Abstract：The 2024 aluminum alloy was treated by high pulsed magnetic field with different magnetic induction intensities(B) and pulse numbers(N), and the mechanical properties and electron paramagnetic resonance (EPR) spectra were determined.The results show that the variation tendency of maximum value on EPR curve is identical to elongation. Under the conditions with B of 1 T and N of 30, the maximum elongation is obtained with the largest absorption intensity in EPR spectrum, which implies a maximum number of unpaired electrons. For the optimized parameters, the magnetic field energy can satisfy the electron excitation conditions, which accelerates the increasing of unpaired electron concentration and the enhancement of alloy paramagnetism. The unpaired electrons come from the dislocation and the dislocation pinning centers of alloyed precipitates, and the structure units tend to form free radical pairs. In the presence of magnetic field, the free radicals transfer from singlet to triplet state, and the strong bonding between dislocations and pinning center correspondingly becomes weak, which facilitates the depinning of dislocations and the improvement of plasticity.
李桂荣, 李超群, 韩松, 王宏明, 程江峰. 磁场处理2024铝合金的塑性和微观机制[J]. 江苏大学学报（自然科学版）, 2019, 40(3): 344-349.
LI Gui-Rong, LI Chao-Qun, HAN Song, WANG Hong-Ming, CHENG Jiang-Feng. Plasticity and microstructure of 2024
aluminum alloy treated by magnetic physics fields[J]. Journal of Jiangsu University(Natural Science Eidtion)
, 2019, 40(3): 344-349.
2019, Vol. 40 
