It is firstly found that for alloys in metastable region , with enhancement of atomic interaction energy , volume fraction and density of " phase particulate are increased , size and nucle ' ation rate of ordered phase raised , decline pace of composition in disordered matrix around the order phase is accelerated , composition order parameter and long range order parameter of ordered phase increased , i . e . process of clustering and ordering are accelerated 首次發(fā)現(xiàn),隨著原子間相互作用勢的增加,亞穩(wěn)區(qū)合金中有序相的體積分?jǐn)?shù)和顆粒密度有所增加,有序相的尺寸和形核率有所提高,有序相周圍的無序基體濃度的降低有所加快,有序相內(nèi)的成分序參數(shù)和長程序參數(shù)有所提高,即促進(jìn)了原子簇聚過程和有序化程度。
No incontinuous transition has been found at mean - field spinodal lines and the transition of precipitation mechanism transform gradually across the mean - field spinodal lines . precipitation mechanism at disordering instability line is non - classical nucleation and growth , similar to those in metastable region , and precipitation mechanism at ordering instability line is non - classical nucleation and growth , followed by spinodal decomposition , similar to those in instable region 在不同的區(qū)域,粗化有不同的表現(xiàn)形式:在亞穩(wěn)區(qū),與(形核)長大交疊;在失穩(wěn)區(qū),與失穩(wěn)分解交疊;在過渡區(qū),與長大和失穩(wěn)分解混合機(jī)制交疊。