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Directional solidification of a strong magnetic field on the eutectic alloy Al-Al2Cu of dislocation


Study, the transformation from high-resolution image for the FFr,[link widoczny dla zalogowanych], the filtering out noise in the corresponding diffraction spots, do the inverse FFT transform. Select the region in which there is further analysis of the dislocation, the corresponding results shown in Figure 4. Figure 410T directional solidification under high magnetic eutectic Al-Al2Cu HREM image in which the dislocation, dislocation exists in the crystal plane {111} A1 family above the lattice distortion around the region as a closed loop, as shown in the black dotted line . The left and right sides are all six atomic distance, the distance between atoms to 7 above, below are the six atomic distances, and thus obtain Burgers vector b shown in the short segment from the color shown. Figure 4 Simulation of crystal structures, have Figure 5. Further analysis of Figure 5, we can see 1 / 2 type Burgers vector, which belongs to the presumption of such dislocation 112 dislocation. For the fcc structure of the matrix, the {111} as the most close-packed ● ● ● ● ● ● ● ● · Il0 >··'. 1lll '. ● · · Figure 5,[link widoczny dla zalogowanych], magnetic field directional solidification AI. A12Cu eutectic dislocation simulation maps atomic planes,[link widoczny dla zalogowanych], the maximum spacing, and . For the {111} l the most close-packed atomic plane direction, the direction of the smallest atomic spacing (minimum distance between atoms in units of 1 / 2 ), atomic position to move to the adjacent minimum required to overcome the barrier, it is easy to along the . The direction of slip, resulting in 1 / 2 type dislocation. To intense magnetic fields, due to the strong magnetic field changes the dynamic state of thermodynamic solidification, the A1. Al2cu eutectic structure becomes disordered, the middle piece twisted contacts solidification process, resulting in a lot of internal stress, prompting slip inside atoms, it produces in the matrix 1 / 2 dislocation. 4 Conclusion (1) strong magnetic field of directional solidification A1. Al2Cu eutectic growth, to bring the organization to become disordered distorted grains increased stress, resulting in a large number of dislocations. (2) 10T strong magnetic field directional solidification of A1. Al2Cu eutectic alloy exists in a large number of dislocations in the Al matrix by the analysis of error for the upper 1 / 2 type. References [1] Wang Hui, Ren Zhongming, DENG Kang and so on. Magnetic field on Bi. Mn alloy phase two-phase region in the solidification structure of MnBi [J]. Metal Technology. 2OO2, 38 (1): 41 [2] BrahhwalteD, BeaugnonE. Magneticallycon ~ olledconvectioninaparamngnetiefluid [J]. Nature. 1991.354:134 [3] del ~ ngoP. LeesM,[link widoczny dla zalogowanych], I seven jayP. Texturingofmagneticmaterialsathightemperaturebysolidificationinamagneticfield [J]. Nature. 1991. 349:770 [4] Wu Qiong,[link widoczny dla zalogowanych], Zhong-Ming Ren. Returned and so on. Strong magnetic field on the directional solidification of Bi / MnBi eutectic of the preliminary study [J]. Progress in Natural Science. 2004,13 (7): 830 [5] DecarloJL, PirichRG. EffectofappliedmagneticfieldsduringdirectionalsolidificationofeutectieBi. Mn [J]. Met. Trans. 1984, l5A: 2155 [6] YasudaH, OhnakaI. Processingforal Ba slructttrebyamagneticfield [J]. CAMP-ISIJ, 20O0.13: 148 [7] Hu H Q.. Metal solidification principles. Second Edition. Beijing: Metallurgical Industry Press. 2000,175 ~ 188 [8] CantorB. ChadwickGA. ThegrowthcrystallographyofunidirectionallysolidifiedAI-AI3NiandAI-AhCueutectic [J]. JournalofCrystalGrowth. 1974. 23:12 Revised Date received: 20o6.02.16

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