Dynamic scaling behaviour of late-stage phase separation in Ni75AlxV25-x alloys

• 来源期刊: 中国物理（英文版）
• 关键词: phase separation dynamic scaling elastic interaction microscopic phase-field simulation
• 年，卷（期）: 2007,（3）
• 页码范围: 854-861
• 页数: 8页
• 语种: 英文

摘要

The dynamic scaling behaviour of late-stage phase separation and coarsening mechanisms of Ll2 and DO22 in Ni75A1xV25-x(3≤x≤ 10,at.%) alloys are studied using the microscopic phase-field dynamic model.The microelasticity field is incorporated into the diflusion dynamic model.The results show the morphology and coarsening dynamics being greatly changed by the elastic interactions among different precipitates,the particles aligning along the dominant directions,the average domain size (ADS) of Ll2 and DO22 deviating from the exponent of temporal power-law,and the growth slowing down due to the increasing of elastic interactions.The dynamic scaling regime of late-stage coarsening of the precipitates is attained.Thus the scaling behaviour of structure function is also applicable for elastic interaction systems.It is also found that the variations of ADS and scaling function depend on the volume fraction of precipitates.