镍铝合金γ'沉淀相微观组织演化的相场模拟  

Phase-field Simulation of Microstructural Evolution of γ' Precipitates in Binary Ni-Al Alloys

作　　者：梅浩杰[1] 李永胜[1] 胡凯[1] 周晓荣[1] 闫志龙[1] MEI Haojie;LI Yongsheng;HU Kai;ZHOU Xiaorong;YAN Zhilong(School of Materials Science and Engineering,Nanjing University of Science and Technology,Nanjing 210094,china)

机构地区：[1]南京理工大学材料科学与工程学院,江苏南京210094

出　　处：《机械制造与自动化》2018年第1期43-46,共4页Machine Building & Automation

摘　　要：通过建立Ni-Al合金微观相场动力学模型,对镍基合金沉淀相的形核和长大过程中的形貌变化及生长规律进行了研究。研究结果表明,沉淀相颗粒形核初期为球形,由于应变能的作用,沉淀相长大到一定阶段变为球形立方体。Ni-18at.%Al沉淀相和基体的Al浓度分别为c_(Al)=0.25%,c_(Al)=0.095(at.%)。通过观察沉淀相长大过程的形貌,发现沉淀相是从球形立方体的边缘向内部以层状的方式长大的。The microstructural evolution and growth ofγ′precipitates(Ni 3 Al with L1 2 structure)in the binary Ni-Al alloys is studied by means of the phase-field approach.Research result indicates that the morphology ofγ′precipitates is spherical at the stage of nucleation,then it grows into cube at a certain stage due to the effect of strain energy.The Al composition ofγ′precipitates andγmatrix is c Al=0.25%and c Al=0.095(at.%),respectively.It is found thatγ′precipitates grow up from the edge to the center on the cube.

关 键 词：镍铝合金 微观组织演化 相场模拟 沉淀相 

分 类 号：TH142[一般工业技术—材料科学与工程]