关于添加式制造的铝硅复合材料共晶变形和断裂的研究

IF 1.8 4区 材料科学 Q2 MATERIALS SCIENCE, CHARACTERIZATION & TESTING
A. V. Zemlyanov, D. D. Gatiyatullina, V. R. Utyaganova, E. Dymnich, N. N. Shamarin, S. Yu. Nikonov, V. A. Romanova, A. S. Kulkov, R. R. Balokhonov
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引用次数: 0

摘要

摘要 对采用线进电子束增材制造技术制造的 AlSi12 合金进行了实验和数值研究,以考察几个微米尺度的共晶微体积的结构、热力学行为和断裂情况。在平面应变条件下求解了动态边界值问题。计算中明确考虑了由铝基体和硅颗粒组成的共晶相的复合结构。在 ABAQUS/Explicit 中实现了热塑基体和弹脆颗粒的各向同性模型。在计算复合材料变形时,既考虑到了复合材料制造后冷却所产生的残余应力,也考虑到了未考虑的残余应力。结果表明,共晶冷却后,硅颗粒受到压缩,铝基体受到体积压应力、拉应力和纯剪应力。研究发现,残余应力在复合材料剧烈变形阶段起着负面作用。共晶的断裂应变在很大程度上取决于基体的屈服点,而极限断裂应力仅略有不同。硅颗粒的良好形态可防止共晶的早期断裂。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

A Study of Deformation and Fracture of the Eutectic in an Additively Manufactured Al-Si Composite Alloy

A Study of Deformation and Fracture of the Eutectic in an Additively Manufactured Al-Si Composite Alloy

Experimental and numerical studies were conducted on AlSi12 alloy fabricated by wire-feed electron beam additive manufacturing to examine the structure, thermomechanical behavior and fracture of a eutectic microvolume at the scale of several microns. Dynamic boundary value problems were solved under plane strain conditions. The composite structure of the eutectic phase consisting of an aluminum matrix and silicon particles was taken into account explicitly in the calculations. Isotropic models of the thermoelastoplastic matrix and elastic-brittle particles were implemented in ABAQUS/Explicit. Composite deformation was calculated both with and without allowance for residual stresses caused by cooling of the composite after its fabrication. It was shown that after the cooling of the eutectic, silicon particles are compressed, and the aluminum matrix is under both bulk compressive and tensile as well as under pure shear stresses. It was found that residual stresses play a negative role at the stages of intense deformation of the composite. The fracture strain of the eutectic strongly depends on the yield point of the matrix, while the ultimate fracture stress varies but only slightly. Favorable morphology of silicon particles was determined which prevents early fracture of the eutectic.

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来源期刊
Physical Mesomechanics
Physical Mesomechanics Materials Science-General Materials Science
CiteScore
3.50
自引率
18.80%
发文量
48
期刊介绍: The journal provides an international medium for the publication of theoretical and experimental studies and reviews related in the physical mesomechanics and also solid-state physics, mechanics, materials science, geodynamics, non-destructive testing and in a large number of other fields where the physical mesomechanics may be used extensively. Papers dealing with the processing, characterization, structure and physical properties and computational aspects of the mesomechanics of heterogeneous media, fracture mesomechanics, physical mesomechanics of materials, mesomechanics applications for geodynamics and tectonics, mesomechanics of smart materials and materials for electronics, non-destructive testing are viewed as suitable for publication.
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