Die-filling process during the thixoforming of a ZA27 alloy cylindrical rod |
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| Authors: | T J Chen Y Hao Y D Li |
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| Affiliation: | (1) Key Laboratory for Materials Modification by Laser, Ion and Electron Beams, Ministry of Education, Dalian University of Technology, Dalian, 116024, China;(2) School of Materials Science and Engineering, Dalian University of Technology, Dalian, 116024, China;(3) School of Materials Science and Engineering, Jiangsu University of Science and Technology, Zhenjiang, 212000, China |
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| Abstract: | The die-filling process during thixoforming of a ZA27 alloy cylindrical rod was deduced by analyzing microstructural characteristics
in the semi-solid ingot prior to and after forming, and by analyzing the phenomena occurring during this thixoforming. These
characteristics referred to some constituent segregation, such as a liquid-phase segregation and an inhomogeneous distribution
of primary solid particles. The results indicated that the die-filling process could be properly deduced by using the method
developed in this paper. The inhomogeneous distribution of primary solid particles in the formed rods mainly resulted from
the inhomogeneous distribution in the semi-solid ingot. The detailed distribution was determined by the sequence of the die-filling.
However, the aforementioned liquid segregation was mainly attributed to the die-filling process. The sequence of the die-filling
process was from the bottom of the cylindrical cavity to the top and from the edge to the inner part of the cavity. |
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