锻压技术

泡沫铝夹芯板预制坯热变形行为

英文标题：Thermal deformation behavior on aluminium foam sandwich preformed blank

作者：徐文斌1 胡志力1 2 3 庞秋4

单位：1.湖北隆中实验室 2.武汉理工大学现代汽车零部件技术湖北省重点实验室 3.武汉理工大学湖北省材料绿色精密成形工程技术研究中心 4.武汉东湖学院机电工程学院

分类号：TB34

出版年,卷(期):页码：2023,48(5):44-50

摘要：

采用搅拌摩擦焊工艺制备泡沫铝夹芯板预制坯，研究其热变形行为。结果发现：当焊接速度为2000 r·min-1、焊接进给速度为50 mm·min-1、轴肩下压量为0.15 mm时，可以形成粉末混合均匀、致密性良好的泡沫铝夹芯板预制坯。在350~475 ℃的变形温度和0.01~1 s-1的变形速率范围内，随着变形温度上升，泡沫铝夹芯板预制坯的伸长率先升高后下降，于400 ℃时达到最高，而峰值应力随着变形温度的上升而降低；随着变形速率提高，泡沫铝夹芯板预制坯的伸长率持续下降，而峰值应力上升。在350~475 ℃变形温度范围内，建立了描述泡沫铝夹芯板预制坯热变形行为的Fields-Backofen模型。研究成果为泡沫铝夹芯板复杂曲面构件的制备及应用提供了理论和技术基础。

The aluminum foam sandwich preformed blank was produced by friction stir welding process, and its thermal deformation behavior was studied. The results find that when the welding speed is 2000 r·min-1, the welding feed rate is 50 mm·min-1 and the pressing down of shoulder is 0.15 mm, aluminum foam sandwich preformed blank with uniform powder mix and good denseness can be formed. In the deformation temperature range of 350-475 ℃ and the deformation rate range of 0.01-1 s-1, as the deformation temperature rises, the elongation of aluminum foam sandwich preformed blank increases first and then decreases, reaching the highest at 400 ℃, and the peak stress decreases with the increasing of deformation temperature. As the deformation rate increases, the elongation of aluminum foam sandwich preformed blank continues to decrease, while the peak stress increases. In the deformation temperature range of 350-475 ℃, a Fields-Backofen model is established to describe the thermal deformation behavior of aluminum foam sandwich preformed blank, which provides a theoretical and technical basis for the preparation and application of aluminum foam sandwich components with complex curved surfaces.

基金项目：

湖北隆中实验室自主创新研究项目（2022ZZ-04）；湖北省自然科学基金资助项目（2021CFB523）；湖北省重点研发计划项目（2021BAA200）；湖北省科技重大项目（2022AAA001）

作者简介：徐文斌(1997-)，男，硕士研究生，E-mail：634269813@qq.com；通信作者：庞秋(1979-)，女，博士，硕士生导师，副教授，E-mail：pqiuhit@126.com

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