MatSciRN: Other Mechanical Properties & Deformation of Materials (Topic)最新文献

Predicting Core Structure Variations and Spontaneous Partial Kink Formation for ½<111> Screw Dislocations in Three BCC NbTiZr Alloys 预测三种BCC NbTiZr合金半螺旋位错的核心结构变化和自发部分扭结形成

MatSciRN: Other Mechanical Properties & Deformation of Materials (Topic) Pub Date : 2021-07-01 DOI: 10.2139/ssrn.3708693

B. Akdim, C. Woodward, S. Rao, E. Antillon

{"title":"Predicting Core Structure Variations and Spontaneous Partial Kink Formation for ½<111> Screw Dislocations in Three BCC NbTiZr Alloys","authors":"B. Akdim, C. Woodward, S. Rao, E. Antillon","doi":"10.2139/ssrn.3708693","DOIUrl":"https://doi.org/10.2139/ssrn.3708693","url":null,"abstract":"Abstract Recent interest in chemically-complex solid-solution alloys has produced a number of new refractory BCC alloys with superior high-temperature properties. Preliminary atomistic studies show that, unlike simple BCC metals, these alloys produce equilibrium (screw) dislocations spread on varying glide planes along their length. This observation suggests that under load such defects produce kinks on different glide planes leading to a distribution of pinning points that significantly increases high-temperature strength. In order to validate this model a first-principle approach is developed to characterize these sub-nanoscale structures. We find significant spreading of the dislocation onto varying {110} planes (partial kinks) in NbTiZr and Nb17Ti33Zr50, while Nb50Ti33Zr17 produces a straight-compact dislocation as found in simple BCC metals. Chemical analysis around the dislocation indicate that the partial kinks form in response to increasing (decreasing) Ti and Zr (Nb) compositions. These results validate a growing body of work on understanding the hardening mechanisms in chemically-complex alloys.","PeriodicalId":442517,"journal":{"name":"MatSciRN: Other Mechanical Properties & Deformation of Materials (Topic)","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116582368","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: 12

Role of In-Situ Dynamic Splat Sintering on Elastic and Damping Behavior of Cold Sprayed Aluminum Coatings 原位动态裂片烧结对冷喷涂铝涂层弹性和阻尼性能的影响

MatSciRN: Other Mechanical Properties & Deformation of Materials (Topic) Pub Date : 2021-06-14 DOI: 10.2139/ssrn.3866410

Tanaji Paul, Pranjal Nautiyal, Cheng Zhang, B. Boesl, Arvind Agarwal

引用次数: 0

Effect of wire aspect ratio and crack configurations on stress intensity factor solutions of transverse cracked cylindrical fracture specimen in tension 钢丝长径比和裂纹形态对横向裂纹圆柱形试样拉伸应力强度因子解的影响

MatSciRN: Other Mechanical Properties & Deformation of Materials (Topic) Pub Date : 2021-05-25 DOI: 10.2139/ssrn.3947203

H. Sahasrabuddhe, A. Mishra, Balila Nagamani Jaya, PhD

引用次数: 0

Temperature-Dependent Cavity Swelling in Dual-Ion Irradiated Fe and Fe-Cr Ferritic Alloys 双离子辐照Fe和Fe- cr铁素体合金中温度相关的空洞膨胀

MatSciRN: Other Mechanical Properties & Deformation of Materials (Topic) Pub Date : 2021-04-01 DOI: 10.2139/ssrn.3708680

Yan-Ru Lin, A. Bhattacharya, Da Chen, J. Kai, J. Henry, S. Zinkle

{"title":"Temperature-Dependent Cavity Swelling in Dual-Ion Irradiated Fe and Fe-Cr Ferritic Alloys","authors":"Yan-Ru Lin, A. Bhattacharya, Da Chen, J. Kai, J. Henry, S. Zinkle","doi":"10.2139/ssrn.3708680","DOIUrl":"https://doi.org/10.2139/ssrn.3708680","url":null,"abstract":"Abstract Fe-Cr ferritic-martensitic (FM) steels are promising structural material candidates for fusion and advanced fission reactors due to their attractive mechanical properties and volumetric swelling resistance. However, significant discrepancies exist regarding the effect of solutes and irradiation temperature on cavity swelling under ion versus neutron irradiation conditions. In this study, simultaneous dual ion irradiations (8 MeV Ni3+ ions and energy-degraded 3.5 MeV He2+ ions) were used to quantify the cavity swelling behavior in ultra-high purity Fe and Fe-Cr alloys (3-14 wt.% Cr), Fe-10 wt.% Cr-780 wt.ppm C, and Eurofer97 FM steel. The irradiations were conducted over a wide temperature range (400-550°C) with a mid-range dose of ~30 displacements per atom (dpa) and 0.1 appm/dpa He implantation rate. Using state-of-the-art transmission electron microscopy (TEM), we reveal that pure Fe has a ~50°C lower peak swelling temperature difference than Fe-Cr alloys, which is attributed to higher vacancy mobility in pure Fe. Chromium solute appears to strongly suppress cavity swelling in Fe-Cr alloys for temperatures below ~470°C, but seems to have little effect or slightly enhances swelling above ~470°C. Cavities were observed in all the irradiated samples between 400-550°C. This indicates that the narrow temperature range of observable cavities reported in prior ion irradiated Fe-Cr ferritic alloy studies is likely an artifact associated with the use of low ion energies (","PeriodicalId":442517,"journal":{"name":"MatSciRN: Other Mechanical Properties & Deformation of Materials (Topic)","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125270148","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: 40

A Crystal Plasticity Investigation of Grain Size-Texture Interaction in Magnesium Alloys 镁合金晶粒尺寸-织构相互作用的晶体塑性研究

MatSciRN: Other Mechanical Properties & Deformation of Materials (Topic) Pub Date : 2021-02-19 DOI: 10.2139/ssrn.3726296

B. Ravaji, S. Joshi

{"title":"A Crystal Plasticity Investigation of Grain Size-Texture Interaction in Magnesium Alloys","authors":"B. Ravaji, S. Joshi","doi":"10.2139/ssrn.3726296","DOIUrl":"https://doi.org/10.2139/ssrn.3726296","url":null,"abstract":"Abstract This work investigates the microstructure-property linkages in magnesium (Mg) with an emphasis on understanding interaction effects between the grain size, texture, and loading orientation. A single crystal plasticity framework endowed with experimentally informed micro Hall-Petch type relations for the activation thresholds for slip and twinning is adopted to resolve polycrystalline microstructures over a broad texture-grain size space. The macroscopic trends from the simulations corroborate with experiments. The synergistic effects of microstructural engineering on the micromechanical characteristics are mapped, which reveal their role in the emergent macroscopic behaviors. The simulations predict reduced extension twinning with grain size refinement even though the micro Hall-Petch coefficient for twinning is smaller than that for the non-basal slip modes. While grain refinement and textural weakening generally reduce the net plastic anisotropy and tension-compression asymmetry, the degree to which these macroscopic behaviors are tempered depends on the loading orientation. The results offer a preliminary insight into the roles that texture and grain size may play in the damage behavior of engineered Mg microstructures.","PeriodicalId":442517,"journal":{"name":"MatSciRN: Other Mechanical Properties & Deformation of Materials (Topic)","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-02-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125187074","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: 17

Mechanical Instability and Tensile Properties of TiZrHfNbTa High Entropy Alloy at Cryogenic Temperatures 低温下TiZrHfNbTa高熵合金的力学不稳定性和拉伸性能

MatSciRN: Other Mechanical Properties & Deformation of Materials (Topic) Pub Date : 2020-12-01 DOI: 10.2139/ssrn.3674659

Shubin Wang, Ming. H. Wu, D. Shu, G. Zhu, Donghong Wang, Bao-de Sun

{"title":"Mechanical Instability and Tensile Properties of TiZrHfNbTa High Entropy Alloy at Cryogenic Temperatures","authors":"Shubin Wang, Ming. H. Wu, D. Shu, G. Zhu, Donghong Wang, Bao-de Sun","doi":"10.2139/ssrn.3674659","DOIUrl":"https://doi.org/10.2139/ssrn.3674659","url":null,"abstract":"Abstract The equiatomic TiZrHfNbTa alloy is one of the few refractory high entropy alloys that exhibit tensile ductility at room temperature, the deformation of which is only dominated by dislocation slip. Here, we observed the activation of {112} nano-twinning accompanied by the deformation induced body-centered cubic structure (BCC) to non-closed packed hexagonal ω phase transformation along with the dislocation slip during tensile deformation at cryogenic temperatures, which indicates the intrinsic mechanical instability of the single-phase BCC TiZrHfNbTa solid solution. The alloy maintains a high tensile elongation of 20.8% while the yield strength increases significantly up to 1,549 MPa as the temperature is decreased from 277 K to 77 K, without obvious ductile to brittle transition. This exceptional combination of high strength and high ductility at cryogenic temperatures can be interpreted by considering the synergistic effect of screw dislocation glide, {112} mechanical twinning and BCC → ω phase transformation. These results provide new insights on our understanding of the refractory TiZrHfNbTa-based alloys and extend their application to cryogenic temperatures at the extreme service conditions like aerospace, marine shipbuilding and natural gas industries, albeit they are promising for high-temperature application.","PeriodicalId":442517,"journal":{"name":"MatSciRN: Other Mechanical Properties & Deformation of Materials (Topic)","volume":"424 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132617785","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: 89

Influence of the Crystallographic Orientation of a Directionally Solidified Nickel-Based Superalloy on Macroscopic Grinding Forces 定向凝固镍基高温合金结晶取向对宏观磨削力的影响

MatSciRN: Other Mechanical Properties & Deformation of Materials (Topic) Pub Date : 2020-10-30 DOI: 10.2139/ssrn.3722049

A. Grimmert, L. Dankl, P. Wiederkehr

{"title":"Influence of the Crystallographic Orientation of a Directionally Solidified Nickel-Based Superalloy on Macroscopic Grinding Forces","authors":"A. Grimmert, L. Dankl, P. Wiederkehr","doi":"10.2139/ssrn.3722049","DOIUrl":"https://doi.org/10.2139/ssrn.3722049","url":null,"abstract":"In aerospace industry profile and surface grinding processes are key operations in the machining of turbine blades. The calculation of grinding forces depending on process parameters, e.g., depth of cut and feed rate, offers the possibility of pre-designing the process in order to reduce efforts for preliminary experimental tests and to avoid mechanically overloading the workpiece. For this purpose, a material-dependent macroscopic force model for isotropic materials was determined in a preliminary work. However, turbine blades are usually made of directionally solidified superalloys that can withstand higher temperatures than common alloys leading to a higher engine efficiency. In this paper, the effects of the anisotropic mechanical properties of these materials on grinding forces are discussed. Therefore, experimental studies on a surface grinding process were carried out using directionally solidified MAR 247 samples consisting of four different primary orientations with respect to the grinding direction. The forces were measured with a dynamometer and the results were used to decide whether the crystallographic orientation has to be implemented in a macroscopic grinding force model.","PeriodicalId":442517,"journal":{"name":"MatSciRN: Other Mechanical Properties & Deformation of Materials (Topic)","volume":"272 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115963031","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

On Short-Range Order Strengthening and its Role in High-Entropy Alloys 短程强化及其在高熵合金中的作用

MatSciRN: Other Mechanical Properties & Deformation of Materials (Topic) Pub Date : 2020-10-26 DOI: 10.2139/ssrn.3718099

C. G. Schon

引用次数: 0

Mechanisms of Simultaneously Improving the Strength and Ductility of an In-Situ Tib 2/Al-Zn-Mg-Cu Composite by Elliptical Cross-Section Torsion Extrusion 椭圆截面扭转挤压同时提高tib2 /Al-Zn-Mg-Cu复合材料强度和塑性的机理

MatSciRN: Other Mechanical Properties & Deformation of Materials (Topic) Pub Date : 2020-10-26 DOI: 10.2139/ssrn.3718096

Shilin Zhao, Hai-ming Zhang, Z. Cui, Dong Chen, Zhe Chen

{"title":"Mechanisms of Simultaneously Improving the Strength and Ductility of an In-Situ Tib 2/Al-Zn-Mg-Cu Composite by Elliptical Cross-Section Torsion Extrusion","authors":"Shilin Zhao, Hai-ming Zhang, Z. Cui, Dong Chen, Zhe Chen","doi":"10.2139/ssrn.3718096","DOIUrl":"https://doi.org/10.2139/ssrn.3718096","url":null,"abstract":"This work conducts an integrated experimental and simulation research on the multiple mechanisms of performance improvement of a metal matrix composite via a new severe plastic deformation method, i.e., elliptical cross-section torsion extrusion (E-TE). Results evidence that the E-TE efficiently homogenizes the particle distribution and refines the composite’s microstructure, thus yields a simultaneous improvement of the strength and ductility. The microstructure refinement is dominated by mechanical deformation and processing temperature and mainly attributed to the joint effect of three mechanisms: (1) fragmenting of large grains and smashing of particle bands/clusters due to extensive shear deformation of the E-TE; (2) higher driving force and more nucleation sites provided by fine precipitation and reinforced particles for dynamic recrystallization (DRX) through accelerating dislocation generation and pinning dislocation movement, as well as additional DRX by coarse particles via particle stimulated nucleation; (3) the impeding of grain growth by dispersed particles. Moreover, increasing processing temperature results in the successive coarsening and dissolution of precipitations; the precipitation dissolution deteriorates the grain refinement and weakens the strength of the particle/matrix interface. Full-field crystal plasticity simulations reveal that the strength improvement of the E-TE processed composite is mainly attributed to grain boundary strengthening, while reinforced particles sustain high stress and strengthen the matrix as well, and these contributions increase with the decrease of the matrix’s grain size. The grain refinement and particle homogenization also improve the fracture toughness and ductility of the composite by retarding the generation of damages and impeding the crack propagation.","PeriodicalId":442517,"journal":{"name":"MatSciRN: Other Mechanical Properties & Deformation of Materials (Topic)","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-10-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115286030","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

Mechanistic Origin of Ductility in Precipitation Hardening AlMgScZr Alloys 析出硬化AlMgScZr合金塑性的机理

MatSciRN: Other Mechanical Properties & Deformation of Materials (Topic) Pub Date : 2020-10-21 DOI: 10.2139/ssrn.3716040

Han Chen, Zhe Chen, G. Ji, S. Zhong, Hao Wei Wang, A. Borbély, Y. Ke, Y. Bréchet

{"title":"Mechanistic Origin of Ductility in Precipitation Hardening AlMgScZr Alloys","authors":"Han Chen, Zhe Chen, G. Ji, S. Zhong, Hao Wei Wang, A. Borbély, Y. Ke, Y. Bréchet","doi":"10.2139/ssrn.3716040","DOIUrl":"https://doi.org/10.2139/ssrn.3716040","url":null,"abstract":"Precipitation hardening is the most effective strategy to enhance the mechanical properties of metals. Dislocation mechanisms to control strengthening during precipitation have been demonstrated extensively. However, owing to the complexity of different precipitates in alloys, variations in ductility caused by precipitation are very complex and have not been clarified so far. In this study, the effects of precipitation on ductility in precipitation hardening aluminium alloys are investigated based on a modified dislocation-based approach and experimental characterisation. The AlMgScZr alloy with spherical Al3(Sc, Zr) precipitates is used as a model alloy system to understand the effects of precipitation on ductility. Via heat treatment, shearable and non-shearable Al3(Sc, Zr) precipitates are introduced in the AlMg matrix. The results show that the ductility of AlMgScZr alloy decreases when shearable precipitates occur, while it increases during the shearable–non-shearable transition. The variation in ductility is mainly controlled by the dynamic recovery rate of the dislocations. This dislocation mechanism is supported by analysing the different precipitation–dislocation interactions and evaluating the dislocation density evolution during deformation. This study reveals the dislocation mechanism for controlling ductility during precipitation, which can provide a theoretical foundation for the design of high-performance structural materials.","PeriodicalId":442517,"journal":{"name":"MatSciRN: Other Mechanical Properties & Deformation of Materials (Topic)","volume":"11 5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-10-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116793753","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