Microstructural coarsening of 6061 aluminum alloy semi-solid billets prepared via recrystallization and partial melting
Microstructural coarsening of 6061 aluminum alloy semi-solid billets prepared via recrystallization and partial melting
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再结晶和部分熔化制备6061铝合金半固态坯料的显微组织粗化
DOI：
10.1007/s12206-017-0737-5
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发表时间：
2017-08-01
影响因子：
1.6
通讯作者：
Zhao, Yongqiang
中科院分区：
文献类型：
--
作者：
Wang, Yongfei;Zhao, Shengdun;Zhao, Yongqiang
采用再结晶和部分熔融（RAP）工艺制备6061铝合金半固态方坯。研究了材料的组织演变和粗化过程。在RAP过程中，将以冷轧状态供应的6061铝合金板加热至半固态范围。结果表明：固体晶粒的平均晶粒尺寸和形状因子随等温保温时间和保温温度的增加而增大；固相晶粒的粗化可归因于聚结和奥斯特瓦尔德成熟机制，随着等温保温时间和温度的增加，奥斯特瓦尔德成熟机制的作用越来越大。在等温保温温度为620、625、630和635℃时，粗化速率常数分别为333.1、833.8、1034.7和1271.9 μm/s3。随着等温保温温度的升高，粗化速率常数逐渐增大。
In this study, the Recrystallization and partial melting (RAP) process was performed to prepare 6061 aluminum alloy semi-solid billets. The microstructural evolution and coarsening of the materials were investigated. During the RAP process, the 6061 aluminum alloy plate supplied in cold rolled state was heated to the semi-solid range. The results showed that both the average grain size and shape factor of solid grains increased along with the isothermal holding time and temperature. The coarsening of solid grains could be attributed to the coalescence and Ostwald ripening mechanisms, with the latter playing an increasingly important role as the isothermal holding time and temperature increased. At isothermal holding temperatures of 620, 625, 630 and 635 °C, the coarsening rate constants reached 333.1, 833.8, 1034.7 and 1271.9 μm/s3, respectively. Moreover, the coarsening rate constant gradually increased along with isothermal holding temperature.