Effect of metallographic structure on the yield strength and yield point elongation in 5754 aluminum alloy
The yield strength has a significant impact on the stamping deformation of parts,while the Lüders band severely affects the appearance of parts,which can be esti-mated by the yield point elongation in tensile tests.The effects of grain size and Mg atomic state on the yield strength and yield point elongation in 5754 aluminum alloy were investiga-ted by tensile testing machine,metallographic microscope,and conductivity meter.With the grain size increased,both of the yield strength and yield point elongation decreased,in the range of 16-26 μm.The yield strength shows a linear relationship with the grain size d to the power of-1/2,while the yield elongation shows a linear relationship with the grain size.The different cooling rates after annealing changed the states of Mg atoms in matrix.When the cooling rate became slower,the pinning effect of Mg atoms became stronger,form-ing more Cottrell atmospheres.This leads to increasing of yield strength and yield point elon-gation.
5754 aluminum alloygrain sizeMg atomyield strengthyield point elon-gation
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