Effect of creep-aging on precipitates of 7075 aluminum alloy
Effect of creep-aging on precipitates of 7075 aluminum alloy
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DOI：
10.1016/j.msea.2013.09.045
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发表时间：
2013-12
期刊：
影响因子：
6.4
通讯作者：
Y. Lin;Yu-Qiang Jiang;Xiao-Min Chen;D. Wen;Hua-Min Zhou
中科院分区：
文献类型：
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作者：
Y. Lin;Yu-Qiang Jiang;Xiao-Min Chen;D. Wen;Hua-Min Zhou
通过高温下单轴拉伸蠕变实验研究了7075铝合金的蠕变时效行为。利用扫描电子显微镜（SEM）和透射电子显微镜（TEM）研究了蠕变时效温度和外加应力对7075-T651铝合金析出相的影响。结果表明:(1)铝基体中存在粗大不溶析出物(Al 7 Cu 2 Fe和Mg 2 Si)和中间析出物(Al 18 Mg 3 Cr 2 和Al 3 Zr),蠕变时效处理对这些析出物的影响不明显;(2)时效析出物主要为η′和η相,时效析出物数量随着 (3)随着蠕变时效温度和外加应力的升高,析出物在晶界上不连续分布,无析出区宽度随着蠕变时效温度和外加应力的增加而增大;(4)与传统无应力时效试样的显微组织相比,蠕变时效过程可以细化析出物,缩小无析出区的宽度。
The creep-aging behaviors of 7075 aluminum alloy are studied by uniaxial tensile creep experiments under elevated temperatures. The effects of creep-aging temperature and applied stress on the precipitates of 7075-T651 aluminum alloy are investigated using a scanning electron microscope (SEM) and a transmission electron microscope (TEM). Results show that (1) coarse insoluble precipitates (Al 7 Cu 2 Fe and Mg 2 Si) and intermediate precipitates (Al 18 Mg 3 Cr 2 and Al 3 Zr) are found in the aluminum matrix, and the effects of creep-aging treatment on these precipitates are not obvious;(2) the main aging precipitates are η′ and η phases, and the amount of aging precipitates increase with the increase of creep-aging temperature and applied stress;(3) with the increase of creep-aging temperature and applied stress, the precipitates are discontinuously distributed on the grain boundary, and the width of precipitate free zone increases with the increase of creep-aging temperature and applied stress and (4) compared with the microstructure in the traditional stress-free aged sample, the creep-aging process can refine the precipitates and narrow the width of the precipitate free zone.