Grain boundary diffusion and segregation of Ni in Cu
Grain boundary diffusion and segregation of Ni in Cu
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DOI：
10.1016/j.actamat.2007.01.032
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发表时间：
2007-06-01
期刊：
影响因子：
9.4
通讯作者：
Herzig, Christian
中科院分区：
文献类型：
--
作者：
Divinski, Sergiy;Ribbe, Jens;Herzig, Christian
用放射性示踪技术在476 ~ 1156 K的温度区间内研究了Ni-63在多晶Cu中的晶界扩散。在Harrison的C和B动力学状态中的独立测量导致GB扩散率D-gb和所谓的三重积P = s中心点δ中心点Dgb（s和δ分别是偏析因子和扩散GB宽度）的直接数据。测量了Dgb和P值的Arrhenius型温度依赖性，得到指前因子D-gb（0）= 6.93 x 10（-7）m（2）s（-1）和P-0 = 1。89 × 10 ~（-16）m ~（3）s ~（-1），活化能分别为90.4和73.8 kJ mol ~（-1）。虽然镍是完全可溶于铜，它揭示了一个独特的，但仍然适度的能力，偏析铜GB的偏析焓约为17 kJ mol（-1）。(C)2007 Acta Materialia Inc.由爱思唯尔有限公司出版。保留所有权利。
Grain boundary (GB) diffusion of Ni-63 in polycrystalline Cu was investigated by the radiotracer technique in an extended temperature interval from 476 to 1156 K. The independent measurements in Harrison's C and B kinetic regimes resulted in direct data of the GB diffusivity D-gb and of the so-called triple product P = s center dot delta center dot Dgb (s and delta are the segregation factor and the diffusional GB width, respectively). Arrhenius-type temperature dependencies for both the Dgb and P values were measured, resulting in the pre-exponential factors D-gb(0) = 6.93 x 10(-7) m(2) s(-1) and P-0 = 1. 89 x 10(-16) m(3) s(-1) and the activation enthalpies of 90.4 and 73.8 kJ mol(-1), respectively. Although Ni is completely soluble in Cu, it reveals a distinct but still moderate ability to segregate copper GBs with a segregation enthalpy of about 17 kJ mol(-1). (C) 2007 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.