Friction self-piercing riveting (F-SPR) of aluminum alloy to magnesium alloy using a flat die
| Autor: | Yongbing Li, He Shan, Yunwu Ma, Sizhe Niu, Bingxin Yang |
|---|---|
| Rok vydání: | 2022 |
| Předmět: |
010302 applied physics
business.product_category Materials science Alloy Metals and Alloys Intermetallic chemistry.chemical_element 02 engineering and technology engineering.material 021001 nanoscience & nanotechnology 01 natural sciences Upset Coping (joinery) chemistry Mechanics of Materials Aluminium 0103 physical sciences engineering Rivet Die (manufacturing) Composite material Magnesium alloy 0210 nano-technology business |
| Zdroj: | Journal of Magnesium and Alloys. 10:1207-1219 |
| ISSN: | 2213-9567 |
| Popis: | Friction self-piercing riveting (F-SPR) process based on a pip die has been invented to solve the cracking problems in riveting high-strength and low-ductility light metals, such as magnesium alloys, cast aluminum, and 7 series aluminum alloys. In this paper, in order to solve quality issues caused by the misalignment between rivet and pip-die in F-SPR, a flat-die based F-SPR process was proposed and employed to join 1.27 mm-thick AA6061-T6 to 3 mm-thick AZ31B. The results indicate that a 1.0 mm die distance is effective to avoid rivet upset and insufficient flaring. As the feed rate increases, the heat input in the whole process decreases, resulting in a larger riveting force, which in turn increases both the bottom thickness and interlock amount. Besides, solid-state bonding, including Al-Mg intermetallic compounds (IMCs), Al-Mg mechanical mixture, and Al-Fe atom interdiffusion was observed at the joint interfaces. The upper Al layer was softened, but the lower Mg layer was hardened, and both sheets exhibited a narrowed affected region with the increase of feed rate, while the rivet hardness shows no obvious change. Three fracture modes appeared accompanying the variations in lap-shear strength and energy absorption as the feed rate increased from 2 mm/s to 8 mm/s. Finally, the F-SPR process using a flat die was compared to those using a pip die and a flat bottom die to show the advantage of flat die on coping with the misalignment problem. |
| Databáze: | OpenAIRE |
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