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

{"title":"Effect of Plastic Fibers on Properties of Foamed Concrete","authors":"H. Ahmed, W. Abbas, Doha M. AlSaffar","doi":"10.30684/etj.31.7a7","DOIUrl":"https://doi.org/10.30684/etj.31.7a7","url":null,"abstract":"The main objective of this work is to study the effect of adding plastic fibers on Lightweight Aggregate Foamed Concrete (LWAFC) using mix proportion of 1:2.6:0.4 by volume (cement: fine Porcelanite: coarse Porcelanite) with 2% foaming agent by weight of water, and using sand as a partial and total replacement of local Porcelanite aggregate in that mix. \u0000The properties of lightweight aggregate foamed concrete reinforced with different percentages of plastic fiber (0.5, 0.75, and 1% by volume) were studied. Compressive strength, splitting tensile strength, flexural strength, dry density, initial surface absorption, water absorption, ultrasonic pulse velocity, acoustic impedance, and impact resistance tests were conducted on mixes at ages of 7, 28, and 60 days. \u0000The results showed a significant increasing in impact resistance, splitting tensile strength, and water absorption 34.55%, 4.2%, 326%, and 27.3% respectively. While the results indicated that the compressive strength, ultrasonic pulse velocity, dry density and acoustic impedance of the composites were reduced when the crimped plastic fiber volume fraction increases. The percentage of reduction of these properties was 15%, 11.1%, 6.23%, and 12.55% respectively","PeriodicalId":442517,"journal":{"name":"MatSciRN: Other Mechanical Properties & Deformation of Materials (Topic)","volume":"74 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114494423","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}

{"title":"A Novel Grain Refinement Design to Inhibit Liquation Cracking in Laser Cladding Non-Weldable Nickel-Based Alloy","authors":"Zhenlin Zhang, Yue Zhao, J. Shan, A. Wu, Tokita Shun, Y. Sato, K. Kadoi, H. Inoue, H. Gu, Xin Tang","doi":"10.2139/ssrn.3675958","DOIUrl":"https://doi.org/10.2139/ssrn.3675958","url":null,"abstract":"The liquation cracking is easily induced in the heat-affected zone during laser cladding repairing the non weldable nickel-based superalloy, and there are currently no effective solutions. A novel grain refinement design strategy is proposed for laser cladding repairing non weldable superalloy. In the new strategy, static recrystallization, simulated by the heat from the molten pool, occurs in the plastic deformation region of the base metal pretreated via mechanical shot peening in the heating process of laser cladding. As a result, the coarse columnar crystal structure converts into fine equiaxed crystal structure in the heat-affected zone. The evolution behaviors of liquid film and recrystallization were studied via in-situ observation, and sound laser cladding layers were obtained.","PeriodicalId":442517,"journal":{"name":"MatSciRN: Other Mechanical Properties & Deformation of Materials (Topic)","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126539606","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}

{"title":"Deformation Mechanism of Selective Laser Melted 316L Stainless Steel and Its Cellular Substructure Dependence","authors":"F. He, Chao Wang, B. Han, G. Yeli, Xin Lin, Zhijun Wang, Lilin Wang, J. Kai","doi":"10.2139/ssrn.3875238","DOIUrl":"https://doi.org/10.2139/ssrn.3875238","url":null,"abstract":"The selective laser melted (SLM) 316L stainless steel (316L SS) has shown superior tensile ductility and doubled yield strength compared to its wrought counterpart. The significantly improved yield strength has been attributed to the unique cellular substructures that are featured by Cr/Mo-segregation and trapped dislocations. However, the excellent tensile ductility was still vaguely ascribed to pronounced deformation twinning without clear reasons. The effect of cellular substructure on the deformation mechanism also remains unrevealed. In the present study, we investigated the deformation mechanism of the SLM 316L SS using comprehensive transmission electron microscope (TEM) analysis. Besides active deformation twinning, deformation faulting and dislocation cell refinement were also featured during the whole tensile deformation. Deformation faulting and dislocation cell refinement synergistically dominate the deformation behavior at low strain levels, and deformation twinning and faulting play a crucial role at medium and high strain levels. Our results showed that the cellular substructure is mainly responsible for the marked deformation faulting and twinning. The pre-existed SFs in cellular substructure promoted the deformation faulting by providing faulting nuclei. The overlapped wide SFs, together with the cellular boundaries, resulted in pronounced deformation twinning through the Fujita-Mori twining mechanism. The multiple deformation mechanisms jointly led to a steady strain hardening rate during tension and thus a superior tensile ductility of SLM 316L SS.","PeriodicalId":442517,"journal":{"name":"MatSciRN: Other Mechanical Properties & Deformation of Materials (Topic)","volume":"85 1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122660598","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}

{"title":"In Situ Study on the Compression Deformation Behavior of MoNbTaVW High-Entropy Alloy","authors":"Congyan Zhang, B. Yue, U. Bhandari, Oleg N Starovoytov, Yan Yang, D. Young, Jinyuan Yan, F. Hong, Shizhong Yang","doi":"10.2139/ssrn.3711238","DOIUrl":"https://doi.org/10.2139/ssrn.3711238","url":null,"abstract":"The excellent mechanical properties of high-entropy alloys make them advanced materials in science and technology. However, the underlying mechanism of plastic deformation is not well understood. In <i>situ</i> experiments are urgently required to provide a fundamental understanding of the plastic deformation under high pressure. We performed in <i>situ</i> synchrotron x-ray diffraction experiments to study compression deformation behavior of MoNbTaVW in a radial diamond anvil cell. Our results show that the strength and ratio of the stress-to-shear modulus values are ~1.5 and 3 times of that of pure tungsten, respectively. MoNbTaVW yields at around 5 GPa and then developed a much stronger texture as compared with pure W. This work provides clear evidence that active dislocation behavior is mainly responsible for the high strength in MoNbTaVW under compression. The unique technique also opens a new avenue to investigate the in <i>situ</i> mechanical properties and their mechanisms in other types of alloys.","PeriodicalId":442517,"journal":{"name":"MatSciRN: Other Mechanical Properties & Deformation of Materials (Topic)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130758826","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}

{"title":"Effect of Zr Addition and Heat Treatment on Microstructure and Mechanical Properties of Suction Cast Al-Si-Cu Alloys","authors":"S. Mondol, U. Bansal, M. Singh, S. Dixit, A. Mandal, A. Paul, K. Chattopadhyay","doi":"10.2139/ssrn.3927818","DOIUrl":"https://doi.org/10.2139/ssrn.3927818","url":null,"abstract":"The role of Zr addition and a three-stage heat treatment to suction cast Al-(6-8)Si-Cu (at%) alloys are studied, emphasizing the microstructure, its stability, and high-temperature tensile properties. The addition of 0.15 at% Zr to the alloys refines the microstructure. The suction casting resulted in the high supersaturation of Zr in the dendrite interiors. When aged directly at 450 ℃, it leads to fine, spherical, coherent L12 order Al3Zr precipitates of size 9-11 nm in the α-Al matrix. After further ageing at 190 ℃ following a brief solutionizing at 500 ℃, the alloys develop a fine-scale microstructure achieved through heterogeneous nucleation of θʹ plates on Al3Zr precipitates formed during initial ageing. These plates are finer in size (~58-67 nm in length and ~4 nm in thickness) than the plates formed in Al-6Si-Cu alloy aged at 190 °C after normal solutionizing (~234 nm in length and ~9.3 nm in thickness). The complex microstructure with a finer length scale rationalizes the high yield strength of the Zr modified alloys (306-320 MPa at room temperature), which is 1.7 times higher than the corresponding Al-6Si-Cu alloy. EDS composition analysis shows the partitioning of Zr and Si in θ' plates that impart long-term thermal stability and coarsening resistance at 250 °C. It leads to a yield strength of ~140 MPa under tension at 250 °C. The coarsening of θ' plates was ledge controlled in Al-(6-8)Si-Cu-Zr alloys.","PeriodicalId":442517,"journal":{"name":"MatSciRN: Other Mechanical Properties & Deformation of Materials (Topic)","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132261169","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}

{"title":"Atomistic Mechanisms of Twin-Twin Interactions in Cu Nanopillars","authors":"G. Sainath, S. Goyal, A. Nagesha","doi":"10.2139/ssrn.3507468","DOIUrl":"https://doi.org/10.2139/ssrn.3507468","url":null,"abstract":"Twinning is an important mode of plastic deformation in metallic nanowires. When twinning occurs on multiple systems, it is possible that twins belonging to different twin systems interact and forms a complex twin-twin junctions. However, limited attention has been paid to characterize the twin-twin interactions in nanowires. In this paper, we report two different twin-twin interactions/junctions, one containing two twin boundaries along with one ∑9 boundary and the other with five twin boundaries (five-fold twin), which are observed during the deformation of Cu nanowires. Further, we explain the detailed mechanisms responsible for the formation of such junctions using atomistic simulations.","PeriodicalId":442517,"journal":{"name":"MatSciRN: Other Mechanical Properties & Deformation of Materials (Topic)","volume":"205 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134057146","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}

{"title":"Bending-Induced Triple Twins in Single-Crystalline Ni-Mn-Ga Samples: Measurements with Digital-Image-Correlation (DIC) Method","authors":"Danxian Chen, P. Du, Jiong Wang","doi":"10.2139/ssrn.3610483","DOIUrl":"https://doi.org/10.2139/ssrn.3610483","url":null,"abstract":"Three-point bending tests are conducted on two single-crystalline Ni-Mn-Ga samples. The responses of the samples are recorded and the strain distributions in the samples are measured by using the digital-image-correlation (DIC) method. It is observed that two connected triple twins are generated in the middle portion of each sample. Correspondingly, the response curves exhibit some peak-valley combination segments. The characteristics of mechanical behaviors of the samples are discussed and are compared with those observed in the axial compression tests. The arrangements of lattice structures in the different variant regions are also analyzed.","PeriodicalId":442517,"journal":{"name":"MatSciRN: Other Mechanical Properties & Deformation of Materials (Topic)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131385473","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}

{"title":"Mechanical Properties And γ/γ' Interfacial Misfit Network Evolution: A Study Towards the Creep Behavior of Ni-Based Single Crystal Superalloys","authors":"A. Khoei, Mehrdad Youzi, G. Tolooei Eshlaghi","doi":"10.2139/ssrn.3893500","DOIUrl":"https://doi.org/10.2139/ssrn.3893500","url":null,"abstract":"The aim of this study is to investigate the role of the temperature, stress, strain rate, and rhenium (Re) on the γ/γ' interfacial misfit dislocation network and mechanical response of Ni-based single crystal superalloys. Due to the mismatch between the two phases, a dislocation network forms after aging at high temperatures to alleviate the stress field. The (100), (110), and (111) phase interface models are generated to further study the properties of the superalloy by applying molecular dynamics simulations. It is noted that the strength and stability of the network are diminished as the thermal condition intensifies owing to the dispersed atomic potential energy at the interface. By applying a constant strain rate of 2x108 (s-1) at 0 K, the (100) and (111) phase interface models lose the co-coordinating role of maintaining the dynamic equilibrium. Hence, dislocations pile-up in the damaged area, and the network is no longer able to fortify the interface. For the (110) phase interface model, the dominant deformational mechanism is precipitate shearing. As temperature increases, the elastic modulus, initial mismatch stress, and yield strength decrease. Moreover, the yield strength of material increases as the strain rate increases. The pinning effect of Re atoms is surveyed by replacing 3.293at%, and 5at% of matrix Ni atoms with Re at 1600 K. The dislocation hampering property of Re is more perceptible when enough dislocations in the γ phase are moving at elevated temperatures. In addition, Re manages to soothe the stress field at the interface and does not affect the network morphology. Finally, an investigation of the creep behavior of the superalloy is provided. It is observed that the escalated damage to the interfacial network due to the increased temperature leads to the domination of the softening mechanisms (cross-slip and dislocation climb) on the deformation and shortens the steady-state creep. Moreover, Re atoms act as an extra hardening factor to improve the tertiary creep.","PeriodicalId":442517,"journal":{"name":"MatSciRN: Other Mechanical Properties & Deformation of Materials (Topic)","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121077246","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}