摘要
针对过共晶铝硅合金经过P变质后初生硅仍然粗人大的问题,采用Cu-9%P合金变质处理Al-15%Si、Al-18%Si、Al-20%Si合金,变质处理后对熔体进行搅拌,研究了搅拌工艺对变质处理效果的影响,分析了熔体搅拌提高变质效果机理。结果表明,Cu-P合金变质过共晶铝硅合金时,对熔体进行搅拌可显著提高变质效果,初生硅最高可细化85%;在最佳搅拌时间内,搅拌强度越大、硅含量越高,变质效果越好;搅拌熔体迫使富P区域内AIP停止生长,熔体流动速度越快,对富PP区域内AlP的冲刷越强烈,越容易得到细小的AlP;搅拌熔体能够增加组织中初生α相的数量,搅拌工艺合适时,典型的共晶组织基本消失,可获得连续的α基体上均匀分布细小初生硅的凝固组织。
The primary silicon is still rough in hypereutectic Al-Si alloys with P modification. Aimed at this issue, Al-15% Si, Al-18%Si and Al-20%Si alloys were modified by the Cu-9%P alloy, and then the melts were stirred. The influences of the stirring parameters on the modification effect were studied. The mechanism that the melt stirring can improve the modification effect was analyzed. The results show that the melt stirring can obviously enhance the modification effect of hypereutectic Al-Si alloys modified by the Cu-P alloy, and the primary silicon can be refined up to 85%. Within the optimum stirring time, the stronger the stirring is and the higher the silicon content is,the better the modification effect is. The melt stirring forces the AlP in the P-rich region to stop growing. The faster the velocity of the melt flow is, the stronger the scour to AlP in P-rich region is, and the easier it is to obtain fine AlP. The melt stirring can also increase the quantity of the primary a in the microstructure. The typical eutectic structure basically disappears if the stirring parameters are suitable and the microstructure of the tiny primary silicon evenly distributed in the continuous a matrix is obtained.
作者
陈淑英
马胜男
岳旭东
李青春
常国威
Chen Shuying;Ma Shengnan;Yue Xudong;Li Qingchun;Chang Guowei(Liaoning University of Technology,Jinzhou 121001,China)
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2019年第3期1008-1014,共7页
Rare Metal Materials and Engineering
基金
国家自然科学基金面上项目(51674138)
