Migration of grain boundaries in Zn

Migration of grain boundaries in Zn
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Zn 中晶界的迁移

DOI:
10.1016/j.actamat.2013.01.007
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发表时间:
2013
期刊:
影响因子:
9.4
通讯作者:
G. Gottstein
G. Gottstein
中科院分区:
材料科学1区
文献类型:
--
作者:
Chr. Günster;D. A. Molodov;G. Gottstein

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本文介绍了锌双晶(99.995%)晶界迁移的研究结果。一个在现场技术的观察和连续记录的边界迁移的测量应用于磁和曲率驱动的边界运动。研究了旋转角度在60-90°范围内的对称和非对称的<$101 <$0 <$$>和<$112 <$0 <$0倾斜晶界。对于磁驱动边界的绝对晶界迁移率被确定。测量了330°C至415°C范围内的边界运动,并确定了相应的迁移激活参数。结果表明,在所调查的角度范围内的晶界流动性的一个显着的取向差的依赖。Zn中倾斜晶界的迁移也取决于晶界倾斜度。在毛细管驱动力作用下,所研究的弯曲的101 <$0 <$倾斜边界的迁移激活参数与磁驱动的101 <$0 <$0倾斜边界的相应参数有明显的不同,磁驱动的倾斜边界具有相似的取向差角。所有研究边界的迁移活化参数均符合补偿定律,即活化焓与指前迁移率因子的对数之间存在线性关系。
The results of investigations of grain boundary migration in zinc bicrystals (99.995%) are presented. An in situ technique for the observation and continuous recording of boundary migration was applied for measurement of both magnetically and curvature driven boundary motion. Symmetrical and asymmetrical 〈101¯0〉 and 〈112¯0〉 tilt grain boundaries with rotation angles in the range 60–90° were studied. For magnetically driven boundaries the absolute grain boundary mobility was determined. The boundary motion was measured in the regime between 330°C and 415°C, and the corresponding migration activation parameters were determined. The results revealed a pronounced misorientation dependence of grain boundary mobility in the investigated angular range. Migration of tilt grain boundaries in Zn was also found to depend on boundary inclination. The migration activation parameters for the investigated curved 〈101¯0〉 tilt boundaries moving under a capillary driving force were distinctly different from the corresponding parameters obtained for magnetically driven 〈101¯0〉 tilt boundaries with similar misorientation angle. The migration activation parameters of all investigated boundaries comply with the compensation law, i.e. there is a linear relationship between the activation enthalpy and the logarithm of the pre-exponential mobility factor.
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