ZL102铝硅合金的三维显微组织形态研究

Three-Dimensional Microstructure Morphology of ZL102 Al-Si Alloy

采用连续切片-三维重建技术研究ZL102铝硅合金的三维显微组织形态,结果发现ZL102中初晶Si呈多角块状,呈现棱面相生长特征。二维组织中共晶Si一般多为不规则针状,分散分布在合金基体中,但三维组织中共晶Si多呈层片状,多与初生Si连接在一起的,说明共晶Si凝固生长中并不一定需要重新形核。研究中获得的ZL102铝硅合金的三维显微组织不仅能真实反映合金凝固组织,而且有利于合金中Si相凝固机制的判断。

A three-dimensional microstructure of ZL102 aluminum-silicon alloy was reconstructed using a continuous slicing and three-dimensional reconstruction technique. The results show that the primary silicon phase was polygonal shape with angular edges, featured by a facial growth. In a two-dimensional observation, usually the eutectic Si is irregularly acicular, dispersed in the alloy matrix. However, the three-dimensional eutectic Si is lamellar, and connected to the primary Si. This indicates that the eutectic Si in a solidification growth does not need additional nucleation. The microstructure morphology of ZL 102 Al-Si alloy obtained in this study not only can reflect the real microstructure of alloy, but also put certain insight in the solidification mechanisms of the alloy.