摘要
通过在浇注时引入机械搅拌制备了Mg-4Al-2Sn-0.1Y镁合金,并进行了显微组织、物相组成和电磁屏蔽性能的测试与对比分析。结果表明,与常规铸造相比,机械搅拌铸造可使镁合金组织更细小、致密,具有更佳的电磁屏蔽性能;铸锭中心处的平均晶粒尺寸减小66%;当频率分别为300、900、1500 MHz时,合金电磁屏蔽效能分别提高15.8%、26.5%、54.2%;但合金的相组成不变,都是由α-Mg基体和少量的Mg17Al12及Mg2Sn相组成。
Mg-4Al-2Sn-0.1Y magnesium alloy cast ingots were prepared by mechanical stir-assisted pouting. And the microstructure, phase composition and electromagnetic shielding effectiveness were tested. The results show that compared with common casting, mechanical stir-assisted casting could make the microstructure smaller and compacter and improve the electromagnetic shielding effectiveness of the alloy. Moreover, the mechanical stir could make average grain size decrease by 65.8%, and make electromagnetic shielding effectiveness at the efficiency of 300MHz, 900MHz, and 1500MHz increase by 15.8%, 26.5%, and 54.2%, respectively. But the phase composition is the same by the two methods and the alloy is both composed of α-Mg phase and a spot of Mg17Al12 phase and Mg2Sn phase.
出处
《热加工工艺》
CSCD
北大核心
2015年第7期105-107,共3页
Hot Working Technology
