Evolution of the microstructure and hardness of a rapidly solidified/melt-spun AZ91 alloy upon aging at different temperatures |
| |
| Authors: | Baishu Wang Yongbing Liu Jian An Rongguang Li Zhenguo Su Guihua Su You Lu Zhanyi Cao |
| |
| Affiliation: | 1. Key Laboratory of Automobile Materials, Ministry of Education, Department of Materials Science and Engineering, Jilin University, 5988 Renmin Street, Changchun 130025, PR China;2. Department of Materials Science and Engineering, Changchun University of Technology, 17 Yan''an Street, Changchun 130012, PR China |
| |
| Abstract: | The effect of aging at different temperatures on a rapidly solidified/melt-spun AZ91 alloy has been investigated in depth. The microstructures of as-spun and aged ribbons with a thickness of approximately 60 µm were characterized using X-ray diffraction, transmission electron microscopy and laser optical microscopy; microhardness measurements were also conducted. It was found that the commercial AZ91 alloy undergoes a cellular/dendritic transition during melt-spinning at a speed of 34 m/s. A strengthening effect due to aging was observed: a maximum hardness of 110 HV/0.05 and an age-hardenability of 50% were obtained when the ribbon was aged at 200 °C for 20 min. The β-Mg17Al12 phase exhibits net and dispersion types of distribution during precipitation. The dispersion of precipitates in dendritic grains or cells is the main source of strengthening. |
| |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
