Microscopic grinding mechanism of γ/γ’ single crystals

IF 2.5 4区 材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY Applied Physics A Pub Date : 2025-01-20 DOI:10.1007/s00339-025-08242-2
Wenzhang Xu, Jiachun Li, Fang Yu, Yongtao Wang
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Abstract

High-precision Ni-based alloy components are widely used in aerospace and other advanced applications. However, when machining accuracy reaches the micrometer scale or higher, the microstructure of the material must be considered. To uncover its microscopic grinding mechanisms, we employed molecular dynamics to study the grinding behavior of the alloy and its constituent phases. The results indicate that, compared to the γ single crystal (SC), the γ’ single crystal (SC) exhibits enhanced interatomic bonding due to the incorporation of Al atoms. Consequently, it experiences the highest subsurface residual stress and grinding temperature, leading to poorer grinding performance. Furthermore, under external forces, its activated slip surfaces are fewer, and the motion of dislocations is more restricted. In contrast, the two-phase γ/γ’ Ni-based SC combines the properties of both phases, demonstrating superior grinding performance. The presence of grain boundaries further impedes dislocation motion and leads to properties distinct from those of its constituent SCs.

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γ/γ′单晶微观磨削机理
高精度镍基合金部件广泛应用于航空航天和其他先进应用领域。然而,当加工精度达到微米级或更高时,必须考虑材料的微观结构。为了揭示其微观磨削机理,我们采用分子动力学方法研究了该合金及其组成相的磨削行为。结果表明,与γ单晶(SC)相比,由于Al原子的掺入,γ单晶(SC)表现出更强的原子间键合。因此,它的地下残余应力和磨削温度最高,导致磨削性能较差。此外,在外力作用下,其激活滑移面较少,位错的运动受到更大的限制。相比之下,两相γ/γ′ni基SC结合了两相的性能,表现出优异的磨削性能。晶界的存在进一步阻碍了位错的运动,并导致了与其组成的sc不同的性能。
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来源期刊
Applied Physics A
Applied Physics A 工程技术-材料科学:综合
CiteScore
4.80
自引率
7.40%
发文量
964
审稿时长
38 days
期刊介绍: Applied Physics A publishes experimental and theoretical investigations in applied physics as regular articles, rapid communications, and invited papers. The distinguished 30-member Board of Editors reflects the interdisciplinary approach of the journal and ensures the highest quality of peer review.
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