THE EFFECTS OF COLD EXTRUSION ON GRAIN SIZE REFINEMENT AND PLASTICITY FOR MAGNESIUM ALLOY
It is well-known that the plasticity of magnesium and magnesium alloy is too low to be processed at low temperature. After normal hot extrusion, the plasticity of magnesium alloy can be improved, but not noticeably. In this paper, cold extrusion of commercial AZ31 magnesium alloy with severe plastic deformation was performed at room temperature with various extrusion ratios from 2:1 to 12.5:1 in order to refine the grain size of AZ31 magnesium alloy. Finally the grain size between 2～3 μm was obtained. And the influence of different grain size on the plasticity was further investigated. And the elongation of the initial billet with the grain size of 300 μm whose elongation is about 10.4％. After extrusion at room temperature with different extrusion ratios, the average grain size can be refined to below 10 μm, and the plasticity increased to 24％～30％. In order to study the effect of plasticity of AZ31 magnesium alloy under different processing techniques, we study the correspondence between plasticity and crystalline size at the same time. All results proved that, the increase in elongation could be mainly attributed to refining of the grain size of the magnesium crystalline. It also showed that, when the average grain size of AZ31 magnesium alloy was below 5 μm, the plasticity increased noticeably by cold extrusion.
AZ31 magnesium alloys cold eztrusion refinement plasticity
Yang Yu Erde Wang
School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, P.R.China
国际会议
第五届先进材料与加工国际会议(Fifth International Conference on Advanced Materials and Processing ICAMP-5)
哈尔滨
英文
821-825
2008-09-03（万方平台首次上网日期，不代表论文的发表时间）