摘要
基于改进的自制Bridgman水平卧式定向凝固装置,研究了横向直流稳恒磁场对Zn-35Al-2.5Cu-1.5Ti合金显微组织的影响。通过金相显微组织观察、显微组织定量表征等方式,分析了磁场对锌合金显微组织的影响规律。结果表明,随着磁感应强度增加,因磁场存在而产生的热电磁流体动力学(TEMHD)效应增强,促进液-固界面糊状区熔体流动,有利于原子扩散迁移,显微组织粗化;牵引速度增加,TEMHD效应减弱,凝固组织细化。当磁感应强度为0.2T,定向凝固牵引速率为30μm/s时,锌合金显微组织粗化严重。施加磁场与未施加磁场的合金显微组织相比,其一次臂、二次臂间距增加最大幅度可达44.9%和52.2%。
Influences of transverse DC static magnetic field on microstructure of Zn-35Al-2.5Cu-1.5Ti alloy were investigated by modified self-developed horizontal Bridgman directional solidification device. Influences of the magnetic field on the microstructure of the zinc alloy were investigated by observing the microstructure and its quantitative characterization. The results show that with increasing in magnetic induction intensity, the microstructure in the directional solidified Zn alloy is coarsened, which is attributed to the Thermo-Electric MagnetoHydroDynamic （TEMHD） effect generated from the presence of a magnetic field promoting the melt flow in the liquid-solid interface mushy zone and atomic migration. With increasing in drawing velocity, the microstructure is refined as a result of fading of TEMHD. The microstructure in zinc alloy becomes coarse seriously with the magnetic induction intensity of 0.2 T and drawing velocity of 30 μm/s. Compared with the absence of magnetic field, the first arm and the second arm spacing are increased by 44.9% and by 52.2%, respectively.
出处
《特种铸造及有色合金》
CAS
CSCD
北大核心
2013年第7期676-679,共4页
Special Casting & Nonferrous Alloys
基金
辽宁工程技术大学国家自然青年基金前期资助项目(2010053)
关键词
定向凝固
显微组织
热电磁流体动力学效应
组织粗化
锌合金
Directional Solidification
Microstructure
TEMHD Effect
Microstructure Coarseness
Zinc Alloy
