摘要
利用自行研制的交替变向电磁场凝固装置,采用对比实验方法研究了交替变向电磁场对Al5%Cu合金晶粒度、集中缩孔、分散缩孔和缩松以及致密度的影响规律及机理。结果表明:交变电磁场对Al5%Cu合金晶粒形貌和晶粒尺寸产生明显的影响;随着磁场强度的增加,合金晶粒形貌由粗大的柱状晶转变为细小的等轴晶,晶粒尺寸由30.2mm降低到0.2mm;在0.2T强场下试样集中缩孔相对深度缩小了10倍左右,分散缩孔和缩松数量明显减少,铸件的致密度提高了2.9%。
Effects of alternating electromagnetic field on the grain size, concentrating shrinkage cavity, dispersing shrinkage porosity and density of Al-5%Cu alloy were investigated by comparative methods using self-made alternating electromagnetic field apparatus. The results show that the alternating electromagnetic field has a significant effect on the grain morphology and grain size of Al-5%Cu. The grain morphology is changed from a very big columnar structure to a fine equiaxed one and the grain size is decreased from 30.2mm to 0.2mm with the increase in alternating electromagnetic field intensity. The depth of concentrating shrinkage cavity is decreased about ten times when magnetic intensity is 0.2T. The volumes of both dispersing shrinkage cavity and shrinkage porosity are reduced, leading to the increase in alloy density about 2.9%.
出处
《中国有色金属学报》
EI
CAS
CSCD
北大核心
2005年第6期888-892,共5页
The Chinese Journal of Nonferrous Metals
关键词
Al-5%Cu合金
交替电磁场
集中缩孔
缩松
Al-5%Cu alloy
electromagnetic field
concentrating shrinkage cavity
shrinkage porosity
