多向镦拔2219铝合金硬质相形貌观测与分析  

Morphology observation and analysis of hard phase of 2219 aluminum alloy with multi-directional upsetting and stretching

作　　者：兰箭[1] 杜诺 付兴宇 张世超 LAN Jian;DU Nuo;FU Xing-yu;ZHANG Shi-chao(School of Materials Science and Engineering,Wuhan University of Technology,Wuhan 430070,China)

机构地区：[1]武汉理工大学材料科学与工程学院,湖北武汉430070

出　　处：《塑性工程学报》2024年第1期172-177,共6页Journal of Plasticity Engineering

基　　金：国家自然科学基金资助项目(51975439)。

摘　　要：为进一步优化2219铝合金的力学性能,采用多向镦拔工艺改善2219铝合金中硬质相形貌。随着累积变形量增加到7.9,硬质相面积占比从9.66%降低为7.37%;并且其中长径比大于3的硬质相占比由初始的83.15%降低到34.23%。基于应变梯度理论建立了长椭球硬质相的细观模型,考虑到硬质相尺度效应,当其长径比从1增加到8时,应力集中系数从3.17增大为11.67;随着变形量的增加,硬质相的尺度效应逐渐弱化。通过多向镦拔实验证明了其可以有效改善硬质相形貌;将实验结果与计算结果进行对比,证明了应变梯度理论应用于2219铝合金硬质相分析的可行性。To further optimize the mechanical properties of 2219 aluminum alloy,the multi-directional upsetting and stretching process was used to improve the hard phase morphologies of 2219 aluminum alloy.As the cumulative deformation amount increases to 7.9,the area percentage of hard phase decreases from 9.66%to 7.37%,and the percentage of hard phase with the length-to-diameter ratio greater than 3 decreases from the initial 83.15%to 34.23%.Based on the strain gradient theory,the micro-model of the long elliptical hard phase was established.Considering the scale effect of hard phase,the stress concentration coefficient increases from 3.17 to 11.67 when the length-to-diameter ratio increases from 1 to 8.With the increase of deformation amount,the scale effect of hard phase gradually weakens.The multi-directional upsetting and stretching experiment proves that it can improve the hard phase morphologies effectively.By comparing the experimental results with the calculated results,the feasibility of applying strain gradient theory to hard phase analysis of 2219 aluminum alloy was proved.

关 键 词：2219铝合金 多向镦拔 硬质相 细观力学 

分 类 号：TG146.22[一般工业技术—材料科学与工程]