Microstructural evolution of a CoCrFeMnNi high-entropy alloy after swaging and annealing
Microstructural evolution of a CoCrFeMnNi high-entropy alloy after swaging and annealing
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DOI：
10.1016/j.jallcom.2015.05.129
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发表时间：
2015-10-25
影响因子：
6.2
通讯作者：
George, E. P.
中科院分区：
文献类型：
--
作者：
Laplanche, G.;Horst, O.;George, E. P.
在等原子单相CoCrFeMnNi高熵合金中研究了旋转旋锻和随后的热处理过程中控制显微组织和织构演变的工艺参数。在真空感应熔炼和铸造之后，在室温下通过旋锻（直径减小60%/面积减小80%）将40 mm铸锭的直径减小到16.5 mm的最终直径，然后将合金在不同温度下退火1小时。使用扫描电子显微镜，能量色散X射线光谱，电子背散射衍射和显微硬度测量的结果进行了分析。结果发现，显微硬度首先略有增加，退火低于再结晶温度，但然后急剧下降，在较高的退火温度下，由于再结晶的发病。特别强调的是如何微观结构演变相对于径向和纵向位置的杆。最后，结合锻造和热处理参数确定，可以产生CoCrFeMnNi高熵合金具有均匀的成分和晶粒尺寸，几乎没有纹理。(C)2015年由Elsevier B. V.出版
The processing parameters which govern the evolution of microstructure and texture during rotary swaging and subsequent heat treatments were studied in an equiatomic single-phase CoCrFeMnNi high-entropy alloy. After vacuum induction melting and casting, the diameter of the 40 mm cast ingot was reduced at room temperature to a final diameter of 16.5 mm by rotary swaging (diameter reduction of 60%/area reduction of 80%) and the alloy was then annealed at different temperatures for 1 h. The resulting microstructures were analyzed using scanning electron microscopy, energy-dispersive X-ray spectroscopy, electron backscatter diffraction and correlated with results of microhardness measurements. It was found that the microhardness first increases slightly upon annealing below the recrystallization temperature but then drops steeply at higher annealing temperatures due to the onset of recrystallization. Special emphasis was placed on how the microstructure evolves with respect to the radial and longitudinal position in the rod. Finally, a combination of swaging and heat treatment parameters were identified that can produce CoCrFeMnNi high-entropy alloys with a homogeneous composition and grain size and almost no texture. (C) 2015 Published by Elsevier B.V.