半固态ZA27合金电磁搅拌工艺及其组织和性能的研究

Study of the Process, Structure and Properties of the Semi-Solid ZA27 Alloy by Electromagnetic Stirring

采用电磁搅拌装置制备ZA27合金半固态浆料,研究不同搅拌参数对非枝晶组织和性能的影响。结果表明;搅拌电流越大,晶粒越细小致密,搅拌时间短不足以打碎、圆整ZA27凝固时的先结晶组织,搅拌时间长,先结晶相易发生聚集长大,导致力学性能下降。搅拌时间10 min左右,ZA27合金的组织和性能较佳。

ZA27 semi-solid slurries were prepared by electromagnetic stirring setting, the ettect of different stirring parameters on non-dendritic structure and its mechanical properties have been studied. Results of experiments are as follows： grains of crystals are fine and close along with the increase of electric current. When the stirring time is short, it is difficult to break up and round the microstructure of earlier crystals. When the stirring time is long, earlier crystal phase is easy to conglomeration and grow up, it weakens the mechanical properties of ZA27 alloy. When the stirring time is about 10 min, the structure and properties of ZA27 alloy are better.