【摘要】 为了抑制熔融铝合金直接氧化过程中的胞状生长,优化复合材料的组织结构,通过热重实验,研究了在熔融Al–Zn–Si合金表面覆盖MgO引发剂对其氧化生长过程的影响。结果表明:MgO能显著缩短铝合金熔融氧化过程的孕育期及Al2O3/Al复合材料的生长时间,有助于复合材料以光滑方式进行氧化生长。Al2O3/Al复合材料结构的不同区域出现均匀度和致密度不同的现象,是Al–Zn–Si和Al–Mg–Si合金不同氧化生长机制共同作用的结果。更多还原

【Abstract】 In order to restrain the celluloid preferred growth in the directed oxidation process of Al–Zn–Si alloy and to improve the microstructure of composites, the effect of MgO surface dopant on the oxidation growth process of Al–Zn–Si alloy was studied by thermogravimetric (TG) analysis. The results show that the incubation period of the directed oxidation process for Al–Zn–Si alloy and the growth time of Al2O3/Al composites can be shortened markedly due to the MgO covering the alloy surface. In addition, it is ob- served that Al2O3/Al composite grows with a macroscopically planar surface. Different areas in the microstructure have different ho- mogenization and relative density due to the difference of molten–oxidation mechanisms in Al–Zn–Si and Al–Mg–Si alloys.更多还原