Stress-enhanced grain growth in a nanostructured aluminium alloy during spark plasma sintering |
| |
| Authors: | Dongming Liu Haiming Wen Dalong Zhang Chuanxin Wang Yaojun Lin Yuhong Xiong |
| |
| Institution: | 1. Key Laboratory for Liquid–Solid Structural Evolution and Processing of Materials, Ministry of Education, Shandong University, Jinan 250061, Chinadongmingliu@sdu.edu.cn;3. Department of Chemical Engineering and Materials Science, University of California, Davis, CA 95616, USA;4. Key Laboratory for Liquid–Solid Structural Evolution and Processing of Materials, Ministry of Education, Shandong University, Jinan 250061, China;5. State Key Laboratory of Metastable Materials Science and Technology and College of Materials Science and Engineering, Yanshan University, Qinhuangdao, Hebei 066004, China |
| |
| Abstract: | In this study, we report on the influence of high pressure on the microstructure evolution of cryomilled nanostructured Al alloy powders during spark plasma sintering (SPS). Our experimental results suggest that the particular mechanism that governs grain growth during SPS depends on the magnitude of the applied pressure. In the case of material consolidated at a high pressure (e.g. 500 MPa), grain coarsening occurs via a combination of thermally activated grain boundary (GB) migration, stress-coupled GB migration and grain rotation-induced grain coalescence. In contrast, in the case of the material consolidated at a low pressure (50 MPa), grain growth occurs primarily via thermally activated GB migration. |
| |
| Keywords: | aluminium alloy nanostructured materials spark plasma sintering grain growth mechanism high pressure |
|
|
