不同快压射速度对镁合金真空压铸件成形质量的影响  

Influence of Different Rapid Injection Velocity on Forming Quality of Magnesium Alloy Vacuum Die Casting

作　　者：陈思涛[1] 宋东福 戚文军 周峰 Chen Sitao;Song Dongfu;Qi Wenjun;Zhou Feng(Intelligent Manufacturing College,Foshan Polytechnic,Foshan 528137;Institute of New Materials,Guangdong Academy of Sciences,Guangzhou 510640)

机构地区：[1]佛山职业技术学院智能制造学院,佛山528137 [2]广东省科学院新材料研究所,广州510640

出　　处：《特种铸造及有色合金》2024年第1期127-130,共4页Special Casting & Nonferrous Alloys

基　　金：广东省高校青年创新人才资助项目(2020KQNCX210);广东省自然科学基金资助项目(2018A030313287)。

摘　　要：以AZ91D镁合金为研究对象,采用自主设计的真空抽气系统进行3组真空压铸试验,研究不同快压射速度对真空压铸件力学性能及组织的影响。结果表明,该真空抽气系统制得的压铸件外形完整,力学性能优于普通压铸件。当快压射速度为3 m/s时,压铸件表面容易形成冷隔和流痕且内部组织存在多处缩松、缩孔;当快压射速度为5 m/s时,压铸件则容易出现飞边且内部组织存在多处缩孔;当快压射速度为4 m/s时,压铸件外形完整且内部只有少许缩孔,此时散热片的抗拉强度为226 MPa,伸长率为5.4%。Three groups of vacuum die-casting experiments for AZ91D magnesium alloy were carried out with a selfdesigned vacuum pumping system to investigate the effects of different rapid injection speeds on the mechanical properties and microstructure of vacuum die-casting parts. The results indicate that the die castings fabricated by the vacuum pumping system exhibit complete shape and the better mechanical properties than ordinary die castings. When the rapid injection speed is 3 m/s, the surface of the die castings is easy to form cold shut and flow marks, and there are many shrinkage porosity and holes in the microstructure. When the rapid injection speed is 5 m/s, the die castings are prone to flash and there are many shrinkage holes in the microstructure. When the rapid injection speed is 4 m/s, the diecastings have a complete shape with a few shrinkage cavities in the microstructure. The tensile strength and the elongation of the heat sink reach up to 226 MPa and 5. 4%, respecively.

关 键 词：镁合金 工艺参数 真空压铸 

分 类 号：TG249.2[金属学及工艺—铸造] TG146.22[一般工业技术—材料科学与工程]