Grain boundary motion and grain rotation in aluminum bicrystals: recent experiments and simulations
Grain boundary motion and grain rotation in aluminum bicrystals: recent experiments and simulations
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铝双晶中的晶界运动和晶粒旋转：最近的实验和模拟
DOI：
10.1088/1757-899x/89/1/012008
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发表时间：
2015
期刊：
影响因子：
--
通讯作者：
J.-E. Brandenburg
中科院分区：
文献类型：
--
作者：
D. A. Molodov;L. A. Barrales-Mora;J.-E. Brandenburg
简要回顾了近年来在不同驱动力作用下不同几何形状晶界运动和晶粒旋转的实验和计算结果。描述了基于方向衬度成像的新型原位测量技术和应用的模拟技术。特别生长的铝双晶上获得的实验结果，并进行了讨论。特别地，讨论了小角度晶界在曲率力作用下的小面化和迁移行为。与纯倾斜边界，保持平坦/刻面和在高温退火过程中不动，混合倾斜扭曲边界容易假设一个弯曲的形状和稳定的毛细作用力下移动。计算分析表明，这种行为是由于晶界能的倾斜各向异性，这反过来又取决于边界的几何形状。采用分子动力学模拟方法研究了具有不同倾斜度和混合边界的圆柱形晶粒的形状演化和收缩动力学。实验< 100>和模拟结果表明，取向差大于10 °的低角度晶界的迁移率与高角度晶界的迁移率没有明显差别，但随着取向差的进一步减小，迁移率基本上减小.嵌入式晶粒在模拟中的形状演变被发现直接关系到能量计算的结果。进一步的模拟结果表明，纯倾斜晶界的晶粒收缩伴随着晶粒旋转。与此相反，倾斜扭曲边界的位错与混合边螺旋字符组成的晶粒不旋转，在其收缩。应力驱动的边界迁移在铝双晶被观察到耦合到切向平移的晶粒。高角度边界迁移的激活焓被发现随取向差角非单调变化，而对于低角度边界的迁移激活焓几乎相同。观察到的运动的混合倾斜扭转边界下的应力是伴随着相邻晶粒平行于边界平面的平移和它们的旋转周围的边界平面法线。
The results of experimental and computational efforts over recent years to study the motion of geometrically different grain boundaries and grain rotation under various driving forces are briefly reviewed. Novel in-situ measuring techniques based on orientation contrast imaging and applied simulation techniques are described. The experimental results obtained on specially grown aluminum bicrystals are presented and discussed. Particularly, the faceting and migration behavior of low angle grain boundaries under the curvature force is addressed. In contrast to the pure tilt boundaries, which remained flat/faceted and immobile during annealing at elevated temperatures, mixed tilt-twist boundaries readily assumed a curved shape and steadily moved under the capillary force. Computational analysis revealed that this behavior is due to the inclinational anisotropy of grain boundary energy, which in turn depends on boundary geometry. The shape evolution and shrinkage kinetics of cylindrical grains with different tilt and mixed boundaries were studied by molecular dynamics simulations. The mobility of low angle< 100> boundaries with misorientation angles higher than 10, obtained by both the experiments and simulations, was found not to differ from that of the high angle boundaries, but decreases essentially with further decrease of misorientation. The shape evolution of the embedded grains in simulations was found to relate directly to results of the energy computations. Further simulation results revealed that the shrinkage of grains with pure tilt boundaries is accompanied by grain rotation. In contrast, grains with the tilt-twist boundaries composed of dislocations with the mixed edge-screw character do not rotate during their shrinkage. Stress driven boundary migration in aluminium bicrystals was observed to be coupled to a tangential translation of the grains. The activation enthalpy of high angle boundary migration was found to vary non-monotonically with misorientation angle, whereas for low angle boundaries the migration activation enthalpy was virtually the same. The motion of the mixed tilt-twist boundaries under stress was observed to be accompanied by both the translation of adjacent grains parallel to the boundary plane and their rotation around the boundary plane normal.
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影响因子：
9.4
作者：
J.-E. Brandenburg;L. A. Barrales-Mora;D. A. Molodov;G. Gottstein
通讯作者：
G. Gottstein
晶界特征对晶粒旋转的影响
影响因子：
9.4
作者：
L. A. Barrales-Mora;J.-E. Brandenburg;D. A. Molodov
通讯作者：
D. A. Molodov
[001]旋转轴铜双晶晶界迁移动力学☆
DOI：
--
发表时间：
1973
期刊：
影响因子：
--
作者：
R. Viswanathan;C.L Bauer
通讯作者：
C.L Bauer
影响因子：
9.4
作者：
D. Bachurin;A. Nazarov;J. Weissmüller
通讯作者：
D. Bachurin;A. Nazarov;J. Weissmüller
影响因子：
3.7
作者：
Y. Ashkenazy;R. Averback;K. Albe
通讯作者：
Y. Ashkenazy;R. Averback;K. Albe