摘要
利用三元微观相场动力学模型,结合原子图像、序参数和体积分数等手段模拟研究了Ni75Al9Cr16合金在973K下的时效行为。结果表明,合金沉淀过程中析出DO22和L12两种有序相。DO22相的早期沉淀机制为失稳分解,L12相的早期沉淀机制为非经典形核长大。DO22相首先从无序固溶体中析出,随后L12相在DO22相的畴界处析出。平衡时,获得的DO22相体积分数略小于L12相的体积分数。
The aging behavior of Ni75Al9Cr16 alloy at 973 K was simulated by using ternary microscopic phase-field, combining atomic pictures, order parameter and volume fraction. The results show that DO22 and L12 ordered phase are formed. The precipitation mechanism of DO22 phase is spinodal decomposition, and the precipitation mechanism of L12 phase is non-classical nucleation and growth. DO22 phases first appeared in random solid solution, and then L12 phase is formed in the edge of DO22 phase. When equilibrium is reached, the volume fraction of L12 phase is larger than that of DO22 phase.
出处
《热加工工艺》
CSCD
北大核心
2008年第8期80-83,共4页
Hot Working Technology
基金
国家自然科学基金资助项目(50671084)
西北工业大学研究生种子基金资助项目(Z200714)
