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首页> 外文期刊>Materials Science and Engineering >Investigation of strengthening mechanism in Ni-38Cr-3.8Al alloy with fine lamellar structure by in situ neutron diffraction analysis
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Investigation of strengthening mechanism in Ni-38Cr-3.8Al alloy with fine lamellar structure by in situ neutron diffraction analysis

机译：薄层结构Ni-38Cr-3.8Al合金的原位中子衍射研究

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摘要

The strengthening mechanism of Ni-38Cr-3.8Al (mass%) alloy with fine lamellar structure composed of the γ/γ' and α-Cr layers, which is formed by discontinuous precipitation, was examined by in situ neutron diffraction analysis. The contribution of each constituent phase on the deformation behavior could be separated by the in situ analysis. The plastic deformation occurred preferentially in the γ and γ' phases, while the α-Cr phase deformed more elastically even beyond the yield point of the y and γ' phases, which is similar to the cementite in pearlite of a steel. Fine nano-lamellar structure formed by the discontinuous precipitation is found to be mainly responsible for high strength of the alloys, while the influence of the γ' precipitates on strength is likely to be small. Furthermore, the strengths of the a-Cr and y phases in the lamellar structure increased linearly with increasing inverse square root of the width of the a-Cr and the y phases, and therefore, the strengthening mechanism of this alloy is consistent with the Hall-Petch relationship of fine lamellar structure.
机译：通过原位中子衍射分析，研究了由不连续析出形成的由γ/γ'和α-Cr层组成的细小层状结构的Ni-38Cr-3.8Al（质量％）合金的强化机理。每个组成相对变形行为的贡献可以通过原位分析来分离。塑性变形优先发生在γ和γ'相，而α-Cr相甚至在超过y和γ'相的屈服点时发生更弹性的变形，这类似于钢珠光体中的渗碳体。发现由不连续沉淀形成的细微纳米层结构主要负责合金的高强度，而γ'沉淀对强度的影响可能很小。另外，层状组织中的a-Cr和y相的强度随着a-Cr和y相的宽度的平方根的倒数平方增加而线性增加，因此，该合金的强化机理与Hall一致。 -细层状结构的提取关系。

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