摘要
基于微观相场动力学模型,对应变诱发镍基合金粗化过程共格沉淀相的形貌不稳定性及其发展规律进行了研究。结果表明,应变能作用下,粗化过程中沉淀颗粒界面曲率发生变化,通过沿[10]方向尺寸减小与[11]方向尺寸增大,转变为方形。低应变能作用下,沉淀颗粒形貌由圆形转变为周边圆滑,边长向外凸的方形颗粒;中等应变能作用下,沉淀颗粒形貌由圆形变为边长向内凹的方形;高应变能作用下,圆形沉淀颗粒先转变为方形,再从方形颗粒中心"分裂"为2个长条状颗粒,进一步转变为双透镜形状。
The morphology instability and the development law of the coherent precipitated phase of nickel base alloys during the coarsening process induced by strain energy were studied by the microscopic phase-field. The simulation results show that there is a continuous change in the curvature of the particle interface with the strain energy increasing, which gradually transforms from the circular particle into square through the size decreasing along [10] direction and size increasing along [11] direction. Under the low strain energy, the precipitated particle changes its shape from circular to square with round comer and convex edge; under the medium strain energy, the precipitated particle changes its shape from circular to square with concave edge; under the high strain energy, the precipitated particle changes its shape from circular to square, the square particle splits into two square particles, and then to dual-lens shape .
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2013年第8期1590-1595,共6页
Rare Metal Materials and Engineering
基金
国家自然科学基金(51174168
10902086
51075335)
西北工业大学基础研究基金(NPU-FFR-JC20120222)
关键词
镍基合金
应变能
粗化
形貌不稳定性
微观相场
nickel base alloy
strain energy
coarsening
morphological instability
microscopic phase-field
