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中文摘要：
利用压缩实验数据建立了Zr55Cu30Ni5Al10大块非晶合金在过冷温度区域内的流动应力模型,并选用DE-FORM-3D软件对杯形非晶合金零件超塑性微挤压成形过程进行了模拟,得到了挤压过程中坯料的速度场、应变速率场和应力场的分布规律。分析发现在挤压过程中材料的应变速率极不均匀,因此,对材料的流动变形过程进行了合理分区,分析各区域的形状、大小及变化历程。在此基础上,利用反挤压工艺成功挤出了外径为2.2 mm、壁厚为0.05 mm的杯形零件。SEM显示,该成形件壁厚均匀,尺寸和几何形状满足设计要求。
英文摘要：
The flow-stress model of Zr55 Cu30 Ni5 Al10 bulk metallic glass in super-cooled liquid region was established utilizing compression experiment data, and the micro backward extrusion process of cup-shaped metallic glass parts in super-cooled liquid state was simulated by means of DEFORM-3D software. The velocity field, strain-rate field and stree field were obtained. The results indicate that the distribution of strain rate is highly non-uniform. The reasonable distorting regions were given and the shapes, size and change course of the regions were analysed. Based on the research, the micro-cups with the diameter of 2.2 mm and wall thickness of 0. 05 mm were fabricated by micro-backward extrusion and observed by SEM. The results show that the thickness of the cup is uniform, the sizes and shapes meet the design requirement.
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