Study on the solidification microstructure in AZ91D Mg alloy after laser surface melting |
| |
Authors: | Y.C. Guan Z.L. Li |
| |
Affiliation: | a Precision Engineering and Nanotechnology Centre, School of Mechanical and Aerospace Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore b Singapore Institute of Manufacturing Technology, 71 Nanyang Drive, Singapore 638075, Singapore |
| |
Abstract: | Laser surface melting (LSM) is known to enhance the wear and corrosion resistance of Mg alloys, but its effect on microstructural evolution of Mg alloys is not well understood. An effort has been made to study the effect of rapid solidification following LSM on the microstructural evolution of AZ91D Mg alloy. The results of X-ray diffractometry, scanning electron microscopy, transmission electron microscopy and energy-dispersive X-ray spectroscopy indicated that the solidification microstructure in the laser-melted zone was mainly cellular/dendrite structure of primarily α-Mg phase and continuous network of β-Mg17Al12 phase. Numerical prediction of the laser-melted zone suggested that cooling rates increased strongly from the bottom to the top surface in the irradiated regions. An attempt has been made to correlate dendrite cell sizes of the solidification microstructure with the cooling rates in the laser-treated AZ91D Mg alloy. |
| |
Keywords: | Magnesium alloy Laser surface melting Rapid solidification Microstructure |
本文献已被 ScienceDirect 等数据库收录! |
|