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The thermal stability of Al3(Sc,Zr) precipitates in the cold worked Al-Mg-Sc-Zr alloy after elevated temperature exposure was investigated. The evaluation was conducted using room temperature tensile, Vicker's hardness, optical metallography and scanning electron microscope (SEM) with the backscatter. The results show that the Al3(Sc,Zr) precipitates and mechanical properties have no obvious change, and the grains keep elongated along the working direction as that in cold worked sample after exposure at 300℃ for 1 000 h. The coarsening of Al3(Sc,Zr) precipitates occurs and is no longer effective on the recrystallization resistance, and partial recrystallization is observed after 400℃ exposure. In particular, after 500℃ exposure, the hardness decreases drastically and the alloy has fully recrystallized due to the obvious coarsening of Al3(Sc,Zr) precipitates. 相似文献
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针对关节数较多的蛇形机器人在运动规划中较多参量不便推导的情况,以Serpenoid曲线为基础,提出在运动规划中用插值思想来设置有效的运动数据。设计了一种结构简单、成本较低,能够在二维和三维空间中较为灵活运动的16关节蛇形机器人,实验结果表明,蛇形机器人能实现翻滚、弓字形爬行、盘曲、抬头、俯扑等多种动作方式,证实了插值思想在运动规划中的方便性和有效性。 相似文献
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变形Al-Mg-Sc-Zr合金退火组织的TEM观察 总被引:9,自引:0,他引:9
采用真空感应熔炼制备Al—6Mg-0.4Mn-0.2Sc-0.1Zr-0.1Cr(质量分数,%)合金,研究了冷变形态合金分别在350,400,450和500℃退火1h后微观组织和力学性能的变化.TEM观察表明,冷变形态的合金组织为交错缠结的位错胞经过350℃退火后位错在晶界规律排列,密度大大降低,发生回复,晶粒保持在500nm以下.在400—500℃的退火过程中再结晶过程缓慢进行.由于Al3(Sc,Zr)相的Zener拖曳作用,合金的再结晶温度区间宽化.力学性能在350℃退火时发生明显变化,随退火温度的进一步升高变化不明显. 相似文献
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