李雄 张小阳 贺庆辉 黄美雪 唐岱 银如平 邵攀峰

摘要：随着轻量化技术的发展，诸如铝镁合金等轻质金属得以广泛应用，而铆接作为制作异种轻质金属结构件的主要连接方式，研究其疲劳性能具有重要的现实意义。本文首先介绍了AM60和AZ31镁合金铆接接头的成形过程，并制作了铆接接头实验样件。通过光学显微镜观察了铆接接头微观形貌，并通过扫描电镜分别观察了AM60和AZ31镁合金微观结构。同时，开展了AM60和AZ31镁合金铆接接头单调拉压力学实验和疲劳力学实验。本文的研究有助于开展铆接接头结构件抗疲劳设计，具有广泛的应用价值。

Abstract： With the development of lightweight technology， the light metal like Aluminum and Magnesium alloy is widely used. The riveted joint is considered as the main connection type for this light metal， and so it is helpful to research on the fatigue performance for the dissimilar lightweight metal riveted joints. In this paper， the manufacturing process for AM60 and AZ31 Magnesium alloy was introduced firstly， and the specimens were made as well. The micro morphology of riveted joint was observed by the optical microscope， and the micro-structure of both parental metals was also measured by the scanning electron microscope. Then， the dissimilar lightweight metal riveted joints were conducted on the monotonic tension and compression test， as well as fatigue tests. This work would help the anti-fatigue design of structure made by the riveted joints， and has wide application value.

关键词：镁合金;铆接接头;疲劳;微结构

Key words： magnesium alloy;riveted joints;fatigue;micro-structure

中图分类号：U465                                        文獻标识码：A                                文章编号：1674-957X（2021）01-0096-02

0  引言

随着轻量化技术的发展，铝镁合金等轻质金属得到广泛的应用和推广。而铆接具有加工效率高、强度高等优点，已成为镁合金材料连接首选的加工方式。然而，铆接接头在成型过程中需要迫使母材发生塑性变形，甚至穿破母材，而这势必给铆接接头的服役寿命造成巨大的影响，因此，通过实验研究探明异种轻质金属铆接接头疲劳力学性能具有重要的工程意义。

铆接接头在冷成形过程中会促使母材发生塑性变形，这种变形会使得材料的微观组织形态、力学性能和疲劳性能发生变化。孟鹤等人[3]通过扫描电镜观测发现：铆钉钉体的断口以宏观脆性的微孔型断裂为主，铆体部分断口部分表现出来的特征为典型的宏观塑性的微孔型断裂，并通过能谱分析印证了钉体及铆体的材料特征。……