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基于相场法,以第二相颗粒平衡体积分数不同的合金为对象,研究第二相颗粒的沿晶析出、长大及其对基体相晶界的钉扎作用。结果表明,第二相颗粒的平衡体积分数越大,其形核孕育期越短,形核与粗化的速度也越快;然而在第二相颗粒的长大阶段,平衡体积分数较大(15%～25%)时第二相颗粒长大速度较慢,而平衡体积分数较小(10%)时则长大速度较快。随着第二相颗粒平衡体积分数的增大,其对晶界的钉扎作用也逐渐增强,但平衡体积分数增大到一定程度,钉扎作用将趋于稳定。第二相颗粒对晶粒极限尺寸的影响遵循Zener关系。
Based on the phase-field method, the second-phase particles with different volume fractions of the second-phase particles were studied for the intergranular precipitation, growth and pinning of the second-phase particles. The results showed that the larger the equilibrium volume fraction of the second phase particles, the shorter the nucleation period and the faster the nucleation and coarsening. However, when the second phase particles grew up, the equilibrium volume fraction was larger 15% ~ 25%), the second phase particles grew slowly, while the smaller the equilibrium volume fraction (10%) grew faster. With the increase of the equilibrium volume fraction of the second phase particles, the pinning effect on the grain boundaries gradually increases, but the equilibrium volume fraction increases to a certain extent, and the pinning effect will tend to be stable. The influence of second-phase particles on the grain size limit follows the Zener relationship.