A critical study of the erosion of an aluminium alloy by solid spherical particles at normal impingement
A critical study of the erosion of an aluminium alloy by solid spherical particles at normal impingement
复制标题
正常冲击下固体球形颗粒对铝合金侵蚀的关键研究
DOI：
10.1016/0043-1648(83)90302-2
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发表时间：
1983
期刊：
影响因子：
5
通讯作者：
I. Hutchings
中科院分区：
文献类型：
--
作者：
A. Cousens;I. Hutchings
本文报道了球形颗粒正入射侵蚀铝合金中材料去除机制的详细观察。侵蚀样品通过扫描电子显微镜进行检查，并切片进行金相检查。观察到的重要特征包括均匀波长的表面波纹和表面上血小板的形成。在所检查的每个表面下方都有一层，与大块材料清晰地描绘出轮廓，其硬度大约是大块材料的四倍。该层具有层状结构，并包含许多嵌入的侵蚀颗粒碎片。该层的厚度相对均匀，并且由于散装材料渗透到表面而在一些地方穿孔。将标记放置在样本表面下方；在不同侵蚀阶段对标本进行切片后，标记的移动和变形使以下侵蚀机制得以识别。在侵蚀的早期阶段，在建立线性侵蚀速率之前，地下微观结构已形成。然后，通过类似于向后挤压的过程，散装材料通过硬层中的裂缝被迫到达表面。层中的断裂与表面形貌的峰重合。较软的材料通过随后的颗粒冲击被打成片状，并且这些片状的分离导致磨损。
Detailed observations of the mechanism of material removal in aluminium alloys eroded at normal incidence by spherical particles are reported in this paper.Eroded specimens were examined by scanning electron microscopy and were sectioned for metallographic examination. Important features observed included surface ripples of uniform wavelength and the formation of platelets on the surface. Beneath each surface examined was a layer, clearly delineated from the bulk material, with approximately four times the hardness of the bulk. This layer had a laminar structure and contained numerous embedded fragments of erodent particles. The layer was of relatively uniform thickness and was perforated in places by bulk material penetrating to the surface. Markers were placed beneath the surface of the specimens; after the specimens had been sectioned at different stages of erosion, the movement and distortion of the markers enabled the following mechanism of erosion to be identified.In the early stages of erosion, before a linear erosion rate is established, the subsurface microstructure is developed. Then, by a process akin to backward extrusion, bulk material is forced to the surface through fissures in the hard layer. The breaks in the layer coincide with peaks in the surface topography. The softer material is beaten into platelets by subsequent particle impacts, and wear results from the detachment of these platelets.