Abstract

In this paper, the ballistic performance of AA6061-B₄C surface composite targets fabricated by Friction Stir Processing (FSP) technique has been investigated. The paper is divided into two stages. Stage I identifies the suitable process parameters namely, the rotational speed and feed to produce defect free surface composite targets. Standard tests such as tensile test, microhardness and macroscopic examination are carried on FSPed AA6061-B₄C surface composite to identify the best process parameters. In stage II, ballistic experiments are conducted on FSPed AA6061-B₄C targets for both single and multiple hit conditions. The ballistic performances of the targets are measured in by Depth of Penetration (DoP) method. It is seen that, in both single and multiple impact conditions, radial cracks are observed near the crater region of BM AA6061 targets. Especially in multiple hit, severe cracking occurred around the craters present near the edges of BM AA6061 target. On the other hand, no cracks are observed in FSPed AA6061-B₄C targets after both single and multiple hit conditions. A 13%–20% DoP is observed in FSPed AA6061 target compared to BM target. It is inferred that, improvement in microhardness and frictional characteristics offered by B₄C particles have played a vital role in improving the ballistic performance of FSPed AA6061-B₄C targets.

摘要

本文研究了采用搅拌摩擦加工（FSP）技术制备的AA6061-B _{4 C表面复合靶的弹道性能。}论文分为两个阶段。第一阶段确定合适的工艺参数，即生产无缺陷表面复合靶材的转速和进给量。_{对FSPed AA6061-B 4} C表面复合材料进行拉伸试验、显微硬度和宏观检查等标准测试，以确定最佳工艺参数。_{在第二阶段，弹道实验在 FSPed AA6061-B 4}上进行单次和多次命中条件的 C 目标。目标的弹道性能通过穿透深度（DoP）方法测量。可以看出，在单次和多次冲击条件下，在 BM AA6061 靶材的弹坑区域附近观察到径向裂纹。特别是在多次命中中，在 BM AA6061 靶材边缘附近的弹坑周围出现了严重的裂纹。另一方面，在单次和多次命中条件下， FSPed AA6061-B _{4 C 靶材均未观察到裂纹。}与 BM 目标相比，在 FSPed AA6061 目标中观察到 13%–20% 的 DoP。据推测，B ₄ C颗粒提供的显微硬度和摩擦特性的改善对提高FSPed AA6061-B _{4的弹道性能起到了至关重要的作用}C 目标。