Kinetics and microstructural evolution during recrystallization of a single crystal superalloy

Kinetics and microstructural evolution during recrystallization of a single crystal superalloy
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单晶高温合金再结晶过程中的动力学和微观结构演变

DOI:
10.1016/j.matchar.2015.07.027
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发表时间:
2015-10
影响因子:
4.7
通讯作者:
Longchao Zhuo, Shuhua Liang, Feng Wang, Tao Xu, Yanlin Wan
Longchao Zhuo, Shuhua Liang, Feng Wang, Tao Xu, Yanlin Wan
中科院分区:
材料科学1区
文献类型:
--
作者:
Longchao Zhuo, Shuhua Liang, Feng Wang, Tao Xu, Yanlin Wan

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采用模型模拟、透射电镜和电子背散射衍射相结合的方法,研究了第二代单晶高温合金在1100-1200 °C和0.5 ~ 16 h退火温度范围内的再结晶动力学行为。Johnson-Mehl-Avrami方程和Arrhenius方程所代表的动力学揭示了其复杂的扩散控制机制。随着退火温度和退火时间的增加,再结晶晶粒尺寸呈稳定增大的趋势,原始基体中的亚晶界逐渐被大角度晶界所取代,导致Schmid因子的提高。孪晶在变形组织中占主导地位,表明孪晶在应变能耗散中起着重要作用,促进了再结晶的完全进行。
The kinetical recrystallization behaviors over wide ranges of annealing temperature of 1100–1200 °C and annealing time range of 0.5–16 h of a second-generation single-crystal superalloy have been investigated by combined model simulation, TEM and EBSD techniques. The kinetics represented by Johnson–Mehl–Avrami and Arrhenius equations revealed its complicated diffusion-controlled mechanism. With increasing annealing temperature and time, the recrystallized grain size exhibited a steady increasing tendency, and gradually, the subgrain boundaries in the original matrix were consumed and replaced by high angle grain boundaries, leading to improved Schmid factor. The dominant fraction of twins in the resultant microstructure indicated its significant role in strain energy dissipation, facilitating the complete progress of recrystallization.
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