脉冲电流对Al-4.5Cu合金定向凝固组织的影响  

Effects of Pulse Electric Current on Directional Solidification Structure of Al-4.5Cu Alloy

作　　者：陈文杰[1] 廖希亮[1] 甘长红[1] 方燕[1] 翟启杰[1] 

机构地区：[1]上海大学

出　　处：《特种铸造及有色合金》2006年第8期523-525,共3页Special Casting & Nonferrous Alloys

基　　金：国家973计划前期研究专项基金资助项目(2004CCA07000);上海市科学技术委员会优秀学科带头人计划资助项目(04xD14008)

摘　　要：研究了脉冲电流对Al-4.5Cu合金定向凝固过程及组织的影响。结果表明,随着脉冲电流峰值和频率的增大,Al-4.5Cu合金柱状晶被熔断,形态由细条状变为不连续,失去其定向凝固的取向性;且柱状晶间距随电流峰值和频率的增大而减小。由脉冲电流的引入而产生的脉冲磁压力及焦耳热效应在固液界面处造成的强烈扰动是定向凝固组织失去取向性的主要原因。Effects of pulse electric current on directional solidification structure of Al-4.5Cu alloy have been observed. The results revealed that with increasing in peak value of pulse current and frequency, columnar crystal in the Al-Cu alloy is breakdown to convert strip into discontinuous net to disappear its directional orientation. In addition, the space between columnar crystal is decreased with the increase of the peak value and frequency. The strong turbulence resulted from generated pulsed magnetic force and Joule heat effect during the introduction of pulse electric current are responsible for the disappearance of the directional orientation.

关 键 词：脉冲电流 AL-CU合金 定向凝固 柱状晶 

分 类 号：TG27[金属学及工艺—铸造]