摘要
将静电场时效处理应用于GH4169镍基高温合金,以研究静电场对合金内部点缺陷的影响.结果表明：500℃无电场时效处理所提供的能量不足以使一些处在正常点阵位置上的原子跳出能垒而形成新的单空位,但可促进大量处于畸变位置上和邻近空位的原子实现再次的跃迁.强静电场的施加使合金内部不带电原子产生梯度力,加速了原子的振动.在600,700和800℃时效20 h过程中施加8 kV/cm强静电场,其平均正电子湮没寿命提高6%~7%,增大了合金内部平均空位尺寸.
In order to investigate the effect of electric field on point defects,an external electric field was applied to GH4169 superalloy during aging at different temperatures.The results indicated that the energy provided by thermal aging at 500 ℃ without electric field is not enough to promote the atoms jump out of the normal lattice position and form new monovacancies,but it can promote the atoms at lattice distortion position and adjacent to vacancy to jump again.The gradient force has been produced on uncharged atoms by intense electric field applied,which can enhance atomic thermal vibration.The average positron annihilation lifetime increases by 6%~7% when the alloy aged at 600,700 and 800 ℃ with 8 kV/cm intense electric field,leading to the increasing of average size of vacancy in the alloy.
出处
《东北大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2011年第12期1733-1736,共4页
Journal of Northeastern University(Natural Science)
基金
国家重点基础研究发展计划项目(2010CB631203)
中央高校基本科研业务费专项资金资助项目(N100602002)
教育部2010年博士研究生学术新人奖(22002096)
