Microstructure evolution in magnesium alloy AZ31 during cyclic extrusion compression
Microstructure evolution in magnesium alloy AZ31 during cyclic extrusion compression
复制标题
镁合金AZ31在循环挤压压缩过程中的显微组织演变
DOI：
10.1016/j.jallcom.2007.07.116
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发表时间：
2008-08-25
影响因子：
6.2
通讯作者：
Hjelen, J.
中科院分区：
文献类型：
--
作者：
Chen, Y. J.;Wang, Q. D.;Hjelen, J.
采用光学显微镜、透射电镜和电子背散射衍射（EBSD）研究了AZ31镁合金在循环挤压压缩（CEC）过程中的组织演变。经573 K加热后，AZ31合金的平均晶粒尺寸为1.77 μ m，晶粒细度为150 +/- 150 nm。细粒菌落具有一定的代表性，随着CEC积累菌株的增加，菌落的粒径逐渐减小，分布更加均匀。随着CEC通过次数的增加，低角晶界（lagb）的比例有减小的趋势，而平均取向偏差有增大的趋势。AZ31合金在CEC过程中形成微织构，随着CEC次数的增加，微织构逐渐减弱。引入了镁合金晶粒细化的复合机理来解释镁合金在CEC加工过程中的组织演变。(C) 2007 Elsevier B.V.版权所有
The microstructure evolution of an AZ31 Mg alloy during cyclic extrusion compression (CEC) is investigated by optical microscopy, TEM and electron backscatter diffraction (EBSD). The mean grain size of 1.77 mu m with fine grains of 150 +/- 150 nm for AZ31 alloy is obtained after CEC 7 passes at 573 K. The colonies of fine grains have a representative grain size which decreases and develops a more homogeneous distribution with the increase of CEC accumulated strain. The fraction of low angle grain boundaries (LAGBs) tends to decrease while the average misorientation tends to increase with increasing number of CEC pass. Micro-textures are formed in AZ31 alloys during CEC and tend to be weaker as the CEC pass increases. A compound mechanism of grain refinement for magnesium alloys is introduced to explain the microstructure evolution during CEC processing. (C) 2007 Elsevier B.V. All rights reserved.