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首页> 外文会议>International Conference on Metal Forming >Effect of variable temperature repetitive upsetting-extrusion on microstructure and texture of Mg-Gd-Y-Zr alloy
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Effect of variable temperature repetitive upsetting-extrusion on microstructure and texture of Mg-Gd-Y-Zr alloy

机译：可变温度重复镦慢挤出对Mg-Gd-Y Zr合金微观结构和质地的影响

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摘要

The Mg-Gd-Y-Zr alloy was subjected to the variable temperature repetitive upsetting-extrusion process, a kind of severe plastic deformation. The evolution of microstructure, texture and deformation mechanism under different passes was analysed. It is found that when the deformation temperature was relatively high at 420°C, the morphology of the grains was approximately equiaxed. Some precipitated phases were distributed at the grain boundaries and the fraction of them was relatively low. When the deformation temperature was decreased, the precipitation phases increased remarkably, playing the pinning effect and stimulate the particle stimulated nucleation (PSN) mechanism to significantly refine the grain. As the number of deformation passes increased, The grains were remarkably refined from the 80.45 μm of initial billet to 4.08 μm of 4-pass sample, gaining the more uniform microstructure. With the increase of deformation amount, the coarse grains decreased with the fraction of dynamic recrystallization increased and secondary dynamic recrystallization occurred inside the grown dynamic recrystallized grains. The (1010) fiber texture disappeared and the texture was weakened. The random of the high-temperature deformation texture was obvious due to the non-basal slip of alloy which was easier to activate.
机译：将Mg-Gd-Y-Zr合金经受可变温度重复镦粗挤出工艺，一种严重的塑性变形。分析了不同通段下微观结构，质地和变形机制的演变。发现当420℃的变形温度相对较高时，晶粒的形态近似轴。在晶界分布一些沉淀的相，它们的一部分相对较低。当变形温度降低时，沉淀阶段显着增加，捕获钉效效果并刺激颗粒刺激的成核（PSN）机制，以显着细化晶粒。随着变形通过的次数增加，晶粒从80.45μm的初始方坯中显着精制到4.08μm的4-通过样品，获得更均匀的微观结构。随着变形量的增加，随着动态重结晶的级分，粗粒随着动态再结晶的分数而增加，并且在生长的动态再结晶晶粒内发生次级动态重结晶。 （1010）纤维纹理消失，纹理削弱。由于合金的非基础滑动，高温变形纹理的随机显而易见，这是更容易激活的合金。

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