Development of Ultra-Fine Grained Structure in an AI-5.4%Mg-0.5%Mn Alloy Processed by ECAP

摘要：

Microstructural changes during equal channel angular pressing (ECAP) at the temperatures of 250 and 300℃ to the strains ~4, ~8 and ~12 were studied in a coarse-grained Al-5.4%Mg-0.5%Mn-0.1%Zr alloy. At a strain of ~4, the microstructural evolution is mainly characterized by the development of well-defined subgrains within interiors of initial grains and the formation of fine grains along original boundaries. Further straining leads to increase in the average misorientation angle, the fraction of high-angle grain boundaries and the fraction of new grains. However, only at 300℃, the plastic deformation to a strain of Σε~ 12 leads to the formation of almost uniform submicrocrystalline (SMC) grained structure with an average crystallites size of～0.5 u.m. At 250℃, the microstructure remains non-uniform and consists of subgrains and new recrystallized grains. The mechanism of new SMC structure formation after ECAP is discussed.

作者: Alia Kipelova llya Nikulin Sergey Malopheyev Rustam Kaibyshev

作者单位: Laboratory of Mechanical Properties of Nanostructured Materials and Superalloys,Belgorod State University,Pobeda 85,Belgorod 308015,Russia

会议类型: 国际会议

会议名称: 5th International Conference on Nanomaterials by Severe Plastic Deformation(第五届剧烈塑性变形纳米材料国际会议)

会议地点: 南京

会议语种:英文

页码: 487-492

在线出版日期: 2011-03-01（万方平台首次上网日期，不代表论文的发表时间）