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摘要：
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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。
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The flow-stress model of Zr_55Cu_30Ni_5Al_10 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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基金项目：
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国家自然科学基金重点资助项目(50635020);;
教育部技术研究重点项目(107075);;
武汉科技学院青年培育基金(DTL20073206)
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作者简介：
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参考文献：
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