超声处理对AZ91D-3Ca镁合金凝固组织的影响  

Influence of Ultrasonic Melt-Treatment on Solidification Structure of Ignition-Proof Magnesium Alloy AZ91D-3Ca

作　　者：付浩[1] 周全[1] 

机构地区：[1]南昌航空大学航空制造工程学院

出　　处：《特种铸造及有色合金》2013年第2期178-181,共4页Special Casting & Nonferrous Alloys

基　　金：江西省科技支撑计划资助项目(2010EHB01800);江西省教育厅科技项目(GJJ11521)

摘　　要：以超声波输出功率、处理时间、熔体施振温度和铸型预热温度为研究对象,对AZ91D-3Ca阻燃镁合金熔体施加超声振动进行了研究。结果表明,通过控制超声熔体处理参数与凝固条件可以细化AZ91D-3Ca阻燃合金的凝固组织。当超声功率密度在0～5.56W/cm2时,随着超声功率密度的增大,合金的初生晶粒逐渐细化;当功率密度大于5.56W/cm2时,合金的初生晶粒不再发生明显变化。当超声处理时间为15s时,合金的初生晶粒最为细小;在30～60s范围内,超声处理时间的增加对初生晶粒细化效果的影响不明显。在600～690℃范围内,随着施振温度的提高,合金的初生晶粒先细化后粗化,其转折点为630℃。在室温～690℃范围内,随着铸型预热温度的增加,合金的初生晶粒逐渐粗化。The effects of ultrasonic melt-treatment parameters, such as power density, stirring time, vi- bration temperature and preheating temperature of mold, on solidification structure of ignition-proof magnesium alloy AZ91D-3Ca were investigated. The results show that solidification structures of igni- tion-proof magnesium alloy AZ91D-3Ca can be refined by controlling ultrasonic melt-treatment parame- ters and solidification conditions. Primary grain in the alloy is refined gradually with inereasing in the power density in range of 0～5.56 W/cm2. However, with power density more than 5.56 W/cm2 , chan- ges of primary grain in the alloy can be ignored. With the stirring time of 15 s, refinement effect of pri- mary grain exhibits desirable. With stirring time increasing in the range of 30～60 s, the effect of micro- structure refinement can be ignored. In the range of 600～690 ℃ ,with the increase of the ultrasonic vi- bration temperature, primary grain of the alloy is refined firstly and then coarsened, and the critical point is 630 ℃. From room temperature to 690 ℃ ,with preheat temperature of the mold increase, pri- mary grain in the alloy is coarsened increasingly.

关 键 词：阻燃镁合金 超声波 熔体处理 

分 类 号：TG146.22[一般工业技术—材料科学与工程]