规则共晶初始过渡区非稳态扩散场与形态演化  

NON-STEADY STATE DIFFUSION FIELD AND PATTERN EVOLUTION IN INITIAL TRANSITION PROCESSING OF REGULAR EUTECTIC GROWTH

作　　者：姚向东[1] 黄韬[2] 周尧和[2] 

机构地区：[1]中国科学院金属研究所西北工业大学,沈阳市110015 [2]西北工业大学

出　　处：《材料科学进展》1993年第4期321-326,共6页

基　　金：国家自然科学基金;9589014

摘　　要：通过求解时间相关的非稳态扩散方程,详细分析了共晶强制生长初始过渡过程并导出其非稳态溶质扩散场,发现生长速度 V 是初始过渡区溶质分配的最主要影响因素,其次为共晶相间距λ、溶质扩散系数 D 等系统参量,透明共晶系 CBr_4-11.1wt-%C_2Cl_6实验证实了理论分析的规律。Considering initial transition processing is important in studying pattern selec-tion because the non-linear dynamic conduct is dependent upon early stage and path in crystalgrowth processing.The initial transition processing has been analysed in detail and non-steadystate diffusion field has been reduced by solving the time-dependent diffusion equation.It isfound that growth velocity plays the most principal role in solute redistribution of the initialtransition processing,and interlamellar spacing,diffusion coefficient and other physicalparameters make less important.Experiments by using transparent organic model alloyCBr_4-11.1wt-%C_2Cl_6 have been carried out for testifying and indicating the true of the theory.

关 键 词：非稳态扩散场 晶体生长 合金 

分 类 号：TG131[一般工业技术—材料科学与工程]