摘要
研究了挤压工艺(挤压温度、冷却介质)及变形量对AZ31镁合金型材组织结构及性能(抗拉强度和电导率)的影响,探讨了最佳工艺生产条件。研究结果显示,在挤压变形过程中,孪晶以周期性的形式出现在晶体中,挤压温度低、变形量大及冷却强度大均有利于孪晶的生成。随挤压温度升高,挤压力降低;变形量增加及水冷有利于材料的强度提高;挤压工艺条件的改变对镁合金材料的电导率影响小。挤压温度为400℃,挤压比为14.5,经水冷却得到的镁合金型材具有良好的抗拉强度(272.2MPa)和电导率(10.07MS/m)。
Effects of extruded process, such as extruded temperature and cooling rate, and deformation rate on microstructure and properties of AZ31 magnesium alloy were investigated to optimize processing parameters. The results indicate that the mechanical properties and microstructure of the AZ31 magnesium alloy are relavant with to extruded temperature, deformation rate and cooling rate. Twin-crystal periodically exists in the structure of the AZ31 alloy during extrusion process, and it is helpful for the creation of twin-crystal in the structure with low extruded temperature and deformation rate as well as high cooling rate. Extruded force is decreased with increasing in extruded temperature, and the strength of the alloy can be improved with rising deformation rate in case of water cooling. Meanwhile, slight effects of varied extrusion parameters on electronic conductivity can be observed. The tensile strength and electronic conductivity of the alloy are 272.2 MPa and 17.3 MS/m, respectively, with extruding at 400 ℃ and extruding rate of 14.5 in the condition of water cooling .
出处
《特种铸造及有色合金》
CAS
CSCD
北大核心
2008年第10期748-750,共3页
Special Casting & Nonferrous Alloys
基金
江西省自然科学基金资助项目(0650044)
关键词
AZ31镁合金
挤压
工艺参数
组织
AZ31 Magnesium Alloy, Extrusion, Processing Parameters, Microstructure
