Mechanical Properties of an AI-5.4%Mg-0.5%Mn-0.1%Zr Alloy Subjected to ECAP and Rolling
Superplasticity and microstructural evolution of a commercial Al-5.4%Mg-0.5% Mn-0. l%Zr alloy subjected to severe plastic deformation through equal-channel angular pressing (ECAP) and subsequent rolling was studied in tension at strain rates ranging from 1.4×10-4 to 5.6×10-2 s-1 in the temperature interval 400-550℃. The alloy had an unrecrystallized microstructure with an average crystallite size less than 5 urn. The alloy exhibited the yield strength of ~370 MPa, ultimate strength of-450 MPa and elongationto-failure of-15% at ambient temperature. In spite of small crystallite size the alloy shows moderate superplastic properties. The highest elongation-to-failures of ~450% appeared at a temperature of ~500° C and an initial strain rate of ~1.4×10-3 s-1, where the strain rate sensitivity coefficient, m, is of about 0.57. The relationship between superplastic ductilities and microstructure is discussed.
Sergey Malopheyev Alia Kipelova llya Nikulin Rustam Kaibyshev
Laboratory of Mechanical Properties of Nanostructured Materials and Superalloys,Belgorod State University,Pobeda 85,Belgorod 308015,Russia
国际会议
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)
南京
英文
815-820
2011-03-01（万方平台首次上网日期，不代表论文的发表时间）