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基于真实微观结构的SiC_p/Al复合材料轧制过程模拟
Rolling Process Simulation of SiC_p/Al Composites via a Microstructure-Based Model

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阚盈 1   刘振刚 1   张士宏 1 *   张立文 2   程明 1   宋鸿武 1  
文摘 SiC_p/Al复合材料具有高比强度、 高比刚度、 高耐磨性、 低热膨胀系数和高热导率的优点, 主要应用于航空航天领域中的关键结构件。 轧制是生产SiC_p/Al复合材料最常用的塑性加工手段之一。 在轧制SiC_p/Al复合材料时, 坯料容易产生边部裂纹缺陷, 这种缺陷除了与复合材料塑性较差有关之外, 还与轧制压下量选择不合理有关。 为了准确预测SiC_p/Al复合材料的轧制缺陷, 建立了基于SiC_p/Al复合材料真实微观结构的板材轧制过程有限元模型, 该模型中嵌入了基体延性损伤断裂、 颗粒脆性断裂和界面损伤断裂模型。 用实验曲线校对法确定了损伤断裂模型参数。 模拟了相对压下量为5%, 10%, 20%和25%时SiC_p/Al复合材料的轧制过程, 结果表明, 在相对压下量为25%时, 变形不均匀引起的边部拉应力导致了对应区域微观结构的损伤断裂, 从而使复合材料板材产生边裂缺陷。 在拉应力作用下, 孔隙在增强颗粒与基体材料界面处形核, 随着变形进行, 孔隙在基体材料中扩展聚集, 最终导致复合材料产生边裂缺陷。 SiC_p/Al复合材料板材轧制的数值模拟结果与实验结果吻合较好。
其他语种文摘 SiC_p/Al composites, exhibiting high specific strength, high specific stiffness, high wear resistance, low thermal expansion coefficients and high thermal conductivity, are mainly used in key structural parts in the aeronautics and astronautics field. For the production of SiC_p/Al composites, rolling is one of the most commonly used plastic working methods. Unfortunately, edge crack defects arising from the rolling of the SiC_p/Al composites were apt to occur. The generation of edge cracks was related to the poor plasticity of SiC_p/Al composites and the unreasonable height reduction. In order to accurately predict the rolling defect of SiC_p/Al composites, a finite element model of rolling was developed based on the microstructure of SiC_p/Al composites. Matrix damage, particle cracking and interface debonding were coupled in the model. The parameters of damage models were identified using best-fit methods. The rolling processes of SiC_p/Al composites were simulated under relative reductions of 5%, 10%, 20% and 25%. The results showed that when the rolling reduction was 25%, the edge crack of the SiC_p/Al composite plate was caused by tensile stress, which was produced by non-uniform deformation, leading to the damage of microstructures. The microstructure simulation results of SiC_p/Al composites indicated that micro pores initiated at the interface between particles and matrix, and then propagated in the matrix until the composites failed. The simulation results agreed well with experimental results.
来源 稀有金属 ,2015,39(4):289-299 【核心库】
DOI 10.13373/j.cnki.cjrm.2015.04.001
关键词 颗粒增强复合材料 ; 轧制 ; 损伤模型 ; 基于微观结构的模型
地址

1. 中国科学院金属研究所, 辽宁, 沈阳, 110016  

2. 大连理工大学材料科学与工程学院, 辽宁, 大连, 116024

语种 中文
文献类型 研究性论文
ISSN 0258-7076
学科 金属学与金属工艺
基金 国家科技部高技术研究发展计划项目 ;  国家973计划
文献收藏号 CSCD:5408541

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引证文献 6 篇

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