SPD-lnduced Grain Boundary Segregations and Superior Strength in UFG Al Alloys

摘要：

Two Al alloys (AA1570 and AA6061) in the solutionized state have been processed by HPT at room temperature to achieve a homogeneous UFG structure. After HPT, the grain size was found to have a mean value about 100 nm for both alloys. Measured yield stress values of HPT-produced UFG alloys being plotted in terms of the Hall-Petch relationship were found to exceed the plot predictions for the range of ultrafine grain size. For both alloys, Atom Probe Tomography measurements allowed to reveal segregation of solute elements along grain boundaries. The origin of the extremely high strength of the alloys nanostructured by HPT is discussed with a special attention to the influence of such segregations on the emission and the mobility of dislocations.

作者: Nariman A.Enikeev Maxim Yu.Murashkin Xavier Sauvage Vil U.Kazykhanov Ruslan Z.Valiev

作者单位: Institute of Physics of Advanced Materials,Ufa State Aviation Technical University,12 K.Marx St.,Ufa,450000,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: 665-669

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）