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| 3A21铝合金半固态坯料制备工艺研究 |
| Study of Fabrication of Semi-solid Billet of 3A21 Aluminum Alloy |
| Received:September 10, 2012 Revised:November 10, 2012 |
| DOI： |
| 中文关键词: 半固态 等径角挤压 3A21铝合金 等积圆直径 形状系数 |
| 英文关键词: semi-solid ECAP 3A21 aluminum-alloy equal area circle diameter shape factor |
| 基金项目:安徽省自然科学基金资助项目( 070414148) |
| Author Name | Affiliation | | WANG Xue | School of Materials Science and Engineering, Hefei University of Technology, Hefei, 230009, China | | LI Ping | School of Materials Science and Engineering, Hefei University of Technology, Hefei, 230009, China | | ZHU Guang-yu | School of Materials Science and Engineering, Hefei University of Technology, Hefei, 230009, China |
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| 中文摘要: |
| 以3A21铝合金为研究对象，将等径角挤压工艺与等温处理工艺相结合，从实验角度研究其中的工艺参数对半固态组织尺寸形貌的影响。采用Bc路径进行ECAP 3道次处理，然后在660 ℃下保温20，25，30 min，得到27个试样的半固态组织。结果表明，随着挤压道次的增加，晶粒尺寸减小，变形更加均匀，并且累积变形能的增多，也为后续半固态等温处理提供了更好的应变诱导条件；保温时间越长，半固态组织演化越完全，晶粒球化越完整，但晶粒尺寸会随着保温时间的延长而长大。最后得出最佳工艺参数匹配：室温下沿Bc路径等径角挤压3道次，660 ℃下保温25 min；最终半固态坯料显微组织的平均等积圆直径d=83.7 μm，平均形状系数F-c=0.84。 |
| 英文摘要: |
| Equal channel angular pressing and isothermal treatment were combined and the influence of technological parameters on size and pattern of semi-solid microstructures of 3A21 aluminum alloy was analyzed in the view of experiments. Twenty-seven samples were obtained after 3 passes ECAP under route Bc and 20, 25，30 min holding under the temperature of 660 ℃. The results indicate that, with the increment of ECAP passes, size of gains becomes smaller, deformation of microstructure becomes more uniform, and the more accumulation of deformation energy creates a favorable strain inducement condition for subsequent isothermal treatment in semi-solid state; gains spheroidize better and gain size becomes larger when the heat holding time elongates. In conclusion, the best technology parameters are as follows: ECAP route Bc, 3 passes, holding temperature 660 ℃, holding time 25 min. The average gain size is 83.7 μm, and the average shape factor is 0.84. |
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