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Journal of Metallurgy最新文献

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Influence of Partial Replacement of Nickel by Nitrogen on Microstructure and Mechanical Properties of Austenitic Stainless Steel 氮部分取代镍对奥氏体不锈钢组织和力学性能的影响
Journal of Metallurgy Pub Date : 2011-11-16 DOI: 10.1155/2011/639283
A. Ahmed, S. Ghali, M. Eissa, S. E. Badry
{"title":"Influence of Partial Replacement of Nickel by Nitrogen on Microstructure and Mechanical Properties of Austenitic Stainless Steel","authors":"A. Ahmed, S. Ghali, M. Eissa, S. E. Badry","doi":"10.1155/2011/639283","DOIUrl":"https://doi.org/10.1155/2011/639283","url":null,"abstract":"A new modified austenitic stainless steel has been developed through partial replacement of nickel by nitrogen. Nitrogen stainless steel was produced in 10 kg induction furnace under nitrogen pressure, while reference one, AISI 316 steel grade, was produced in open-induction furnace. Both were cast and hot forged, and the total nitrogen was determined. \u0000Furthermore, the produced forged steels were subjected to solution treatment at different temperatures. The microstructure of produced stainless steels was observed. The X-ray diffractmeter and Mossbauer effect spectroscopy were used to follow the phase change in reference and modified steels after different heat treatment temperatures. The influence of grain-size, soluble, and insoluble nitrogen on tensile strength and hardness was investigated. The major phase in the modified steel has a fcc structure similar to the reference one, but with finer grains and more expanded lattice. The yield strength and hardness of the nitrogen-modified stainless steel are higher than the reference steel. On the other hand, the increase of nitrogen content deteriorates the steel ductility.","PeriodicalId":16342,"journal":{"name":"Journal of Metallurgy","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2011-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83641895","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: 10
Cohesive Relations for Surface Atoms in the Iron-Technetium Binary System 铁-锝双星系统表面原子的内聚关系
Journal of Metallurgy Pub Date : 2011-10-16 DOI: 10.1155/2011/954170
C. Taylor
{"title":"Cohesive Relations for Surface Atoms in the Iron-Technetium Binary System","authors":"C. Taylor","doi":"10.1155/2011/954170","DOIUrl":"https://doi.org/10.1155/2011/954170","url":null,"abstract":"Iron-technetium alloys are of relevance to the development of waste forms for disposition of radioactive technetium-99 obtained from spent nuclear fuel. Corrosion of candidate waste forms is a function of the local cohesive energy (Eloc) of surface atoms. A theoretical model for calculating Eloc is developed. Density functional theory was used to construct a modified embedded atom (MEAM) potential for iron-technetium. Materials properties determined for the iron-technetium system were in good agreement with the literature. To explore the relationship between local structure and corrosion, MEAM simulations were performed on representative iron-technetium alloys and intermetallics. Technetium-rich phases have lower Eloc, suggesting that these phases will be more noble than iron-rich ones. Quantitative estimates of Eloc based on numbers of nearest neighbors alone can lead to errors up to 0.5 eV. Consequently, atomistic corrosion simulations for alloy systems should utilize physics-based models that consider not only neighbor counts, but also local compositions and atomic arrangements.","PeriodicalId":16342,"journal":{"name":"Journal of Metallurgy","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2011-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82252878","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: 14
Aging Behaviour of Al-Mg-Si Alloys Subjected to Severe Plastic Deformation by ECAP and Cold Asymmetric Rolling Al-Mg-Si合金剧烈塑性变形的ECAP和冷非对称轧制时效行为
Journal of Metallurgy Pub Date : 2011-08-21 DOI: 10.1155/2011/959643
S. Faré, N. Lecis, M. Vedani
{"title":"Aging Behaviour of Al-Mg-Si Alloys Subjected to Severe Plastic Deformation by ECAP and Cold Asymmetric Rolling","authors":"S. Faré, N. Lecis, M. Vedani","doi":"10.1155/2011/959643","DOIUrl":"https://doi.org/10.1155/2011/959643","url":null,"abstract":"A study was carried out on aging behaviour of a 6082 alloy processed by two different severe plastic deformation techniques: ECAP and asymmetric rolling. Both techniques were able to generate an ultrafine-grained structure in samples processed at room temperature. It was stated that severe straining promotes marked changes in the postdeformation aging kinetics. The peaks of β′′/β′ transition phases were anticipated and of progressively reduced intensity over the coarse grained alloy. A further peak accounting for onset of recrystallization also appeared in the most severely deformed samples. Full consistency in peak shape and position was found when comparing materials processed by ECAP and asymmetric rolling. \u0000Isothermal aging treatments performed at 180°C revealed that in the severely deformed samples, aging became so fast that the hardness curves continuously decreased due to overwhelming effects of structure restoration. On the contrary, aging at 130°C offers good opportunities for fully exploiting the precipitate hardening effects in the ultrafine-grained alloy.","PeriodicalId":16342,"journal":{"name":"Journal of Metallurgy","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2011-08-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85512678","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: 39
Surface Characteristics and High Cycle Fatigue Performance of Shot Peened Magnesium Alloy ZK60 喷丸镁合金ZK60表面特性及高周疲劳性能
Journal of Metallurgy Pub Date : 2011-08-15 DOI: 10.1155/2011/682191
Jie Dong, Wencai Liu, W. Ding, J. Zou
{"title":"Surface Characteristics and High Cycle Fatigue Performance of Shot Peened Magnesium Alloy ZK60","authors":"Jie Dong, Wencai Liu, W. Ding, J. Zou","doi":"10.1155/2011/682191","DOIUrl":"https://doi.org/10.1155/2011/682191","url":null,"abstract":"The current work investigated the effect of shot peening (SP) on high cycle fatigue (HCF) behavior of the hot-extruded ZK60 magnesium alloy. SP can significantly improve the fatigue life of the ZK60 alloy. After SP at the optimum Almen intensities, the fatigue strength at 107 cycles in the as-extruded (referred to as ZK60) and the T5 aging-treated (referred to as ZK60-T5) alloys increased from 140 and 150 MPa to 180 and 195 MPa, respectively. SP led to a subsurface fatigue crack nucleation in both ZK60 and ZK60-T5 alloys. The mechanism by which the compressive residual stress induced by shot peening results in the improvement of fatigue performance for ZK60 and ZK60-T5 alloys was discussed.","PeriodicalId":16342,"journal":{"name":"Journal of Metallurgy","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2011-08-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74326179","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: 14
Transition in Deformation Mechanism of AZ31 Magnesium Alloy during High-Temperature Tensile Deformation AZ31镁合金高温拉伸变形过程中变形机制的转变
Journal of Metallurgy Pub Date : 2011-07-07 DOI: 10.1155/2011/165307
M. Noda, H. Mori, K. Funami
{"title":"Transition in Deformation Mechanism of AZ31 Magnesium Alloy during High-Temperature Tensile Deformation","authors":"M. Noda, H. Mori, K. Funami","doi":"10.1155/2011/165307","DOIUrl":"https://doi.org/10.1155/2011/165307","url":null,"abstract":"Magnesium alloys can be used for reducing the weight of various structural products, because of their high specific strength. They have attracted considerable attention as materials with a reduced environmental load, since they help to save both resources and energy. In order to use Mg alloys for manufacturing vehicles, it is important to investigate the deformation mechanism and transition point for optimizing the material and vehicle design. In this study, we investigated the transition of the deformation mechanism during the high-temperature uniaxial tensile deformation of the AZ31 Mg alloy. At a test temperature of 523 K and an initial strain rate of s−1, the AZ31 Mg alloy (mean grain size: ~5 μm) exhibited stable deformation behavior and the deformation mechanism changed to one dominated by grain boundary sliding.","PeriodicalId":16342,"journal":{"name":"Journal of Metallurgy","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2011-07-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73889397","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: 6
Surface Modification and Alloying of Aluminum and Titanium Alloys with Low-Energy, High-Current Electron Beams 低能量、大电流电子束对铝、钛合金表面的改性和合金化
Journal of Metallurgy Pub Date : 2011-06-19 DOI: 10.1155/2011/673685
V. Rotshtein, V. Shulov
{"title":"Surface Modification and Alloying of Aluminum and Titanium Alloys with Low-Energy, High-Current Electron Beams","authors":"V. Rotshtein, V. Shulov","doi":"10.1155/2011/673685","DOIUrl":"https://doi.org/10.1155/2011/673685","url":null,"abstract":"The paper reviews the results of investigations of surface modification and alloying of Al, Ti, and its alloys with a low-energy (up to ~40 keV), high-current (up to 25 J/cm2) electron beams of microsecond duration under systematically varied conditions. The microstructural evolution of the surface layers of Al alloys (Al2024 and Al6061) and Ti-6Al-4V alloy subjected to pulsed melting as well as changes in surface-sensitive properties of these alloys are considered. Phase formation and properties of Al-based and Ti-based surface alloys, synthesized by liquid-phase mixing of multilayer film-substrate systems in wide range of solid solubility, including [Al/Si]/Al, [Al/C]/Al, [Zr/Ti]/Ti-6Al-4V, and Al/Ti, are studied. In case of Ti-based substrates, this method allows to fabricate the single-phase nanocrystalline α-(TiZr) surface alloy, free of Al and V, as well as nanosized and ultrafine grain TiAl/Ti3Al-based surface alloys of thickness ≥3 μm with enhanced mechanical properties.","PeriodicalId":16342,"journal":{"name":"Journal of Metallurgy","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2011-06-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90835503","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: 27
Molecular Dynamics Simulation of the Clustering of Minor Lead Additives in Liquid Sodium 微量铅添加剂在液态钠中聚类的分子动力学模拟
Journal of Metallurgy Pub Date : 2011-06-15 DOI: 10.1155/2011/890321
A. Shimkevich, I. Shimkevich
{"title":"Molecular Dynamics Simulation of the Clustering of Minor Lead Additives in Liquid Sodium","authors":"A. Shimkevich, I. Shimkevich","doi":"10.1155/2011/890321","DOIUrl":"https://doi.org/10.1155/2011/890321","url":null,"abstract":"A strong influence of minor lead additives on the liquid sodium microstructure is revealed in the molecular dynamics (MD) simulation of the Na0.98Pb0.02 alloy. The obtained results can be explained by the existence of lead-sodium clusters in liquid sodium built up by ionic bonds, Na","PeriodicalId":16342,"journal":{"name":"Journal of Metallurgy","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2011-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84191327","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: 3
Study on the Corrosion Mechanism of Zn-5Al-0.5Mg-0.08Si Coating Zn-5Al-0.5Mg-0.08Si涂层腐蚀机理研究
Journal of Metallurgy Pub Date : 2011-06-01 DOI: 10.1155/2011/917469
Shiwei Li, B. Gao, G. Tu, Y. Hao, Liangfa Hu, Shao-hua Yin
{"title":"Study on the Corrosion Mechanism of Zn-5Al-0.5Mg-0.08Si Coating","authors":"Shiwei Li, B. Gao, G. Tu, Y. Hao, Liangfa Hu, Shao-hua Yin","doi":"10.1155/2011/917469","DOIUrl":"https://doi.org/10.1155/2011/917469","url":null,"abstract":"A new type of hot-dip Zn-5Al-0.5Mg-0.08Si and Zn-5Al alloy coatings was performed on the cold rolled common steel. The hot-dip process was executed by self-made hot-dip galvanising simulator. SEM and EDS test results demonstrated that Mg was mainly distributed in crystal boundaries. XRD test results showed that the corrosion product of Zn-5Al-0.5Mg-0.08Si alloy coating was almost Zn5(OH)8C12⋅H2O. The features of Zn5(OH)8C12⋅H2O are low electric conductivity, insolubility and good adhesion.The corrosion resistance of alloy-coated steels was detected by neutral salt spray test. The microstructural characterization of the coating surface after neutral salt spray test and removing the corrosion products revealed that the corrosion process of Zn-5Al-0.5Mg-0.08Si coating was uniform and the coating surface was almost flat. As a result, the corrosion resistance of Zn-5Al-0.5Mg-0.08Si coating has a remarkable improvement with a factor of 9.2 compared with that of Zn-5Al coating.","PeriodicalId":16342,"journal":{"name":"Journal of Metallurgy","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2011-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75000109","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: 9
Martensitic Twinning in Alpha α中的马氏体孪生
Journal of Metallurgy Pub Date : 2011-06-01 DOI: 10.1155/2011/924032
Changfu Li, Geping Li, Yi Yang, Mesut Varlioglu, Ke Yang
{"title":"Martensitic Twinning in Alpha","authors":"Changfu Li, Geping Li, Yi Yang, Mesut Varlioglu, Ke Yang","doi":"10.1155/2011/924032","DOIUrl":"https://doi.org/10.1155/2011/924032","url":null,"abstract":"The twinning structure of the orthorhombic 𝛼   martensite phase in alpha + beta Ti-3.5Al-4.5Mo (wt%) titanium alloy was studied using X-ray diffraction and transmission electron microscopy by water quenching from below transus temperatures. While water quenching from 910 ∘ C induced the formation of { 1 1 0 } ∘ twins, quenching from 840 ∘ C formed the 𝛼   martensite with { 1 1 1 } ∘ type I twins. The effect of the principle strains on the twinning structure was discussed. As compared to the previous studies, the principle strains play an important role in the formation of the twinning type.","PeriodicalId":16342,"journal":{"name":"Journal of Metallurgy","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2011-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81084571","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: 14
Biomedical Applications of Shape Memory Alloys 形状记忆合金的生物医学应用
Journal of Metallurgy Pub Date : 2011-05-23 DOI: 10.1155/2011/501483
L. Petrini, F. Migliavacca
{"title":"Biomedical Applications of Shape Memory Alloys","authors":"L. Petrini, F. Migliavacca","doi":"10.1155/2011/501483","DOIUrl":"https://doi.org/10.1155/2011/501483","url":null,"abstract":"Shape memory alloys, and in particular NiTi alloys, are characterized by two unique behaviors, thermally or mechanically activated: the shape memory effect and pseudo-elastic effect. These behaviors, due to the peculiar crystallographic structure of the alloys, assure the recovery of the original shape even after large deformations and the maintenance of a constant applied force in correspondence of significant displacements. These properties, joined with good corrosion and bending resistance, biological and magnetic resonance compatibility, explain the large diffusion, in the last 20 years, of SMA in the production of biomedical devices, in particular for mini-invasive techniques. In this paper a detailed review of the main applications of NiTi alloys in dental, orthopedics, vascular, neurological, and surgical fields is presented. In particular for each device the main characteristics and the advantages of using SMA are discussed. Moreover, the paper underlines the opportunities and the room for new ideas able to enlarge the range of SMA applications. However, it is fundamental to remember that the complexity of the material and application requires a strict collaboration between clinicians, engineers, physicists and chemists for defining accurately the problem, finding the best solution in terms of device design and accordingly optimizing the NiTi alloy properties.","PeriodicalId":16342,"journal":{"name":"Journal of Metallurgy","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2011-05-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88098478","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: 427
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