Grain growth and kinetics for nanocrystalline magnesium alloy produced by mechanical alloying
Grain growth and kinetics for nanocrystalline magnesium alloy produced by mechanical alloying
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DOI：
10.1016/s0025-5408(01)00578-5
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发表时间：
2001-03-01
影响因子：
5.4
通讯作者：
Lai, MO
中科院分区：
文献类型：
--
作者：
Cao, P;Lu, L;Lai, MO
对机械合金化Mg-12.1wt%Cu合金的晶粒长大动力学进行了研究。机械合金化粉末和冷压退火粉末的晶粒尺寸由X射线谱线的展宽确定。随着退火时间的延长，晶粒尺寸先减小，然后逐渐增大，最后不再达到一个极限值。根据等温退火，晶粒生长动力学可以由D-n - D-0（n）= ct描述，其中n（n = 5至8）是基本上取决于退火温度的常数。晶粒长大激活能Q为118 kJ/mol，比纯镁的晶粒长大激活能Q高26 kJ/mol。球磨过程中产生的第二相金属间化合物Mg 2Cu不仅影响激活能，而且影响动力学方程的指数。(C)2001爱思唯尔科技有限公司版权所有。
A study on the kinetics of grain growth of an Mg-12.1 wt%Cu alloy produced by mechanical alloying was carried out. The grain sizes of as-mechanically alloyed powder and of cold-compacted annealed powder were determined from the broadening of X-ray lines. The grain size deceases initially due to recrystallization and then increases gradually, and finally ceases to reach an ultimate value regardless of annealing time. From isothermal anneals, the grain growth kinetics can be described by D-n - D-0(n) = ct, where n (n = 5 to 8) is a constant essentially dependent on the annealing temperature. The activation energy for grain growth Q has been determined to be 118 kJ/mol, which is longer by 26 kJ/mol than that for pure magnesium. Second-phase intermetallic particle Mg2Cu produced during ball-milling influences not only on activation energy but also on exponent of the kinetic equation. (C) 2001 Elsevier Science Ltd. All rights reserved.