超声波搅拌对ZA27合金组织的影响  

Effects of Ultrasonic Application on Microstructure of ZA27 Alloy

作　　者：莫立娥[1] 程和法[1] 李拥军[1] 项苹[1] 张章[1] 

机构地区：[1]合肥工业大学

出　　处：《特种铸造及有色合金》2007年第S1期148-150,共3页Special Casting & Nonferrous Alloys

摘　　要：在ZA27合金熔体中导入超声波搅拌能够获得成分均匀、晶粒细小的半固态ZA27合金浆料,本文研究了超声波开始导入时的熔体温度(即熔体过热度)和搅拌时间对ZA27合金初生相尺寸、形貌和分布形态的影响。结果表明,随着超声波开始导入时熔体过热度的增加,初生相的细化效果大幅度地降低;随着超声波搅拌时间的增加,会得到一个初生相最细小、圆整、分布最均匀的时间点,随后随搅拌时间的延长,初生相晶粒会出现聚集、长大;超声波搅拌能减少晶粒的聚集,使其分布更均匀。The semi-solid ZA27 alloy which of the refined and well-distributed grain can be obtained by stirring with ultrasonic installing.The effects of starting temperature of ultrasonic application (i.e.Melt Superheating) and application time of ultrasonic stirring on microstructure of ZA27 alloy were investigated.The result revealed that the grain size tends to be increased with increasing the starting temperature of ultrasonic application.And there is an appropriate application time of ultrasonic stirring that the grain is to be better refined and distributed.Then when the time is more long,primary α-Al phase is easy to get together and grow much large.And also the application of ultrasonic stirring can decrease the tends of the earlier crystals' getting together and can make the grain well-distributed.

关 键 词：超声波搅拌导入时熔体温度 超声波搅拌时间 等温搅拌 ZA27合金 初生相 晶粒细化 

分 类 号：TG27[金属学及工艺—铸造]