沙漏挤压镦粗复合加工技术

本文研究了一种新的晶粒细化方法 :沙漏挤压工艺。这种工艺是在一定温度下通过对材料进行反复挤压产生大的塑性变形 ,同时进行动态再结晶而使材料得到细化。本文对铸态 Zn- Al合金进行了实验 ,初步研究了沙漏挤压工艺对于材料组织和性能的影响。实验结果表明 :沙漏挤压工艺能够有效的细化晶粒 ,使材料获得均匀的等轴细晶组织和优良的综合性能 ,并有助于实现高应变速率超塑性

EXTRUSION-UPSETTING MULTIPLE PROCESSING IN SANDGLASS

A new method of attaining ultrafine grain size has been developted,which is extrusion\|upsetting multiple processing in sandglass (EUMP).This technology is conducted at a certain temperature.The test material gets high strain during extrusion upsetting,at the same time the dynamic recrystallization happened,So the ultrafine grain size can be got.In this paper we did experiments on ingot Zn\|5%Al alloy,to find the effect of sandglass extrusion technology on the microstructures and properties of the test material.The experiment results show that sandglass extrusion technology can fine the grain size effectively,and the material after sandglass extrusion can attain fine and uniform microstructures and super mechanical properties,and can help to realize high strain rate superplasticity.