Pub Date : 2024-10-22DOI: 10.1016/j.scriptamat.2024.116408
{"title":"Recipients of the 2023 Acta Materialia, inc. student awards","authors":"","doi":"10.1016/j.scriptamat.2024.116408","DOIUrl":"10.1016/j.scriptamat.2024.116408","url":null,"abstract":"","PeriodicalId":423,"journal":{"name":"Scripta Materialia","volume":"256 ","pages":"Article 116408"},"PeriodicalIF":5.3,"publicationDate":"2024-10-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142663688","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}
Pub Date : 2024-10-21DOI: 10.1016/j.scriptamat.2024.116412
Heqing Zhang , Changjiang Zhang , Xiaojian Liang , Ruipeng Guo , Hong Feng , Zhaoping Hou , Jianchao Han , Min Cheng , Shuzhi Zhang , Tao Wang , Peng Cao
Near-α high-temperature titanium alloys suffer from low ductility due to silicide and α2 (Ti3Al) precipitates. This study explores how adjusting the Al/Zr ratio affects these precipitates and their impact on ductility. Dispersed silicide precipitates activate the pyramidal 〈c + a〉 slip systems, enhancing ductility by limiting basal 〈a〉 slip. Conversely, α2 nanoparticles promote basal 〈a〉 slip, resulting in planar dislocations and reduced ductility. These findings offer a new strategy for balancing strength and ductility in near-α high-temperature titanium alloys through controlled precipitation.
{"title":"Plastic slip mechanisms in high-temperature titanium alloys: Insights into silicide and Ti3Al precipitates on ductility","authors":"Heqing Zhang , Changjiang Zhang , Xiaojian Liang , Ruipeng Guo , Hong Feng , Zhaoping Hou , Jianchao Han , Min Cheng , Shuzhi Zhang , Tao Wang , Peng Cao","doi":"10.1016/j.scriptamat.2024.116412","DOIUrl":"10.1016/j.scriptamat.2024.116412","url":null,"abstract":"<div><div>Near-α high-temperature titanium alloys suffer from low ductility due to silicide and α<sub>2</sub> (Ti<sub>3</sub>Al) precipitates. This study explores how adjusting the Al/Zr ratio affects these precipitates and their impact on ductility. Dispersed silicide precipitates activate the pyramidal 〈<em>c</em> + <em>a</em>〉 slip systems, enhancing ductility by limiting basal 〈<em>a</em>〉 slip. Conversely, α<sub>2</sub> nanoparticles promote basal 〈<em>a</em>〉 slip, resulting in planar dislocations and reduced ductility. These findings offer a new strategy for balancing strength and ductility in near-α high-temperature titanium alloys through controlled precipitation.</div></div>","PeriodicalId":423,"journal":{"name":"Scripta Materialia","volume":"256 ","pages":"Article 116412"},"PeriodicalIF":5.3,"publicationDate":"2024-10-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142536306","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}
Pub Date : 2024-10-19DOI: 10.1016/j.scriptamat.2024.116418
Yifan Yang, Jing Geng, Yunwei Cao, Li Fan, Bo Shi
Metallic glasses (MGs) have multiple dynamic relaxation modes, among which α and β relaxations are two typical modes. The rejuvenation of MGs usually refers to the increase in the total enthalpy of structural relaxation. However, the control mechanism of single-mode relaxation and the contributions of different relaxation modes to the total enthalpy are still unclear. We investigated the effects of stress, temperature and their coupling fields on α and β relaxations through experimental and molecular dynamics (MD) simulations. We found that the temperature field activated more sites for β relaxation, while the prolonged stress leads to the aggregations and connections of a quantity of localized atomic clusters and even activates α relaxation. The coupled field integrates the characteristics of stress and temperature fields and results in a clear splitting of α and β relaxations. Our work provides useful insights into the single-mode regulation of α and β relaxations in MGs.
{"title":"Rejuvenation of La-based metallic glass by controlling different modes of relaxation","authors":"Yifan Yang, Jing Geng, Yunwei Cao, Li Fan, Bo Shi","doi":"10.1016/j.scriptamat.2024.116418","DOIUrl":"10.1016/j.scriptamat.2024.116418","url":null,"abstract":"<div><div>Metallic glasses (MGs) have multiple dynamic relaxation modes, among which <em>α</em> and <em>β</em> relaxations are two typical modes. The rejuvenation of MGs usually refers to the increase in the total enthalpy of structural relaxation. However, the control mechanism of single-mode relaxation and the contributions of different relaxation modes to the total enthalpy are still unclear. We investigated the effects of stress, temperature and their coupling fields on <em>α</em> and <em>β</em> relaxations through experimental and molecular dynamics (MD) simulations. We found that the temperature field activated more sites for <em>β</em> relaxation, while the prolonged stress leads to the aggregations and connections of a quantity of localized atomic clusters and even activates <em>α</em> relaxation. The coupled field integrates the characteristics of stress and temperature fields and results in a clear splitting of <em>α</em> and <em>β</em> relaxations. Our work provides useful insights into the single-mode regulation of <em>α</em> and <em>β</em> relaxations in MGs.</div></div>","PeriodicalId":423,"journal":{"name":"Scripta Materialia","volume":"256 ","pages":"Article 116418"},"PeriodicalIF":5.3,"publicationDate":"2024-10-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142536305","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}
Pub Date : 2024-10-17DOI: 10.1016/j.scriptamat.2024.116414
Julian N. Ebert , Dylan Jennings , Olivier Guillon , Wolfgang Rheinheimer
Acceptor-doped BaZrO3, a ceramic proton conductor, is well researched for use in solid oxide fuel cells due to its proton conductivity and chemical stability. A major drawback of the material is the difficulty of sintering as it requires high sintering temperatures and long heating times (> 1600 °C, 24 h). An emerging sintering technology to mitigate this challenge is blacklight sintering, which uses a high-powered blue or UV light source to heat ceramics extremely fast leading to short sintering times and reduced energy demand. In this work, BaZr0.8Y0.2O3-δ (BZY20) and BaZr0.8Y0.1Sc0.1O3-δ (BZY10Sc10) were blacklight-sintered with a high-power blue laser in under four minutes. Even though the resulting samples have a gradient from large to small grains and structurally disordered grain boundaries, the proton conductivity is comparable to conventionally sintered samples. Hence, blacklight sintering is a promising technology with the potential to sinter BaZrO3 much faster, while saving energy.
{"title":"Blacklight sintering of BaZrO3-based proton conductors","authors":"Julian N. Ebert , Dylan Jennings , Olivier Guillon , Wolfgang Rheinheimer","doi":"10.1016/j.scriptamat.2024.116414","DOIUrl":"10.1016/j.scriptamat.2024.116414","url":null,"abstract":"<div><div>Acceptor-doped BaZrO<sub>3</sub>, a ceramic proton conductor, is well researched for use in solid oxide fuel cells due to its proton conductivity and chemical stability. A major drawback of the material is the difficulty of sintering as it requires high sintering temperatures and long heating times (> 1600 °C, 24 h). An emerging sintering technology to mitigate this challenge is blacklight sintering, which uses a high-powered blue or UV light source to heat ceramics extremely fast leading to short sintering times and reduced energy demand. In this work, BaZr<sub>0.8</sub>Y<sub>0.2</sub>O<sub>3-δ</sub> (BZY20) and BaZr<sub>0.8</sub>Y<sub>0.1</sub>Sc<sub>0.1</sub>O<sub>3-δ</sub> (BZY10Sc10) were blacklight-sintered with a high-power blue laser in under four minutes. Even though the resulting samples have a gradient from large to small grains and structurally disordered grain boundaries, the proton conductivity is comparable to conventionally sintered samples. Hence, blacklight sintering is a promising technology with the potential to sinter BaZrO<sub>3</sub> much faster, while saving energy.</div></div>","PeriodicalId":423,"journal":{"name":"Scripta Materialia","volume":"256 ","pages":"Article 116414"},"PeriodicalIF":5.3,"publicationDate":"2024-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142446415","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}
Pub Date : 2024-10-17DOI: 10.1016/j.scriptamat.2024.116415
Rikesh Patel, Wenqi Li, Richard J. Smith, Matt Clark
Rapid measurement of crystal orientation is critical in the materials discovery process as it facilitates real-time decision-making and quality control. Acoustic inspection methods rapidly characterise microstructure without the need for extensive infrastructure or expense – the laser ultrasonic method known as Spatially Resolved Acoustic Spectroscopy (SRAS) has been developed with this intent and accurately characterises crystal orientation by leveraging a combination of forward modelling and an exhaustive brute force process to obtain the best-fit orientation. While effective, this method is computationally demanding and time-intensive. We introduce a novel approach that utilises neural networks to classify measured acoustic signals into orientation planes to significantly expedite the characterisation process and demonstrate classification on real-world Inconel 617 and CMX4 specimens. A reduction in the orientation determination time from around 10 hours (brute force search) down to 15 seconds (neural network) was achieved while exhibiting an average plane angle difference of between 5.3∘ and 13.8∘.
{"title":"Developing neural networks to rapidly map crystallographic orientation using laser ultrasound measurements","authors":"Rikesh Patel, Wenqi Li, Richard J. Smith, Matt Clark","doi":"10.1016/j.scriptamat.2024.116415","DOIUrl":"10.1016/j.scriptamat.2024.116415","url":null,"abstract":"<div><div>Rapid measurement of crystal orientation is critical in the materials discovery process as it facilitates real-time decision-making and quality control. Acoustic inspection methods rapidly characterise microstructure without the need for extensive infrastructure or expense – the laser ultrasonic method known as Spatially Resolved Acoustic Spectroscopy (SRAS) has been developed with this intent and accurately characterises crystal orientation by leveraging a combination of forward modelling and an exhaustive brute force process to obtain the best-fit orientation. While effective, this method is computationally demanding and time-intensive. We introduce a novel approach that utilises neural networks to classify measured acoustic signals into orientation planes to significantly expedite the characterisation process and demonstrate classification on real-world Inconel 617 and CMX4 specimens. A reduction in the orientation determination time from around 10 hours (brute force search) down to 15 seconds (neural network) was achieved while exhibiting an average plane angle difference of between 5.3<sup>∘</sup> and 13.8<sup>∘</sup>.</div></div>","PeriodicalId":423,"journal":{"name":"Scripta Materialia","volume":"256 ","pages":"Article 116415"},"PeriodicalIF":5.3,"publicationDate":"2024-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142446416","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}
Pub Date : 2024-10-15DOI: 10.1016/j.scriptamat.2024.116405
Cheng-Ling Tai , Jhen-De You , Jia-Jun Chen , Shu-Cheng Liang , Tsai-Fu Chung , Yo-Lun Yang , Seiichiro Ii , Takahito Ohmura , Xiaoyang Zheng , Chih-Yuan Chen , Jer-Ren Yang
CoCrNi and CoCrNiSi0.3 nanopillars exhibited distinct deformation behaviors under in-situ compression experiments with a strain rate of 2 × 10–3 s-1 in a transmission electron microscope. The former was mainly deformed through slip-dislocations and the formation of slip-bands with edges extending to the nanopillar's boundaries; in contrast, the latter was primarily deformed by twinning and partitioned by deformation nanotwins, with different variants intersecting each other to form closed nano-blocks. Si addition not only enhanced the solid solution strengthening effect but also facilitated the formation of nanotwins, resulting in a delayed first strain burst in the CoCrNiSi0.3 nanopillar at a strain of 9.6 % with strength 39 % higher than that in CoCrNi at a strain of 7.1 % during the in-situ deformation. In addition, closed nano-blocks effectively strengthened the CoCrNiSi0.3 nanopillar, which possessed strength 24 % higher than that of the CoCrNi nanopillar at the same strain of ∼20 %.
{"title":"In-situ transmission electron microscopy investigation of the deformation mechanism in CoCrNi and CoCrNiSi0.3 nanopillars","authors":"Cheng-Ling Tai , Jhen-De You , Jia-Jun Chen , Shu-Cheng Liang , Tsai-Fu Chung , Yo-Lun Yang , Seiichiro Ii , Takahito Ohmura , Xiaoyang Zheng , Chih-Yuan Chen , Jer-Ren Yang","doi":"10.1016/j.scriptamat.2024.116405","DOIUrl":"10.1016/j.scriptamat.2024.116405","url":null,"abstract":"<div><div>CoCrNi and CoCrNiSi<sub>0.3</sub> nanopillars exhibited distinct deformation behaviors under in-situ compression experiments with a strain rate of 2 × 10<sup>–3</sup> s<sup>-1</sup> in a transmission electron microscope. The former was mainly deformed through slip-dislocations and the formation of slip-bands with edges extending to the nanopillar's boundaries; in contrast, the latter was primarily deformed by twinning and partitioned by deformation nanotwins, with different variants intersecting each other to form closed nano-blocks. Si addition not only enhanced the solid solution strengthening effect but also facilitated the formation of nanotwins, resulting in a delayed first strain burst in the CoCrNiSi<sub>0.3</sub> nanopillar at a strain of 9.6 % with strength 39 % higher than that in CoCrNi at a strain of 7.1 % during the in-situ deformation. In addition, closed nano-blocks effectively strengthened the CoCrNiSi<sub>0.3</sub> nanopillar, which possessed strength 24 % higher than that of the CoCrNi nanopillar at the same strain of ∼20 %.</div></div>","PeriodicalId":423,"journal":{"name":"Scripta Materialia","volume":"255 ","pages":"Article 116405"},"PeriodicalIF":5.3,"publicationDate":"2024-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142432037","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}
Pub Date : 2024-10-15DOI: 10.1016/j.scriptamat.2024.116407
Gyu-Jang Sim , Myoung-Gyu Lee , Marat I. Latypov
High-cycle fatigue is a critical performance metric of structural alloys for many applications. The high cost, time, and labor involved in experimental fatigue testing call for efficient and accurate computer models of fatigue life. We present FIP-GNN – a graph neural network for polycrystals that (i) predicts fatigue indicator parameters as grain-level inelastic responses to cyclic loading quantifying the local driving force for crack initiation and (ii) generalizes these predictions to large microstructure volume elements with grain populations well beyond those used in training. These advances can make significant contributions to statistically rigorous and computationally efficient modeling of high-cycle fatigue – a long-standing challenge in the field.
{"title":"FIP-GNN: Graph neural networks for scalable prediction of grain-level fatigue indicator parameters","authors":"Gyu-Jang Sim , Myoung-Gyu Lee , Marat I. Latypov","doi":"10.1016/j.scriptamat.2024.116407","DOIUrl":"10.1016/j.scriptamat.2024.116407","url":null,"abstract":"<div><div>High-cycle fatigue is a critical performance metric of structural alloys for many applications. The high cost, time, and labor involved in experimental fatigue testing call for efficient and accurate computer models of fatigue life. We present FIP-GNN – a graph neural network for polycrystals that (i) predicts fatigue indicator parameters as grain-level inelastic responses to cyclic loading quantifying the local driving force for crack initiation and (ii) generalizes these predictions to large microstructure volume elements with grain populations well beyond those used in training. These advances can make significant contributions to statistically rigorous and computationally efficient modeling of high-cycle fatigue – a long-standing challenge in the field.</div></div>","PeriodicalId":423,"journal":{"name":"Scripta Materialia","volume":"255 ","pages":"Article 116407"},"PeriodicalIF":5.3,"publicationDate":"2024-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142437808","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}
Pub Date : 2024-10-14DOI: 10.1016/j.scriptamat.2024.116411
Carolina Frey , Benjamin Neuman , Anthony Botros , Sebastian A. Kube , Tresa.M. Pollock
Ru-based B2 phases have shown promise as strengthening precipitates in refractory alloys due to their high (≥ 1600 °C) solvus temperatures. Of the Ru-based B2 phases, the HfRu-B2 phase is the most thermally stable and a solution and ageable BCC + HfRu-B2 alloy has yet to be reported. Three HfRu-containing refractory alloys were arc-melted and their phase equilibria investigated from 1300-1900 °C: Ta30Mo28Nb22Hf11Ru9, Nb52Mo28Hf11Ru9, and Nb52V28Hf11Ru9 (at%). Scanning electron microscopy was used to characterize the microstructures after annealing. In all alloys, a HfRu-B2 phase was present as precipitates embedded in a disordered BCC phase. The HfRu-B2 phase was stable up to 1750 °C and additional Hf- and V-rich phases were stable at 1300 °C. After slow cooling, the HfRu-B2 precipitates in Nb52V28Hf11Ru9 evolved in morphology from spheres to cubes to cuboidal arrays with increasing aging time, characteristic of a low misfit between the HfRu-B2 and BCC phases.
{"title":"Refractory multi-principal element alloys with solution and aged HfRu-B2 precipitates","authors":"Carolina Frey , Benjamin Neuman , Anthony Botros , Sebastian A. Kube , Tresa.M. Pollock","doi":"10.1016/j.scriptamat.2024.116411","DOIUrl":"10.1016/j.scriptamat.2024.116411","url":null,"abstract":"<div><div>Ru-based B2 phases have shown promise as strengthening precipitates in refractory alloys due to their high (≥ 1600<!--> <!-->°C) solvus temperatures. Of the Ru-based B2 phases, the HfRu-B2 phase is the most thermally stable and a solution and ageable BCC + HfRu-B2 alloy has yet to be reported. Three HfRu-containing refractory alloys were arc-melted and their phase equilibria investigated from 1300-1900<!--> <!-->°C: Ta<sub>30</sub>Mo<sub>28</sub>Nb<sub>22</sub>Hf<sub>11</sub>Ru<sub>9</sub>, Nb<sub>52</sub>Mo<sub>28</sub>Hf<sub>11</sub>Ru<sub>9</sub>, and Nb<sub>52</sub>V<sub>28</sub>Hf<sub>11</sub>Ru<sub>9</sub> (at%). Scanning electron microscopy was used to characterize the microstructures after annealing. In all alloys, a HfRu-B2 phase was present as precipitates embedded in a disordered BCC phase. The HfRu-B2 phase was stable up to 1750<!--> <!-->°C and additional Hf- and V-rich phases were stable at 1300<!--> <!-->°C. After slow cooling, the HfRu-B2 precipitates in Nb<sub>52</sub>V<sub>28</sub>Hf<sub>11</sub>Ru<sub>9</sub> evolved in morphology from spheres to cubes to cuboidal arrays with increasing aging time, characteristic of a low misfit between the HfRu-B2 and BCC phases.</div></div>","PeriodicalId":423,"journal":{"name":"Scripta Materialia","volume":"255 ","pages":"Article 116411"},"PeriodicalIF":5.3,"publicationDate":"2024-10-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142432036","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}
Pub Date : 2024-10-13DOI: 10.1016/j.scriptamat.2024.116406
Hongyang Dai , Jiayi Huang , Shulan Zuo, Mingyao Hu, Lei Yang, Jinghua Liu, Chengbao Jiang
The maximum magnetic energy product ((BH)max) of 2:17-type SmCo magnets with low temperature coefficient (α), prepared by partially substituting Sm with heavy rare-earth elements (HREs), are lower than that of conventional magnets. Optimizing their magnetic properties by harnessing complementary advantages of different HREs is an effective approach that warrants further study. This study unveils an enhanced compensation effect of co-doping Gd and Dy elements in SmCo magnets, which becomes significant as the total content of Gd and Dy increases. Specifically, when the co-doping level of Gd and Dy reaches 10.3 wt%, there is a significant improvement of 71 % in (BH)max compared to doping with 10.3 wt% Dy alone, while maintaining a comparable α value. Microstructure and microchemistry analysis, along with first principles calculations reveal that this effect is closely associated with the enrichment of Dy in cell 2:17R phases. This finding holds significance for designing temperature-stable SmCo magnets.
通过用重稀土元素（HREs）部分替代 Sm 制备的具有低温度系数（α）的 2:17 型 SmCo 磁体的最大磁能积（(BH)max）低于传统磁体。通过利用不同 HRE 的互补优势来优化其磁性能是一种有效的方法，值得进一步研究。本研究揭示了在钐钴磁体中共同掺杂钆和镝元素的增强补偿效应，这种效应随着钆和镝总含量的增加而变得显著。具体来说，当 Gd 和 Dy 的共掺杂水平达到 10.3 wt% 时，与单独掺杂 10.3 wt% 的 Dy 相比，(BH)最大值显著提高了 71%，同时保持了相当的 α 值。微观结构和微观化学分析以及第一性原理计算显示，这种效果与电池 2:17R 相中镝的富集密切相关。这一发现对设计温度稳定的 SmCo 磁体具有重要意义。
{"title":"Enhanced compensation effect of Gd and Dy in 2:17-type SmCo magnets","authors":"Hongyang Dai , Jiayi Huang , Shulan Zuo, Mingyao Hu, Lei Yang, Jinghua Liu, Chengbao Jiang","doi":"10.1016/j.scriptamat.2024.116406","DOIUrl":"10.1016/j.scriptamat.2024.116406","url":null,"abstract":"<div><div>The maximum magnetic energy product ((<em>BH</em>)<sub>max</sub>) of 2:17-type SmCo magnets with low temperature coefficient (<em>α</em>), prepared by partially substituting Sm with heavy rare-earth elements (HREs), are lower than that of conventional magnets. Optimizing their magnetic properties by harnessing complementary advantages of different HREs is an effective approach that warrants further study. This study unveils an enhanced compensation effect of co-doping Gd and Dy elements in SmCo magnets, which becomes significant as the total content of Gd and Dy increases. Specifically, when the co-doping level of Gd and Dy reaches 10.3 wt%, there is a significant improvement of 71 % in (<em>BH</em>)<sub>max</sub> compared to doping with 10.3 wt% Dy alone, while maintaining a comparable <em>α</em> value. Microstructure and microchemistry analysis, along with first principles calculations reveal that this effect is closely associated with the enrichment of Dy in cell 2:17R phases. This finding holds significance for designing temperature-stable SmCo magnets.</div></div>","PeriodicalId":423,"journal":{"name":"Scripta Materialia","volume":"255 ","pages":""},"PeriodicalIF":5.3,"publicationDate":"2024-10-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142418086","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}
Pub Date : 2024-10-13DOI: 10.1016/j.scriptamat.2024.116409
Jiahui Wang , Xinbao Zhao , Fangjie You , Quanzhao Yue , Wanshun Xia , Yuefeng Gu , Ze Zhang
Using a cantilever high-temperature ultracentrifuge to simulate working conditions of engine turbine disk, this study systematically investigates the microstructural evolution of GH4169 superalloy under 50,000 g high gravity condition at 720 °C, 800 °C and 850 °C for 24 h, focusing on the nucleation and precipitation of δ phase. The results reveal that the alloy exhibits moderate suppression of nucleation and precipitation of δ phase under high gravity. The changes in the coarsening of γʹʹ phase makes δ phase lose its nucleation site and can't precipitate through the transformation from γʹʹ to δ phase. This research offers new insights and empirical support for superalloy applications and optimization under extreme conditions.
{"title":"Effects of high gravity on the nucleation and precipitation of δ phase of GH4169 alloy","authors":"Jiahui Wang , Xinbao Zhao , Fangjie You , Quanzhao Yue , Wanshun Xia , Yuefeng Gu , Ze Zhang","doi":"10.1016/j.scriptamat.2024.116409","DOIUrl":"10.1016/j.scriptamat.2024.116409","url":null,"abstract":"<div><div>Using a cantilever high-temperature ultracentrifuge to simulate working conditions of engine turbine disk, this study systematically investigates the microstructural evolution of GH4169 superalloy under 50,000 g high gravity condition at 720 °C, 800 °C and 850 °C for 24 h, focusing on the nucleation and precipitation of δ phase. The results reveal that the alloy exhibits moderate suppression of nucleation and precipitation of δ phase under high gravity. The changes in the coarsening of γʹʹ phase makes δ phase lose its nucleation site and can't precipitate through the transformation from γʹʹ to δ phase. This research offers new insights and empirical support for superalloy applications and optimization under extreme conditions.</div></div>","PeriodicalId":423,"journal":{"name":"Scripta Materialia","volume":"255 ","pages":"Article 116409"},"PeriodicalIF":5.3,"publicationDate":"2024-10-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142432035","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}
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