Coarsening kinetics of coherent precipitates in Ni-Al-Mo and Fe-Ni-Al alloys
Coarsening kinetics of coherent precipitates in Ni-Al-Mo and Fe-Ni-Al alloys
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DOI：
10.1016/s0921-5093(98)80012-9
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发表时间：
1997-10-30
期刊：
影响因子：
6.4
通讯作者：
CabanasMoreno, JG
中科院分区：
文献类型：
--
作者：
Calderon, HA;Kostorz, G;CabanasMoreno, JG
本文研究了Ni-14.5at.%单晶试样共格γ '和β'相的后期粗化动力学Al-5.9原子% Mo和Fe-10原子% Ni-15原子%在老化后，Ni合金为1453 K，Fe合金为1233 K。扫描电子显微镜（SEM）显示，在粗化制度的早期，在Ni基合金中存在颗粒分裂。持续的老化改变了粒子的空间分布，从而导致许多粒子的群体的形成。在Fe基合金中，更早地看到颗粒群的形成。较长的时效处理产生大颗粒，这些大颗粒分裂形成板状沉淀物。两种合金中的颗粒迁移都很明显。镍基合金中颗粒的粗化动力学偏离了通常颗粒平均半径的立方与时效时间之间的线性关系。粗化速率降低，并且获得更宽的粒度分布。在铁基合金中，在SEM图像上的颗粒面积的直接测量显示出平均颗粒半径的立方与时效时间的线性依赖性。然而，在对颗粒形状进行校正之后，建议增加粗化速率。(C)1997年Elsevier Science S.A.
The late stage coarsening kinetics of coherent gamma' and beta' have been investigated in single crystalline specimens of Ni-14.5 at.% Al-5.9 at.% Mo and Fe-10 at.% Ni-15 at.% Al after aging at. 1453 K for the Ni alloy and 1233 K for the Fe alloy. Scanning electron microscopy (SEM) shows that early in the coarsening regime there is particle splitting in the Ni-base alloy. Continued aging changes the spatial distribution of particles giving rise to the formation of groups of many particles. In the Fe-base alloy, formation of particle groups is seen earlier. Longer aging treatments produce large particles that split forming plate like precipitates. Particle migration is evident in both alloys. The coarsening kinetics of particles in the Ni-base alloy show deviations from the usual linear behavior between the cube of the average particle radius and the aging time. There is a reduction of the coarsening rate and in addition broader particle size distributions are obtained. In the Fe-base alloy, direct measurements of particle areas on SEM images show a linear dependence of the cube of the average particle radius with the aging time. However, after correcting for particle shape an increase of the coarsening rate is suggested. (C) 1997 Elsevier Science S.A.