液态浸渗挤压Al_2O_(3sf)/2A12铝基复合材料表面损伤的预测  

Prediction of surface damage for Al_2O_(3s)f/2A12 composites by liquid infiltration-extrusion process

作　　者：刘健[1] 齐乐华[1] 周计明[1] 苏力争[1] 

机构地区：[1]西北工业大学机电学院,西安710072

出　　处：《材料研究学报》2009年第6期616-621,共6页Chinese Journal of Materials Research

基　　金：国家自然科学基金50575185;国防预研基金9140A18040709HK03;清华大学先进成形制造教育部重点实验室开放基金2008004资助项目~~

摘　　要：建立了Al2O3sf/2A12铝基复合材料液态浸渗挤压表面缺陷预测的数学模型, 基于L9（34）正交试验实验表模拟了9种在不同工艺参数下液态浸渗挤压成形Al2O3sf/2A12铝基复合材料制件的损伤分布规律, 研究了工艺参数对损伤形成的影响规律. 结果表明： 由于不均匀变形以及制件表面的局部过热, 在坯料模角处易产生表面环向裂纹; 保压时间对表面损伤形成的影响最大, 其次为浇注温度和模具预热温度, 挤压速度的影响比较小. 通过优化工艺参数, 可以有效地避免表面损伤的产生, 挤出表面质量良好的制件, 模拟结果与实验结果基本吻合.A model for predicting the surface damage of Al2O3sf/2A12 composites by liquid infiltration-extrusion process was established, and the distribution of surface damage was obtained under nine groups of process parameters based on orthogonal experimental design. The influence of process parameters on the surface damage was investigated. The results show that the surface cracks usually form at the mould outlet, which results from the inhomogeneous metal flow and the partial overheating. Pressure-keeping time is the dominant parameter for controlling the surface quality. Surface damage can be effectively avoided by optimizing the process parameters. The simulated values basicly accord with the experiment results.

关 键 词：复合材料 液态浸渗挤压 表面损伤 有限元 预测 

分 类 号：TB331[一般工业技术—材料科学与工程] TG37[金属学及工艺—金属压力加工]