MatSciRN: Other Materials Processing & Manufacturing (Topic)最新文献

{"title":"Aupdagpt Noble High Entropy Alloy and its Surface: A Density Functional Theory Study","authors":"Jingming Shi, N. Hashimoto","doi":"10.2139/ssrn.3542977","DOIUrl":"https://doi.org/10.2139/ssrn.3542977","url":null,"abstract":"The fundamental properties of AuPdAgPt alloy and its low index surfaces are studied with density functional theory calculation. AuPdAgPt alloy shows good thermodynamic stability with negative formation enthalpy and cohesive energy. Charge transfer between solutes within AuPdAgPt alloy is confirmed, and Pt atom is the main electrons donor, while Pd atom is the main electrons acceptor. The local structural disorder in AuPdAgPt surface layer is stronger than it in bulk. Moreover, the work function of AuPdAgPt surfaces is small compared with that of Au, Pd and Pt.","PeriodicalId":18300,"journal":{"name":"MatSciRN: Other Materials Processing & Manufacturing (Topic)","volume":"27 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73827850","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}

{"title":"Hydrogen Concentration-Induced Stresses in an Environmental TEM","authors":"M. Connolly, Veruska Malavé, May L. Martin","doi":"10.2139/ssrn.3674188","DOIUrl":"https://doi.org/10.2139/ssrn.3674188","url":null,"abstract":"The Hydrogen Enhanced Localized Plasticity (HELP) mechanism is a leading candidate among proposed Hydrogen Embrittlement (HE) mechanisms. Transmission Electron Microscopy (TEM) measurements of an increased dislocation mobility upon exposure to hydrogen provide the most direct evidence for the HELP mechanism. However, the electron beam in TEM microscopes can dissociate hydrogen, leading to a hydrogen fugacity much greater than the applied pressure. Such high fugacity will generate a large concentration gradient between the surface and interior of a TEM sample. It has been proposed that the observed dislocation mobility is due only to concentration-gradient stresses rather than an effect of the interaction with hydrogen. Here we calculate the expected stresses for H/Fe system to be an order of magnitude too low to impact dislocation mobility, and we show that the concentration gradient-induced stresses dissipate quickly in both H/Fe and H/Ni systems - well before observation by TEM would occur.","PeriodicalId":18300,"journal":{"name":"MatSciRN: Other Materials Processing & Manufacturing (Topic)","volume":"54 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73514896","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}

{"title":"Prediction of Maximum Fatigue Indicator Parameters for Duplex Ti-6Al-4V Using Extreme Value Theory","authors":"T. Gu, Krzysztof S. Stopka, C. Xu, D. McDowell","doi":"10.2139/ssrn.3499072","DOIUrl":"https://doi.org/10.2139/ssrn.3499072","url":null,"abstract":"Fatigue Indicator Parameters (FIPs) based on the cyclic plastic strain are used as surrogate measures of the driving force for fatigue crack formation. For a given microstructure, the Extreme Value Distribution (EVD) of FIPs can be populated using results of a number of digital Statistical Volume Element (SVE) instantiations analyzed by the crystal plasticity finite element method. The number of microstructure instantiations affects the maximum FIPs computed. To predict the maximum FIPs in a large volume of material using simulation results from a limited number of SVEs, we proposed a statistical approach based on extreme value theory. The predicted maximum FIP values are compared directly to simulation results of 1000 SVEs to validate the proposed method for duplex Ti-6Al-4V. It is shown that simulations of only 100 SVEs suffice to identify the statistical information for a reliable prediction of the maximum FIPs in polycrystalline duplex Ti-6Al-4V with initial random texture.","PeriodicalId":18300,"journal":{"name":"MatSciRN: Other Materials Processing & Manufacturing (Topic)","volume":"68 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-12-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89852115","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}

{"title":"Microstructure and Creep Performance of a Multicomponent Co-Based L1 2-Ordered Intermetallic Alloy","authors":"F. Long, S. Baik, D. Chung, F. Xue, E. Lass, D. Seidman, D. Dunand","doi":"10.2139/ssrn.3499089","DOIUrl":"https://doi.org/10.2139/ssrn.3499089","url":null,"abstract":"The chemistry, thermodynamics and mechanical properties of the L1₂-ordered Co₃(Al,W) γ'-phase are crucial for understanding γ(f.c.c.)/γ'(L1₂) cobalt-based superalloys. A single-phase γ'(L1₂) alloy with the composition Co-30Ni-11Al-5.5W-4Ti-2.5Ta-0.10B (at.%) and a γ'-solvus temperature of 1268°C was recently identified using a Calphad-methodology. Scanning and transmission electron microscopy reveals that the single-phase microstructure is stable at 900 and 1000 °C for 1000 h and at 1100 °C for 168 h, without other phases being observed, resulting in similar levels of microhardness for all annealing temperatures. Atom-probe tomography confirms the presence of a single-phase γ'(L1₂)-microstructure with a composition of (Co,Ni)₃(Al,W,Ti,Ta,B). Grain boundaries exhibit depletion of Co, Ni, W and Ta and enrichment of Al and B. A remarkable yield stress anomaly is observed, with the yield strength increasing from ~300 to ~700 MPa from room temperature to 800°C, which is stronger than Co₃(Al,W)(L12) and Ni₃Al(L1₂). The creep tests at 850 and 950 °C display power-law behavior with a stress exponent of n = 3.7 and an activation energy for L26 of Q_n = 497 kJ/mol, similar to that of single-phase Ni₃Al(L1₂) compound (Q_n = 406-421 kJ/mol).","PeriodicalId":18300,"journal":{"name":"MatSciRN: Other Materials Processing & Manufacturing (Topic)","volume":"5 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-12-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91193653","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}

{"title":"Practical low-cost method to sustain mine compressed air savings","authors":"G. E. Mathews, J. Taljaard, J. V. van Laar, J. Vosloo, E. Mathews","doi":"10.2139/ssrn.3656590","DOIUrl":"https://doi.org/10.2139/ssrn.3656590","url":null,"abstract":"Efforts to ensure a sustained growth path for the mining industry are vital for its survival, as well as the communities that depend on it. Mining companies in South Africa thus need to focus on reducing their operational costs in order to remain competitive. Mines can reduce their operational costs by optimising compressed air production and curbing oversupply. However, complex and expensive solutions are impractical, and the need for a simple, lowcost solution to match compressed air supply with the required demand is evident. A simplistic and inexpensive step-by-step methodology was subsequently developed. The methodology focused on identifying cost-saving initiatives to reduce compressed air network inefficiencies. These inefficiencies were evaluated, and a suitable solution strategy was developed. The methodology was implemented on the compressed air network of Mine A and proved to have no negative effects on the production of the mine, while annual energy cost savings of R1,1-million were shown to be viable. <br>","PeriodicalId":18300,"journal":{"name":"MatSciRN: Other Materials Processing & Manufacturing (Topic)","volume":"1929 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-11-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91090129","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}

{"title":"Digital Piracy and Bundling of Information Goods","authors":"Chenguang (Allen) Wu, Chen Jin, Atanu Lahiri","doi":"10.2139/ssrn.3336488","DOIUrl":"https://doi.org/10.2139/ssrn.3336488","url":null,"abstract":"Bundling of information goods is quite common. As prior research shows, bundling is particularly profitable in their case because their marginal production cost is zero. However, information goods are known to be prone to piracy, and it is still not clear what impact, if any, piracy can have on the appeal of bundling. To address this, we reexamine bundling in the backdrop of piracy. We find that piracy diminishes the appeal of bundling to the extent that selling separately may become optimal despite zero marginal cost. Interestingly, even when product valuations are negatively correlated and bundling is anticipated to be even more effective, separate selling can be surprisingly optimal in the presence of piracy. This impact of piracy carries over to situations where a fraction of the users are ethical and do not consider piracy to be an option. Furthermore, piracy elevates the relative appeal of separate selling so much so that even mixed bundling becomes ineffective in certain situations. Collectively, our results point to the insight that the purported benefits of bundling may not fully materialize in the presence of piracy.","PeriodicalId":18300,"journal":{"name":"MatSciRN: Other Materials Processing & Manufacturing (Topic)","volume":"48 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-07-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86131855","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}

{"title":"Preparing a Composite Including SnS 2, Carbon Nanotubes and S and Using as Cathode Material of Lithium-Sulfur Battery","authors":"Wu Jun, C. Bing, L. Qingqing, Hu Ailin, L. Xiaoying, J. Qi","doi":"10.2139/ssrn.3427488","DOIUrl":"https://doi.org/10.2139/ssrn.3427488","url":null,"abstract":"A new SnS₂/CNTs/S composite is prepared and used as the lithium-sulfur battery cathode material. SnS₂ works as the adsorbent to hinder or reduce the shuttle effect of lithium polysulfides. CNTs work as the conductive network of the composite. The synergistic effect come from the SnS₂ and CNTs commits to the Li-S battery electrochemical performance. The composite has shown a good electrochemical performance: the first discharge capacity is 1308.6 mAh g^-1 (0.1 C) and a reversible capacity of 1002.3mAh.g^-1 after 100 cycles, indicating a good potential application.","PeriodicalId":18300,"journal":{"name":"MatSciRN: Other Materials Processing & Manufacturing (Topic)","volume":"39 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-07-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88586650","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}

{"title":"Characterization of Twin Transmission Structure of High Manganese Austenitic Steel by High-Resolution Transmission Electron Microscopy","authors":"Zhenyu Liu, Guo-dong Wang, Jun Chen","doi":"10.2139/ssrn.3427466","DOIUrl":"https://doi.org/10.2139/ssrn.3427466","url":null,"abstract":"Atomic-scale twin transmission structures were clearly characterized by high-resolution transmission electron microscopy. Two different twin transmission structures are found during another variant twin \"transmitting across\" pre-existing twins: dislocation twin transmission structure and local crystal reorientation twin transmission structure. In addition, twin-twin interactions can induce the formation of other structures, such as double twins, stacking faults and few e-martensite, and coherent twin boundaries of two variants twins can simultaneously migrate, appearing as if a twin partly penetrates the other one.","PeriodicalId":18300,"journal":{"name":"MatSciRN: Other Materials Processing & Manufacturing (Topic)","volume":"5 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-07-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77109894","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}

{"title":"Anisotropic Grain Growth in Iron-Carbon Films at High Electric Current Densities","authors":"Thomas Brede, R. Kirchheim, C. Volkert","doi":"10.2139/ssrn.3427487","DOIUrl":"https://doi.org/10.2139/ssrn.3427487","url":null,"abstract":"Abstract We investigate the effect of direct electric current (DC) on grain growth in 100 nm thick iron-carbon films with carbon concentrations between 0.7 to 4.4 at%. The application of DC-current during annealing at 550 °C confirms the expected transport of carbon in the direction of the electric current and the unexpected formation of elongated, abnormally large carbide and ferrite grains along the current direction in the carbon-rich regions. The formation of elongated grains is explained by electromigration-induced carbon flux divergences that result from the carbide precipitates. This presents a possible scenario for controlling microstructure evolution in iron by using DC electric currents. Changes for alternating current (AC) pulses had been observed before.","PeriodicalId":18300,"journal":{"name":"MatSciRN: Other Materials Processing & Manufacturing (Topic)","volume":"4 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-07-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84429211","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}

{"title":"Treatment of Water by Tamarugite Produced from White Aluminium Dross","authors":"D. Gautam, Anant Jain, Arunabh Meshram, K. Singh, D. Mohan","doi":"10.2139/ssrn.3407800","DOIUrl":"https://doi.org/10.2139/ssrn.3407800","url":null,"abstract":"Aluminium dross is an industrial hazardous by-product obtained in aluminium smelter plants in large quantities. Dross when subjected to water bodies decreases the groundwater pH and presence of leachable salts like NaCl and KCl in dross increases the environmental crisis (Meshram and Singh, 2018). Usually white dross has adequate metallic aluminium content that is extracted through existing pyrometallurgical and hydrometallurgical routes. Even though dross may be recycled using these technologies, large quantities of dross remains end up being land filled. This research work emphasizes on synthesis of an inorganic coagulant, tamarugite, by utilizing the aluminium content entrapped in the dross. Application of tamarugite, being a rare mineral, has not been thoroughly examined but the authors have observed the use of manufactured mineral as a coagulant in water treatment (Meshram et al. 2019).<br><br>In this work, white aluminium dross is subjected to leaching with concentrated sulphuric acid. Analysis of aluminium content was being done by EDTA-EBT back titrations. Subsequently equimolar sodium hydroxide solution is added to the filtrate obtained after leaching. This solution is heated to saturation. As a solvent ethanol is employed to precipitate hydrophilic molecules of tamarugite from the saturated solution. The precipitate is decanted, washed with methanol and stored in desiccator is characterized with respect to phase, elemental, microstructural and thermal analysis. Authors have studied its coagulation potential for various types of water under different ranges of pH. Obtained sludge has been examined using EDS to understand further about the heavy metal removal. Comparison between tamarugite and various commercial coagulants has been done by Jar test. Therefore, a unique method of treating water from an industrial waste is proposed that connects solid waste management and water treatment. Development of number of such valuable products from various waste materials is an exciting aspect of industrial waste management engineering, which is the crux of sustainable development.","PeriodicalId":18300,"journal":{"name":"MatSciRN: Other Materials Processing & Manufacturing (Topic)","volume":"162 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-06-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80240290","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}