摘要
利用预先经(400±5)℃×16h均匀化处理的10mm×10mm截面的条形试样在280℃下对AZ80A铸态合金进行等通道转角挤压试验,研究了挤压路径、挤压道次和多步法挤压对晶粒细化和力学性能的影响。结果表明,ECAE8道次挤压变形可把晶粒细化到6μm以下;在一定范围内增加道次数和降低变形温度均有助于组织细化;在相同道次和挤压路径下多步法ECAE变形由于降低了后续变形温度从而获得了晶粒更加细小的镁合金。
Equal-channel angular extrusion（ECAE） experiments were conducted on AZ80 alloy ingot at 280 ℃ using bar samples with 10 mm×10 mm section.The influences of routes,pass and multi-step extrude on the grain refinement and microstructure were investigated.The results show that the grains are refined to 6 μm after 8 passes ECAE processing.The grains can be refined under certain temperature and pass.Both increasing pass number and decreasing deformation temperature contribute to refine grain.Under the same pass and route,multi-step extrusion can refine grains due to low deformation temperature.
出处
《热加工工艺》
CSCD
北大核心
2011年第3期89-91,共3页
Hot Working Technology
