a low interdendritic solute gradient and an evenly distributed solute can be obtained, thus helping increase interdendritic undercooling degrees and decreasing the PDAS. The simulated PDAS and solute distribution have good consistency with the experimental results. The spectral analysis of EDS line detection indicates that the laser-UHF induction hybrid deposited layer has a more refined microstructure and weaker element segregation than the laser deposited layer does.
{"title":"Microstructure forming mechanism of inconel 625 alloy fabricated by laser/ultra-high (UHF) induction hybrid deposition method","authors":"Yuhang Qiao, Rui Sun, Yong Yang, Shukun Liu, Xiaogang Wang","doi":"10.1016/j.jmrt.2024.08.192","DOIUrl":"https://doi.org/10.1016/j.jmrt.2024.08.192","url":null,"abstract":"To reveal the microstructure forming mechanism of laser/ultra-high frequency (UHF) induction deposition, this paper developed a microscopic phase-field (PF) model to numerically investigate dendrite growth during solidification. The macroscopic model of molten pool evolution is adopted to provide the solidification conditions for the microscopic PF model. The dendrite growth during laser deposition is simulated to evaluate the effect of UHF induction heat on the dendrite growth. Results show that because of the high temperature gradient and cooling rate, the PDAS of laser-UHF induction hybrid deposited layer is less than that of the laser deposited layer. The UHF induction heat also leads to a high flow velocity of the molten metal during laser-UHF induction hybrid deposition. The high flow velocity contributes to the decrease in PDAS by inhibiting the interdendritic enrichment of solute. During laser-UHF induction hybrid deposition, a higher solute gradient is present in the tip region of dendrite arm, leading to a faster dendrite growth rate. The UHF induction heat also increases the solute distribution coefficient during deposition, which further inhibits the element segregation. Under the action of UHF induction heat, a low interdendritic solute gradient and an evenly distributed solute can be obtained, thus helping increase interdendritic undercooling degrees and decreasing the PDAS. The simulated PDAS and solute distribution have good consistency with the experimental results. The spectral analysis of EDS line detection indicates that the laser-UHF induction hybrid deposited layer has a more refined microstructure and weaker element segregation than the laser deposited layer does.","PeriodicalId":501120,"journal":{"name":"Journal of Materials Research and Technology","volume":"2016 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142179914","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 : 2024-08-30DOI: 10.1016/j.jmrt.2024.08.186
Minghao Yin, Tianju Chen, Ping Liu, Xun Ma, Shirui Zhou, Li Shen, Shuangyuan Wang, Wei Li
Nowadays there has been a substantial escalation in the consumption of the global annual mortality rate due to cardiovascular and cerebrovascular diseases, and the traditional stainless-steel materials used for interventional treatments are sometimes unsuitable for thinner vascular walls. Hence it is imperative to undertake a comprehensive analysis of novel materials in the field of vascular intervention, and NiTi alloys are one of the best materials among them. NiTi alloys are the shape-memory alloys that undergo a phase transformation under certain temperatures and pressures. Owing to its shape memory effect and superelastic properties, it is extensively utilized in the medical filed, representing a future direction for smart materials. As the field of medical intervention evolves, the advantages of NiTi alloys in vascular interventional medical devices are increasingly recognized due to their superior performance, garnering widespread attention. As a result, analyzing their medical applications is required in order to promote interdisciplinary integration. This review summarizes the structural properties, preparation methods, and application areas of NiTi alloys as medical devices for vascular interventions. It also analyzes the properties of NiTi alloys when used as stents or guidewires in specific scenarios, and discusses the current shortcomings, future development directions and application prospects.
{"title":"Application and progress of NiTi alloys in vascular interventional medical devices","authors":"Minghao Yin, Tianju Chen, Ping Liu, Xun Ma, Shirui Zhou, Li Shen, Shuangyuan Wang, Wei Li","doi":"10.1016/j.jmrt.2024.08.186","DOIUrl":"https://doi.org/10.1016/j.jmrt.2024.08.186","url":null,"abstract":"Nowadays there has been a substantial escalation in the consumption of the global annual mortality rate due to cardiovascular and cerebrovascular diseases, and the traditional stainless-steel materials used for interventional treatments are sometimes unsuitable for thinner vascular walls. Hence it is imperative to undertake a comprehensive analysis of novel materials in the field of vascular intervention, and NiTi alloys are one of the best materials among them. NiTi alloys are the shape-memory alloys that undergo a phase transformation under certain temperatures and pressures. Owing to its shape memory effect and superelastic properties, it is extensively utilized in the medical filed, representing a future direction for smart materials. As the field of medical intervention evolves, the advantages of NiTi alloys in vascular interventional medical devices are increasingly recognized due to their superior performance, garnering widespread attention. As a result, analyzing their medical applications is required in order to promote interdisciplinary integration. This review summarizes the structural properties, preparation methods, and application areas of NiTi alloys as medical devices for vascular interventions. It also analyzes the properties of NiTi alloys when used as stents or guidewires in specific scenarios, and discusses the current shortcomings, future development directions and application prospects.","PeriodicalId":501120,"journal":{"name":"Journal of Materials Research and Technology","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142180003","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 : 2024-08-19DOI: 10.1016/j.jmrt.2024.08.095
Yu Feng, Zhe Zhang, Dong Yue, Victor O. Belko, Sergey A. Maksimenko, Jun Deng, Yong Sun, Zhou Yang, Qiang Fu, Baixin Liu, Qingguo Chen
Epoxy resin is widely used in electrical equipment and electronic devices fields due to its excellent electrical, thermal, and mechanical properties. However, its internal three-dimensional covalent interconnection structure brings barriers to its degradability and recycling because covalent bonds cannot be broken easily. With the replacements of power equipment and electronic devices, there will be more and more epoxy resins and their composites in them to be treated and effective recycling is of great significance for resource conservation and environmental protection. In this review article, recent progress in degradation and recycling of epoxy resin is introduced and the effect of three traditional degradation methods is discussed. The drawbacks of these methods are thought to come from the intrinsic properties of these epoxy resins. So the urgency of developing new kinds of degradable epoxy resins is proposed. Then different types of new degradable epoxy resins are reviewed. Degradation mechanisms of the opened-loop recycling and recycling methods of the closed-loop recycling are summarized in detail. Finally, the challenges and perspectives are discussed based on their current developments. This review comprehensively considers both traditional degradation methods and new methods for developing degradable epoxy resins. It covers not only an overview of the state-of-the-art advances of degradation and recycling of epoxy resin but also the prospects that provide reference for the synthesis of degradable epoxy resin materials.
{"title":"Recent progress in degradation and recycling of epoxy resin","authors":"Yu Feng, Zhe Zhang, Dong Yue, Victor O. Belko, Sergey A. Maksimenko, Jun Deng, Yong Sun, Zhou Yang, Qiang Fu, Baixin Liu, Qingguo Chen","doi":"10.1016/j.jmrt.2024.08.095","DOIUrl":"https://doi.org/10.1016/j.jmrt.2024.08.095","url":null,"abstract":"Epoxy resin is widely used in electrical equipment and electronic devices fields due to its excellent electrical, thermal, and mechanical properties. However, its internal three-dimensional covalent interconnection structure brings barriers to its degradability and recycling because covalent bonds cannot be broken easily. With the replacements of power equipment and electronic devices, there will be more and more epoxy resins and their composites in them to be treated and effective recycling is of great significance for resource conservation and environmental protection. In this review article, recent progress in degradation and recycling of epoxy resin is introduced and the effect of three traditional degradation methods is discussed. The drawbacks of these methods are thought to come from the intrinsic properties of these epoxy resins. So the urgency of developing new kinds of degradable epoxy resins is proposed. Then different types of new degradable epoxy resins are reviewed. Degradation mechanisms of the opened-loop recycling and recycling methods of the closed-loop recycling are summarized in detail. Finally, the challenges and perspectives are discussed based on their current developments. This review comprehensively considers both traditional degradation methods and new methods for developing degradable epoxy resins. It covers not only an overview of the state-of-the-art advances of degradation and recycling of epoxy resin but also the prospects that provide reference for the synthesis of degradable epoxy resin materials.","PeriodicalId":501120,"journal":{"name":"Journal of Materials Research and Technology","volume":"38 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-08-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142823423","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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