The Experts below are selected from a list of 20670 Experts worldwide ranked by ideXlab platform
Pan Xiao - One of the best experts on this subject based on the ideXlab platform.
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interaction between the edge dislocation dipole pair and interfacial misfit dislocation network in ni based single crystal superalloys
International Journal of Solids and Structures, 2021Co-Authors: Zhiwei Zhang, Jun Wang, Rong Yang, Pan XiaoAbstract:Abstract Understanding the intrinsic Strengthening Mechanism is of great significance for microstructural design of Ni-based single crystal superalloys. In this paper, from an atomistic perspective, the interacting Mechanism between edge dislocation dipole pair and interfacial misfit dislocation network has been elaborated. It is shown that a network of interfacial misfit dislocations can effectively impede the movement of matrix dislocations, accommodate and pile up the edge dislocation dipole pairs in Ni matrix. Furthermore, we have systematically elucidated the influence of loading rates on the stimulating period of edge dislocation dipole pairs and stiffness of Ni/Ni3Al substrate. These findings provide a better understanding of the interfacial Strengthening Mechanism of Ni-based single crystal superalloys.
Jun Wang - One of the best experts on this subject based on the ideXlab platform.
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interaction between the edge dislocation dipole pair and interfacial misfit dislocation network in ni based single crystal superalloys
International Journal of Solids and Structures, 2021Co-Authors: Zhiwei Zhang, Jun Wang, Rong Yang, Pan XiaoAbstract:Abstract Understanding the intrinsic Strengthening Mechanism is of great significance for microstructural design of Ni-based single crystal superalloys. In this paper, from an atomistic perspective, the interacting Mechanism between edge dislocation dipole pair and interfacial misfit dislocation network has been elaborated. It is shown that a network of interfacial misfit dislocations can effectively impede the movement of matrix dislocations, accommodate and pile up the edge dislocation dipole pairs in Ni matrix. Furthermore, we have systematically elucidated the influence of loading rates on the stimulating period of edge dislocation dipole pairs and stiffness of Ni/Ni3Al substrate. These findings provide a better understanding of the interfacial Strengthening Mechanism of Ni-based single crystal superalloys.
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Strengthening Mechanism of twin lamellas in transparent alon ceramics
Journal of The European Ceramic Society, 2018Co-Authors: Huilu Guo, Jun Wang, Jian Zhang, Fang Zhang, Xiaojian Mao, Feng Sun, Feng Chen, Run Tian, Juan Liu, Shiwei WangAbstract:Abstract Twin lamellas, were observed in transparent AlON ceramics in our previous work. In this work, the influence of the twin lamellas on mechanical strength was evaluated and its Mechanism was investigated by SEM, EBSD, and HRTEM. Both the crystallographic direction and the space direction of a crack will deflect when it propagates across a twin lamella. The dynamic Mechanism is that the dislocation propagation in front of the crack tips is blocked by the twin boundaries. Because the fraction of twin boundaries increases with grain size in transparent AlON ceramics, the Strengthening effect becomes more notable for large-sized samples resulting in inverse Hall-Petch relation. It is a potentially useful way to advance the mechanical properties of transparent AlON ceramics by controlling the content of twin lamellas.
Zhiwei Zhang - One of the best experts on this subject based on the ideXlab platform.
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interaction between the edge dislocation dipole pair and interfacial misfit dislocation network in ni based single crystal superalloys
International Journal of Solids and Structures, 2021Co-Authors: Zhiwei Zhang, Jun Wang, Rong Yang, Pan XiaoAbstract:Abstract Understanding the intrinsic Strengthening Mechanism is of great significance for microstructural design of Ni-based single crystal superalloys. In this paper, from an atomistic perspective, the interacting Mechanism between edge dislocation dipole pair and interfacial misfit dislocation network has been elaborated. It is shown that a network of interfacial misfit dislocations can effectively impede the movement of matrix dislocations, accommodate and pile up the edge dislocation dipole pairs in Ni matrix. Furthermore, we have systematically elucidated the influence of loading rates on the stimulating period of edge dislocation dipole pairs and stiffness of Ni/Ni3Al substrate. These findings provide a better understanding of the interfacial Strengthening Mechanism of Ni-based single crystal superalloys.
Bin Liu - One of the best experts on this subject based on the ideXlab platform.
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investigation of Strengthening Mechanism of commercially pure titanium joints fabricated by autogenously laser beam welding and laser mig hybrid welding processes
The International Journal of Advanced Manufacturing Technology, 2019Co-Authors: Feng Zhang, Bin Liu, Tianzhu Sun, Shujin Chen, Yingtao TianAbstract:In this study, in order to achieve a better understanding of the Strengthening Mechanism in the commercially pure (CP) Ti welds, autogenously laser beam and laser-MIG hybrid welding of 4.2 mm thick CP-Ti plates were performed and the correlation between microstructure, texture distribution and the mechanical properties were systematically investigated. Microstructural coarsening and increase in microhardness were observed in the HAZ and WZ. The tensile test results suggested the base metal was the weak point of the joint for both welding conditions. The EBSD observations confirmed that a large number of $$ \left\{10\overline{1}2\right\} $$ and $$ \left\{11\overline{2}2\right\} $$ twin grains occurred in the HAZ and WZ of both welded joints, while a higher concentration of these twin grains were found in the laser-MIG hybrid joints. High concentration of the twin grain boundaries can act as barrier to stop dislocation slip during deformation and therefore contribute to the Strengthening of the welds. The existence of very small twin grains and acicular α phase in HAZ and WZ would equivalently reduce the averaged grain size and therefore induce an increase in strength based on Hall-Petch’s law. In addition, the averaged Schmid factor of BM is higher than that of the WZ and HAZ in both welding joints suggesting that the grain boundary sliding will take place preferably in BM during deformation so that the necking and fracture occurred in base metal during tensile tests of both welding joint specimens.
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Strengthening Mechanism in a high strength carbon containing powder metallurgical high entropy alloy
Intermetallics, 2018Co-Authors: Jiawen Wang, Bin Liu, C T Liu, Yong LiuAbstract:Abstract A carbon-containing FeCoCrNiAl0.5 high entropy alloys (HEAs) with high tensile strength was fabricated by powder metallurgy (P/M) method. The P/M process includes gas atomization and hot extrusion of pre-alloyed HEA powder. The microstructural evolution and mechanical properties were systematically investigated using X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and tensile tests. The results showed that the gas-atomized HEA powder was of dual phase, including face centered cubic (fcc) phase and B2 phase. Hot extrusion caused the precipitation of M23C6 carbides, the formation of dislocations and the refinement of microstructure. The as-extruded HEA exhibited a tensile strength as high as 1093 MPa and an elongation of ∼12.4%. The contributions of different Strengthening Mechanisms were quantitatively calculated, and it was found that the grain boundary Strengthening and the dislocation Strengthening are the main Strengthening Mechanism.
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atomic scale Strengthening Mechanism of dislocation obstacle interaction in silicon carbide particle reinforced copper matrix nanocomposites
Ceramics International, 2017Co-Authors: Bin Liu, Qihong Fang, Zaiwang Huang, Youwen LiuAbstract:Abstract Using molecular dynamics (MD) simulations, the Strengthening Mechanism of silicon carbide (SiC) particle acted as barrier for the motion of edge dislocation in copper (Cu) matrix nanocomposites under shear loading is investigated. The dislocation glide behavior and the dislocation-particle interaction accounting for the effect of the temperature and the particle size are discussed in terms of the stress-strain relationship, the crystal energy change, the stress distribution and the dislocation evaluation. The results show that the critical depinning stress and the critical depinning strain are found to vary significantly depending upon the temperature and the particle size, consistent with previous studies. Higher temperature or smaller particle results in lower critical depinning stress to allow dislocation to bypass particle. Moreover, the critical depinning stress from the current atomic study is lower than the theoretical value due to the presence of cross-slip and thermal activation. At low temperature the mechanical activation controls the depinning stress of the dislocation bypassing particle, while at high temperature the thermal activation dominates that. In addition, the trapping sites of dislocations for the dislocation multiplication are observed at high temperature or large particle, due to the lattice mismatch of particle taken as the dislocation source. Compared to the dislocation interacting with void or metal-particle, the interaction of dislocation and SiC-particle in Cu + SiC nanocomposite reveals much complex factors, such as the multiple glide planes, the nanosize effect, as well as the coupling effect of mechanical and thermal activation, on the Strengthening Mechanism. It maybe apply these results to a high throughput experimental design which provides the dense and targeted material data, to accelerate material discovery with the large-scale and low-cost fabrication strategies.
Rong Yang - One of the best experts on this subject based on the ideXlab platform.
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interaction between the edge dislocation dipole pair and interfacial misfit dislocation network in ni based single crystal superalloys
International Journal of Solids and Structures, 2021Co-Authors: Zhiwei Zhang, Jun Wang, Rong Yang, Pan XiaoAbstract:Abstract Understanding the intrinsic Strengthening Mechanism is of great significance for microstructural design of Ni-based single crystal superalloys. In this paper, from an atomistic perspective, the interacting Mechanism between edge dislocation dipole pair and interfacial misfit dislocation network has been elaborated. It is shown that a network of interfacial misfit dislocations can effectively impede the movement of matrix dislocations, accommodate and pile up the edge dislocation dipole pairs in Ni matrix. Furthermore, we have systematically elucidated the influence of loading rates on the stimulating period of edge dislocation dipole pairs and stiffness of Ni/Ni3Al substrate. These findings provide a better understanding of the interfacial Strengthening Mechanism of Ni-based single crystal superalloys.
