Interrupted in situ tests at high temperature characterized with X-ray microtomography were employed to study porosity evolution under loading conditions representative of aluminum hot rolling. Coupling digital volume correlation and simulations, it is possible to access, for each pore, its morphological evolution, and the mechanical fields it experienced. The closure kinetics of hundreds of pores were studied, which is described as the pore volume as a function of the hydrostatic integration. Closure kinetics are a function of the shape of the pore. Focus is put on pores with a complex shape which are more detrimental to mechanical properties. Their closure kinetics are exponential due to the pore fragmentation during closure. The closure of complex pores is fostered by an initial orientation perpendicular to the loading direction and a low initial fragmentation. Based on the closure kinetics of 243 complex pores, a new pore closure model is proposed.

采用以 X 射线显微断层扫描为特征的高温下中断原位测试来研究代表铝热轧的负载条件下的孔隙率演变。结合数字体积相关性和模拟，可以访问每个孔隙的形态演变及其经历的力学场。研究了数百个孔的闭合动力学，其被描述为作为流体静力积分函数的孔体积。闭合动力学是孔形状的函数。重点放在形状复杂的孔上，这些孔对机械性能更有害。由于闭合过程中的孔碎裂，它们的闭合动力学是指数的。垂直于加载方向的初始取向和低初始碎裂促进了复杂孔隙的闭合。基于243个复杂孔隙的闭合动力学，提出了一种新的孔隙闭合模型。