中南大学学报（自然科学版）2013，Vol.44Issue(2)：493-500,8.
电场对2E12铝合金时效微观组织和动力学的影响
Effect of electric field on microstructure and kinetics in aging of 2E12 aluminum alloy
摘要
Abstract
The effect of electric field on the microstructure and aging kinetics of 2E12 aluminum alloy was investigated by differential scanning calorimetry (DSC), transmission electron microscopy (TEM) and resistivity measurement. The results show that the continued aging of 190 ℃, 5 h aged pre-deformed 2E12 aluminum alloy is promoted by applied electric field. The S phase formation peak in DSC curve is reduced by 15 ℃, the maximum phase transition rate is increased by 75% and the time required for completion of phase transition is reduced by 20%. The formation energy of Al vacancies is reduced by 26% and the density of Al vacancies is increased with the effect of electric field, which causes the volume fractions and sizes of S' phase particles to increase. The dislocation density in aged sample keeps a higher lever due to the retard, which is caused by the particles, of the reducing process of the dislocation density in matrix during recovery. With the influence of dislocations and vacancies, the formation of S phase during continued aging process is promoted.关键词
2E12铝合金/电场/时效动力学/析出相/空位/位错Key words
2E12 aluminum alloy/ electric field/ aging kinetics/ precipitate/ vacancy/ dislocation分类
矿业与冶金引用本文复制引用
洪天然,易丹青,周明哲,王宏伟,丁珣..电场对2E12铝合金时效微观组织和动力学的影响[J].中南大学学报（自然科学版）,2013,44(2):493-500,8.基金项目
国家自然科学基金资助项目(51071177) （51071177）
