Li Z.,BERIS Engineering and Research Corporation |
Yan L.,Inner Mongolia University of Technology |
Shen J.,General Research Institute for Nonferrous Metals, China
Tezhong Zhuzao Ji Youse Hejin/Special Casting and Nonferrous Alloys | Year: 2013
The hot compression simulation of 7055 aluminum alloy was carried out on the Gleeble-1500D thermal simulator. The characteristics of hot compressive structure under different reductions was observed by OM and EBSD. The mechanical properties after heat treatment were tested, and the effects of hot deformation reduction on the microstructure and mechanical properties of 7055 aluminum alloy were investigated. The experimental results indicate that with the increase of reduction, the grains are significantly elongated, and the coarse second phase are stretched along the grain boundaries, and even broken up. Dynamic recrystallization locally occurs in 7055 aluminum alloy, which is attributed to strain-induced grain boundary migration. With the decrease of the volume fraction of recrystallization and the increase of grain contained sub-structure in 7055 aluminum alloy after heat treatment, mechanical properties of the alloys are improved greatly. The optimum mechanical properties can be obtained with the 79% reduction.
Zhang Z.,Changsha University |
Feng J.,BERIS Engineering and Research Corporation |
Zhang H.,Changsha University
Proceedings - 2012 International Conference on Intelligent Systems Design and Engineering Applications, ISDEA 2012 | Year: 2012
This paper proposes a new kind of parallel integer addition algorithm - the barrel integer addition algorithm on the basis of researching the structure of half adder. It also elaborates the principle and structure of barrel integer addition algorithm, analyses the time and the degree of complexity in the area of the algorithm and at the same time compares it with the traditional integer addition algorithm. We realized that the 16-bit barrel integer adder using Verilog HDL and verifies comprehensively in the Altera device. The result shows that the speed of the barrel integer adder designed in this paper improves obviously on the basis of a small increase of area, which lays the foundation for the improvement of the multiplier performance. © 2012 IEEE.
Wang H.Y.,Inner Mongolia University of Science and Technology |
Wang H.Y.,University of Science and Technology Beijing |
Gao X.,BERIS Engineering and Research Corporation |
Ren H.P.,Inner Mongolia University of Science and Technology |
And 3 more authors.
Materials Technology | Year: 2012
The microstructure and texture of cold rolled low carbon steel produced by compact strip production (CSP) after batch and continuous annealing have been investigated. Optical microscopy, bulk X-ray texture analysis and micro-orientation analysis with electron backscattered diffraction were conducted to investigate the general microstructure and texture in correlation with the mechanical properties as well as formability under the two annealing procedures. The results indicate that the microstructure of the cold rolled steel after batch annealing exhibits a special orientation relationship with the matrix in comparison to continuous annealing. As an explanation of the oval shaped grain character, the recrystallisation microstructure and texture evolution are discussed. It is concluded that annealing has a significant effect on the special orientation and texture formation of the CSP strip and thus to the formability and mechanical behaviour of the final products. © 2012 W. S. Maney & Son Ltd.
Wang H.-Y.,Inner Mongolia University of Science and Technology |
Wang H.-Y.,Key Laboratory of Integrated Exploitation of Bayan Obo Multi Metal Resources |
Gao X.-Y.,BERIS Engineering and Research Corporation |
Ren H.-P.,Inner Mongolia University of Science and Technology |
And 3 more authors.
Wuli Xuebao/Acta Physica Sinica | Year: 2014
The α-Fe Σ3 (112) symmetrical tilt grain boundary model is established by the coincidence site lattice theory. First-principles plane wave ultrasoft pseudopotential method based on the density functional theory is used to calculate the La occupying tendency in α-Fe. The results show that La elements tend to be located at grain boundary in the α-Fe since the impurity formation energy keeps lowest. On this basis, the electronic structure of La doped in α-Fe grain boundary is also calculated. The results indicate that the charges in the system are redistributed to provide more electrons for the grain boundary bonding when the La occupies α-Fe grain boundary. Meanwhile, Fe atoms obtain more electrons, and the La doped region combination has the ion-tendency toward strengthening the interaction between La atom and Fe atoms in the adjacent boundary region, and the Fe atom bonds in the grain boundaries and on both sides of the grain boundary also strengthen, which is the reason why the mechanical properties change from the energy point of view. Moreover, La addition also makes the atomic density of states on the grain boundary move to the left, reduce the total energy of the system, and make the grain boundary more stable. © 2014 Chinese Physical Society.
Liang Y.F.,University of Science and Technology Beijing |
Ge J.W.,University of Science and Technology Beijing |
Ge J.W.,BERIS Engineering and Research Corporation |
Fang X.S.,University of Science and Technology Beijing |
And 2 more authors.
Materials Science and Engineering A | Year: 2013
Hot deformation behavior of Fe-6.5. wt% Si alloy is studied by hot compression in the temperature range of 773-1373. K with different strain rates. It is found that dynamic recrystallization is the main softening mechanism in disordered phase regions in 1073-1373. K, while dynamic recovery is the main softening mechanism in ordered phase regions in 773-973. K. The strain rate sensitivity increases with temperature in 773-973. K, while decreases in 1073-1373. K. The apparent activation energy is calculated to be 211. kJ/mol in 1073-1373. K and 478. kJ/mol in 773-973. K. The function between steady flow stress and Zener-Hollomon parameter is deduced. Moreover, the relationship between steady flow stress and the grain size after deformation is presented the Hall-Petch relation. © 2013 Elsevier B.V..