摘要
为了探索双级时效工艺对富铁ADC12铝合金的影响,在不同二级时效温度下对合金进行热处理,探讨合金的显微组织和硬度的变化规律。结果表明:随着二级时效温度的提高,合金中方块状初生硅棱角钝化,树枝状共晶硅细化成球状,长针状富铁相细化且圆滑,硬度逐渐提高。在170℃的二级时效温度下,合金组织分布均匀,布氏硬度比T6工艺的提高了14.1%,但当二级时效温度达到180℃时,合金会出现过时效现象,针状组织再次聚集,硬度急剧降低。
In order to investigate the effect of duplex aging process on ADC12 with rich Fe phase, different second aging heat treatment processes were carried out on these alloys. The variations of microstructures and hardness were discussed. The results indicate that sharp-angled parts in the blocky primary Si were smooth with the increase of second aging temperatures. Meanwhile, the eu-tectic Al-Si with dendritic shapes was refined and turn into the sphere shape. The needle like Fe-rich phase was also refined and smoothed with the hardness promotion. The alloy with homogeneous-ly microstructure was obtained by using the second aging process at 170 ℃, whose hardness ( HB) is 14. 1%, higher than that of the alloy treated by using T6 process. The over aging was observed af-ter the alloy was treated by the second aging at 180 ℃. The needle phase agglomerated again in the microstructure, which led to the reduction of hardness.
出处
《广西大学学报(自然科学版)》
CAS
北大核心
2016年第5期1702-1708,共7页
Journal of Guangxi University(Natural Science Edition)
基金
国家自然科学基金资助项目(11364003
51661004)
广西自然科学基金资助项目(2012GXNSFBA053143
2014GXNSFAA118025)
广西科学研究与技术开发重大专项计划(桂科重14122001-3)
广西大学有色金属及材料加工新技术教育部重点实验室开放基金资助(GXKFJ09-10)
广西大学"大学生创新创业训练计划"资助项目(201410593156)
广西生态铝产业协同创新中心资助项目