摘要
采用搅拌摩擦焊(FSW)工艺制备了粉末混合均匀、无缺陷的泡沫铝(AF)预制坯。对获取的高质量预制坯的发泡过程进行研究,探究最佳发泡温度和发泡时间,制备出孔径结构均匀、高孔隙率的铝合金泡沫夹芯板。运用FLUENT中VOF模型,对气泡在熔融铝液中的行为进行了模拟仿真,研究了泡孔在铝基体中的形成、生长、稳定和聚结过程。结果表明,当发泡温度为700℃、发泡时间为110 s时,孔隙率最高,为55.87%。由数值模拟可得,气泡在熔融铝中上浮的过程中伴随着变形,由圆形逐步变成扁平月牙状。在气泡运动过程中,气泡会与周围气泡发生聚合,变成大气泡。
The preforms of aluminum foam(AF)that foaming power was mixed evenly without defects were prepared by friction stir welding(FSW).The foaming process of the high-quality preform was studied,and the optimum foaming temperature and foaming time were explored.The aluminum foam with uniform pore size and high porosity were successfully prepared.VOF model in fluent was used to simulate the behavior of bubbles in molten aluminum,and the formation,growth,stability and coalescence process of bubbles in aluminum matrix were studied.The results show that when the foaming temperature is 700℃ and the foaming time is 110 s,the porosity is highest,55.87%.The numerical simulation shows that the bubble floats up in molten aluminum with deformation,and gradually changes from round to flat crescent.During the bubble movement,bubbles aggregate with the surrounding bubbles and become big bubbles.
作者
张栋
郑昕宇
吴正健
胡志力
ZHANG Dong;ZHENG Xinyu;WU Zhengjian;HU Zhili(Hubei Key Laboratory of Advanced Technology for Automotive Components,School of Automotive Engineering,Wuhan University of Technology,Wuhan 430070,China;Hubei Collaborative Innovation Center for Automotive Components Technology,School of Automotive Engineering,Wuhan University of Technology,Wuhan 430070,China;Hubei Engineering Center of Material Green Precision Forming Technology and Equipment,Wuhan University of Technology,Wuhan 430070,China)
出处
《热加工工艺》
北大核心
2022年第4期69-73,共5页
Hot Working Technology
基金
国家重点研发计划项目(2019YFB1704500)
国家级大学生创新创业训练计划资助项目(S202010497174)
湖北省重点研发计划项目(2020BAB140)
湖北省技术创新重大专项项目(2019AAA007)
武汉市科技成果转化专项项目(2019030703011511)。
