THE EFFECT OF PROCESSING SPEED ON THE MICROSTRUCTURE AND MECHANICAL PROPERTIES OF AZ31 MAGNESIUM ALLOY DURING FRICTION STIR PROCESSING
In order to investigate the effect of processing speed on microstructure and mechanical properties of AZ31 magnesium alloy,friction stir processing experiments were carried out on rolled AZ31 magnesium alloy sheet with rotation speed of 1000 r/min and pro-cessing speed of 100,200 and 400 mm/min respectively.The microstructure,hardness and tensile properties of samples at different processing speeds were analyzed by means of optical microscope,universal experimental machine and microhardness tester.The results show that the average grain size of AZ31 magnesium alloy microstructure decreases with the increase of processing speed.When the processing speed is 400 mm/min,the microstructure refinement effect of AZ31 magnesium alloy is the best.With the increase of pro-cessing speed,the microhardness of the mixing zone increases gradually,and the maximum value is 60.63 HV.When the processing speed increased from 100 mm/min to 400 mm/min,the tensile strength first increased and then decreased.When the processing speed was 200 mm/min,the tensile strength of the sample reached the maximum value of 282 Mpa,which was 22.6%higher than that of the base material.
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