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In situ straining in the transmission electron microscope and diffraction-contrast electron tomography has been applied to investigate dislocation interactions in α-Ti. Dislocation debris, in the form of small loops, was seen to form from sequential cross-slip events. Electron tomography provided direct three-dimensional visualisation of the dislocation structures, allowing accurate identification of slip planes, dislocation line directions and spatial relations between dislocations. 相似文献
994.
Yunhao Huang Jincheng Wang Zhijun Wang Junjie Li 《Journal of Applied Crystallography》2019,52(5):1176-1188
995.
Changcheng Mi Junjing Ding Yanhuan Cai Bing Zhou Hui Dong Jianming Luo Xinming Huang 《Crystal Research and Technology》2019,54(3)
The performance of high‐performance multicrystalline silicon ingots is studied as a function of fused quartz seed particle size. Four kinds of Si ingots are grown using fused quartz particles having four distinct particle sizes, seed Nos. 1–4, corresponding to mesh sizes of 10–30, 30–50, 50–70, and 70–100, respectively. Each seed type is employed to have the same particle density area of ≈220 particles per cm2. The experimental results show that the Si ingot grown using 50–70 mesh seeds (seed No. 3) has the best uniformity of initial nucleation and subsequent grains, resulting in the lowest density of dislocation clusters. The Si ingots are cut into bricks and Si wafers are sliced from different positions of each brick and further studied. As a result, the average conversion efficiency is the highest for the ingot grown using No. 3 seeds (50–70 mesh) at 18.34%, ≈0.22% (absolute value) higher than that observed when employing 10–30 mesh seeds (seed No. 1, 18.12%). 相似文献
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D. V. Georgievskii W. H. Müller B. E. Abali 《ZAMM - Journal of Applied Mathematics and Mechanics / Zeitschrift für Angewandte Mathematik und Mechanik》2019,99(12)
Especially in metal forming, large plastic deformation occurs in thin plates. The problem of compressing dies is analyzed to evaluate the spreading of a thin layer in between. The velocity of dies is a given function in time so that the kinematics of the process is known. This problem can be considered as a generalization of the classical Prandtl problem by taking inertial effects into account and introducing dimensionless parameters as internal variables depending on time. The first parameter is purely geometric corresponding to the thin‐layer approximation; the second and the third parameters are dimensionless velocity and acceleration during the dies getting pressed. We use singular asymptotic expansions of unknown functions and study how these parameters vary preceding the dies of moment. Depending on this relation, the dynamic corrections to the quasistatic solution is a part of various terms of the asymptotic series. The corresponding analytical investigation both for general case and for particular typical regimes of plates motion is carried out. 相似文献
1000.
Jan Eike Schnabel Swantje Bargmann Jonathan David Heaton Paul Michael Oehring Florian Pyczak 《哲学杂志》2019,99(2):148-180
The relative activity of deformation systems during work hardening and thermal recovery has been investigated in fully lamellar TiAl. This has been done by a combination of a series of deformation/static recovery experiments and numerical simulations based on a defect density-based crystal plasticity model. Firstly, active deformation systems in differently oriented polysynthetically twinned crystals/single lamellar colonies have been studied. Subsequently, numerical experiments on a polycolony microstructure have been used to investigate the inhomogeneous microplasticity (i.e. the typical microyield) in fully lamellar TiAl. From this, it has been possible to analyse how changes in the lamella thickness, domain size and colony size influence the onset of macroscopic yield. Based on static recovery experiments with differently oriented polysynthetically twinned crystals, numerical studies have revealed trends in the recovery of work hardening in both polysynthetically twinned crystals and polycolony microstructures. 相似文献