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为优化铝中间合金细化剂的组织,提升细化性能,采用熔配法工艺合成新型Al-Ti-B-RE中间合金晶粒细化剂,合成反应基于热力学和动力学分析是可能的、存在的、自发向右进行,在适当的工艺条件下,在基体中可生成均匀弥散分布的第二相Al_3Ti、TiB_2、Ti_2Al_(20)RE等粒子。采用X射线衍射(XRD)、扫描电镜(SEM)、光学显微镜(OM)和力学拉伸试验等分析方法对所合成材料的微观组织、细化效果及力学性能进行了表征。细化试验表明:自制的Al-5Ti-1B-1RE中间合金细化工业纯铝时,其平均晶粒尺寸小于150μm到达细晶粒度级别。拉伸试验表明:工业纯铝中加入0.2%自制的Al-5Ti-1B-1RE中间合金晶粒细化剂后有更优的机械性能,与未细化工业纯铝相比,抗拉强度提高了28.39 MPa,延伸率增加了29.97%,其性能明显优于某国产的Al-5Ti-1B丝中间合金细化剂。
In order to optimize the microstructure of aluminum master alloy refiner and improve the refining performance, a novel Al-Ti-B-RE master alloy grain refiner was synthesized by the melting process. The synthesis reaction was based on thermodynamic and kinetic analysis. Exist spontaneously to the right, under the appropriate process conditions, in the matrix can be generated uniformly dispersed second phase Al 3 Ti, TiB 2, Ti 2 Al 20 RE and other particles. The microstructure, refinement and mechanical properties of the composites were characterized by XRD, SEM, OM and tensile test. The refinement test shows that the average grain size of homemade Al-5Ti-1B-1RE master alloy is less than 150μm and reaches the level of fine grain size. Tensile tests show that the addition of 0.2% homemade Al-5Ti-1B-1RE master alloy grain refinement agent to industrial pure aluminum has better mechanical properties, and the tensile strength is higher than that of unpurified industrial pure aluminum Up to 28.39 MPa, the elongation increased by 29.97%, and its performance was obviously better than that of some domestic Al-5Ti-1B wire intermediate alloy refiner.