(1. 江西理工大學(xué)材料科學(xué)與工程學(xué)院，贛州 341000；
2. 江西理工大學(xué)機(jī)電工程學(xué)院，贛州 341000)
摘 要: 利用Fluent軟件主要研究半固態(tài)A356稀土合金熔體在施加電磁攪拌后的溫度場(chǎng)分布規(guī)律以及電磁場(chǎng)對(duì)半固態(tài)A356稀土合金熔體中初生α相形貌演變的影響。結(jié)果表明：在電磁攪拌相同時(shí)間(15 s)、不同頻率下，熔體在40 Hz時(shí)的溫度場(chǎng)較5 Hz、15 Hz和30 Hz時(shí)的分布更加均勻；半固態(tài)A356-Yb合金熔體經(jīng)620 ℃澆注，在電流頻率30 Hz時(shí)攪拌15 s，并在590 ℃保溫10 min，初生相的平均等積圓直徑為62.3 μm，平均形狀因子為0.78，此時(shí)，晶粒最圓整細(xì)小，組織形貌最佳。
關(guān)鍵字: 半固態(tài)；A356稀土合金；電磁攪拌；初生α相；溫度場(chǎng)分布
（1. School of Material Science and Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, China;
2. School of Mechanical and Electronic Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, China）
Abstract:The temperature field distribution of semisolid A356 alloy melt by the computational fluid dynamics software Fluent, and the effect of electromagnetic on the morphology of primary α phase of semisolid A356 alloy melt were mainly investigated. The results show that the temperature field distribution of alloy melt at 40 Hz is more uniform than those at 5 Hz, 15 Hz and 30 Hz at the same time. The average equal-area circle diameter and average shape factor of primary phase are 62.3 μm and 0.78, respectively, after semisolid A356 alloy is pouring at 620 ℃, stirring for 15 s at 30 Hz, and holding at 590 ℃for 10 min. Meanwhile, the smallest size and the best primary phase can be observed.
Key words: semisolid; A356 aluminum-RE alloy; electromagnetic stirring; primary α phase; temperature field distribution
