Widyastuti Widyastuti, R. Wahyuono, R. Fajarin, S. Sulistijono, Arif Nur Hakim, Lilis Mariani, Herry Purnomo, Ibrahim Fatahillah Hizbul Islam
The nosecone tip during the launch process becomes the first part that experiences friction against the atmosphere so that heat is generated, which continues to increase over time. Therefore, the nosecone tip material must have high-temperature resistance, and the materials used must not interfere with the avionics and telemetry systems of the rocket. When the sounding rocket orbits at an altitude of 200-300 Km, the atmospheric environmental conditions also fluctuate, so the nose cone tip must also be able to adapt to this condition. The end of the nose cone must be protected with a high heat-resistant Thermal Barrier Coating (TBC) coating using Yttria Stabilized Zirconia (YSZ). YSZ modified with Al2O3 has impressive performance against high thermal by increasing the temperature resistance of the substrate to about 1200°C. In this paper, the experiment done for the first time using Hastelloy C276 coated with YSZ with thermal spray method has shown good performance. The pull of test results shows the highest bond tensile strength after heat exposure value at 23,04 MPa. And the thermal torch testing resulted in mass decreasing by 0.493 grams at 1200°C. The vector analyser also offers good performance reflection loss, valued at -0.324 dB at 10 GHz, and the thermal gravimetry of the material tip nose is 93,2% at 1200°C.
{"title":"Low Reflection-Loss Thermal Barrier Coating on Hastelloy C276 for Radio Control Rocket Tip Nosecone Using Yttria-Stabilized Zirconia (YSZ) at Extreme Temperature","authors":"Widyastuti Widyastuti, R. Wahyuono, R. Fajarin, S. Sulistijono, Arif Nur Hakim, Lilis Mariani, Herry Purnomo, Ibrahim Fatahillah Hizbul Islam","doi":"10.4028/p-fNGYk1","DOIUrl":"https://doi.org/10.4028/p-fNGYk1","url":null,"abstract":"The nosecone tip during the launch process becomes the first part that experiences friction against the atmosphere so that heat is generated, which continues to increase over time. Therefore, the nosecone tip material must have high-temperature resistance, and the materials used must not interfere with the avionics and telemetry systems of the rocket. When the sounding rocket orbits at an altitude of 200-300 Km, the atmospheric environmental conditions also fluctuate, so the nose cone tip must also be able to adapt to this condition. The end of the nose cone must be protected with a high heat-resistant Thermal Barrier Coating (TBC) coating using Yttria Stabilized Zirconia (YSZ). YSZ modified with Al2O3 has impressive performance against high thermal by increasing the temperature resistance of the substrate to about 1200°C. In this paper, the experiment done for the first time using Hastelloy C276 coated with YSZ with thermal spray method has shown good performance. The pull of test results shows the highest bond tensile strength after heat exposure value at 23,04 MPa. And the thermal torch testing resulted in mass decreasing by 0.493 grams at 1200°C. The vector analyser also offers good performance reflection loss, valued at -0.324 dB at 10 GHz, and the thermal gravimetry of the material tip nose is 93,2% at 1200°C.","PeriodicalId":21754,"journal":{"name":"Solid State Phenomena","volume":"18 11","pages":"49 - 60"},"PeriodicalIF":0.0,"publicationDate":"2023-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138954988","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}
W. Agudelo, Y. Montoya, Alejandra Garcia-Garcia, John Bustamante
Tissue engineering has focused on the development of biomaterials, modulating the morphological and electrochemical characteristics based on their final application. In this setting, the purpose of the present study was to determine the physicochemical response of electrospun membranes of silk fibroin extracted from sericulture wastes and their functionalization with choline based bio-ionic liquids. A comparative study of their response was carried out with membranes obtained from the same protein but functionalized with gold nanoparticles. The biomaterials developed were characterized by UV-Visible spectrophotometry, FTIR spectroscopy, electron microscopy (SEM and FESEM), dynamic light scattering (DLS), and Linear sweep voltammetry. The results obtained showed a fibrillar morphology and the conduction of electrical stimuli by the membranes functionalized with the gold nanoparticles or the bio-ionic liquids, where for the latter the response is modulated by the concentration used in the development of the biocomposite.
{"title":"Physicochemical Properties of Silk Fibroin Electrospun Membranes Functionalized with Gold Nanoparticles and Choline Based Bio-Ionic Liquids","authors":"W. Agudelo, Y. Montoya, Alejandra Garcia-Garcia, John Bustamante","doi":"10.4028/p-HI0kyb","DOIUrl":"https://doi.org/10.4028/p-HI0kyb","url":null,"abstract":"Tissue engineering has focused on the development of biomaterials, modulating the morphological and electrochemical characteristics based on their final application. In this setting, the purpose of the present study was to determine the physicochemical response of electrospun membranes of silk fibroin extracted from sericulture wastes and their functionalization with choline based bio-ionic liquids. A comparative study of their response was carried out with membranes obtained from the same protein but functionalized with gold nanoparticles. The biomaterials developed were characterized by UV-Visible spectrophotometry, FTIR spectroscopy, electron microscopy (SEM and FESEM), dynamic light scattering (DLS), and Linear sweep voltammetry. The results obtained showed a fibrillar morphology and the conduction of electrical stimuli by the membranes functionalized with the gold nanoparticles or the bio-ionic liquids, where for the latter the response is modulated by the concentration used in the development of the biocomposite.","PeriodicalId":21754,"journal":{"name":"Solid State Phenomena","volume":"16 22","pages":"137 - 142"},"PeriodicalIF":0.0,"publicationDate":"2023-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139168893","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}
M. Weiner, T. Zienert, M. Schmidtchen, J. Hubálková, C. G. Aneziris, Ulrich Prahl
In sintering simulation, there are basically two approaches: microscale simulation, in which distinct particles or pores are regarded, and macroscale, where the porous body is regarded as continuum with variable density.Material parameters of the latter can be determined by experiment or by microscale models.Current microscale sintering models mainly use circular resp.~spherical particle geometries to represent the actual shape of real particles.However, sintering behavior is heavily dependent on the morphology of the powder particles, since sintering progress is driven by reduction of the bound surface energy.So current models neglect the influence of local contact morphology.Here, a finite differences based microscopic sintering model is presented, which is capable to work with irregular particle geometries.Asymmetric particle contacts in shape and substance are possible within.The differences between circular particle contacts and asymmetric ones are investigated.Furthermore, a statistical way of describing the morphology of powder particles and its inclusion into sintering simulation using Monte Carlo techniques are shown.Morphology data are obtained from microscopic imaging by extracting the 2D contours.The particles' contour lines are fitted to a parameterized shape function including ovality and first order waves to obtain a description of the particles' fine shapes.From the statistical distribution of the shape parameters, randomized particle groupings are sampled as input for microscopic sintering simulation.Statistical analysis of the samples' sintering behaviors leads to statements about the powder's.Comparisons to classical spherical modelling are given.
{"title":"A New Approach for Sintering Simulation of Irregularly Shaped Powder Particles","authors":"M. Weiner, T. Zienert, M. Schmidtchen, J. Hubálková, C. G. Aneziris, Ulrich Prahl","doi":"10.4028/p-6qp7lz","DOIUrl":"https://doi.org/10.4028/p-6qp7lz","url":null,"abstract":"In sintering simulation, there are basically two approaches: microscale simulation, in which distinct particles or pores are regarded, and macroscale, where the porous body is regarded as continuum with variable density.Material parameters of the latter can be determined by experiment or by microscale models.Current microscale sintering models mainly use circular resp.~spherical particle geometries to represent the actual shape of real particles.However, sintering behavior is heavily dependent on the morphology of the powder particles, since sintering progress is driven by reduction of the bound surface energy.So current models neglect the influence of local contact morphology.Here, a finite differences based microscopic sintering model is presented, which is capable to work with irregular particle geometries.Asymmetric particle contacts in shape and substance are possible within.The differences between circular particle contacts and asymmetric ones are investigated.Furthermore, a statistical way of describing the morphology of powder particles and its inclusion into sintering simulation using Monte Carlo techniques are shown.Morphology data are obtained from microscopic imaging by extracting the 2D contours.The particles' contour lines are fitted to a parameterized shape function including ovality and first order waves to obtain a description of the particles' fine shapes.From the statistical distribution of the shape parameters, randomized particle groupings are sampled as input for microscopic sintering simulation.Statistical analysis of the samples' sintering behaviors leads to statements about the powder's.Comparisons to classical spherical modelling are given.","PeriodicalId":21754,"journal":{"name":"Solid State Phenomena","volume":"83 8","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138597891","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}
Yi Zhe Yang, Chuan Ting Wang, Yan Song Yang, Yuan He, Lei Guo, Yong He
In this paper, two types of W-Zr alloy with different proportions were prepared. The dynamic and quasi-static compression mechanical properties of Zr-25%W alloy and Zr-50%W alloy at various strain rates were obtained. The results showed that the tungsten component could improve the mechanical strength of the alloy, while the zirconium component could significantly improve the plasticity of the alloy. The JC constitutive models of two types of W-Zr alloys and the KHL constitutive model of Zr-25%W alloy were proposed. The fitting parameters of JC model and KHL model were determined by the dynamic and quad-static compression tests. Dynamic impact tests of two types of W-Zr alloys were carried out in argon atmosphere at various velocities. The power law distribution theory for brittle materials could also describe the high-speed impact of W-Zr alloy.
{"title":"Constitutive Model and Impact Induced Fragmentation of W-Zr Alloy","authors":"Yi Zhe Yang, Chuan Ting Wang, Yan Song Yang, Yuan He, Lei Guo, Yong He","doi":"10.4028/p-08fcjt","DOIUrl":"https://doi.org/10.4028/p-08fcjt","url":null,"abstract":"In this paper, two types of W-Zr alloy with different proportions were prepared. The dynamic and quasi-static compression mechanical properties of Zr-25%W alloy and Zr-50%W alloy at various strain rates were obtained. The results showed that the tungsten component could improve the mechanical strength of the alloy, while the zirconium component could significantly improve the plasticity of the alloy. The JC constitutive models of two types of W-Zr alloys and the KHL constitutive model of Zr-25%W alloy were proposed. The fitting parameters of JC model and KHL model were determined by the dynamic and quad-static compression tests. Dynamic impact tests of two types of W-Zr alloys were carried out in argon atmosphere at various velocities. The power law distribution theory for brittle materials could also describe the high-speed impact of W-Zr alloy.","PeriodicalId":21754,"journal":{"name":"Solid State Phenomena","volume":"115 19","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138599542","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}
Ahmed W. Abdelghany, M. Jaskari, A. Hamada, M. Gepreel, A. Järvenpää
High-entropy alloys (HEAs) have led to breakthroughs in materials science due to their superior properties and the challenge of achieving the high strength and high ductility trade-off. Microstructural evolution during cold and warm compression tests of the single-phase Al8Cr12Mn25Fe35Ni20 high entropy alloy (Fe-HEA) is investigated in the present work. The current study assesses the effect of temperature on the mechanical properties and deformation mechanism of the face-centered cubic structure Fe-HEA. The arc-melted ingot is homogenized at 1473 K and then directly hot-rolled to break the cast structure of the alloy prior to testing procedures. Fe-HEA is tested through uniaxial compressive testing at three different selected temperatures: 293, 473, and 673 K utilizing a Gleeble thermo-mechanical simulator at a strain rate of 0.001 s-1. The compressive behavior at 673 K showed a higher strain hardening exponent when compared to 293 and 473 K. The deformed microstructural features of the compressed and quenched specimens, deformation mechanism, and phase revolution are investigated with X-ray diffraction (XRD) and electron backscattered diffraction (EBSD). Dislocation densities for the deformed conditions were estimated to be 4.11 × 1014 and 5.39 × 1014 m-2 for the 473 and 673 K deformed conditions, respectively. At a deformation temperature of 673 K, B2 precipitation is observed at the high-angle grain boundaries.
{"title":"Study on the Deformation Mechanism of a Nonequiatomic AlCrMnFeNi High-Entropy Alloy at Cold and Warm Temperatures","authors":"Ahmed W. Abdelghany, M. Jaskari, A. Hamada, M. Gepreel, A. Järvenpää","doi":"10.4028/p-qwtrs0","DOIUrl":"https://doi.org/10.4028/p-qwtrs0","url":null,"abstract":"High-entropy alloys (HEAs) have led to breakthroughs in materials science due to their superior properties and the challenge of achieving the high strength and high ductility trade-off. Microstructural evolution during cold and warm compression tests of the single-phase Al8Cr12Mn25Fe35Ni20 high entropy alloy (Fe-HEA) is investigated in the present work. The current study assesses the effect of temperature on the mechanical properties and deformation mechanism of the face-centered cubic structure Fe-HEA. The arc-melted ingot is homogenized at 1473 K and then directly hot-rolled to break the cast structure of the alloy prior to testing procedures. Fe-HEA is tested through uniaxial compressive testing at three different selected temperatures: 293, 473, and 673 K utilizing a Gleeble thermo-mechanical simulator at a strain rate of 0.001 s-1. The compressive behavior at 673 K showed a higher strain hardening exponent when compared to 293 and 473 K. The deformed microstructural features of the compressed and quenched specimens, deformation mechanism, and phase revolution are investigated with X-ray diffraction (XRD) and electron backscattered diffraction (EBSD). Dislocation densities for the deformed conditions were estimated to be 4.11 × 1014 and 5.39 × 1014 m-2 for the 473 and 673 K deformed conditions, respectively. At a deformation temperature of 673 K, B2 precipitation is observed at the high-angle grain boundaries.","PeriodicalId":21754,"journal":{"name":"Solid State Phenomena","volume":"77 7","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138600425","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}
Akihisa Inoue, Fan Li Kong, Xu Guang Zhu, Kuan Gao
Since the first synthesis of bulk metallic glasses (BMGs) by copper mold casting in 1990, much effort has been devoted to the searching of new BMG composition, the clarification of fundamental and engineering properties for BMGs and their industrialization. At present, BMGs have been formed in a large number of multicomponent alloy systems where the empirical three component rule is satisfied. Nowadays, commercialized BMGs are classified to Zr-based and Fe-based alloy groups. When we look at the industrialization of Zr-Al-Ni-Cu-based BMGs, the first commercialization was made for golf clubs in Japan in 1998, followed by watch parts etc. Since then, Zr-based BMGs have been used continuously up to 2013, though their application scale was in a limited state. Since 2014, the application scale was significantly extended in collaboration with the rapid developments of smartphones and electric vehicles. At present, the mass production facilities for Zr-based BMGs have been significantly developed and variety of BMG products have been produced. On the other hand, Fe-based soft magnetic BMGs were found in 1995. Their BMGs have also been used on a huge number of pieces in various kinds of electronic-magnetic instruments. These recent application states for Zr- and Fe-based BMGs are introduced together with new nanocrystalline Fe-based soft magnetic alloys developed through the derivation of alloy composition from Fe-based BMGs.
自1990年首次用铜模铸造方法合成大块金属玻璃以来，人们一直在努力寻找新的大块金属玻璃成分，澄清大块金属玻璃的基本性能和工程性能，并使其工业化。目前，在大量满足经验三分量规律的多组分合金体系中已经形成了bmg。目前商品化的bmg合金分为锆基合金和铁基合金两大类。当我们观察以zr - al - ni - cu为基础的bmg的产业化时，第一次商业化是1998年在日本为高尔夫俱乐部制造的，随后是手表零件等。此后，基于zr的bmg一直使用到2013年，但其应用规模处于有限状态。2014年以来，随着智能手机和电动汽车的快速发展，应用规模显著扩大。目前，基于zr的BMG的批量生产设施已经得到了显著的发展，各种BMG产品已经生产出来。另一方面，1995年发现了铁基软磁bmg。他们的bmg也被大量用于各种电子磁性仪器的部件上。介绍了Zr基和fe基bmg合金的最新应用状况，以及由fe基bmg合金衍生出的新型纳米晶fe基软磁合金。
{"title":"Mass Production and Vast Application States of Bulk Metallic Glasses","authors":"Akihisa Inoue, Fan Li Kong, Xu Guang Zhu, Kuan Gao","doi":"10.4028/p-dv5o9h","DOIUrl":"https://doi.org/10.4028/p-dv5o9h","url":null,"abstract":"Since the first synthesis of bulk metallic glasses (BMGs) by copper mold casting in 1990, much effort has been devoted to the searching of new BMG composition, the clarification of fundamental and engineering properties for BMGs and their industrialization. At present, BMGs have been formed in a large number of multicomponent alloy systems where the empirical three component rule is satisfied. Nowadays, commercialized BMGs are classified to Zr-based and Fe-based alloy groups. When we look at the industrialization of Zr-Al-Ni-Cu-based BMGs, the first commercialization was made for golf clubs in Japan in 1998, followed by watch parts etc. Since then, Zr-based BMGs have been used continuously up to 2013, though their application scale was in a limited state. Since 2014, the application scale was significantly extended in collaboration with the rapid developments of smartphones and electric vehicles. At present, the mass production facilities for Zr-based BMGs have been significantly developed and variety of BMG products have been produced. On the other hand, Fe-based soft magnetic BMGs were found in 1995. Their BMGs have also been used on a huge number of pieces in various kinds of electronic-magnetic instruments. These recent application states for Zr- and Fe-based BMGs are introduced together with new nanocrystalline Fe-based soft magnetic alloys developed through the derivation of alloy composition from Fe-based BMGs.","PeriodicalId":21754,"journal":{"name":"Solid State Phenomena","volume":"7 3","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138598011","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}
A. Di schino, Mirko Sgambetterra, R. Schmidt, G. Stornelli, Anastasiya Tselikova
The inter-critical heat affected zone (ICHAZ) appears to be one of the most brittle sections in the welding of high-strength micro-alloyed steels (HSLA). Following repeated heating cycles in in with temperature ranging Ac1 /Ac3, the ICHAZ will face with an evident toughness and fatigue behavior reduction especially due to martensite-austenite constituent (MA) formation. Microalloying in high strength steels causes the generation of some phases in the matrix able to increase the mechanical properties of the joint. In this paper we report an investigation related to 1000 ppm vanadium addition in the welded joint of a structural S355 steel. The inter-critical zone of ta double pass welded joint is here reproduced by dilatometer, with second peak temperature ranging 720°C-790°C. The residual austenite dependence on inter-critical temperature is analyzed and related to the hardness behavior.
{"title":"Micro-Alloying Effect on the Inter-Critical Grain Coarsened Heat Affected Zone of a S355 Steel Welded Joint","authors":"A. Di schino, Mirko Sgambetterra, R. Schmidt, G. Stornelli, Anastasiya Tselikova","doi":"10.4028/p-7vagjd","DOIUrl":"https://doi.org/10.4028/p-7vagjd","url":null,"abstract":"The inter-critical heat affected zone (ICHAZ) appears to be one of the most brittle sections in the welding of high-strength micro-alloyed steels (HSLA). Following repeated heating cycles in in with temperature ranging Ac1 /Ac3, the ICHAZ will face with an evident toughness and fatigue behavior reduction especially due to martensite-austenite constituent (MA) formation. Microalloying in high strength steels causes the generation of some phases in the matrix able to increase the mechanical properties of the joint. In this paper we report an investigation related to 1000 ppm vanadium addition in the welded joint of a structural S355 steel. The inter-critical zone of ta double pass welded joint is here reproduced by dilatometer, with second peak temperature ranging 720°C-790°C. The residual austenite dependence on inter-critical temperature is analyzed and related to the hardness behavior.","PeriodicalId":21754,"journal":{"name":"Solid State Phenomena","volume":"87 12","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138600181","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}
Nanoscale dispersoids will retard or inhibit recrystallization of aluminum alloys during thermomechanical processes. In the present study, the influence of an addition of 0.6 wt. % Cu on the precipitation behavior of dispersoids in an Al-Mg-Si-Mn-Cr alloy had been investigated. Large amounts of dispersoids with different shapes, e.g. cubic, rod-like and plate-like, were achieved in the experimental alloys after homogenization. Compared with the Cu-free alloy, Cu-added alloy exhibits a higher proportion of cubic shape dispersoid. HRTEM results indicated that the cubic shape dispersoid has an icosahedral quasicrystal structure, while the rod-like or plate-like shape dispersoids show a simple cubic crystal structure. Due to the presence of a high number density of quasicrystalline dispersoids, the Cu-added alloy exhibits a higher recrystallization resistance during hot compression. This study presents a new insight that besides the precipitation strengthening, the Cu alloying in an Al-Mg-Si-Mn-Cr alloy can also contributes to the precipitation of dispersoids.
{"title":"Effect of Cu on the Precipitation of α-Al(Mn,Cr)Si Dispersoids in an Al-Mg-Si-Mn-Cr Alloy","authors":"Fang Zhen Liu, Qi Peng Dong, Jian Qin, Zhen Li, Hiromi Nagaumi","doi":"10.4028/p-j6n8ji","DOIUrl":"https://doi.org/10.4028/p-j6n8ji","url":null,"abstract":"Nanoscale dispersoids will retard or inhibit recrystallization of aluminum alloys during thermomechanical processes. In the present study, the influence of an addition of 0.6 wt. % Cu on the precipitation behavior of dispersoids in an Al-Mg-Si-Mn-Cr alloy had been investigated. Large amounts of dispersoids with different shapes, e.g. cubic, rod-like and plate-like, were achieved in the experimental alloys after homogenization. Compared with the Cu-free alloy, Cu-added alloy exhibits a higher proportion of cubic shape dispersoid. HRTEM results indicated that the cubic shape dispersoid has an icosahedral quasicrystal structure, while the rod-like or plate-like shape dispersoids show a simple cubic crystal structure. Due to the presence of a high number density of quasicrystalline dispersoids, the Cu-added alloy exhibits a higher recrystallization resistance during hot compression. This study presents a new insight that besides the precipitation strengthening, the Cu alloying in an Al-Mg-Si-Mn-Cr alloy can also contributes to the precipitation of dispersoids.","PeriodicalId":21754,"journal":{"name":"Solid State Phenomena","volume":"15 12","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138601293","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}
Bilal Hassan, Yann Jansen, S. Nouveau, Jonathan Corney
As aerospace engines advance to obtain higher thermal efficiencies, it is imperative to develop high temperature materials. Inconel 718 is a nickel-based superalloy that has been used for decades in aero-engine parts as it allows for use in high temperature applications. ATI 718Plus is a newer nickel-based superalloy that has been developed with a 55°C higher temperature capability over Inconel 718. ATI 718Plus components are manufactured by forging a wrought billet in stages to obtain the desired geometry and microstructure. Parts are heat treated to optimised proportions of γ’ and η phases. η phase is an acicular phase that precipitates on the grain boundaries, whereas γ’ is the primary strengthening phase. η phase is an important phase to understand as it is utilised in controlling the grain size during hot working processes at temperatures below its solvus temperature. When η phase is fully solutioned, the grain size is free to increase and hence the material mechanical properties can become detrimental. The short-term precipitation kinetics of η phase in strain-free ATI 718Plus is still not completely understood. In this study, the aims and objectives were to study the η precipitation kinetics in strain-free material as well as studying η phase precipitation in equilibrium conditions. TTT diagrams were produced for the η phase in strain-free material and compared to the limited data available in the open literature. In addition, the equilibrium η phase content, aspect ratio, length and width were determined and compared to the very little data that is currently published.
{"title":"Eta Phase Precipitation at Equilibrium and in Strain Free ATI 718Plus","authors":"Bilal Hassan, Yann Jansen, S. Nouveau, Jonathan Corney","doi":"10.4028/p-f9hnso","DOIUrl":"https://doi.org/10.4028/p-f9hnso","url":null,"abstract":"As aerospace engines advance to obtain higher thermal efficiencies, it is imperative to develop high temperature materials. Inconel 718 is a nickel-based superalloy that has been used for decades in aero-engine parts as it allows for use in high temperature applications. ATI 718Plus is a newer nickel-based superalloy that has been developed with a 55°C higher temperature capability over Inconel 718. ATI 718Plus components are manufactured by forging a wrought billet in stages to obtain the desired geometry and microstructure. Parts are heat treated to optimised proportions of γ’ and η phases. η phase is an acicular phase that precipitates on the grain boundaries, whereas γ’ is the primary strengthening phase. η phase is an important phase to understand as it is utilised in controlling the grain size during hot working processes at temperatures below its solvus temperature. When η phase is fully solutioned, the grain size is free to increase and hence the material mechanical properties can become detrimental. The short-term precipitation kinetics of η phase in strain-free ATI 718Plus is still not completely understood. In this study, the aims and objectives were to study the η precipitation kinetics in strain-free material as well as studying η phase precipitation in equilibrium conditions. TTT diagrams were produced for the η phase in strain-free material and compared to the limited data available in the open literature. In addition, the equilibrium η phase content, aspect ratio, length and width were determined and compared to the very little data that is currently published.","PeriodicalId":21754,"journal":{"name":"Solid State Phenomena","volume":"118 15","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138599397","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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