材料期刊网

Study on the hot deformation behavior of Al-Zn-Mg-Cu-Cr aluminum alloy during multi-stage hot compression

Gaoyong LIN , Xiaoyan ZHENG , Wei YANG , Di FENG , Dashu PENG

金属学报(英文版) doi:10.1016/S1006-7191(08)60077-0

The mechanical behavior and microstructures of an Al-Zn-Mg-Cu-Cr aluminum alloy during multi-stage hot deformation were investigated by thermal stimulation test, optical microscopy, and transmission electron microscopy. The true stress vs true strain curves and the microstructure evolution of two hot deformation procedures were gained. The flow stress of the alloy studied decreases with increasing the deforming passes and declining the temperature, and the larger the temperature decline between adjacent stages, the larger the peak stress fall is. The stress-strain behavior mainly result from the dynamic recovery during deformation, the static recovery and re-crystallization in the delay time, and the second phases precipitated from the matrix at high temperature.

关键词: Al-Zn-Mg-Cu-Cr alloy , null , null , null

Study on the hot deformation behavior of Al-Zn-Mg-Cu-Craluminum alloy during multi-stage hot compression

金属学报(英文版) doi:10.1016/S1006-7191(08)60077-0

关键词:

淬火速率对Al-Zn-Mg-Cu-Cr合金挤压棒材组织及硬度的影响

韩素琦 , 刘胜胆 , 李承波 , 雷越 , 邓运来 , 张新明

材料工程 doi:10.11868/j.issn.1001-4381.2015.000502

通过硬度测试、扫描电镜、透射电镜研究淬火速率对Al-Zn-Mg-Cu-Cr合金挤压棒材组织及硬度的影响.结果表明:淬火速率低于100℃/s时,硬度开始明显下降;2℃/s淬火时,硬度下降了43%.淬火速率低于100℃/s时,随着淬火速率降低,冷却过程中(亚)晶界及晶内弥散粒子处非均匀形核析出η平衡相的数量和尺寸明显增加,时效强化效果明显降低.相同淬火速率时,晶内η平衡相尺寸大于晶界η平衡相尺寸.在所研究的淬火速率范围内建立起硬度值与η平衡相面积分数间的定量关系.

关键词: Al-Zn-Mg-Cu-Cr合金 , 淬火速率 , 微观组织 , 硬度

晶粒组织对Al-Zn-Mg-Cu-Cr合金淬火敏感性的影响

李承波 , 韩素琦 , 刘胜胆 , 邓运来 , 张新明

中国有色金属学报(英文版) doi:10.1016/S1003-6326(16)64319-4

采用硬度测试、光学显微镜、X-射线衍射、扫描电镜、透射电镜和扫描透射电镜等手段研究了晶粒组织对Al?Zn?Mg?Cu?Cr合金淬火敏感性的影响。结果表明：淬火速率从960°C/s减小至2°C/s时，均匀化及固溶后合金(H-合金)时效后的硬度下降了约33%，而挤压及固溶后合金(E-合金)时效后的硬度下降了约43%。H-合金中有粗大等轴状晶粒，E-合金中有拉长的变形晶粒及亚晶粒。慢速淬火H-合金硬度下降33%是由含Cr弥散粒子引起的；E-合金中(亚)晶界的数量增加了大约一个数量级，导致慢速淬火试样硬度的下降幅度进一步增加了10%，淬火敏感性更高。

关键词: 晶粒组织 , Al-Zn-Mg-Cu-Cr合金 , 弥散粒子 , 淬火敏感性