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首页> 外文会议>2006 BIMW >Microstructure and Thermal Stability of Al-Mg-Mn Alloys by Equal Channel Angular Pressing at Elevated Temperature
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Microstructure and Thermal Stability of Al-Mg-Mn Alloys by Equal Channel Angular Pressing at Elevated Temperature

机译：高温下等通道角挤压Al-Mg-Mn合金的组织和热稳定性

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Two Al-Mg-Mn alloys having similar compositions but with and without Zr addition were subjected to equal channel angular pressing (ECAP) at 350°C using route B_C and a 90° die, followed by water quenching or air cooling. A series of annealing experiments were conducted at various temperatures from 400°C to 460°C on the water-quenched alloys. Fine structures with grain size of approximately 1～2μm were obtained in these alloys after 6 passes. The water-quenched alloy containing Zr exhibited finer structure compared with the Zr-free alloy in the same cooling condition, which was due to the existence of Al_3Zr dispersoids. And in the air cooling condition, it was found that in the Zr-free alloy static recovery occurred, and in partial regions some small grains without dislocation inside appeared suggesting the occurrence of static recrystallization. This demonstrated a fairly restored structure. However, the microstructure of the alloy containing Zr kept stable during the air cooling process. In addition, in the annealing experiments, secondary recrystallization took place in the Zr-free alloy annealed at 410°C for 1h, while the alloy containing Zr kept stable up to 460°C. TEM observation showed that the Al_3Zr dispersoids pinned the motion of the grain boundaries, thereby the secondary recrystallization and grain growth were inhibited.
机译：使用路径B_C和90°模具在350°C下对具有相似成分但添加和不添加Zr的两种Al-Mg-Mn合金进行等通道角挤压（ECAP），然后进行水淬或空气冷却。在400°C至460°C的不同温度下，对水淬合金进行了一系列退火实验。经过6次通过后，这些合金获得了晶粒尺寸约为1-2μm的精细组织。在相同的冷却条件下，含Zr的水淬合金比不含Zr的合金具有更好的组织，这是由于存在Al_3Zr分散质。并且在空冷条件下，发现在无Zr合金中发生了静态恢复，并且在部分区域出现了一些内部没有位错的小晶粒，这表明发生了静态再结晶。这表明了一个相当恢复的结构。但是，在空气冷却过程中，含Zr合金的显微组织保持稳定。另外，在退火实验中，二次重结晶在410℃退火1h的无Zr合金中进行，而含Zr的合金在460℃下保持稳定。透射电镜观察表明，Al_3Zr分散质钉扎了晶界的运动，从而抑制了二次再结晶和晶粒长大。

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