中国有色金属学报（英文版）
中國有色金屬學報（英文版）
중국유색금속학보（영문판）
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
2012年
4期
895-900
,共6页
转变动力学%各向异性生长%阻碍效应%Avrami指数
轉變動力學%各嚮異性生長%阻礙效應%Avrami指數
전변동역학%각향이성생장%조애효응%Avrami지수
transformation kinetics%anisotropic growth%blocking effect%Avrami exponent
基于对颗粒各向异性生长引起阻碍效应的几何概率分析,研究生长各向异性效应对固态相变动力学的影响.结果表明:阻碍效应导致生长速率降低,进而导致Avrami指数的规律变化.根据先前的解析模型,推导动力学参数Avrami指数和总有效激活能的解析表达.各向异性效应对相变的影响不仅取决于非阻碍因子y,还取决于阻碍级数k.各向异性效应直接作用在颗粒生长维度上,却不影响转变过程的总有效激活能.考虑到各向异性生长所引起的阻碍效应与转变分数的演化,发现各向异性效应在相变过程中期最为剧烈.
基于對顆粒各嚮異性生長引起阻礙效應的幾何概率分析,研究生長各嚮異性效應對固態相變動力學的影響.結果錶明:阻礙效應導緻生長速率降低,進而導緻Avrami指數的規律變化.根據先前的解析模型,推導動力學參數Avrami指數和總有效激活能的解析錶達.各嚮異性效應對相變的影響不僅取決于非阻礙因子y,還取決于阻礙級數k.各嚮異性效應直接作用在顆粒生長維度上,卻不影響轉變過程的總有效激活能.攷慮到各嚮異性生長所引起的阻礙效應與轉變分數的縯化,髮現各嚮異性效應在相變過程中期最為劇烈.
기우대과립각향이성생장인기조애효응적궤하개솔분석,연구생장각향이성효응대고태상변동역학적영향.결과표명:조애효응도치생장속솔강저,진이도치Avrami지수적규률변화.근거선전적해석모형,추도동역학삼수Avrami지수화총유효격활능적해석표체.각향이성효응대상변적영향불부취결우비조애인자y,환취결우조애급수k.각향이성효응직접작용재과립생장유도상,각불영향전변과정적총유효격활능.고필도각향이성생장소인기적조애효응여전변분수적연화,발현각향이성효응재상변과정중기최위극렬.
Based on the statistical analysis of blocking effect arising from anisotropic growth,the anisotropic effect on the kinetics of solid-state transformation was investigated.The result shows that the blocking effect leads to the retardation of transformation and then a regular behavior of varying Avrami exponent.Following previous analytical model,the formulations of Avrami exponent and effective activation energy accounting for blocking Effect were obtained.The anisotropic effect on the transformation depends on two factors,non-blocking factor γ and blocking scale k,which directly acts on the dimensionality of growth.The effective activation energy is not affected by the anisotropic effect.The evolution of anisotropic effect with the fraction transformed is taken into account,showing that the anisotropic effect is more severe at the middle stage of transformation.
