Materials Processing & Manufacturing eJournal最新文献

{"title":"Deformed Microstructure Characteristics and Nano-Mechanical Properties of CuSn10P1 Alloy","authors":"Quiping Wang, R. Zhou, Yongkun Li, Chunjian Wang","doi":"10.2139/ssrn.3680271","DOIUrl":"https://doi.org/10.2139/ssrn.3680271","url":null,"abstract":"Enclosed cooling slope channel was adopted to prepare CuSn10P1 semi-solid sample. Compared with as-cast sample by conventional liquid forming, the brittle phases among intergranular microstructure reduced, which prevented the risk of thermal cracks. During hot deformation process, the formation and movement of dislocations results in slipping bands. The β' -Cu13.7Sn phase balanced the Young's modulus in the microstructure and improved the ability of coordinated deformation among grains. These findings provide a theoretical guidance for semi-solid CuSn10P1 deformation process.","PeriodicalId":18731,"journal":{"name":"Materials Processing & Manufacturing eJournal","volume":"28 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82334006","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":"Oxide Dispersoid Strengthened CoCrFeMnNi High-Entropy Alloy: The Effects of Y2O3 Addition and Y Alloying","authors":"Seunghyeok Chung, Bin Lee, S. Lee, Changwoo Do, H. Ryu","doi":"10.2139/ssrn.3680402","DOIUrl":"https://doi.org/10.2139/ssrn.3680402","url":null,"abstract":"Oxide dispersion strengthened CoCrFeMnNi high-entropy alloys (ODS-HEAs) were prepared using two different powder preparation methods classified by yttrium addition strategy to investigate the effects of in-situ and ex-situ oxide dispersoid formation on the microstructure and mechanical properties. Systematic microstructural analysis was carried out by X-ray diffraction (XRD), electron backscattered diffraction (EBSD), high-resolution transmission electron microscopy (HRTEM), atom probe tomography (APT), and small-angle neutron scattering (SANS). Cryo-milled powder analysis, grain structure evolution after spark plasma sintering, dispersoid characteristics, and matrix/dispersoid interface structure analysis of the in-situ and ex-situ dispersoids within the high-entropy alloy (HEA) matrix were performed. In-situ and ex-situ dispersoid formations were observed in the Y2O3-added ODS-HEA, whereas the in-situ dispersoid formation was dominantly observed in the Y-alloyed ODS-HEA through the construction of a coherent interface relationship with complex chemical compositions. In-situ oxide dispersoids enhance the construction of ultrafine-grained structures up to approximately 300 nm in diameter. This study shows that the pre-alloying method, in which yttrium is alloyed, is efficient in achieving fine coherent dispersoids with an ultrafine-grained structure, resulting in a significant enhancement of the tensile strength of the CoCrFeMnNi HEA.","PeriodicalId":18731,"journal":{"name":"Materials Processing & Manufacturing eJournal","volume":"330 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73130380","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":"Highly Efficient Diffusion TbF 3 to Enhance the Coercivity of Sintered Nd-Fe-B Magnet by Cu Addition","authors":"Shuwei Zhong, San-lian Luo, Liuyimei Yang, S. Rehman, Yue Wu, Yaojun Lu, Munan Yang, Bin Yang","doi":"10.2139/ssrn.3708688","DOIUrl":"https://doi.org/10.2139/ssrn.3708688","url":null,"abstract":"In this paper, Cu element was added to the grain boundary of sintered Nd-Fe-B magnet to form a low melting point alloy phase in the grain boundary to promote the diffusion depth of Tb element. The intrinsic coercivity of the magnet with 0.2 % Cu addition increased significantly from 16.07 kOe for standard alloy without Cu to 24.38 kOe after the diffusion of TbF3 . The squareness of the demagnetization curves is maintained at 94 %, ensuring a good diffusion efficiency and uniformity. EPMA analysis showed that the distribution depth of (Nd, Tb) 2 Fe 14 B core-shell layer of the magnet was increased from 50 μm to 145 μm after the diffusion. The addition of Cu increased the ratio and average area of the grain boundary phases effectively, and formed a good diffusion channel. A larger amount of (Nd, Tb) 2 Fe 14 B shell layers formed in the magnet as a result of TbF 3 diffusion in Cu added magnets and which increased the intrinsic coercivity due to enhanced magnetocryalline anisotropy and favorable microstructure.In this paper, Cu element was added to the grain boundary of sintered Nd-Fe-B magnet to form a low melting point alloy phase in the grain boundary to promote the diffusion depth of Tb element. The intrinsic coercivity of the magnet with 0.2 % Cu addition increased significantly from 16.07 kOe for standard alloy without Cu to 24.38 kOe after the diffusion of TbF3 . The squareness of the demagnetization curves is maintained at 94%, ensuring a good diffusion efficiency and uniformity. EPMA analysis showed that the distribution depth of (Nd, Tb) 2 Fe 14 B core-shell layer of the magnet was increased from 50 μm to 145 μm after the diffusion. The addition of Cu increased the ratio and average area of the grain boundary phases effectively, and formed a good diffusion channel. A larger amount of (Nd,Tb)2Fe14B shell layers formed in the magnet as a result of TbF3 diffusion in Cu added magnets which increased the intrinsic coercivity due to enhanced magnetocryalline anisotropy and favorable microstructure.","PeriodicalId":18731,"journal":{"name":"Materials Processing & Manufacturing eJournal","volume":"28 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83594820","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, Microhardness and Machining Characteristics of Al6063-SiC Composites","authors":"R. Lam, Yogesh Venkatesan, S. Irullappasamy, T. K. Mahanta, R. Dumpala, R. B.","doi":"10.2139/ssrn.3671806","DOIUrl":"https://doi.org/10.2139/ssrn.3671806","url":null,"abstract":"Machining of materials is an important operation in the manufacturing industry to develop different structures. Compared with metals and alloys, metal matrix composites (MMCs) respond differently during machining due to the presence of different phases possessing different physical and mechanical properties. In the present study, machining behavior of Al6063-SiC composites has been investigated to assess the role of dispersing phase on machining characteristics. Composites with varying SiC content (4% and 8% by Wt.) were produced by stir casting. From the micro structural studies, decreased grain size was observed with increased SiC dispersion. Higher hardness was measured for the composite with 4% SiC. From the machining studies during turning experiments, the variations within the cutting forces was found to be higher for the composites compared with the base material. Cutting forces were also measured as increased with the increase of SiC dispersion. From the results, it can be understood that the presence of SiC significantly influence the machining behavior of Al6063-SiC composites which is a valid factor must be considered while performing turning operations.","PeriodicalId":18731,"journal":{"name":"Materials Processing & Manufacturing eJournal","volume":"44 3 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90483573","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":"Solidification and Melting Phase Change Behavior of Eutectic Gallium-Indium-Tin","authors":"Amanda S. Koh, Seth Chun, Wonseok Hwang, P. Zavalij, Geoffrey A. Slipher, R. Mrozek","doi":"10.1016/j.mtla.2019.100512","DOIUrl":"https://doi.org/10.1016/j.mtla.2019.100512","url":null,"abstract":"","PeriodicalId":18731,"journal":{"name":"Materials Processing & Manufacturing eJournal","volume":"92 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85175408","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":"From Electricity to Fuels: Descriptors for C 1 Selectivity in Electrochemical CO 2 Reduction","authors":"Michael T. Tang, Hongjie Peng, Philomena Schlexer Lamoureux, M. Bajdich, F. Abild-Pedersen","doi":"10.2139/ssrn.3479447","DOIUrl":"https://doi.org/10.2139/ssrn.3479447","url":null,"abstract":"Electrochemical reduction of carbon dioxide (CO2)\u0000over transition metals follows a complex reaction network. Even for products\u0000with a single carbon atom (C1 products), two bifurcated pathways\u0000exist: initially between carboxyl (COOH*) and formate (HCOO*) intermediates and\u0000the COOH* intermediate is further bifurcated by pathways involving either formyl\u0000(CHO*) or COH*. In this study, we combine evidence from the experimental\u0000literature with a theoretical analysis of energetics to rationalize that not\u0000all steps in the reduction of CO2 are electrochemical. This insight\u0000enables us to create a selectivity map for two-electron products (carbon\u0000monoxide (CO) and formate) on elemental metal surfaces using only the CO and OH\u0000binding energies as descriptors. In the further reduction of CO*, we\u0000find that CHO* is formed through a chemical step only whereas COH* follows from\u0000an electrochemical step. Notably on Cu(100), the COH pathway becomes dominant\u0000at an applied potential lower than −0.5V vs. RHE. For the\u0000elemental metals selective towards CO formation, the variation of the CO\u0000binding energy is sufficient to further subdivide the map into domains that\u0000predominantly form H2, CO, and ultimately more reduced products. We\u0000find Cu to be the only elemental metal capable of reducing CO2 to\u0000products beyond 2e− via the proposed COH pathway and we identify atomic\u0000carbon as the key component leading to the production of methane. Our analysis also\u0000rationalizes experimentally observed differences in products between thermal\u0000and electrochemical reduction of CO2 on Cu.","PeriodicalId":18731,"journal":{"name":"Materials Processing & Manufacturing eJournal","volume":"68 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72744460","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":"Catalyzing Zinc-Ion Intercalation in Hydrated Vanadates for Aqueous Zinc-Ion Batteries","authors":"Chaofeng Liu, M. Tian, Mingshan Wang, Jiqi Zheng, Shuhua Wang, Mengyu Yan, Zhaojie Wang, Zhengmao Yin, Jihui Yang, G. Cao","doi":"10.2139/ssrn.3474682","DOIUrl":"https://doi.org/10.2139/ssrn.3474682","url":null,"abstract":"The partially unfilled 3d orbitals in Cu(ii) can capture and transfer electrons in the redox reactions as expected from a catalytic function and promote the Zn-ion storage reaction kinetics in aqueous batteries.","PeriodicalId":18731,"journal":{"name":"Materials Processing & Manufacturing eJournal","volume":"8 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75430829","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":"Achieving Bi-Lamellar Microstructure with Both High Tensile Strength and Large Ductility in Ti-6Al-4V Alloy by Novel Thermomechanical Processing","authors":"Yan Chong, T. Bhattacharjee, J. Yi, Shiteng Zhao, N. Tsuji","doi":"10.2139/ssrn.3436426","DOIUrl":"https://doi.org/10.2139/ssrn.3436426","url":null,"abstract":"In this study, a novel through-β-transus processing followed by intercritical annealing was designed to obtain the bi-lamellar microstructure in Ti-6Al-4V alloy with refined colony sizes, by which both tensile strength and ductility were significantly improved. The colony size obtained in the through-β-transus processing was 60 μm, much smaller than the minimum colony size of 130 μm that can be achieved in the conventional β processing. The colony refinement was attributed to the decreased size of the grain boundary α phase with increased variety of crystallographic orientations, which acted as nucleation sites for subsequent colony structures. By intercritical annealing of the lamellar microstructures in α+β two-phase region followed by water quenching, bi-lamellar microstructures composed of primary α lamellae and transformed β regions composed of fine secondary α plates were obtained, maintaining the same colony size as the lamellar precursors. The total elongation of bi-lamellar microstructure significantly improved from 3.4% to 18.6% with decreasing the colony size, while the high yield and tensile strength was independent of the colony size. SEM-EBSD characterization of the bi-lamellar microstructures at interrupted tensile strains clarified that deformation behaviors of the bi-lamellar microstructures after yielding were mainly controlled by micro-shear bands across transformed β regions, which eventually evolved into micro-cracks at higher tensile strains. It was considered that the strain compatibility accommodated by the differently aligned micro-shear bands formed within different colonies was the main reason for delaying tensile fracture in the bi-lamellar microstructure with the smaller colony size.","PeriodicalId":18731,"journal":{"name":"Materials Processing & Manufacturing eJournal","volume":"16 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-08-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82524796","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":"Experimental Investigation and Optimisation of Treatment Parameters in Plasma Arc Cutting of D3 Tool Steel by Response Surface Modification","authors":"S. Venkatesan, P. Mohan, T. Ranjith Kumar, E. Artralarasan","doi":"10.2139/ssrn.3430314","DOIUrl":"https://doi.org/10.2139/ssrn.3430314","url":null,"abstract":"Currently with the rise in competition in market and deliver the goods high accuracy is very extremely tough the non-conventional machining like PAC (plasma arc cutting) is become life line of any business. Plasma arc cutting (PAC) is wide used treatment for the cutting of various varieties of metals in many in operation operating conditions. PAC is taken into account a difficult technology compared to its main competitors: oxy-fuel and optical master cutting. Today, thanks to advances in instrumentation style and improvement in cut quality. This paper delivers the result and constant optimisationof method parameters for the treatment of plasma arc cutting (PAC) of d3 tool steel. Gas force per unit area, arc rent and speed these are the 3 parameters of this treatment. The fabric material removal rate (MRR) is take process response .for maximum MRR treatment parameters are optimised supported the RSM technique including analysis of variance. Analysis of variance (ANOVA) is perform and contribute every treatment parameters and its have an effect on the response.","PeriodicalId":18731,"journal":{"name":"Materials Processing & Manufacturing eJournal","volume":"22 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91161781","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":"Design and Simulation of Dual Polarized Patch Antenna","authors":"B.M Sachin, Dr. Shushrutha K.S","doi":"10.34218/ijaret.10.4.2019.002","DOIUrl":"https://doi.org/10.34218/ijaret.10.4.2019.002","url":null,"abstract":"A single layer dual-polarized.microstrip patch antenna with dual port is designed, simulated and analyzed. The two ports are provided with a 1800 phase shift and designed to operate in the C-band with a solution frequency at 4GHz. The edges of the patch are etched which helps to improve the polarization of the designed antenna. The inset feed is the feeding technique used for the design of the dual-polarized antenna which provides a gain of about 8.5dB. This paper describes the parameters of the dual-polarized patch antenna like VSWR, Radiation Pattern, Axial Ratio and Return Loss are simulated and results are recorded. The proposed antenna works for the single narrow band frequency having a return loss lesser than -10dB and finds its application in satellite communications and weather RADAR.","PeriodicalId":18731,"journal":{"name":"Materials Processing & Manufacturing eJournal","volume":"26 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-07-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75109493","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}