Transactions of Materials and Heat Treatment

Title：Numerical simulation of superplastic micro-extrusion of Zr-based bulk amorphous alloy

Authors： WU Xiao1 2 LI Jian-jun1 WANG Xin-yun1 ZHENG Zhi-zhen1(1.State Key Laboratory of Material Processing and Die and Mould Technology Huazhong University of Science and Technology Wuhan 430074 China 2.Department of Mechanical and Electronic Engineering Wuhan I

Unit：

KeyWords： bulk metallic glass super-cooled liquid region superplasticity micro backward-extrusion numerical simulation

ClassificationCode：TG371

year,vol(issue):pagenumber：2009,34(4):39-44

Abstract：

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.

Funds：

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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