Effect of deformation structure on fatigue behavior of an Al-Mg-Sc alloy

6th International Conference on Nanomaterials by Severe Plastic Deformation

材料科学;化学

Zhemchuzhnikova, Daria^1 ; Kaibyshev, Rustam^1

Belgorod State University, Pobeda 85, Belgorod 308015, Russia^1

关键词: Al-Mg-Sc alloy;    Average grain size;    Deformation structure;    Fatigue behavior;    Fatigue strength;    Initial grain size;    Solution treatments;    Static strength;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/63/1/012164/pdf
DOI  :  10.1088/1757-899X/63/1/012164

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

Effect of initial grain size on fatigue behavior of an Al-6%Mg-0.35%Mn-0. 2%Sc- 0.08%Zr-0.07%Cr alloy was examined. The initial CG microstructure with an average grain size of ∼ 22 μm was manufactured by casting followed by solution treatment at 360 °C for 12 h. To produce the UFG condition, the alloy was subjected to equal-channel angular pressing (ECAP) at 320 °C up to a total strain of ∼ 14. Extensive grain refinement provided the formation of fully recrystallized structure with an average grain size of 700 nm. It was shown that the formation of UFG structure provided +60% increases in yield stress and +25% increases in fatigue strength. Fundamentals of this effect of microstructure on the static strength, fatigue resistance and fracture modes are discussed.