使用全景图像分析确定金属间 Mg-Al-Ca 复合材料在高温下损伤形成的速率依赖性,Advanced Engineering Materials

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使用全景图像分析确定金属间 Mg-Al-Ca 复合材料在高温下损伤形成的速率依赖性
Advanced Engineering Materials ( IF 3.4 ) Pub Date : 2023-09-01 , DOI: 10.1002/adem.202300956
Setareh Medghalchi ₁ , Muhammad Zubair _{1,

2} , Ehsan Karimi ₁ , Stefanie Sandlöbes-Haut ₁ , Ulrich Kerzel ₃ , Sandra Korte-Kerzel ₁

Affiliation

研究了一种铸造 Mg-4.65Al-2.82Ca 合金，其微观结构含有 α-Mg 基体，并用 C36 Laves 相骨架强化。这种三元合金具有优异的蠕变性能，适用于汽车发动机的高温应用。然而，在应用中，合金可能会受到各种应变率的影响，因此加速测试通常是必要的。因此，了解此类利率变化的影响至关重要。这里重点关注它们对损伤形成的影响。该分析基于使用扫描电子显微镜的高分辨率全景成像，并结合使用深度学习进行对象检测和分类（YOLOv5）的自动损伤分析。研究发现，随着应变率的降低，给定应变水平的主要损伤机制发生变化：在5 × 10 -4 ^s -1^的应变率下，C36 Laves 相中微裂纹的演化主导了损伤的形成。然而，当应变速率降低至5 × 10 ^-6 s ^-1时，界面脱聚变得同样重要。还观察到裂纹方向的变化，表明 α-Mg 基体和 Laves 相的塑性共同形成的影响越来越大。这种转变归因于界面热激活过程的主要损伤机制。

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Determination of the Rate Dependence of Damage Formation in Metallic-Intermetallic Mg–Al–Ca Composites at Elevated Temperature using Panoramic Image Analysis

A cast Mg-4.65Al-2.82Ca alloy with a microstructure containing an α-Mg matrix is studied, which is reinforced with a C36 Laves phase skeleton. Such ternary alloys are targeted for elevated temperature applications in automotive engines, since they possess excellent creep properties. However, in application, the alloy may be subjected to a wide range of strain rates, and thus accelerated testing is often essential. It is, therefore, crucial to understand the effect of such rate variations. Herein, their impact on damage formation is focused. The analysis is based on high-resolution panoramic imaging using scanning electron microscopy, combined with automated damage analysis using deep learning for object detection and classification (YOLOv5). It is found that with decreasing strain rate the dominant damage mechanism for a given strain level changes: at a strain rate of 5 × 10⁻⁴ s⁻¹, the evolution of microcracks in the C36 Laves phase dominates damage formation. However, when the strain rate is decreased to 5 × 10⁻⁶ s⁻¹, interface decohesion, becomes equally important. A change in crack orientation is also observed, indicating an increasing influence of plastic codeformation of the α-Mg matrix and Laves phase. This transition is attributed to the leading damage mechanism to thermally activated processes at the interface.

更新日期：2023-09-01

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