Pub Date : 2025-01-23DOI: 10.1016/j.jnoncrysol.2025.123407
Bowen Li , Guangkai Liao , Kaikai Cao , Zhenyan Xie , Bin Li , Zili Wang , Yuejun Liu
The creep behavior and micro-mechanisms of Zr41.2Ti13.8Cu12.5Ni10Be22.5 bulk metallic glass (Zr-BMG) were investigated at room temperature using nanoindentation technology under different loading rates and peak loads (holding loads). The creep stress was calculated using the work-of-indentation, the creep stress-time curve was fitted and analyzed by combining the Kohlrausch-Williams-Watts (KWW) equation, the activation volume formula, and the generalized Maxwell model, revealing the dynamic evolution of microstructural heterogeneity, flow units, relaxation time spectra, and activation energy spectra. The results show that as the peak load and loading rate increase, the stress drop magnitude increases, exhibiting a typical stress relaxation phenomenon. The activation energy is closely related to the internal microstructural heterogeneity, the more significant the microstructural heterogeneity, the lower the required activation energy, making flow units more easily activated. This study provides important experimental evidence and theoretical support for a deeper understanding of the creep behavior and micro-mechanical mechanisms of metallic glass.
{"title":"Microstructural heterogeneity evolution of Zr-based bulk metallic glass during nanoindentation creep","authors":"Bowen Li , Guangkai Liao , Kaikai Cao , Zhenyan Xie , Bin Li , Zili Wang , Yuejun Liu","doi":"10.1016/j.jnoncrysol.2025.123407","DOIUrl":"10.1016/j.jnoncrysol.2025.123407","url":null,"abstract":"<div><div>The creep behavior and micro-mechanisms of Zr<sub>41.2</sub>Ti<sub>13.8</sub>Cu<sub>12.5</sub>Ni<sub>10</sub>Be<sub>22.5</sub> bulk metallic glass (Zr-BMG) were investigated at room temperature using nanoindentation technology under different loading rates and peak loads (holding loads). The creep stress was calculated using the work-of-indentation, the creep stress-time curve was fitted and analyzed by combining the Kohlrausch-Williams-Watts (KWW) equation, the activation volume formula, and the generalized Maxwell model, revealing the dynamic evolution of microstructural heterogeneity, flow units, relaxation time spectra, and activation energy spectra. The results show that as the peak load and loading rate increase, the stress drop magnitude increases, exhibiting a typical stress relaxation phenomenon. The activation energy is closely related to the internal microstructural heterogeneity, the more significant the microstructural heterogeneity, the lower the required activation energy, making flow units more easily activated. This study provides important experimental evidence and theoretical support for a deeper understanding of the creep behavior and micro-mechanical mechanisms of metallic glass.</div></div>","PeriodicalId":16461,"journal":{"name":"Journal of Non-crystalline Solids","volume":"652 ","pages":"Article 123407"},"PeriodicalIF":3.2,"publicationDate":"2025-01-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143130849","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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 : 2025-01-22DOI: 10.1016/j.jnoncrysol.2025.123403
Kevin Przepiora , Edgar Dutra Zanotto , Stéphane Godet
This is a response to comments made by M. Shepilov towards our recent publication [K. Przepiora et al., J. Non-Cryst. Solids 639 (2024) 123109]. The commentator provides thorough analysis, critique and valuable suggestions regarding our work. We believe this response and clarification strengthens our original findings while acknowledging the thoughtful feedback provided by the commentator.
{"title":"Response to comment on “Nanostructural ordering in phase-separated soda-lime-silica glass”","authors":"Kevin Przepiora , Edgar Dutra Zanotto , Stéphane Godet","doi":"10.1016/j.jnoncrysol.2025.123403","DOIUrl":"10.1016/j.jnoncrysol.2025.123403","url":null,"abstract":"<div><div>This is a response to comments made by M. Shepilov towards our recent publication [K. Przepiora et al., J. Non-Cryst. Solids 639 (2024) 123109]. The commentator provides thorough analysis, critique and valuable suggestions regarding our work. We believe this response and clarification strengthens our original findings while acknowledging the thoughtful feedback provided by the commentator.</div></div>","PeriodicalId":16461,"journal":{"name":"Journal of Non-crystalline Solids","volume":"652 ","pages":"Article 123403"},"PeriodicalIF":3.2,"publicationDate":"2025-01-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143130851","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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 : 2025-01-21DOI: 10.1016/j.jnoncrysol.2025.123406
Huohong Tang , Nifei Li , Xuebin Li , Junsheng Zhang , Shunhua Chen
The plastic deformation of bulk metallic glasses (BMGs) is characterized by serrated plastic flows, leading to catastrophic failures, while the prediction of such catastrophic failures is still challenging. In this work, three basic deep learning neural network models, including the Long Short-Term Memory (LSTM), Transformer and Gate Recurrent Unit (GRU), as well as two improved models, the LSTM+Transformer (LSTM+T) and GRU+Convolutional Neural Networks (CNN), were used to predict the plastic flow information of BMGs with different sample aspect ratios and compression rates. The Pearson correlation coefficients among nine parameters, showing the correlations between the load drop and elastic energy accumulation rate, were calculated by heatmap. This also aids in the selection of features and prediction targets in subsequent model training, helping to reduce overfitting. Considering factors such as training set size, model applicability, and prediction accuracy, the failure of BMGs was monitored and predicted in real time from two perspectives: multiple and single data sets. The predictability of load drop and the strain of load drop initiation were observed from the results of multiple sets of data, and the LSTM model can predict their development effectively. Subsequently, the LSTM model was trained specifically using a single set of data, where the improvement on the predictions for peak stress, and the strain of the load drops initiation was achieved. This work provides a new method that predicts the catastrophic failure of BMGs and the damage characteristics for similar solids.
{"title":"Predicting the catastrophic failure of bulk metallic glasses based on time-series prediction models","authors":"Huohong Tang , Nifei Li , Xuebin Li , Junsheng Zhang , Shunhua Chen","doi":"10.1016/j.jnoncrysol.2025.123406","DOIUrl":"10.1016/j.jnoncrysol.2025.123406","url":null,"abstract":"<div><div>The plastic deformation of bulk metallic glasses (BMGs) is characterized by serrated plastic flows, leading to catastrophic failures, while the prediction of such catastrophic failures is still challenging. In this work, three basic deep learning neural network models, including the Long Short-Term Memory (LSTM), Transformer and Gate Recurrent Unit (GRU), as well as two improved models, the LSTM+Transformer (LSTM+<em>T</em>) and GRU+Convolutional Neural Networks (CNN), were used to predict the plastic flow information of BMGs with different sample aspect ratios and compression rates. The Pearson correlation coefficients among nine parameters, showing the correlations between the load drop and elastic energy accumulation rate, were calculated by heatmap. This also aids in the selection of features and prediction targets in subsequent model training, helping to reduce overfitting. Considering factors such as training set size, model applicability, and prediction accuracy, the failure of BMGs was monitored and predicted in real time from two perspectives: multiple and single data sets. The predictability of load drop and the strain of load drop initiation were observed from the results of multiple sets of data, and the LSTM model can predict their development effectively. Subsequently, the LSTM model was trained specifically using a single set of data, where the improvement on the predictions for peak stress, and the strain of the load drops initiation was achieved. This work provides a new method that predicts the catastrophic failure of BMGs and the damage characteristics for similar solids.</div></div>","PeriodicalId":16461,"journal":{"name":"Journal of Non-crystalline Solids","volume":"652 ","pages":"Article 123406"},"PeriodicalIF":3.2,"publicationDate":"2025-01-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143130852","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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 : 2025-01-21DOI: 10.1016/j.jnoncrysol.2025.123404
Boyouliang Wang , Jianping Lai , Chi Wang , Zhenghao Jiang , Abdullah Noor , Zhengbing Xiao , Hongtu He , Jiaxin Yu
The molecular dynamics (MD) simulation methods were employed to investigate the compositional dependence in the type, size, and number of polyhedra with the aim to elucidate the evolution of differences of short-range units within the systems and extract the relevant structure-property relationships based on the variations in glass-forming ability (GFA). It was found that the changes in GFA exhibited a strong correlation with the variations in the number of polyhedral type. This suggests that the number of polyhedral type is the decisive factor influencing the strong compositional dependence of GFA. Conversely, a weak dependence of the GFA on size and number of polyhedra was found. We propose that the existence of multiple polyhedra of dissimilar structures leads to apparent global disordering, thus facilitating the ease of glass formation.
{"title":"Revealing the relationship between short-range units and glass-forming ability in CuZr-based alloys by molecular dynamics simulations","authors":"Boyouliang Wang , Jianping Lai , Chi Wang , Zhenghao Jiang , Abdullah Noor , Zhengbing Xiao , Hongtu He , Jiaxin Yu","doi":"10.1016/j.jnoncrysol.2025.123404","DOIUrl":"10.1016/j.jnoncrysol.2025.123404","url":null,"abstract":"<div><div>The molecular dynamics (MD) simulation methods were employed to investigate the compositional dependence in the type, size, and number of polyhedra with the aim to elucidate the evolution of differences of short-range units within the systems and extract the relevant structure-property relationships based on the variations in glass-forming ability (GFA). It was found that the changes in GFA exhibited a strong correlation with the variations in the number of polyhedral type. This suggests that the number of polyhedral type is the decisive factor influencing the strong compositional dependence of GFA. Conversely, a weak dependence of the GFA on size and number of polyhedra was found. We propose that the existence of multiple polyhedra of dissimilar structures leads to apparent global disordering, thus facilitating the ease of glass formation.</div></div>","PeriodicalId":16461,"journal":{"name":"Journal of Non-crystalline Solids","volume":"652 ","pages":"Article 123404"},"PeriodicalIF":3.2,"publicationDate":"2025-01-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143130850","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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 : 2025-01-20DOI: 10.1016/j.jnoncrysol.2025.123402
M. Shepilov
The authors of a recent paper [K. Przepiora et al., J. Non-Cryst. Solids 639 (2024) 123109] claim that they revealed nanostructural ordering of particles in phase-separated soda-lime-silica glass. From my point of view, this claim is unfounded. In what follows I substantiate my opinion.
{"title":"Comment on “Nanostructural ordering in phase-separated soda-lime-silica glass”","authors":"M. Shepilov","doi":"10.1016/j.jnoncrysol.2025.123402","DOIUrl":"10.1016/j.jnoncrysol.2025.123402","url":null,"abstract":"<div><div>The authors of a recent paper [K. Przepiora et al., J. Non-Cryst. Solids 639 (2024) 123109] claim that they revealed nanostructural ordering of particles in phase-separated soda-lime-silica glass. From my point of view, this claim is unfounded. In what follows I substantiate my opinion.</div></div>","PeriodicalId":16461,"journal":{"name":"Journal of Non-crystalline Solids","volume":"652 ","pages":"Article 123402"},"PeriodicalIF":3.2,"publicationDate":"2025-01-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143130740","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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 : 2025-01-16DOI: 10.1016/j.jnoncrysol.2025.123398
Sana Riaz , Muhammad Ali Khan , Taghrid S. Alomar , Aimon Furrakh , Naeem Akhtar , Nimra Saher Zain , Syed Waqas Bukhari , Nosherwan Adil , Najla AlMasoud
The development of innovative materials that possess remineralization and antibacterial efficacy to reduce white spot lesions (WSLs) are becoming growing clinical demands. To overcome these WSLs, bioactive glass (BG) is widely acknowledged due to its bioactivity. To introduce subsidiary biological functions, BG was doped with therapeutic ions i.e., Ag and Cu, that significantly improve antibacterial properties. In this study, Ag/Cu was co-doped into BG (A/C@BG) by sol-gel method. Ion release studies done by ICP-OES verified sustained release of Ag/Cu, placed in SBF while in-vitro bioactivity supported formation of hydroxyapatite layer. Antibacterial studies of A/C@BG demonstrated significant increase in inhibition zones, measuring 14 and 10 mm against S. mutans and P. gingivalis. Moreover, mechanical studies demonstrate SBS of adhesive loaded with A/C@BG compared with control, does not decrease significantly. The results suggested A/C@BG possesses improved efficacy as bioactive filler that may facilitate antibacterial characteristics to prevent WSLs while maintaining optimal SBS.
{"title":"Synthesis and characterization of bioactive glass co-doped with silver and copper for prevention of white spot lesions","authors":"Sana Riaz , Muhammad Ali Khan , Taghrid S. Alomar , Aimon Furrakh , Naeem Akhtar , Nimra Saher Zain , Syed Waqas Bukhari , Nosherwan Adil , Najla AlMasoud","doi":"10.1016/j.jnoncrysol.2025.123398","DOIUrl":"10.1016/j.jnoncrysol.2025.123398","url":null,"abstract":"<div><div>The development of innovative materials that possess remineralization and antibacterial efficacy to reduce white spot lesions (WSLs) are becoming growing clinical demands. To overcome these WSLs, bioactive glass (BG) is widely acknowledged due to its bioactivity. To introduce subsidiary biological functions, BG was doped with therapeutic ions i.e., Ag and Cu, that significantly improve antibacterial properties. In this study, Ag/Cu was co-doped into BG (A/C@BG) by sol-gel method. Ion release studies done by ICP-OES verified sustained release of Ag/Cu, placed in SBF while <em>in-vitro</em> bioactivity supported formation of hydroxyapatite layer. Antibacterial studies of A/C@BG demonstrated significant increase in inhibition zones, measuring 14 and 10 mm against <em>S. mutans</em> and <em>P. gingivalis</em>. Moreover, mechanical studies demonstrate SBS of adhesive loaded with A/C@BG compared with control, does not decrease significantly. The results suggested A/C@BG possesses improved efficacy as bioactive filler that may facilitate antibacterial characteristics to prevent WSLs while maintaining optimal SBS.</div></div>","PeriodicalId":16461,"journal":{"name":"Journal of Non-crystalline Solids","volume":"652 ","pages":"Article 123398"},"PeriodicalIF":3.2,"publicationDate":"2025-01-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143130853","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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 : 2025-01-16DOI: 10.1016/j.jnoncrysol.2025.123401
Jana Holubová, Zdeněk Černošek
The glasses of the NiO-ZnO-P2O5 system were prepared in two compositional series formally expressed in oxides: metaphosphate series (A), i.e. without changing the anion, xNiO-(50-x)ZnO-50P2O5 and the metaphosphate to pyrophosphate series (B), i.e. with changing the anion, xNiO-(50–0.75x)ZnO-(50–0.25x)P2O5. Using magnetic susceptibility, Raman spectroscopy and electron absorption spectroscopy it was determined that all glasses containing nickel were paramagnetic with Ni2+ tetrahedral coordination. The Ni-O(P) bond was found to have a higher ionicity compare to Zn-O(P) bond. If metaphosphate is changed to pyrophosphate, series (B), glasses can only be prepared up to 20 mol% of NiO and at higher concentration crystalline nickel pyrophosphate appears. It follows that Ni2+ ions do not connect pyrophosphate structural units and are therefore unable to form a cationically linked glass network. The glass transition temperature and the coefficient of thermal expansion are related to the concentration of metaphosphates and, in principle, increase with rising nickel content.
{"title":"The influence of nickel on the chemistry of nickel-zinc phosphate glasses","authors":"Jana Holubová, Zdeněk Černošek","doi":"10.1016/j.jnoncrysol.2025.123401","DOIUrl":"10.1016/j.jnoncrysol.2025.123401","url":null,"abstract":"<div><div>The glasses of the NiO-ZnO-P<sub>2</sub>O<sub>5</sub> system were prepared in two compositional series formally expressed in oxides: metaphosphate series (A), i.e. without changing the anion, xNiO-(50-x)ZnO-50P<sub>2</sub>O<sub>5</sub> and the metaphosphate to pyrophosphate series (B), i.e. with changing the anion, xNiO-(50–0.75x)ZnO-(50–0.25x)P<sub>2</sub>O<sub>5</sub>. Using magnetic susceptibility, Raman spectroscopy and electron absorption spectroscopy it was determined that all glasses containing nickel were paramagnetic with Ni<sup>2+</sup> tetrahedral coordination. The Ni-O(P) bond was found to have a higher ionicity compare to Zn-O(P) bond. If metaphosphate is changed to pyrophosphate, series (B), glasses can only be prepared up to 20 mol% of NiO and at higher concentration crystalline nickel pyrophosphate appears. It follows that Ni<sup>2+</sup> ions do not connect pyrophosphate structural units and are therefore unable to form a cationically linked glass network. The glass transition temperature and the coefficient of thermal expansion are related to the concentration of metaphosphates and, in principle, increase with rising nickel content.</div></div>","PeriodicalId":16461,"journal":{"name":"Journal of Non-crystalline Solids","volume":"652 ","pages":"Article 123401"},"PeriodicalIF":3.2,"publicationDate":"2025-01-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143130848","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
This work demonstrates that the Zr-doped Mg-Zn-Ca bulk metallic glasses (BMGs) with no toxic or allergenic substances exhibit good corrosion resistance, high compressive fracture strength together with distinct plasticity. The Mg-based BMGs containing Zr element up to 1.5 at.% show slightly higher thermal stability. The addition of Zr effectively slows down the degradation rate of the alloy from a rather fast level of the Mg-Zn-Ca base alloys. When Mg-based BMGs are treated with Zr element, their corrosion resistance in simulated body fluids (SBF) is enhanced by promoting the generation of a Zn2+-enriched protective coating on the alloy surfaces. The 1.5 at.% Zr glassy alloy displays significantly improved compressive fracture strength of 810 MPa. More importantly, the distinct plastic deformation region is observed in the compressive curves for the Zr-doped BMGs. Moreover, the formation of plenty of shear bands on the outer surface for the 1.5 at.% Zr alloy indicates that minor alloying Zr improves the plasticity of the Mg-based BMGs. The success in synthesizing toxic elements-free Mg-based BMGs with excellent combination of high fracture strength, distinct plasticity, desirable resistance to corrosion is encouraging for the exploitation of new plastic Mg-based biomaterials for high performance biodegradable implants.
{"title":"The Zr-doped Mg-Zn-Ca bulk metallic glasses with high compressive strength, distinct plasticity and good corrosion resistance","authors":"C.Y. Wang , J.F. Hou , Z.C. Dong , Z.Q. Zhang , C.L. Qin","doi":"10.1016/j.jnoncrysol.2025.123397","DOIUrl":"10.1016/j.jnoncrysol.2025.123397","url":null,"abstract":"<div><div>This work demonstrates that the Zr-doped Mg-Zn-Ca bulk metallic glasses (BMGs) with no toxic or allergenic substances exhibit good corrosion resistance, high compressive fracture strength together with distinct plasticity. The Mg-based BMGs containing Zr element up to 1.5 at.% show slightly higher thermal stability. The addition of Zr effectively slows down the degradation rate of the alloy from a rather fast level of the Mg-Zn-Ca base alloys. When Mg-based BMGs are treated with Zr element, their corrosion resistance in simulated body fluids (SBF) is enhanced by promoting the generation of a Zn<sup>2+</sup>-enriched protective coating on the alloy surfaces. The 1.5 at.% Zr glassy alloy displays significantly improved compressive fracture strength of 810 MPa. More importantly, the distinct plastic deformation region is observed in the compressive curves for the Zr-doped BMGs. Moreover, the formation of plenty of shear bands on the outer surface for the 1.5 at.% Zr alloy indicates that minor alloying Zr improves the plasticity of the Mg-based BMGs. The success in synthesizing toxic elements-free Mg-based BMGs with excellent combination of high fracture strength, distinct plasticity, desirable resistance to corrosion is encouraging for the exploitation of new plastic Mg-based biomaterials for high performance biodegradable implants.</div></div>","PeriodicalId":16461,"journal":{"name":"Journal of Non-crystalline Solids","volume":"652 ","pages":"Article 123397"},"PeriodicalIF":3.2,"publicationDate":"2025-01-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143130779","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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 : 2025-01-16DOI: 10.1016/j.jnoncrysol.2025.123400
Ruslan A. Sergiienko , Adit Sharma , Oleksandr A. Shcheretskyi , Vladislav Yu Zadorozhnyy , Volodymyr O. Shcheretskyi , Oleksandr M. Myslyvchenko , Anatolii M. Verkhovliuk , Andrey A. Stepashkin , J.C. Qiao
This study investigates the thermophysical properties of Zr65Cu17.5Ni10Al7.5 bulk metallic glass during its amorphous-to-crystalline transformation. Differential scanning calorimetry was used to examine the glass transition and crystallization temperatures, enthalpy of crystallization and activation energy. Dynamic mechanical analysis and laser flash analysis were used to determine the storage and loss moduli, thermal diffusivity and thermal conductivity, respectively. Heating-cooling cycles induced structural relaxation and irreversible changes in the amorphous material. Structural relaxation at increasing aging temperatures below glass transition temperature resulted in the increase in the storage modulus and higher loss factor in comparison with the as-cast state. Crystallization led to the formation of intermetallic phases and improved thermal conductivity. Overall, the fully crystalline material exhibited the highest thermal conductivity and diffusivity. Heat treatment at 390 °C for 20 min and at 400 °C for 5 min enhanced plasticity, attributed to shear bands, crystalline phases, and structural relaxation.
{"title":"Thermophysical properties of Zr65Cu17.5Ni10Al7.5 bulk metallic glass","authors":"Ruslan A. Sergiienko , Adit Sharma , Oleksandr A. Shcheretskyi , Vladislav Yu Zadorozhnyy , Volodymyr O. Shcheretskyi , Oleksandr M. Myslyvchenko , Anatolii M. Verkhovliuk , Andrey A. Stepashkin , J.C. Qiao","doi":"10.1016/j.jnoncrysol.2025.123400","DOIUrl":"10.1016/j.jnoncrysol.2025.123400","url":null,"abstract":"<div><div>This study investigates the thermophysical properties of Zr<sub>65</sub>Cu<sub>17.5</sub>Ni<sub>10</sub>Al<sub>7.5</sub> bulk metallic glass during its amorphous-to-crystalline transformation. Differential scanning calorimetry was used to examine the glass transition and crystallization temperatures, enthalpy of crystallization and activation energy. Dynamic mechanical analysis and laser flash analysis were used to determine the storage and loss moduli, thermal diffusivity and thermal conductivity, respectively. Heating-cooling cycles induced structural relaxation and irreversible changes in the amorphous material. Structural relaxation at increasing aging temperatures below glass transition temperature resulted in the increase in the storage modulus and higher loss factor in comparison with the as-cast state. Crystallization led to the formation of intermetallic phases and improved thermal conductivity. Overall, the fully crystalline material exhibited the highest thermal conductivity and diffusivity. Heat treatment at 390 °C for 20 min and at 400 °C for 5 min enhanced plasticity, attributed to shear bands, crystalline phases, and structural relaxation.</div></div>","PeriodicalId":16461,"journal":{"name":"Journal of Non-crystalline Solids","volume":"652 ","pages":"Article 123400"},"PeriodicalIF":3.2,"publicationDate":"2025-01-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143130847","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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 : 2025-01-14DOI: 10.1016/j.jnoncrysol.2025.123396
Kalis-Rubedo Thoriq , Tan-Tai Do , Te-Hua Fang
Molecular dynamics simulations were utilized to explore nanoimprinting techniques and assess the elastic recovery and mechanical properties of Cu80Ta20/Cu20Ta80. The impact of velocity, depth, and different layers of Amorphous/Amorphous Nanolaminates (AANLs) was thoroughly investigated. Altering the simulation conditions significantly influenced important mechanical aspects, such as shear strain, imprint forces, displacement vector, and elastic recovery ratio, which were extensively studied. The results indicated that as the number of layers in the substrate increases from 2 to 8, the imprinting force also rises. This indicates that a greater number of layers leads to a stronger resistance to deformation during the nanoimprinting process. The atomic distribution within the layers also plays a critical role, influencing the material's plastic deformation behavior and imprinting characteristics. Besides, the substrate with the smallest layer thickness (18.7 Å or 8 layers) demonstrated the highest elastic recovery ratio. Furthermore, the imprinting force exhibits an increase with rising loading velocity, with higher velocities resulting in greater forces compared to lower velocities. Faster velocities reduce elastic recovery and increase resistance to flow, while slower velocities allow for more plastic deformation and better imprinting fidelity. These insights will facilitate the development of amorphous materials that demonstrate both high strength and exceptional ductility.
{"title":"Properties of the interfacial transition and their impact on Cu80Ta20/Cu20Ta80 nano-multilayers by nanoimprinting","authors":"Kalis-Rubedo Thoriq , Tan-Tai Do , Te-Hua Fang","doi":"10.1016/j.jnoncrysol.2025.123396","DOIUrl":"10.1016/j.jnoncrysol.2025.123396","url":null,"abstract":"<div><div>Molecular dynamics simulations were utilized to explore nanoimprinting techniques and assess the elastic recovery and mechanical properties of Cu<sub>80</sub>Ta<sub>20</sub>/Cu<sub>20</sub>Ta<sub>80</sub>. The impact of velocity, depth, and different layers of Amorphous/Amorphous Nanolaminates (AANLs) was thoroughly investigated. Altering the simulation conditions significantly influenced important mechanical aspects, such as shear strain, imprint forces, displacement vector, and elastic recovery ratio, which were extensively studied. The results indicated that as the number of layers in the substrate increases from 2 to 8, the imprinting force also rises. This indicates that a greater number of layers leads to a stronger resistance to deformation during the nanoimprinting process. The atomic distribution within the layers also plays a critical role, influencing the material's plastic deformation behavior and imprinting characteristics. Besides, the substrate with the smallest layer thickness (18.7 Å or 8 layers) demonstrated the highest elastic recovery ratio. Furthermore, the imprinting force exhibits an increase with rising loading velocity, with higher velocities resulting in greater forces compared to lower velocities. Faster velocities reduce elastic recovery and increase resistance to flow, while slower velocities allow for more plastic deformation and better imprinting fidelity. These insights will facilitate the development of amorphous materials that demonstrate both high strength and exceptional ductility.</div></div>","PeriodicalId":16461,"journal":{"name":"Journal of Non-crystalline Solids","volume":"651 ","pages":"Article 123396"},"PeriodicalIF":3.2,"publicationDate":"2025-01-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143139386","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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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