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Grain refinement of non-equiatomic Cr-rich CoCrFeMnNi high-entropy alloys through combination of cold rolling and precipitation of σ phase
Materials Science and Engineering: A ( IF 6.4 ) Pub Date : 2018-08-13 , DOI: 10.1016/j.msea.2018.08.038
Ken Cho , Yumi Fujioka , Takeshi Nagase , Hiroyuki Y. Yasuda

Grain refinement of non-equiatomic Cr-rich CoCrFeMnNi high-entropy alloys with an fcc structure was studied focusing on the precipitation of a Cr-rich σ phase along grain boundaries and shear bands. We found for the first time that the σ phase can be precipitated at the grain boundaries and the shear bands in the alloys at a significantly fast precipitation rate. The σ phase effectively suppressed the grain growth of the fcc matrix during recrystallization of the alloy after conventional cold rolling, resulting in a fine-grained microstructure with a mean diameter of approximately 1 µm. The alloys with this fine microstructure containing the σ phase exhibit high strength over a wide temperature range due to grain boundary strengthening and precipitation strengthening caused by the σ phase. Moreover, the alloys exhibit large ductility not only at room and high temperatures, but also at low temperatures. Deformation-induced twinning plays an important role in this ductility.



中文翻译:

冷轧和σ相析出相结合的非等原子富Cr CoCrFeMnNi高熵合金的晶粒细化

研究了一种具有fcc结构的非等原子富Cr的CoCrFeMnNi高熵合金的晶粒细化,重点研究了富Crσ相沿晶界和剪切带的析出。我们首次发现σ相可以以非常快的析出速度在合金的晶界和剪切带上析出。σ相有效地抑制了常规冷轧后合金再结晶过程中fcc基体的晶粒长大,从而形成了平均直径约为1 µm的细晶粒组织。具有这种细微组织的含有σ相的合金,由于由σ相引起的晶界强化和析出强化,在较宽的温度范围内均显示出高强度。而且,该合金不仅在室温和高温下,而且在低温下也显示出较大的延展性。变形引起的孪晶在这种延展性中起重要作用。

更新日期:2018-08-13
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