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首页> 外文期刊>Materials Science and Engineering >Grain refinement of non-equiatomic Cr-rich CoCrFeMnNi high-entropy alloys through combination of cold rolling and precipitation of a phase
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Grain refinement of non-equiatomic Cr-rich CoCrFeMnNi high-entropy alloys through combination of cold rolling and precipitation of a phase

机译：通过冷轧和析出相的结合，对非等原子富Cr CoCrFeMnNi高熵合金进行晶粒细化

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摘要

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 a phase along grain boundaries and shear bands. We found for the first time that the a phase can be precipitated at the grain boundaries and the shear bands in the alloys at a significantly fast precipitation rate. The a 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 mu m. The alloys with this fine microstructure containing the a phase exhibit high strength over a wide temperature range due to grain boundary strengthening and precipitation strengthening caused by the a 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.
机译：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，重点是沿着晶界和剪切带的富Cr相的析出。我们首次发现a相可以以显着快速的析出速率在合金的晶界和剪切带上析出。 a相有效地抑制了常规冷轧后合金在重结晶过程中fcc基体的晶粒长大，从而形成了平均直径约为1微米的细晶粒组织。具有细微结构的含a相的合金，由于a相引起的晶界强化和析出强化，在宽温度范围内均显示出高强度。此外，该合金不仅在室温和高温下，而且在低温下也显示出大的延展性。变形引起的孪晶在这种延展性中起重要作用。

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