Hot Workability of Ultrafine-Grained Aluminum Alloy Produced by Severe Plastic Deformation of AI6063 Powder and Consolidation
A16063 powder was subjected to severe plastic deformation via high-energy mechanical milling to prepare ultrafine-grained (UFG) aluminium alloy. Uniaxial compression test at various temperatures between 300 and 450 ℃ and strain rates between 0.01 and 1 s1 was carried out to evaluate hot workability of the material. Microstructural studies were performed by EBSD and TEM. The average activation energy and strain rate sensitivity of the hot deformation process were determined to be 280 kJ mol-1 and 0.05, respectively. The deformation temperature and applied strain rate significantly affected the grain structure of UFG Al alloy. A finer grain structure was obtained at lower temperatures and higher strain rates. The formation of highly misoriented and equiaxed grains also revealed that dynamic recrystallization occurred upon hot deformation. Furthermore, elongated grains with high dislocation density were observed that disclosed partial dynamic recrystallization of the aluminum matrix.
Hamed Asgharzadeh Abdolreza Simchi Hyoung Seop Kim
Department of Materials Science and Engineering,Sharif University of Technology,P.O.Box 11365-9466,T Institute for Nanoscience and Nanotechnology,Sharif University of Technology,P.O.Box 11365-9466,Tehr Department of Materials Science and Engineering,Pohang University of Science and Technology,P.O.Box.
国际会议
5th International Conference on Nanomaterials by Severe Plastic Deformation(第五届剧烈塑性变形纳米材料国际会议)
南京
英文
979-984
2011-03-01（万方平台首次上网日期，不代表论文的发表时间）