MatSciRN: Other Mechanical Properties & Deformation of Materials (Topic)最新文献_第2页

Electric Current Dependence of Plastic Flow Behavior with Large Tensile Elongation in Tetragonal Zirconia Polycrystal Under a DC Field 直流电场下四边形氧化锆多晶大拉伸伸长率塑性流动行为的电流依赖性

MatSciRN: Other Mechanical Properties & Deformation of Materials (Topic) Pub Date : 2020-10-12 DOI: 10.2139/ssrn.3708740

Y. Sasaki, K. Morita, Takahisa Yamamoto, K. Soga, H. Masuda, H. Yoshida

引用次数: 17

Architecturally Arranged Precipitates Yield a New High Strength Al-Cu-Sc-Zr-Mn Alloy with Exceptional Thermal Stability 组织排列的析出相产生了一种具有优异热稳定性的新型高强度Al-Cu-Sc-Zr-Mn合金

MatSciRN: Other Mechanical Properties & Deformation of Materials (Topic) Pub Date : 2020-09-18 DOI: 10.2139/ssrn.3683528

Lu Jiang, B. Rouxel, T. Langan, T. Dorin

{"title":"Architecturally Arranged Precipitates Yield a New High Strength Al-Cu-Sc-Zr-Mn Alloy with Exceptional Thermal Stability","authors":"Lu Jiang, B. Rouxel, T. Langan, T. Dorin","doi":"10.2139/ssrn.3683528","DOIUrl":"https://doi.org/10.2139/ssrn.3683528","url":null,"abstract":"The refinement and thermal stability of intermediate theta-prime ( θ' ) precipitates are critical in the development of new high strength 2xxx series aluminium-copper (Al-Cu) alloys for high temperature applications. In this work, we use trace additions of Sc, Zr and Mn in an Al-6.5wt.%Cu alloy to refine and stabilise the θ' precipitates. The Al 3 (Sc, Zr) core/shell dispersoids significantly refine the θ' precipitates by acting as preferential nucleation sites during artificial ageing. Adding Mn results in a significant increase of hardness during ageing at 190 °C. Furthermore, hardness is maintained for up to 24 h of thermal exposure at 280 °C. Transmission electron microscopy (TEM) reveals that the addition of Mn leads to a finer and denser distribution of θ' precipitates, and greatly slows the growth and coarsening of the θ' precipitates at elevated temperatures. Differential scanning calorimetry (DSC) shows that this can be attributed to an enhanced nucleation and improved coarsening resistance of the θ' precipitates in the presence of Mn. A combination of energy dispersive spectroscopy (EDS) and atom probe tomography (APT) reveals that Mn, Zr and Sc segregate at the Al/ θ' semi-coherent interfaces. This segregation lowers the interfacial energy of the θ' precipitates and provides a barrier for solute drag, thus lowering the nucleation energy and enhancing their thermal stability. A final benchmark reveals that the Al-Cu-Sc-Zr-Mn alloy surpasses other common elevated temperature high strength Al alloys.","PeriodicalId":442517,"journal":{"name":"MatSciRN: Other Mechanical Properties & Deformation of Materials (Topic)","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130113873","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}

引用次数: 0

Enhanced Fracture Toughness in Ceramic Superlattice Thin Films: On the Role of Coherency Stresses and Misfit Dislocations 陶瓷超晶格薄膜断裂韧性的增强:关于相干应力和错配位错的作用

MatSciRN: Other Mechanical Properties & Deformation of Materials (Topic) Pub Date : 2020-08-31 DOI: 10.2139/ssrn.3694125

A. Wagner, D. Holec, P. Mayrhofer, M. Bartosik

{"title":"Enhanced Fracture Toughness in Ceramic Superlattice Thin Films: On the Role of Coherency Stresses and Misfit Dislocations","authors":"A. Wagner, D. Holec, P. Mayrhofer, M. Bartosik","doi":"10.2139/ssrn.3694125","DOIUrl":"https://doi.org/10.2139/ssrn.3694125","url":null,"abstract":"Superlattice (SL) thin films composed of refractory ceramics unite extremely high hardness and enhanced fracture toughness; a material combination often being mutually exclusive. While the hardness enhancement obtained whentwo materials form a superlattice is well described by existing models based on dislocation mobility, the underlying mechanisms behind the increase in fracture toughness are yet to be unraveled. Here we provide a model based on linear elasticity theory to predict the fracture toughness enhancement in (semi-)epitaxial nanolayers due to coherency stresses and formation of misfit dislocations. We exemplarily study a superlattice structure composed of two cubic transition metal nitrides (TiN, CrN) on a MgO (100) single-crystal substrate. Minimization of the overall strain energy, each time a new layer is added on the nanolayered stack, allows estimating the density of misfit dislocations formed at the interfaces. The evolving coherency stresses, which are partly relaxed by the misfit dislocations, are then used to calculate the apparent fracture toughness of respective SL architectures by applying the weight function method. The results show that the critical stress intensity increases steeply with increasing bilayer period for very thin (essentially dislocation-free) SLs, before the K_IC values decline more gently along with the formation of misfit dislocations. The characteristic K_IC vs. bilayer-period-dependence nicely matches experimental trends. Importantly, all critical stress intensity values of the superlattice films clearly exceed the intrinsic fracture toughness of the constituting layer materials, evincing the importance of coherency stresses for increasing the crack growth resistance.","PeriodicalId":442517,"journal":{"name":"MatSciRN: Other Mechanical Properties & Deformation of Materials (Topic)","volume":"125 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130933704","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}

引用次数: 12

Stability and Rational Design of the ‘Barrelogive’ Type Strengthened Shell Structures Under Combined Loading 复合荷载作用下“桶形”加固壳结构的稳定性与合理设计

MatSciRN: Other Mechanical Properties & Deformation of Materials (Topic) Pub Date : 2020-08-31 DOI: 10.15587/1729-4061.2020.209228

V. Gristchak, D. Hryshchak, N. Dyachenko, Pavlo Degtiarenko

{"title":"Stability and Rational Design of the ‘Barrelogive’ Type Strengthened Shell Structures Under Combined Loading","authors":"V. Gristchak, D. Hryshchak, N. Dyachenko, Pavlo Degtiarenko","doi":"10.15587/1729-4061.2020.209228","DOIUrl":"https://doi.org/10.15587/1729-4061.2020.209228","url":null,"abstract":"This paper reports a study into the stability of a shell structure of the barrel-ogive type, supported by the discretely arranged intermediate frames, under the joint action of the uniform external pressure and axial compressive efforts. A case of the sinusoidal approximation of the meridian of the middle surface of shell compartments has been considered. Governing differential equations have been built to study the stability of a compound shell structure taking into consideration the curvature radii of the \"barrel\" and \"ogive\" compartments under the joint action of axial compression and uniform external pressure. A finite difference method has been used to integrate the fourth-order governing equations with variable coefficients. It is shown that an increase in the meridian curvature parameter exceeding 4 % leads, in some cases that involve the loading by axial forces, to an increase in the critical external pressure by 1.5‒2 times. The effect of stabilizing the growth of critical pressure with an increase in the rigidity of the frames is illustrated for the different values of the meridian curvature and the number of supporting elements. A given effect makes it possible to draw conclusions about the possibility of determining the rational rigidity characteristics of the structure. The effect of increasing critical pressure in the presence of a compressive force in the shells of the positive Gauss curvature, which is the result of internal stretching efforts in the circumference direction, has been investigated. In this case, a generatrix deviation from the ideal shape leads to an increase in wavenumbers in the circumferential direction while the stability is lost, which indicates an increase in the critical pressure. A further increase in the axial compression of the structure leads to the emergence of annular compressive efforts, which is a consequence of the reduction in the critical stresses of external pressure","PeriodicalId":442517,"journal":{"name":"MatSciRN: Other Mechanical Properties & Deformation of Materials (Topic)","volume":"144 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122945182","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}

引用次数: 1

Why did the Scarborough Bluffs Collapse? Earthquakes, Rock Bump, Volcanic Explosions, and Large-Scale Rockslides as a Routine Rock Heaving Process 斯卡伯勒悬崖为什么会崩塌?地震，岩石碰撞，火山爆发，和大规模的岩石滑坡作为常规的岩石隆起过程

MatSciRN: Other Mechanical Properties & Deformation of Materials (Topic) Pub Date : 2020-07-17 DOI: 10.2139/ssrn.3653583

S. Bychkov

{"title":"Why did the Scarborough Bluffs Collapse? Earthquakes, Rock Bump, Volcanic Explosions, and Large-Scale Rockslides as a Routine Rock Heaving Process","authors":"S. Bychkov","doi":"10.2139/ssrn.3653583","DOIUrl":"https://doi.org/10.2139/ssrn.3653583","url":null,"abstract":"The theoretical foundations of the causes of rock swelling took shape in the 60-70s of the last a century and did not receive further development. In this area of the scientific problem, the an illusion has arisen that in the mining and geophysical fields of research, the process of rock swelling takes up an insignificant place, it has been completely studied, and it makes no sense to look for new approaches to explain it. But scientific facts strictly indicate that the process of rock swelling is underestimated and is the main cause of earthquakes, rock bump, sudden outbursts of rock and gas, explosions of volcanoes, and landslides. In fact, the process of rock swelling is a process of deformation of rocks with a period of time from several hours to several years with the possibility of avalanche-like swelling of rocks in a short period of time with the appearance of a force pulse in the form of a shock wave, which can cause an earthquake, volcano explosion, rock-slide, rock bump, the sudden outburst of rock and gas in the mines. The article substantiates the hypothesis of an avalanche-like restructuring of the crystal lattice of a geological body and, as a consequence of this process, to a lightning-fast change in its volume, that is, to the process of heaving of rocks at a high speed, which, in our opinion, is the cause of the collapse of The Scarborough Bluffs, Toronto, Canada on 23.08. 2020, earthquakes, rock bumps, volcanic explosions, and landslides.","PeriodicalId":442517,"journal":{"name":"MatSciRN: Other Mechanical Properties & Deformation of Materials (Topic)","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-07-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127329358","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}

引用次数: 0

Moisture Redistribution Mechanisms in Granular Mineral Fertilizers During Their Storage and Transportation 颗粒状矿质肥料储运过程中水分再分配机制研究

MatSciRN: Other Mechanical Properties & Deformation of Materials (Topic) Pub Date : 2020-05-21 DOI: 10.2139/ssrn.3607002

V. Sokolov, N. Nikolaeva, I. Pochitalkina, I. Kochetova

{"title":"Moisture Redistribution Mechanisms in Granular Mineral Fertilizers During Their Storage and Transportation","authors":"V. Sokolov, N. Nikolaeva, I. Pochitalkina, I. Kochetova","doi":"10.2139/ssrn.3607002","DOIUrl":"https://doi.org/10.2139/ssrn.3607002","url":null,"abstract":"Long-term transportation and numerous transshipment procedures, in particular in hot and humid climate, cause the issue of preserving the consumer qualities of mineral fertilizers – the key issue for the industry as a whole. For Russian fertilizer producers it is especially important, as they supply huge amounts of fertilizers to the countries of Southeast Asia and South America.<br><br>In the case of granular NP and NPK-fertilizers, the mechanisms of moisture redistribution in the fertilizer array are shown both during bulk storage of the product and during storage in big bags.<br><br>The hygroscopic characteristics of the main grades of NP and NPK-fertilizers based on ammonium phosphates - polytherms of moisture sorption - were determined. Based on the data obtained, there is showed the effect of the conditions of storage and handling of mineral fertilizers (temperature and relative humidity of ambient air, as well as the dynamics and cyclical nature of changes occurring to the fertilizers, storage time, etc.) on preserving of their consumer properties – moist content and strength of the granules, caking and dust formation. The research results are confirmed by lab and practical tests.","PeriodicalId":442517,"journal":{"name":"MatSciRN: Other Mechanical Properties & Deformation of Materials (Topic)","volume":"126 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127430785","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}

引用次数: 0

High-Throughput Mapping Method for Mechanical Properties, Oxidation Resistance, and Phase Stability in Ni-Based Superalloys Using Composition-Graded Unidirectional Solidified Alloys 基于成分梯度单向凝固合金的ni基高温合金力学性能、抗氧化性和相稳定性的高通量映射方法

MatSciRN: Other Mechanical Properties & Deformation of Materials (Topic) Pub Date : 2020-03-20 DOI: 10.2139/ssrn.3552429

A. Ikeda, Kenta Goto, T. Osada, I. Watanabe, K. Kawagishi

引用次数: 9

Sea Shell: A Marine Waste to Filler in Polymer Composite 海贝壳:海洋废弃物在高分子复合材料中的填料

MatSciRN: Other Mechanical Properties & Deformation of Materials (Topic) Pub Date : 2020-03-06 DOI: 10.2139/ssrn.3549802

Manoj Kumar, Hemalata Jena

引用次数: 3

Enhanced Radiation Tolerance of the Ni-Co-Cr-Fe High-Entropy Alloy as Revealed from Primary Damage 从初损伤看Ni-Co-Cr-Fe高熵合金增强的辐射耐受性

MatSciRN: Other Mechanical Properties & Deformation of Materials (Topic) Pub Date : 2020-03-02 DOI: 10.2139/ssrn.3542922

Yeping Lin, Tengfei Yang, Lin Lang, Ch. Shan, H. Deng, Wangyu Hu, F. Gao

{"title":"Enhanced Radiation Tolerance of the Ni-Co-Cr-Fe High-Entropy Alloy as Revealed from Primary Damage","authors":"Yeping Lin, Tengfei Yang, Lin Lang, Ch. Shan, H. Deng, Wangyu Hu, F. Gao","doi":"10.2139/ssrn.3542922","DOIUrl":"https://doi.org/10.2139/ssrn.3542922","url":null,"abstract":"Abstract High-entropy alloys (HEAs) have received much attention for the development of nuclear materials because of their excellent irradiation tolerance. In the present study, the generation and evolution of irradiation-induced defects in the NiCoCrFe HEA were investigated by molecular dynamics (MD) simulations to understand the mechanisms of its irradiation tolerance compared with bulk Ni. The displacement cascades were simulated for the energies of primary knock-on atoms (PKA) ranging from 10 to 50 keV to understand the irradiation resistance in HEAs. In general, there are more displaced atoms produced in the thermal spike phase, but fewer defects survived at the end of the cascades in the NiCoCrFe alloy than in Ni. Both interstitial and vacancy clusters increase in size or number with increasing PKA energy in both materials, but they do so more slowly in the NiCoCrFe HEA. The delayed damage accumulations in the NiCoCrFe HEA are attributed to the high defect recombination caused by the following two mechanisms. First, the enhanced thermal spike and the low thermal conductivity of HEAs for heat dissipation result in the higher efficiency of defect recombination. Furthermore, the substantially small binding energies of interstitial loops in the NiCoCrFe HEA, as compared with those in Ni, are responsible for the delayed interstitial clustering in the NiCoCrFe HEA.","PeriodicalId":442517,"journal":{"name":"MatSciRN: Other Mechanical Properties & Deformation of Materials (Topic)","volume":"487 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-03-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132829698","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}

引用次数: 93

Structural Heterogeneity, Ductility, and Glass Forming Ability of Zr-Based Metallic Glasses zr基金属玻璃的结构非均质性、延展性和玻璃成形能力

MatSciRN: Other Mechanical Properties & Deformation of Materials (Topic) Pub Date : 2020-02-21 DOI: 10.2139/ssrn.3683539

Soohyun Im, P. Zhao, G. Yoo, Zhen Chen, Gabriel Calderon, Mehrdad Abbasi Gharacheh, Menglin Zhu, O. Licata, B. Mazumder, D. Muller, E. Park, Yunzhi Wang, Jinwoo Hwang

引用次数: 2