对多向锻造变形下铸态AZ80镁合金晶粒取向进行研究，结果表明：晶粒转动和取向的定向流动是材料塑性变形中择优取向形成的主要原因。在不产生新晶粒的小变形情况下即可通过滑移和孪生使晶粒发生转动形成较强基面取向。实验中除第4道次外，其余前9道次锻压面均出现明显的基面取向，10道次后材料开始呈现随机取向分布。变形温度和变形方式对材料晶粒取向影响较大，适当降低变形温度和采用多向变形方式均能促使锻压面基面取向增强，而道次压下量在本实验中对晶粒取向影响不大。
In this paper the grain orientation of as-cast AZ80 magnesium alloy during multiple forging process was studied. The results show that preferred orientation during plastic flow mostly result from grain rotation and orientation shift. In the case of very small deformation without any initiation of new grains, slipping and twinning resulting in grain rotation may lead to the formation of relatively strong basal preferred orientation. Basal preferred orientation changes with the applied loading axis rotation and is aligned parallel to the compression direction during the first 9 passes except the 4th one. After 10 passes of multiple forging processing, the final orientation distribution is close to random. Forging temperature and deformation mode have an important influence on the evolution of grain orientation while pass strain does not. Both decreasing deformation temperature in some degree and multi-directional deformation mode can promote the formation of strong basal orientation.
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| [1] | |
| [2] | |
| [3] | |
| [4] | |
| [5] | |
| [6] | |
| [7] | |
| [8] | |
| [9] | |
| [10] | |
| [11] |
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