Effects of Self Resistance Heating Temperature on Mechanical Properties and Microstructure of 5052 Aluminum Alloy Plates
The effects of self resistance heating temperature on the mechanical properties,microstructure and fracture morphology of 5052 aluminum alloy plate were studied by scanning electron microscope,microhardness tester and self resistance heating tensile test.The results show that the tensile strength,microhardness,product of strength and ductility and deformation resistance of 5052 aluminum alloy plate are largest and the elongation is smallest at 25℃.With the increase of self resistance heating temperature,the tensile strength,microhardness,product of strength and ductility and deformation resistance of 5052 aluminum alloy plate decreases,and the elongation increases.At 350℃,the elongation is 26%and the tensile strength is 87 MPa.The fracture surface has obvious dimples,the self resistance heating temperature ranges from 200 ℃ to 350℃,and there are a few traces of fusing on the fracture surface.The fracture morphology shows that the ductile fracture is obvious with the increase of temperature.The number of dimples increases gradually,the depth of dimples increases and the plasticity increases from 200 ℃ to 300℃.With the increase of self resistance heating temperature,the β phase melting into the matrix increases,β phase reduces.The β phase distribution is more and more uniform,the fiber structure gradually reduces and the plasticity improves.
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