The effect of electric potential on the fracture surface of aluminum under creep tests

About the authors:

Oxana A. Stolboushkina, Assistant Lecturer of Physics Department, Siberian State University of Industry
Tang Guoyi, Executive Director of Advanced Materials Institute, Graduate School at Shenzhen, Tsinghua University, Professor
Guolin Song, Associate Professor, Chief of the Laboratory of Microstructure Analysis, Advanced Materials Institute, Graduate School at Shenzhen, Tsinghua University
Sergey V. Konovalov, Associate Professor, Department of Physics, Siberian State University of Industry, Cand. Tech. Sci.
Viktor E. Gromov, Head of Physics Department, Siberian State University of Industry, Professor, Dr. Phys. and Math. Sci.

Abstract:

In the present study fracture surface analysis was performed under creep tests of pure aluminum with applied electric potential of 1V, 5V, as well as without electrical action. For this investigation a scanning electron microscopy method was used. In research a negative effect of the electric potential on creep performance resulting in a creep rate increase and material durability reduction has been discovered. It has been found out that application of electic potential to the surface of the samples of pure aluminum under creep test leads to quantitative changes of the parameters the fracture structure is characterized by. It is demonstrated that application of electric potential up to 5 V is accompanied by pits of fracture of wide range of sizes and consequently by fracture viscosity reduction upon creep testing, as well as test time reduction. All this can cause premature failure of the item in service when electric potential is applied.

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