AMI: Acta Materialia最新文献_第5页

Mechanical Performance and Durability of Banana Fibre and Coconut Coir Reinforced Cement Stabilized Earth Blocks 香蕉纤维和椰椰纤维增强水泥稳定土块的力学性能和耐久性

AMI: Acta Materialia Pub Date : 2021-01-01 DOI: 10.2139/ssrn.3891469

Kirupairaja Thanushan, N. Sathiparan

{"title":"Mechanical Performance and Durability of Banana Fibre and Coconut Coir Reinforced Cement Stabilized Earth Blocks","authors":"Kirupairaja Thanushan, N. Sathiparan","doi":"10.2139/ssrn.3891469","DOIUrl":"https://doi.org/10.2139/ssrn.3891469","url":null,"abstract":"Agricultural waste disposal is among the environmental problem in many countries. Finding economical uses for this waste by incorporating it in a product is the approach often used to overcome the environmental issue. Banana fibre and coconut coir are major agricultural waste products in Sri Lanka and fewer amounts of these are converted into usable products. Manufacturing cement-stabilized earth blocks incorporating these waste materials can reduce the environmental impact. The present study focuses on the post-peak behavior and durability of banana fibre and coconut coir-strengthened cement-stabilized earth blocks. Banana fibre and coconut coir reinforced cement-stabilized earth blocks are tested for compression, flexural bending, water absorption, sorptivity and resistance against chemicals, wet-dry weathering and freeze-thaw weathering. The banana fibre is shown better post-peak behavior in compression and coconut coir shown better post-peak behavior in flexural. Both fibre reinforcements improved the block’s durability against the acid attack, alkaline attack, wet-dry weathering and freeze-thaw weathering. Moreover, the specimen reinforced with coconut coir was found to exhibit better durability compared to the specimen reinforced with banana fibres.","PeriodicalId":7755,"journal":{"name":"AMI: Acta Materialia","volume":"74 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83999430","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

Deformation of Aluminum in Situ Sem and Full Field Measurements by Digital Image Correlation: Evidence of Concomitant Crystal Slip and Grain Boundary Sliding 铝的原位扫描电镜变形和数字图像相关的全场测量:伴随晶体滑移和晶界滑动的证据

AMI: Acta Materialia Pub Date : 2021-01-01 DOI: 10.2139/ssrn.3922862

A. Dimanov, A. El Sabbagh, J. Raphanel, T. Le, M. Bornert, S. Hallais, A. Tanguy

{"title":"Deformation of Aluminum in Situ Sem and Full Field Measurements by Digital Image Correlation: Evidence of Concomitant Crystal Slip and Grain Boundary Sliding","authors":"A. Dimanov, A. El Sabbagh, J. Raphanel, T. Le, M. Bornert, S. Hallais, A. Tanguy","doi":"10.2139/ssrn.3922862","DOIUrl":"https://doi.org/10.2139/ssrn.3922862","url":null,"abstract":"Mechanical testing in situ scanning electron microscopy (SEM) has become a current technique for multiscale micromechanical investigation of polycrystalline materials, because direct observation of deformation microstructures allows identification of strain heterogeneities and related mechanisms. Yet, most of the studies are based on the inherited post mortem microstructures, thus precluding to unravel the local loading history, to understand the development of localization patterns, the potential interactions of concomitant mechanisms and to quantify their respective contributions to the overall strain. We therefore developed a novel experimental setup for thermomechanical testing in situ SEM, especially suited for full strain field measurements based on digital image correlation (DIC) from the sample scale, to the scales of the aggregate and the single grain. We present results obtained during simple compression, at controlled displacement rate and at temperatures up to 400°C, for polycrystalline aluminum presenting randomly oriented coarse grains (ca. 300 μm in size). According to the different scales of interest, specific surface marking patterns were realized by electron microlithography. Kinematic analysis by digital image correlation (DIC) allowed to retrieve full surface strain fields. The latter evidenced that the overall viscoplastic response was dominated by crystal slip plasticity. Increasing temperature favored the activation of non-octahedral slip, but also substantial and continuous contribution of grain boundary sliding (GBS). We suggest the latter mechanism as necessary to accommodate local plastic incompatibilities between neighboring grains.","PeriodicalId":7755,"journal":{"name":"AMI: Acta Materialia","volume":"41 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85112375","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

Measuring Radiation Enhanced Diffusion Through in situ Ion Radiation Induced Sintering of Oxide Nanoparticles 通过原位离子辐射诱导烧结氧化纳米颗粒测量辐射增强扩散

AMI: Acta Materialia Pub Date : 2021-01-01 DOI: 10.2139/ssrn.3951050

N. Madden, S. Briggs, Diana Perales, T. Boyle, K. Hattar, J. Krogstad

{"title":"Measuring Radiation Enhanced Diffusion Through in situ Ion Radiation Induced Sintering of Oxide Nanoparticles","authors":"N. Madden, S. Briggs, Diana Perales, T. Boyle, K. Hattar, J. Krogstad","doi":"10.2139/ssrn.3951050","DOIUrl":"https://doi.org/10.2139/ssrn.3951050","url":null,"abstract":"Radiation enhanced diffusion often contributes significantly to the evolution of microstructures subject to radiation but can be challenging to predict in complex nonmetallic material systems. Here, microstructural evolution in the presence of ion radiation was leveraged to explore the underlying transport phenomenon. Specifically, in situ ion irradiation of nanoparticles reveal rapid densification at room temperature for nanoparticles of cerium oxide (CeO2) and yttria stabilized zirconia (YSZ) but not for magnesium oxide (MgO) or silicon carbide (SiC). This is attributed to rapid diffusion of radiation induced interstitial defects to the high density of free surfaces in the nanoparticle agglomerates. When these observations are combined with image processing and application of a simple two-sphere sintering model, radiation enhanced diffusivity values can be calculated. In situ irradiation of YSZ nanoparticles over a broader temperature range, 50 K to 1073 K, clearly revealed a transition between three distinct rate limiting regimes: (i) low temperature, sink-limited kinetics, (ii) intermediate temperature, recombination-limited kinetics, and (iii) at high-temperature the densification is consistent with thermally activated diffusion kinetics. The high spatial and temporal resolution provided by the in situ methodology is critical to confidently distinguishing these regimes in nonmetallic oxides. While only four nonmetallic nanoparticle systems are presented here (YSZ, CeO2, SiC, and MgO), application of this methodology to the readily accessible, diverse catalog of nanoparticle chemistries and morphologies will allow for rapid exploration of radiation-enhanced diffusion behavior in a broader range of complex nonmetallic systems without the need for tracers.","PeriodicalId":7755,"journal":{"name":"AMI: Acta Materialia","volume":"47 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79451513","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

The Role of Β-Zr in Zr-2.5nb Alloys During Aqueous Corrosion: A Multi-Technique Study Β-Zr在Zr-2.5nb合金水溶液腐蚀中的作用:多技术研究

AMI: Acta Materialia Pub Date : 2021-01-01 DOI: 10.2139/ssrn.3779737

Junliang Liu, G. He, A. Callow, Kexue Li, K. Moore, H. Nordin, Michael Moody, S. Lozano-Perez, C. Grovenor

{"title":"The Role of Β-Zr in Zr-2.5nb Alloys During Aqueous Corrosion: A Multi-Technique Study","authors":"Junliang Liu, G. He, A. Callow, Kexue Li, K. Moore, H. Nordin, Michael Moody, S. Lozano-Perez, C. Grovenor","doi":"10.2139/ssrn.3779737","DOIUrl":"https://doi.org/10.2139/ssrn.3779737","url":null,"abstract":"Zr–2.5Nb alloy are used as pressure tubes in Canadian Deuterium Uranium (CANDU) nuclear reactors, and the typical starting microstructure consists of α-Zr grains elongated in both transverse and longitudinal directions and thin layers of partly decomposed β-Zr lying between the α-Zr grains. In this study, we have used state-of-the-art microscopy techniques to characterise the long-term thermally decomposed β phase in these alloys, and the oxide scale formed on them in a reactor coolant loop with the aim of understanding the mechanisms underpinning the thermal decomposition behaviour at service temperatures and exploring the role of the decomposed β-Zr phase in controlling the microstructure and microchemistry of the zirconium oxide, and hence its influence on the general corrosion resistance of the alloy. We observe that these β-Zr layers are heavily decomposed even after the short stress stage at 400°C at the end of the manufacturing cycle, with a closely packed array of β-Nb precipitates forming in an α-Zr matrix. We have shown that the oxidation of these bands is significantly slower than the surrounding α-Zr matrix and that zirconium oxide grains are re-nucleated under each band. We conclude that it is the combination of the Nb-rich remnants of the original β-Zr layers arising from the hot extrusion and drawing stages and this new dense oxide that offers a significant barrier to the oxidation front (and also to the penetration of hydrogenic species), so the characteristic layered microstructure arising from the original manufacturing process is very important in determining the overall oxidation behaviour.","PeriodicalId":7755,"journal":{"name":"AMI: Acta Materialia","volume":"34 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88390470","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

Nanoporous Carbon From Mulberry Leaves Residues via Microwave Assisted Hydrothermal-Carbonization for Methyl Orange Adsorption: Kinetic, Equilibrium and Thermodynamic Studies 微波辅助水热碳化桑叶残基纳米孔碳吸附甲基橙:动力学、平衡和热力学研究

AMI: Acta Materialia Pub Date : 2021-01-01 DOI: 10.2139/ssrn.3906849

Siwat Siraoranroj, N. Kaewtrakulchai, M. Fuji, A. Eiad-ua

{"title":"Nanoporous Carbon From Mulberry Leaves Residues via Microwave Assisted Hydrothermal-Carbonization for Methyl Orange Adsorption: Kinetic, Equilibrium and Thermodynamic Studies","authors":"Siwat Siraoranroj, N. Kaewtrakulchai, M. Fuji, A. Eiad-ua","doi":"10.2139/ssrn.3906849","DOIUrl":"https://doi.org/10.2139/ssrn.3906849","url":null,"abstract":"High performance nanoporous carbons (MLC) were directly prepared from mulberry leaves (Morus alba L.) residues by the hydrothermal-carbonization with chemical reagent combined the microwave-assisted treatment. The as-purified MLC was successfully applied for the adsorption of methyl orange, which is one of crucial waste-water pollutants left from an industrial sector. The MLC sample obtained from the hydrothermal process (200 °C, 12 h) using an activation of 15 wt% NaOH (700 °C, 2 h), and combined with microwave treatment at 700 W for 6 min, specifically exhibited micropores and mesopores in the MLC morphological structure. Accordingly, the highest SBET was approximately 791.79 m2/g with the total pore volume of 0.495 cm3/g. Moreover, the adsorption performance test of MLC was conducted by the shaking unit using 100 ppm methyl orange concentration. The MLC showed the highest methyl orange-adsorption uptake of 99% at 30 °C under an ambient pressure (1 atm). The development of mulberry leaves (Morus alba L.) residues into MLC exhibited a great attention for dyes adsorption with a rapid adsorption kinetic, and excellent adsorption capacity, which are a promising-characteristics for practical waste-water adsorption experiments.","PeriodicalId":7755,"journal":{"name":"AMI: Acta Materialia","volume":"70 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90655643","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

Study of Microbands in a Fe-30mn-6.5al-0.3c Low-Density Steel Deformed at Cryogenic Temperature Fe-30mn-6.5al-0.3c低温变形低密度钢的微带研究

AMI: Acta Materialia Pub Date : 2021-01-01 DOI: 10.2139/ssrn.3947689

I. Gutierrez-Urrutia, A. Shibata, K. Tsuzaki

{"title":"Study of Microbands in a Fe-30mn-6.5al-0.3c Low-Density Steel Deformed at Cryogenic Temperature","authors":"I. Gutierrez-Urrutia, A. Shibata, K. Tsuzaki","doi":"10.2139/ssrn.3947689","DOIUrl":"https://doi.org/10.2139/ssrn.3947689","url":null,"abstract":"The microband (MB) formation mechanisms in an austenitic Fe-30Mn-6.5Al-0.3C (wt.%) low-density steel tensile deformed at -196°C were investigated by combined electron channeling contrast imaging (ECCI) and electron backscatter diffraction (EBSD). The grain orientation dependences of the MB structure, MB morphology, and MB alignment were quantitatively evaluated in grains oriented with the two main texture components, namely, <111>//tensile axis (TA) and <001>//TA. The interplay between the deformation structure and MB formation was analyzed. Our analysis indicates that the underlying deformation structure controls the MB formation mechanism and, at the current deformation conditions, also determines the crystallographic character of MBs. Most of the evaluated MBs have a crystallographic character (deviation angle <5° from {111} slip plane traces). Specifically, 77% of the MBs in the grains oriented close to <111>//TA directions and all the MBs evaluated in grains oriented close to <001>//TA directions have a crystallographic character. They are associated with a planar strain localization phenomenon occurring along highly-stressed crystallographic slip planes. Non-crystallographic MBs (deviation angle >5° from {111} slip plane traces) only occur in the grains oriented close to <111>//TA directions. They are associated with the splitting of pre-existing dense-dislocation walls (DDWs). At high strain levels, we foresee the activation of a GB-assisted MB formation mechanism associated with twin-GB interactions.","PeriodicalId":7755,"journal":{"name":"AMI: Acta Materialia","volume":"1012 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77174468","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

Effect of Aging State on Fatigue Property of Wrought Aluminum Alloys 时效状态对变形铝合金疲劳性能的影响

AMI: Acta Materialia Pub Date : 2021-01-01 DOI: 10.2139/ssrn.3919744

B. Gong, Z.J. Zhang, Z. Qu, J. Hou, H.J. Yang, X. Shao, Z. Zhang

引用次数: 8

Low-Fatigue and Large Room-Temperature Elastocaloric Effect in a Bulk Ti 49.2Ni 40.8Cu 10 Alloy Ti 49.2Ni 40.8Cu 10块状合金的低疲劳大室温弹性热效应

AMI: Acta Materialia Pub Date : 2021-01-01 DOI: 10.2139/ssrn.3927821

Pengfei Dang, Yumei Zhou, Lei Ding, J. Pang, Lei Zhang, X. Ding, Jun Sun, T. Lookman, D. Xue

引用次数: 2

Solubility Limit and Annealing Effects on the Microstructure & Thermoelectricproperties of Fe 2V 1-XTa xAl 1-YSi y Heusler Compounds fe2v 1-XTa xAl 1-YSi y Heusler化合物的溶解度极限和退火对其微观结构和热电性能的影响

AMI: Acta Materialia Pub Date : 2021-01-01 DOI: 10.2139/ssrn.3762208

F. Garmroudi, M. Parzer, A. Riss, N. Reumann, B. Hinterleitner, K. Tobita, Y. Katsura, K. Kimura, T. Mori, E. Bauer

{"title":"Solubility Limit and Annealing Effects on the Microstructure & Thermoelectricproperties of Fe 2V 1-XTa xAl 1-YSi y Heusler Compounds","authors":"F. Garmroudi, M. Parzer, A. Riss, N. Reumann, B. Hinterleitner, K. Tobita, Y. Katsura, K. Kimura, T. Mori, E. Bauer","doi":"10.2139/ssrn.3762208","DOIUrl":"https://doi.org/10.2139/ssrn.3762208","url":null,"abstract":"Full-Heusler compounds with the composition Fe2V1-XTaxAl1-YSiy have recently shown to exhibit some of thehighest power factors reported so far for bulk materials due to the band convergence and band gap opening causedby the V/Ta substitution. Therefore, the solubility limit of Ta and Si regarding the stability of the L21 phase isinvestigated in this study. The crystal structure and microstructure of a large number of samples is probed by X-raydiffraction as well as scanning electron microscopy and energy dispersive X-ray analysis. The results show that the Al/Si substitution significantly hampers the solubility of Ta within the Heusler structure. Furthermore, Fe2V0.9Ta0.1Al and Fe2V0.95Ta0.05Al0.9Si0.1 reveal nanoscale impurity precipitates in the microstructure, together with diffuse contrasts that indicate a non-equilibrium metastable state. For that reason, different annealing conditions, varying the temperature and time, have been applied to the latter and the effect on the microstructure and thermoelectric properties is investigated. It is found that additional annealing leads to further phase segregation and grain growth of the impurity precipitates, which due to their metallic-like nature have a detrimental effect on the Seebeck coefficient. They can however effectively reduce the lattice thermal conductivity if the average grain size remains below the phonon mean free path. The thermoelectric efficiency in terms of the dimensionless gure of merit ZT is increased up to ZT = 0.3 - 0.34 at 300K which is beyond the values previously reported for Fe2VAl-based bulk materials.","PeriodicalId":7755,"journal":{"name":"AMI: Acta Materialia","volume":"103 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90309739","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

Non-Equilibrium Solidification Behavior With Solute Trapping Associated With Powder Characteristics During Electron Beam Additive Manufacturing 电子束增材制造过程中与粉末特性相关的溶质俘获非平衡凝固行为

AMI: Acta Materialia Pub Date : 2021-01-01 DOI: 10.2139/ssrn.3866407

Yufan Zhao, Huakang Bian, Hao Wang, K. Aoyagi, Yujie Cui, Y. Lei, K. Yamanaka, A. Chiba

{"title":"Non-Equilibrium Solidification Behavior With Solute Trapping Associated With Powder Characteristics During Electron Beam Additive Manufacturing","authors":"Yufan Zhao, Huakang Bian, Hao Wang, K. Aoyagi, Yujie Cui, Y. Lei, K. Yamanaka, A. Chiba","doi":"10.2139/ssrn.3866407","DOIUrl":"https://doi.org/10.2139/ssrn.3866407","url":null,"abstract":"For components built by powder bed fusion with electron beam (PBF-EB), the resulting microstructure arising from non-equilibrium solidification–microsegregation and the formation of interdendritic phases significantly affects the mechanical properties and hot cracking resistance. Notably, the powder characteristics influence heat absorption and conduction, thereby altering the molten pool behavior and solidification parameters. However, the effect of powder feedstock on non-equilibrium solidification during PBF has not been widely investigated. In this study, a CoCrMo alloy was built using powders prepared by gas-atomization (GA) and plasma rotating electrode process (PREP). Under the given operating conditions, the samples built with the two powders were experimentally characterized and their compression properties were compared. By performing multi-scale numerical simulations, powder melting and solidification were visualized and analyzed to elucidate the mechanism through which the powder characteristics influence the non-equilibrium solidification behavior during PBF-EB. The study revealed that upon appropriated size control, compared to the GA powder, the PREP powder had a smaller specific surface area and higher sphericity; thus, the generated powder layer exhibited higher heat absorption and dissipation rates. Therefore, a high solidification rate is facilitated, thereby suppressing microsegregation. The findings contribute to PBF knowledge related to feedstock, thus proving to be an essential reference for selecting and optimizing metallic powders applicable to additive manufacturing.","PeriodicalId":7755,"journal":{"name":"AMI: Acta Materialia","volume":"10 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86452706","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