Quantitative analysis of texture evolution of cold-rolled direct-chill-cast and continuous-cast AA5052 and AA5182 aluminum alloys during isothermal annealing
Quantitative analysis of texture evolution of cold-rolled direct-chill-cast and continuous-cast AA5052 and AA5182 aluminum alloys during isothermal annealing
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DOI：
10.1007/s11661-004-0197-2
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发表时间：
2004-11
期刊：
影响因子：
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通讯作者：
Y. M. Zhao;W. C. Liu;J. Morris
中科院分区：
文献类型：
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作者：
Y. M. Zhao;W. C. Liu;J. Morris
将直接激冷铸造（DC）和连续铸造（CC）的原样AA 5052和AA 5182热轧带在454 °C下预热4小时，然后冷轧至厚度减少80%。用X射线衍射研究了这些冷轧样品在等温退火过程中的织构演变。利用Johnson-Mehl-Avrami-Kolmogorov（JMAK）方程定量分析了织构体积分数随退火时间的变化。比较了AA 5052和AA 5182合金以及DC和CC合金再结晶织构的差异。结果表明，对于DC和CC材料，AA 5052合金具有比AA 5182合金更强的立方再结晶织构。退火温度对AA 5182合金的再结晶织构有很大影响。随着退火温度的升高，立方再结晶织构增强，而R织构减弱。退火温度对AA 5052合金的再结晶织构影响不大。DC AA 5052和5182合金也表现出比相应的CC合金更强的立方再结晶织构。对于DC和CC AA 5052合金，JMAK型方程中的t值随退火温度的升高而增大，而对于DC和CC AA 5182合金，t值仅随退火温度略有变化。
The as-received direct-chill-cast (DC) and continuous-cast (CC) AA5052 and AA5182 hot bands were preheated at 454 °C for 4 hours, followed by cold rolling to an 80 pct reduction in thickness. The texture evolution of these cold-rolled samples during isothermal annealing was investigated by X-ray diffraction. The variation in texture volume fractions with annealing time was quantitatively analyzed by using the Johnson-Mehl-Avrami-Kolmogorov (JMAK) equation. The differences in recrystallization textures between the AA5052 and AA5182 alloys and between the DC and CC alloys were compared. It was found that the AA5052 alloy possessed a stronger cube recrystallization texture than the AA5182 alloy for the DC and CC materials. The recrystallization textures of the AA5182 alloy were affected strongly by the annealing temperature. As the annealing temperature increased, the cube recrystallization texture strengthened, whereas the R texture weakened. The annealing temperature had little influence on the recrystallization textures of the AA5052 alloy. The DC AA5052 and 5182 alloys also exhibited stronger cube recrystallization textures than the corresponding CC alloys. For the DC and CC AA5052 alloys, thenvalue in the JMAK-type equation increased with an increase in the annealing temperature, while thenvalues varied only slightly with the annealing temperature for the DC and CC AA5182 alloys.