【作者】 李艳霞； 赵红健； 刘俊友；

【Author】 LI Yanxia,ZHAO Hongjian,LIU Junyou (School of Materials Science and Engineering,University of Science Technoloy Beijing.Beijing,100083,China )

【机构】 北京科技大学材料科学与工程学院；

【摘要】 采用熔铸工艺制备了Al-22 wt.%Si和Al-27 wt.%Si两种高硅铝合金。通过L9(3~4)正交试验研究了变质剂添加量、变质温度、保温时间和冷却速度等工艺参数对两种合金组织细化的影响。结果显示工艺参数对组织中初生硅相平均直径的影响程度与合金中硅含量有关,其中Al-22 wt.%Si合金受变质保温时间影响最大,而Al-27.wt%Si合金受变质剂的添加量影响最大。获得的两种合金组织细化优化工艺,可将初生硅相平均直径细化至20μm,同时合金具有高的硬度、强度,耐磨性同时获得改善。更多还原

【Abstract】 Al-22 wt.%Si alloy and Al-27 wt.%Si alloy were prepared by melting-casting.A L9(3~4) orthogonal test was designed to research the influences of processing parameters including the modifier addition level,melting temperature,holding time and cooling rate on the microstructure refining in both alloys.The results show that the influencing extent of the parameters depends on the silicon content,where the holding time is the most important factor to the diameter of primary Si in Al-22 wt.%Si,and the modifier addition level is the most important factor in Al-27 wt.%Si alloy.The optimum conditions to refining the primary Si in both alloys are obtained under which the diameter of primary Si reaches 20±1μm.Meanwhile the two alloys have high hardness,strength and improving wear resistance.更多还原