低压脉冲磁场下制备半固态AZ91D-3Ca镁合金的研究  

Preparation of Semi-solid AZ91D-3Ca Magnesium Alloy under Low-voltage Pulsed Magnetic Field

作　　者：周全[1] 陈乐平[1] 尹健[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》2010年第12期1089-1092,共4页Special Casting & Nonferrous Alloys

基　　金：江西省自然科学基金资助项目(2008GQC0035)

摘　　要：研究了低压脉冲磁场下半固态AZ91D-3Ca镁合金的制备,考察了磁场作用下模具预热温度和浇注温度对合金初生相形貌的影响。结果表明,通过控制合金的冷却速度,利用低压脉冲磁场可以制备出初生相为蔷薇状晶体的半固态AZ91D-3Ca镁合金坯料;在低压脉冲磁场的作用下,随着模具预热温度的升高或浇注温度的降低,初生枝晶逐渐退化;低压脉冲磁场只有在较高的模具预热温度和较低的浇注温度下才能使初生相发生蔷薇化转变。Preparation of semi-solid AZ91D-3Ca magnesium alloy under low voltage pulsed magnetic field was conducted, and effects of pre-heating temperature of mould and pouring temperature on morphology of primary phase in the alloy were investigated. The results show that, through controlling cooling rate of the alloy, semi-solid AZ91D-3Ca magnesium alloy billets with rosette structure primary phase can be prepared successfully by low voltage pulsed magnetic field. Under low voltage pulsed magnetic field, with increasing in preheating temperature of mould and decreasing in pouring temperature, primary phase dendrites are degraded gradually. Primary phase can be changed from well-developed dendrite to rosette structure under low voltage pulsed magnetic field with only high preheating temperature of the mould or lower pouring temperature.

关 键 词：低压脉冲磁场 半固态 镁合金 

分 类 号：TG146.22[一般工业技术—材料科学与工程] TG249.6[金属学及工艺—金属材料]