Mechanical Properties & Deformation of Materials eJournal最新文献_第3页

The Onset of Slip Activity in Relation to the Degree of Micro-Texture in Ti-6Al-4V Ti-6Al-4V中滑移活动的发生与显微织构程度的关系

Mechanical Properties & Deformation of Materials eJournal Pub Date : 2019-06-28 DOI: 10.2139/ssrn.3411753

S. Hémery, A. Naït-Ali, M. Gueguen, J. Wendorf, A. Polonsky, M. Echlin, J. Stinville, T. Pollock, P. Villechaise

{"title":"The Onset of Slip Activity in Relation to the Degree of Micro-Texture in Ti-6Al-4V","authors":"S. Hémery, A. Naït-Ali, M. Gueguen, J. Wendorf, A. Polonsky, M. Echlin, J. Stinville, T. Pollock, P. Villechaise","doi":"10.2139/ssrn.3411753","DOIUrl":"https://doi.org/10.2139/ssrn.3411753","url":null,"abstract":"The mechanical properties of titanium alloys result from their complex multi-scale microstructural features such as micron scale precipitates and millimeter scale microtextured regions (MTRs). Deformation processes that operate at the scale of the α grain are of critical importance to mechanical properties, especially to fatigue performance. However, previous investigations also highlighted that the mm-scale MTRs affect the mechanical properties of titanium alloys. Specifically, MTRs promote long-range strain localization due to the low intergranular misorientation within a MTR. Furthermore, the elastic anisotropy of the alpha phase and the non-random spatial distribution of crystallographic orientations within the MTRs produce complex mechanical effects. The present work is a mechanistic investigation of MTRs using crystal plasticity simulations of mm3-scale experimentally captured and synthetically generated 3D microstructure datasets. The explicit modeling of both the α grains and MTRs in a titanium alloy is used to determine the effect of the degree of microtexture on the deformation behavior and on the onset of plastic slip. The presence of MTRs with a dominant [0001] orientation results in both stress and plastic strain hotspots during the early stages of straining. The influence of MTRs on the local stress and strain fields are analyzed and discussed with regard to the monotonic tension, fatigue and dwell-fatigue behavior of titanium alloys.","PeriodicalId":180833,"journal":{"name":"Mechanical Properties & Deformation of Materials eJournal","volume":"45 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134394846","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 Electric Field on Uniaxial Viscosity and Sintering Stress of Ceria 电场对二氧化铈单轴粘度和烧结应力的影响

Mechanical Properties & Deformation of Materials eJournal Pub Date : 2019-06-09 DOI: 10.2139/ssrn.3401358

R. Mücke, O. Guillon, Chen Cao

{"title":"Effect of Electric Field on Uniaxial Viscosity and Sintering Stress of Ceria","authors":"R. Mücke, O. Guillon, Chen Cao","doi":"10.2139/ssrn.3401358","DOIUrl":"https://doi.org/10.2139/ssrn.3401358","url":null,"abstract":"The production of traditional and advanced ceramics is an energy-intensive activity, which requires high temperatures and longer dwelling times to activate diffusional processes necessary for densification. Electric field assisted processing has received considerable attention recently, due to its potential to significantly reduce the costs of required heat treatments. However, the effect of electric fields on the densification and coarsening of oxide ceramics still not completely understood, and the mechanisms behind, in particular for fields, are still under debate. The potential influence of electric field on the sintering parameters (uniaxial viscosity and uniaxial sintering stress) and microstructure of polycrystalline yttria doped ceria were studied. Sintering parameters were measured without and with AC electric fields (14 V/cm and 28 V/cm, 50 Hz) which were below the \"flash regime.\" During all sintering measurements, the sample temperature was adjusted by lowering the furnace temperature according to the temperature measurements using densified samples. Major findings are: (i) The densification behavior is clearly modified by these moderate electric fields, although temperature increase due to macroscopic Joule heating is excluded. (ii) The densification rate remains proportional to the applied stress under electrical fields. (iii) Sintering parameters are significantly affected by the applied electric fields.","PeriodicalId":180833,"journal":{"name":"Mechanical Properties & Deformation of Materials eJournal","volume":"57 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125951213","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

Tuning the Optical and Mechanical Properties of Y2O3 Ceramics by the Inclusion of La3+ Ion in the Matrix for Infrared Transparent Window Applications 用La3+离子修饰Y2O3陶瓷在红外透明窗口中的光学和力学性能

Mechanical Properties & Deformation of Materials eJournal Pub Date : 2019-03-31 DOI: 10.34218/IJARET.10.2.2019.001

Mathew C.T

{"title":"Tuning the Optical and Mechanical Properties of Y2O3 Ceramics by the Inclusion of La3+ Ion in the Matrix for Infrared Transparent Window Applications","authors":"Mathew C.T","doi":"10.34218/IJARET.10.2.2019.001","DOIUrl":"https://doi.org/10.34218/IJARET.10.2.2019.001","url":null,"abstract":"Infrared transparent windows are generally used to protect highly delicate infrared sensor circuits from the harsh environments. In the present work a combustion technique was effectively used to incorporate La3+ ion in the yttria matrix. The crystallites were in the size limit of 20 nm. Powder characterization using X-ray diffraction, HRTEM and FTIR spectroscopy revealed that the La3+ ions were effectively replacing the Y3+ ion in the yttria matrix. There was a slight reduction in optical band gap with La3+ concentration. A novel sintering mechanism was used for sintering the samples by coupling definite proportions of resistive heating and microwave heating. The highly dense pellets showed better transmittance and hardness properties, which improved with La3+concentration. The present study authorises that combustion synthesis of the samples followed by resistive coupled microwave sintering can effectively be used to tune the optical and mechanical, properties of infrared transparent ceramics. Improving the transmittance properties without deteriorating the mechanical properties through the resistive coupled microwave sintering is the major highlight of this novel work.","PeriodicalId":180833,"journal":{"name":"Mechanical Properties & Deformation of Materials eJournal","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115466005","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

Strength Characteristics of Alccofine Based Light Weight Concrete 乙醇基轻质混凝土的强度特性

Mechanical Properties & Deformation of Materials eJournal Pub Date : 2019-02-28 DOI: 10.34218/ijaret.10.1.2019.027

L. Sanjeev Kumar, P. Bhuvaneshwari, M. Eswar, K. Subramanian

引用次数: 3

Synchrotron Tomographic Measurement of Strain in Soft Tissue: Native Intervertebral Disc Deformation at Histological Resolution 软组织应变的同步加速器层析测量:组织学分辨率下的椎间盘原生变形

Mechanical Properties & Deformation of Materials eJournal Pub Date : 2019-02-02 DOI: 10.2139/ssrn.3326754

C. Disney, A. Eckersley, J. C. Mcconnell, H. Geng, A. Bodey, J. Hoyland, P. D. Lee, M. Sherratt, B. Bay

{"title":"Synchrotron Tomographic Measurement of Strain in Soft Tissue: Native Intervertebral Disc Deformation at Histological Resolution","authors":"C. Disney, A. Eckersley, J. C. Mcconnell, H. Geng, A. Bodey, J. Hoyland, P. D. Lee, M. Sherratt, B. Bay","doi":"10.2139/ssrn.3326754","DOIUrl":"https://doi.org/10.2139/ssrn.3326754","url":null,"abstract":"The intervertebral disc (IVD) has a complex and multiscale extracellular matrix structure which provides unique mechanical properties to withstand physiological loading. Low back pain has been linked to degeneration of the disc but reparative treatments are not currently available. Characterising the disc’s 3D microstructure and its response in a physiologically relevant loading environment is required to improve understanding of degeneration and to develop new reparative treatments. In this study, techniques for imaging the native IVD, measuring internal deformation and mapping volumetric strain were applied to a compressed spine segment. Synchrotron X-ray micro-tomography (sCT) was used to resolve IVD structures at histological resolution. These image data enabled 3D quantification of collagen bundle orientation and measurement of local displacement in the annulus fibrosus between sequential scans using digital volume correlation (DVC). The volumetric strain mapped from sCT provided a detailed insight into the micromechanics of native IVD tissue. The DVC findings showed that there was no slipping at lamella boundaries, and local strain patterns were of a similar distribution to the previously reported elastic network with some heterogeneous areas and maximum strain direction aligned with bundle orientation, suggesting bundle stretching and sliding. This method has the potential to bridge the gap between measures of macro-mechanical properties and the local 3D micro-mechanical environment experienced by cells. This is the first evaluation of strain at the micro scale level in the intact IVD and provides a quantitative framework for future IVD degeneration mechanics studies and testing of tissue engineered IVD replacements.","PeriodicalId":180833,"journal":{"name":"Mechanical Properties & Deformation of Materials eJournal","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-02-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128923149","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

Tuning Correlative Heterogeneity and Related Properties in Ni-Nb-Tm (Tm=Zr, Y, Gd) Metallic Glasses Ni-Nb-Tm (Tm=Zr, Y, Gd)金属玻璃的调谐相关非均质性及相关性能

Mechanical Properties & Deformation of Materials eJournal Pub Date : 2019-01-14 DOI: 10.2139/ssrn.3315657

T. G. Park, S. Y. Kim, H. Ahn, H. Oh, H. J. Chang, E. Park

{"title":"Tuning Correlative Heterogeneity and Related Properties in Ni-Nb-Tm (Tm=Zr, Y, Gd) Metallic Glasses","authors":"T. G. Park, S. Y. Kim, H. Ahn, H. Oh, H. J. Chang, E. Park","doi":"10.2139/ssrn.3315657","DOIUrl":"https://doi.org/10.2139/ssrn.3315657","url":null,"abstract":"Herein, we systematically investigated how to tailor correlative heterogeneity and related properties in Ni-Nb-(Zr, Y, Gd) metallic glasses (MGs). The Ni60Nb40-xZrx MGs (x=0-20 at.%) with Nb-Zr atomic pair (〖∆H〗mix=+4 kJ/mol) exhibited correlative atomic scale chemical and topological heterogeneities upon Zr addition, which can be evaluated by EXAFS analysis. Interestingly, a statistical analysis of strain burst sizes along with in situ bending test showed that the easier nucleation of chaotic shear bands is promoted with the aid of stress localization induced by the heterogeneities. The bulk specimens (d=1 mm) for 8 and 10 at.% of Zr with increased glass-forming ability (GFA) exhibited enhanced plasticity without the reduction of fracture strength, implying cooling rate effect on heterogeneity-induced plasticity. Contrastively, the Ni60Nb40-y(Y, Gd)y MGs with Nb-Y or Nb-Gd atomic pair (〖∆H〗mix=+30 kJ/mol) showed hierarchically correlative nanoscale phase separated microstructures, which can be carefully interpreted by construction of metastable miscibility gap. The microstructures rely on four different variables (the composition, the symmetry of a miscibility gap, the critical temperature and the GFA of each phase) and provide a weak interface resulting in extreme brittleness as well as drastically decreased GFA. We believe that the results of this study would provide an effective guideline for tuning correlative heterogeneity and related properties in MGs via manipulation of enthalpy relationship and cooling rate.","PeriodicalId":180833,"journal":{"name":"Mechanical Properties & Deformation of Materials eJournal","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-01-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131749979","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

Deformation-Driven Bidirectional Transformation Promotes Bulk Nanostructure Formation in a Metastable Interstitial High Entropy Alloy 变形驱动的双向相变促进了亚稳间隙高熵合金体纳米结构的形成

Mechanical Properties & Deformation of Materials eJournal Pub Date : 2019-01-10 DOI: 10.2139/ssrn.3313256

J. Su, Xiaoxiang Wu, D. Raabe, Zhiming Li

{"title":"Deformation-Driven Bidirectional Transformation Promotes Bulk Nanostructure Formation in a Metastable Interstitial High Entropy Alloy","authors":"J. Su, Xiaoxiang Wu, D. Raabe, Zhiming Li","doi":"10.2139/ssrn.3313256","DOIUrl":"https://doi.org/10.2139/ssrn.3313256","url":null,"abstract":"Abstract We investigate the mechanisms of deformation-driven forward and reverse (bidirectional) martensitic transformation and the associated nanostructure formation in a metastable carbon-doped high entropy alloy (HEA) upon cold rolling. At thickness reductions below 14%, forward hexagonal-close packed (HCP) martensitic transformation prevails in the single face-centered cubic (FCC) matrix. Surprisingly, at the intersections of two crossing HCP lamellae, deformation-induced reverse transformation from the HCP martensite back to the FCC phase occurs. At higher thickness reductions around 26%–34%, multiple deformation kink bands develop, mainly on the pyramidal habit planes of the HCP martensite, among which reverted FCC phase is also observed resulting in a dual-phase nano-laminated structure. The deformation-induced reverted FCC phase regions exhibit a twin stacking sequence relative to the prior FCC matrix, which is related to the underlying dislocation reactions and rearrangement of the partial dislocations. At 67% thickness reduction, the deformation bands develop further into micro-shear bands consisting of nanosized (sub)grains. For rendering the dual-phase nanostructure back to single-phase FCC, 400 °C/10 min tempering is applied on a 34% cold-rolled specimen. The resulting nanostructure is characterized by nano-(sub)grains and nano-twins. It exhibits an excellent strength-ductility synergy (ultimate tensile strength 1.05 GPa at 35% total elongation) due to the improved work hardening enabled by both, FCC-HCP martensitic transformation in confined regions and mechanical twinning. With this, we show that bulk nanostructured alloys with bidirectional transformation can be designed by tuning the materials’ phase stability to their thermodynamic limits with the aim to trigger sequential athermal forward and reverse transformation under load.","PeriodicalId":180833,"journal":{"name":"Mechanical Properties & Deformation of Materials eJournal","volume":"205 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-01-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124608028","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: 72

Hydrostatic Pressure Effect on Metallic Glasses: Finite Deformation Theory 金属玻璃的静水压力效应:有限变形理论

Mechanical Properties & Deformation of Materials eJournal Pub Date : 2018-12-10 DOI: 10.2139/ssrn.3298922

Zhukun Zhou, Hao Wang, Mo Li

{"title":"Hydrostatic Pressure Effect on Metallic Glasses: Finite Deformation Theory","authors":"Zhukun Zhou, Hao Wang, Mo Li","doi":"10.2139/ssrn.3298922","DOIUrl":"https://doi.org/10.2139/ssrn.3298922","url":null,"abstract":"Metallic glass does not have well-defined atomic planes and the related dislocation motion during plastic deformation. The atomic displacement during deformation instead contains a large degree of randomness, which necessarily leads to volume change. However, how the volume change contributes to the mechanisms of mechanical deformation, especially the pressure sensitivity of yielding and fracture strength remains unclear. Although volume dilatation has been observed in various mechanical deformation, experimental investigation so far shows negligible pressure effect on yield and fracture strength. Here using finite deformation theory, we give a theoretical analysis of the pressure effect on metallic glasses subject to pure shear in the presence of a large range of applied hydrostatic pressure. We found that shear deformation does couple to applied pressure as manifested through the dependence of shear strength on applied hydrostatic pressure. We argue that the strong tendency of deformation localization and the omnipresent sample imperfections unique for amorphous solids may cause the discrepancy between the theoretical and experimental results.","PeriodicalId":180833,"journal":{"name":"Mechanical Properties & Deformation of Materials eJournal","volume":"43 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-12-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117250680","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

Crystal Plasticity Assessment to Crystallographic Stage I Cracking in a Ni-Based Single Crystal Superalloy 镍基单晶高温合金晶相ⅰ阶段裂纹的晶体塑性评价

Mechanical Properties & Deformation of Materials eJournal Pub Date : 2018-10-30 DOI: 10.2139/ssrn.3275453

M. Sakaguchi, Ryota Komamura, Mana Higaki, Xiaosheng Chen, H. Inoue

{"title":"Crystal Plasticity Assessment to Crystallographic Stage I Cracking in a Ni-Based Single Crystal Superalloy","authors":"M. Sakaguchi, Ryota Komamura, Mana Higaki, Xiaosheng Chen, H. Inoue","doi":"10.2139/ssrn.3275453","DOIUrl":"https://doi.org/10.2139/ssrn.3275453","url":null,"abstract":"Stage I fatigue crack propagation along crystallographic slip planes was experimentally and analytically investigated in a single crystal Ni-base superalloy, NKH-304. Fatigue crack propagation tests at room temperature were conducted using four types C(T) specimens with different combinations of primary and secondary orientations. It was revealed in the experiments that the fatigue cracks propagated along crystallographic slip plane in mixed mode with Mode I, II and III components. Mixture ratio and fatigue crack propagation rate was strongly influenced by the primary and secondary crystal orientations. In order to interpret the effect of crystal orientations on the Stage I cracking, a crystal plasticity finite element analysis was conducted considering the actual geometry of the crystallographic crack planes. Analytical results for slip activities on the individual octahedral slip systems and a damage parameter based on the critical plane approach provided reasonable explanations to the effect of crystal orientations on the cracking path and propagation rate of the crystallographic Stage I cracking.","PeriodicalId":180833,"journal":{"name":"Mechanical Properties & Deformation of Materials eJournal","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121832224","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

Parametric Effects of Carburization Time and Temperature on the Mechanical Properties of Carburized Mild Steel 渗碳时间和渗碳温度对渗碳低碳钢力学性能的参数影响

Mechanical Properties & Deformation of Materials eJournal Pub Date : 2018-07-07 DOI: 10.2139/ssrn.3209937

K. Madu, A. E. Uyaelumuo

{"title":"Parametric Effects of Carburization Time and Temperature on the Mechanical Properties of Carburized Mild Steel","authors":"K. Madu, A. E. Uyaelumuo","doi":"10.2139/ssrn.3209937","DOIUrl":"https://doi.org/10.2139/ssrn.3209937","url":null,"abstract":"The study of process parameters in metals during heat treatment has been of considerable interest for some years but there has been relatively little work on process variables during the surface hardening process since controlling parameters in carburization is a complex problem. This work focuses on the parametric effects of the carburizing temperature and time on the mechanical properties of mild steel carburized with activated carbon, at 850, 900 and 950 °C, soaked at the carburizing temperature for 15 and 30 minutes, quenched in oil, tempered at 550 °C and held for 60 minutes. Sequel to carburization process, standard test samples were prepared from the as received specimen for tensile and impact tests. After carburization process, the test samples were subjected to the standard test and from the data obtained, ultimate tensile strength, engineering strain, impact strength, Youngs’ moduli were calculated. The case and core hardness of the carburized tempered samples were measured. Observation shows that the mechanical properties of mild steels were found to be strongly influenced by the process of carburization, carburizing temperature and soaking time at carburizing temperature. It was concluded that the optimum combination of mechanical properties is obtained at the carburizing temperature of 900°C followed by oil quenching and tempering at 550 °C.","PeriodicalId":180833,"journal":{"name":"Mechanical Properties & Deformation of Materials eJournal","volume":"78 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-07-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116145666","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