Ni75Al14Mo11合金早期沉淀相场微观模拟

Microscopic Phase-field Simulation for Formation of Pre-precipitation for Ni75Al14Mo11

摘要:

利用三元微观相场动力学模型耦合弹性微观理论，模拟了973 K下，弹性应变能对Ni75Al14Mo11合金早期沉淀过程的影响。对该合金微观组织演化图、L10相体积分数、序参数及占位几率进行了分析。结果表明，该合金首先析出L10 结构相（L10(Ⅰ)/L10(Ⅱ)）。随着弹性应变能增加，2种L10 结构相的析出受到影响，弹性应变能明显抑制L10(Ⅰ)的析出。随着时效的进行，2种L10结构相最终转变为大量的L12结构沉淀相

Abstract:

Based on the microscopic phase-field dynamic model and the micro-elasticity theory, the pre-precipitation process of Ni75Al14Mo11 alloy was simulated at 973 K. The investigation of the microscopic morphology evolution figures, the change of L10 volume fraction, order parameter and occupation probability indicate that the first precipitation is L10 structure which has two variants of L10(I) structure and L10(II) structure. With the increase of the elastic strain energy, the precipitation of two L10 structures are affected, and the elastic strain energy, obviously, inhibits the formation of the L10(I) structure. At last, the two L10 structures transform to precipitation of L12 order structure