Si粉微合金化对钢-铝复合材料界面的影响

采用粉末轧制工艺,在界面添加4％ Si粉进行界面微合金化调控,成功制备出界面结合良好的钢-铝复合材料.研究了界面微合金化设计、扩散退火处理工艺对钢-铝复合材料界面区元素扩散、生成物相的影响规律,探讨了元素Si界面调控的作用机理.结果表明:添加4％ Si粉界面微合金设计,在500℃扩散退火,保温1h热处理工艺下,复合材料界面未出现金属间化合物,600℃扩散退火,保温1h热处理工艺下,仅出现少量化合物Fe2Al5,Si粉界面微合金化处理能延缓界面化合物相生成,使生成Fe2Al5相的扩散温度向高温推移；Si扩散固溶到Fe、Al基体中形成连续固溶体,提高了界面两侧物理及力学性能的连续性,改善复合材料的界面结合.

Effect of silicon microalloying on interface of steel-aluminum bimetallic composite

Steel-aluminum bimetallic composites were prepared by powder rolling.When 4% of the silicon powders were added in the interface,the good interface bonding of steel-aluminum bimetallic composite was obtained.The influence of the design of the microalloying and heat-treatment process on the elements diffusion,new phase in the interface of the composites was studied;meanwhile,the effect mechanism of silicon microalloying technique was analyzed.The results show that no Al-Fe intermetallic compounds are found on the interface after silicon microalloying for steel-aluminum bimetallic composite,and then annealing at 500 ℃ for one hour.Moreover,some little intermetallic compound of Fe2Al5 is found on the interface after annealing at 600 ℃ for one hour.The results show that silicon microalloying can effectively slow interface reaction rate,the annealing temperature of new phase raised to a higher temperature range.Si solubilizes in Fe and Al the solid solution is formed which improves the consistency of physical and mechanical properties to cause interlard good combination.