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首页> 外文会议>2003 International Thermal Spray Conference Vol.1; May 5-8, 2003; Orlando, Florida, USA >Fatigue and Fracture Resistance of Nanostructured Composite System: Chrome Carbide - Hard Oxide Aluminum - Aluminum
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Fatigue and Fracture Resistance of Nanostructured Composite System: Chrome Carbide - Hard Oxide Aluminum - Aluminum

机译：纳米结构复合系统的疲劳强度和断裂强度：碳化铬-硬氧化物铝-铝

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In this paper Al-Al_2O_3-CrC nanostructured composite coating was presented, fatigue and fracture of the composite coating were investigated by nanoindentation, and in situ experiments performed in a scanning electron microscope to permit examination of freshly exposed surfaces. Crystallographic and morphological texture was characterized and the fracture resistance measured using fracture-mechanics. A CrC layer may improve the fracture resistance of an oxide aluminum layer. A CrC layer produced by pyrolitic deposition effectively heals the pores and defects of an oxide aluminum layer. It results in high load rating of the coating. Experiments revealed that in all cases, detection of an acoustic signal corresponded to an appearance of circular cracks seen on the surface; in a very few cases, examination of the surface after detection of a signal revealed the presence of two ring cracks. The degree of toughening associated with crack healing is determined by the number of healed defects and the effectiveness of the individual healing. Macroscopically, a crack path in the oxide aluminum appears to be straight, propagating along pores and internal voids. However, microscopically, a crack path exhibits a high degree of intergranular fracture. Because cracks generally deflect at small angles in the oxide aluminum layer, a crack path moves through pores and internal voids that usually concentrate internal stresses. The crack path is primarily intergranular at all velocities.
机译：本文介绍了Al-Al_2O_3-CrC纳米结构复合涂层，通过纳米压痕研究了复合涂层的疲劳和断裂，并在扫描电子显微镜中进行了原位实验以检查新暴露的表面。表征晶体学和形态织构，并使用断裂力学测量抗断裂性。 CrC层可以改善铝氧化物层的抗断裂性。通过热解沉积产生的CrC层可有效修复氧化铝层的孔和缺陷。这导致涂层的高额定载荷。实验表明，在所有情况下，对声音信号的检测都与表面上看到的圆形裂纹的出现相对应。在极少数情况下，检测到信号后对表面进行检查，发现存在两个环裂纹。与裂纹愈合相关的增韧程度取决于已修复缺陷的数量和单个愈合的有效性。宏观上，氧化铝中的裂纹路径看起来是笔直的，沿着孔和内部空隙传播。然而，在微观上，裂纹路径表现出高度的晶间断裂。由于裂纹通常会在氧化铝层中以小角度偏转，因此裂纹路径会通过孔和内部空隙移动，这些孔和内部空隙通常会集中内部应力。裂纹路径在所有速度下主要是晶间的。

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