Experimental study of grain refinement mechanism in undercooled Ni-15at.%Cu alloy
Experimental study of grain refinement mechanism in undercooled Ni-15at.%Cu alloy
复制标题
实验%20研究%20of%20晶粒%20精炼%20机制%20in%20过冷%20Ni-15at.%Cu%20合金
DOI：
10.1557/jmr.2010.0257
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发表时间：
2010-10
影响因子：
2.7
通讯作者：
Wang HF
中科院分区：
文献类型：
--
作者：
Yang GC;Liu F;Wang HF
采用玻璃熔剂和循环过热相结合的方法，对过冷的Ni-15at.%Cu合金进行快速凝固。分析了显微组织和微观织构的演变过程。在低过冷度和高过冷度条件下，都能观察到枝晶发达，枝晶内部和周围均以细小的等轴晶分布。在低过冷度下，完全细化的组织呈现出高度取向的织构，而在高过冷度下，则出现了完全随机的织构和大量的退火孪晶。在此基础上，讨论了各种可能的细化机制及其对组织形成的影响。低过冷度和高过冷度下的晶粒细化均源于枝晶的破碎。特别是在高过冷度时，由于枝晶变形(流体流动)和枝晶碎裂(为再结晶形核和出现的再结晶晶粒提供晶界位置)，发生了再结晶，并在晶粒细化和完全无序织构的形成中发挥了作用。
Applying glass fluxing and cyclic superheating, rapid solidification of undercooled Ni-15at.%Cu alloy was performed by rapidly quenching the sample after recalescence. The evolution of microstructure and microtexture has been analyzed. At both low and high undercoolings, well-developed dendrites, within and around which are distributed by the fine equiaxed grains, are observed. At low undercooling, the completely grain-refined microstructure shows a highly oriented texture without annealing twins, whereas at high undercooling a fully random texture as well as a number of annealing twins is observed. On this basis, all the possible mechanisms for grain refinement, as well as their effects on the microstructure formation, were discussed. The grain refinement at both low and high undercoolings is concluded to originate from dendrite fragmentation. Particularly, at high undercooling, recrystallization, as a consequence of dendrite deformation (by fluid flow) and dendrite fragmentation (which provides grain boundary sites for recrystallization nucleation and for the “appearing” recrystallized grains), occurs and plays a role in the grain refinement and the formation of fully random texture.
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影响因子：
9.4
作者：
F. Gärtner;A. Norman;A. L. Greer;A. Zambon;E. Ramous;K. Eckler;D. Herlach
通讯作者：
F. Gärtner;A. Norman;A. L. Greer;A. Zambon;E. Ramous;K. Eckler;D. Herlach
DOI：
10.1016/s0921-5093(97)80044-5
发表时间：
1997-06
影响因子：
6.4
作者：
F. Gärtner;S. A. Moir;A. Norman;A. L. Greer;D. Herlach
通讯作者：
F. Gärtner;S. A. Moir;A. Norman;A. L. Greer;D. Herlach
影响因子：
1.8
作者：
P. Galenko;D. Danilov
通讯作者：
P. Galenko;D. Danilov
DOI：
10.1016/s0921-5093(00)01477-5
发表时间：
2001-05
影响因子：
6.4
作者：
A. Mullis;D. J. Walker;S. Battersby;R. Cochrane
通讯作者：
A. Mullis;D. J. Walker;S. Battersby;R. Cochrane
DOI：
10.4028/www.scientific.net/kem.81-83.83
发表时间：
1993-01
期刊：
Key Engineering Materials
影响因子：
--
作者：
D. Herlach
通讯作者：
D. Herlach