D. Dubina, L. Czechowski, M. Kotełko, V. Ungureanu
The paper presents the results of a numerical parametric study into the influence of relatively large load eccentricities with respect to minor and major axis upon buckling strength and buckling modes of thinwalled cold-formed steel lipped channel section columns subjected to eccentric compression. The study was performed using Finite Element Method (code Ansys) and Finite Strip Method (code CUFSM). Selected theoretical results were compared with experimental test results. Some conclusions concerning sensitivity of buckling strength and redundancy of load-carrying capacity in the post-buckling (either elastic-plastic or plastic) range to the magnitude of eccentricity, depending on the eccentricity position (minor/major axis) and column dimensions are derived.
{"title":"Some aspects of buckling behavior of channel section members under eccentric compression","authors":"D. Dubina, L. Czechowski, M. Kotełko, V. Ungureanu","doi":"10.2139/ssrn.3867138","DOIUrl":"https://doi.org/10.2139/ssrn.3867138","url":null,"abstract":"The paper presents the results of a numerical parametric study into the influence of relatively large load eccentricities with respect to minor and major axis upon buckling strength and buckling modes of thinwalled cold-formed steel lipped channel section columns subjected to eccentric compression. The study was performed using Finite Element Method (code Ansys) and Finite Strip Method (code CUFSM). Selected theoretical results were compared with experimental test results. Some conclusions concerning sensitivity of buckling strength and redundancy of load-carrying capacity in the post-buckling (either elastic-plastic or plastic) range to the magnitude of eccentricity, depending on the eccentricity position (minor/major axis) and column dimensions are derived.","PeriodicalId":18286,"journal":{"name":"MatSciRN: Lightweight Alloys (Topic)","volume":"22 2 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75705686","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}
Zouhair Lakbaibia, M. Damej, A. Molhi, M. Benmessaoud, S. Tighadouini, A. Jaafar, T. Benabbouha, A. Ansari, A. Driouich, M. Tabyaoui
The exploitation of cost-effective, sustainable, green and efficient compounds is a renewed science and a demanding mission for today’s chemists and technologists. In this view, the inhibitive corrosion properties of some hydrazine derivatives named (1E,2E) -bis(1-(2-nitrophenyl)ethylidene)hydrazine ( SSBO ), (1E,2E) -bis(1-(3-nitrophenyl)ethylidene)hydrazine ( SSBM ) and (1E,2E) -bis(1-(4-nitrophenyl)ethylidene)hydrazine ( SSBP ) on the C38 steel corrosion in 1M HCl media has been evaluated by different techniques like electrochemical impedance spectroscopy (EIS), potentiodynamic polarization (PDP), scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy. The EIS results showed that SSBM is the greatest inhibitor (η>93%) among the three tested compounds. The SSBM gives considerable inhibition efficiency against corrosion of steel compared to the previous studies. The PDP curves indicated that the studied inhibitors were a mixed-type inhibitor with a predominantly cathodic control. Quantum calculations of some descriptors derived from the density functional theory (DFT), the transition state theory (TST), the quantum theory of atoms in molecules (QTAIM) and molecular dynamics simulation have delivered helpful information regarding electron transfer and mechanism during adsorption of inhibitors on C38 steel surface.
{"title":"Evaluation of Inhibitive Corrosion Potential of Some Symmetrical Hydrazine Derivatives Containing Nitrophenyl Moiety In Molar Hydrochloric Acid for C38 Steel Metal: Experimental, Chemical Quantum and Molecular Dynamics Studies","authors":"Zouhair Lakbaibia, M. Damej, A. Molhi, M. Benmessaoud, S. Tighadouini, A. Jaafar, T. Benabbouha, A. Ansari, A. Driouich, M. Tabyaoui","doi":"10.2139/ssrn.3936326","DOIUrl":"https://doi.org/10.2139/ssrn.3936326","url":null,"abstract":"The exploitation of cost-effective, sustainable, green and efficient compounds is a renewed science and a demanding mission for today’s chemists and technologists. In this view, the inhibitive corrosion properties of some hydrazine derivatives named (1E,2E) -bis(1-(2-nitrophenyl)ethylidene)hydrazine ( SSBO ), (1E,2E) -bis(1-(3-nitrophenyl)ethylidene)hydrazine ( SSBM ) and (1E,2E) -bis(1-(4-nitrophenyl)ethylidene)hydrazine ( SSBP ) on the C38 steel corrosion in 1M HCl media has been evaluated by different techniques like electrochemical impedance spectroscopy (EIS), potentiodynamic polarization (PDP), scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy. The EIS results showed that SSBM is the greatest inhibitor (η>93%) among the three tested compounds. The SSBM gives considerable inhibition efficiency against corrosion of steel compared to the previous studies. The PDP curves indicated that the studied inhibitors were a mixed-type inhibitor with a predominantly cathodic control. Quantum calculations of some descriptors derived from the density functional theory (DFT), the transition state theory (TST), the quantum theory of atoms in molecules (QTAIM) and molecular dynamics simulation have delivered helpful information regarding electron transfer and mechanism during adsorption of inhibitors on C38 steel surface.","PeriodicalId":18286,"journal":{"name":"MatSciRN: Lightweight Alloys (Topic)","volume":"33 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74544642","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}
Sun Wenwen, Yuman Zhu, R. Marceau, Lu Jiang, Lingyu Wang, X. Gao, Qi Zhang, C. Hutchinson
The Al-Mg base 5xxx Al alloys are non-heat-treatable. They derive their strength from solid solution and strain hardening. They are, however, supersaturated and this can cause sensitization issues. This work shows that by applying a recently developed cyclic strengthening approach, a high density of Mg-Al clusters can be formed in these materials resulting yield and tensile strengths, and elongations, superior to the precipitation hardened AA6061 (Al-Mg-Si) in the peak aged (T6 state). The implications for categorizations of Al alloys are discussed and future directions of interest are highlighted.
{"title":"A Pronounced Hardening Response in Non-Heat-Treatable Al-Mg Based 5xxx Aluminum Alloys","authors":"Sun Wenwen, Yuman Zhu, R. Marceau, Lu Jiang, Lingyu Wang, X. Gao, Qi Zhang, C. Hutchinson","doi":"10.2139/ssrn.3532190","DOIUrl":"https://doi.org/10.2139/ssrn.3532190","url":null,"abstract":"The Al-Mg base 5xxx Al alloys are non-heat-treatable. They derive their strength from solid solution and strain hardening. They are, however, supersaturated and this can cause sensitization issues. This work shows that by applying a recently developed cyclic strengthening approach, a high density of Mg-Al clusters can be formed in these materials resulting yield and tensile strengths, and elongations, superior to the precipitation hardened AA6061 (Al-Mg-Si) in the peak aged (T6 state). The implications for categorizations of Al alloys are discussed and future directions of interest are highlighted.","PeriodicalId":18286,"journal":{"name":"MatSciRN: Lightweight Alloys (Topic)","volume":"01 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-12-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80093167","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}
Pub Date : 2019-07-05DOI: 10.1016/J.MTLA.2019.100439
P. K. Kanaujia, Muhammad Azkhairy bin Ramezan, Xiu Yun Yap, Yujie Song, Z. Du, C. Gan, Y. Lam, C. Lai
{"title":"Mechanical Response of Lightweight Hollow Truss Metal Oxide Lattices","authors":"P. K. Kanaujia, Muhammad Azkhairy bin Ramezan, Xiu Yun Yap, Yujie Song, Z. Du, C. Gan, Y. Lam, C. Lai","doi":"10.1016/J.MTLA.2019.100439","DOIUrl":"https://doi.org/10.1016/J.MTLA.2019.100439","url":null,"abstract":"","PeriodicalId":18286,"journal":{"name":"MatSciRN: Lightweight Alloys (Topic)","volume":"19 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81800995","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. Giwa, Z. Aitken, M. Jafary-Zadeh, P. Liaw, Yong-Wei Zhang, J. Greer
High Entropy Alloys (HEAs) represent an important class of structural materials because of their high strength, ductility, and thermal stability due to the solid solution nature of the multi-component metallic system. Understanding the mechanical response of isolated phases (FCC and BCC) of a dual-phase HEA is integral to understanding mechanical properties of these special alloys in bulk. We investigate the compressive response of single crystalline cylinders with diameters between 400 nm and 2 µm excised from individual grains within FCC and BCC phases of Al0.7CoCrFeNi HEA at 295 K, 143 K and 40 K. Micro-compression experiments were conducted in an in-situ SEM equipped with a custom-constructed cryogenic setup; FCC samples had a [324] crystallographic orientation, and those extracted from the BCC phase had a [001] orientation. We observed a "smaller is stronger" size effect in the yield strength as a function of pillar diameter, D, of both alloy phases for all temperatures, τ_y ∝D^m with a power law exponent, m, decreasing from -0.68 at 295K to -0.47 at 143K to -0.38 at 40K for FCC phase, and remaining constant at ~-0.33 for all temperatures for the BCC phase. We also observed reduced work hardening rates and more extensive strain bursts during deformation at lower temperatures in all samples. All deformed FCC samples contained multiple parallel slip offsets for all pillar sizes and temperatures; compressed BCC pillars had wavy slip traces, which are evidence of multiple intersecting slip systems. Transmission Electron Microscopy (TEM) microstructural analysis of the compressed FCC samples reveals parallel slip lines and distorted slip planes, while compressed BCC samples contained entangled dislocation networks, as well as several twinned regions in samples deformed at 40 K. Molecular dynamics (MD) simulations of representative FCC and BCC HEA compressions reveal that deformation in FCC HEAs is dominated by nucleation and propagation of partial dislocations along parallel slip planes but by partial dislocation/twinning in the BCC HEA at all temperatures. Simulations also predict a decrease in stacking fault energy with increased alloying. For example, a reduction in the stable stacking fault energy of the FCC HEA up to 55% with respect to pure constituents is observed. This reduction in stable stacking fault energy may drive the observed deformation mechanisms. We also discuss theories of low-temperature strengthening in HEAs, compare them to our experimental data and assess how they manifest in the observed temperature-dependent size effect.
{"title":"Effect of Temperature on Small-Scale Deformation of Individual FCC and BCC Phases of Al0.7CoCrFeNi High Entropy Alloy","authors":"A. Giwa, Z. Aitken, M. Jafary-Zadeh, P. Liaw, Yong-Wei Zhang, J. Greer","doi":"10.2139/ssrn.3287362","DOIUrl":"https://doi.org/10.2139/ssrn.3287362","url":null,"abstract":"High Entropy Alloys (HEAs) represent an important class of structural materials because of their high strength, ductility, and thermal stability due to the solid solution nature of the multi-component metallic system. Understanding the mechanical response of isolated phases (FCC and BCC) of a dual-phase HEA is integral to understanding mechanical properties of these special alloys in bulk. We investigate the compressive response of single crystalline cylinders with diameters between 400 nm and 2 µm excised from individual grains within FCC and BCC phases of Al0.7CoCrFeNi HEA at 295 K, 143 K and 40 K. Micro-compression experiments were conducted in an in-situ SEM equipped with a custom-constructed cryogenic setup; FCC samples had a [324] crystallographic orientation, and those extracted from the BCC phase had a [001] orientation. We observed a \"smaller is stronger\" size effect in the yield strength as a function of pillar diameter, D, of both alloy phases for all temperatures, τ_y ∝D^m with a power law exponent, m, decreasing from -0.68 at 295K to -0.47 at 143K to -0.38 at 40K for FCC phase, and remaining constant at ~-0.33 for all temperatures for the BCC phase. We also observed reduced work hardening rates and more extensive strain bursts during deformation at lower temperatures in all samples. All deformed FCC samples contained multiple parallel slip offsets for all pillar sizes and temperatures; compressed BCC pillars had wavy slip traces, which are evidence of multiple intersecting slip systems. Transmission Electron Microscopy (TEM) microstructural analysis of the compressed FCC samples reveals parallel slip lines and distorted slip planes, while compressed BCC samples contained entangled dislocation networks, as well as several twinned regions in samples deformed at 40 K. Molecular dynamics (MD) simulations of representative FCC and BCC HEA compressions reveal that deformation in FCC HEAs is dominated by nucleation and propagation of partial dislocations along parallel slip planes but by partial dislocation/twinning in the BCC HEA at all temperatures. Simulations also predict a decrease in stacking fault energy with increased alloying. For example, a reduction in the stable stacking fault energy of the FCC HEA up to 55% with respect to pure constituents is observed. This reduction in stable stacking fault energy may drive the observed deformation mechanisms. We also discuss theories of low-temperature strengthening in HEAs, compare them to our experimental data and assess how they manifest in the observed temperature-dependent size effect.","PeriodicalId":18286,"journal":{"name":"MatSciRN: Lightweight Alloys (Topic)","volume":"11 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85278696","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}
This research publication presents the method of centrifugal casting TEKCAST for the selected aluminium alloy AlSi10Mn STN 42 4383. The aim is the research and determination of hydrogen content depending on a rotation rate of mold during false centrifugal casting. Then it is an observation of the changes in mechanical and structural properties depending on the changes caused by increased content of hydrogen.
{"title":"The Determination of the Hydrogen Content in the Aluminium Alloys Casted by Tekcast Method","authors":"H. Mäsiar, Vladimír Čenger","doi":"10.2139/ssrn.3200903","DOIUrl":"https://doi.org/10.2139/ssrn.3200903","url":null,"abstract":"This research publication presents the method of centrifugal casting TEKCAST for the selected aluminium alloy AlSi10Mn STN 42 4383. The aim is the research and determination of hydrogen content depending on a rotation rate of mold during false centrifugal casting. Then it is an observation of the changes in mechanical and structural properties depending on the changes caused by increased content of hydrogen.","PeriodicalId":18286,"journal":{"name":"MatSciRN: Lightweight Alloys (Topic)","volume":"17 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-06-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73059498","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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