| About this Abstract |
| Meeting |
MS&T23: Materials Science & Technology
|
| Symposium
|
Light Metal Technology
|
| Presentation Title |
Improved Strength in Mg-Al Dissimilar Impact Welding by Surface Nanocrystallization of Mg Alloy Sheet |
| Author(s) |
Jianyue Zhang, Jianxiong Li, Jiashi Mao, Yu Mao, Xuejun Huang, Anupam Vivek, Glenn Daehn, Alan Luo |
| On-Site Speaker (Planned) |
Jianyue Zhang |
| Abstract Scope |
A nanocrystalline was fabricated on the surface of Mg alloy and the role of nanocrystalline on the Magnesium(Mg)-Aluminum(Al) dissimilar Vaporizing Foil Actuator Welding (VFAW) solid-state welding was investigated. The welding spot presented a wavy interface with melting and crack in as-received Mg-Al welding. After nanocrystalline, the welding interface showed a smaller wave and no melting and cracks found at the interface. From the chisel test, the welding strength was improved from 1350N to 2100N after placing Mg nanocrystalline. Amorphous zones were found at the interface without nanocrystalline by Transmission electron microscopy (TEM). However, at the interface with nanocrystalline, it demonstrated a diffusion zone of Al into Mg. During welding, the nanocrystalline acted as a fast diffusion path to promote the diffusion from Al into Mg. Meanwhile, the hardened surface after nanocrystallization resisted wave formation and reduced heat formation, thus avoided interface melting and cracking. |