摘要
A phase field model has been developed to simulate the microstructural evolution during the isothermal 尾 鈫?#xA0;蠅 phase transformation in the Zr-Nb alloys. This model captures the essential physics of a mixed diffusive-displacive mechanism that leads to 尾 鈫?#xA0;蠅 transformation, and appropriately described the microstructural evolution and transformation kinetics. The Nb rich layers around the 蠅 particles can develop to a net shape structure, which results in the change of 蠅 morphology and the existence of stabilized 蠅 + 尾 microstructure with small 蠅 particles homogeneous distribute in the 尾 matrix.