HOMOGENEOUS NUCLEATION KINETICS OF AL3SC IN A DILUTE AL-SC ALLOY

被引：146
|
作者：
HYLAND, RW
机构：
来源：
METALLURGICAL TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE | 1992年 / 23卷 / 07期
关键词：
D O I：
10.1007/BF02647542
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The homogeneous nucleation kinetics of the Ll2 Al3Sc phase in the face-centered cubic (fcc) matrix of an Al-0.11 at. pct Sc alloy were measured at 561 and 616 K using the isothermal transformation technique and transmission electron microscopy (TEM). Applying classical homogeneous nucleation theory in conjunction with available thermodynamic data, an average interphase boundary energy of about 94 +/- 23 mJ/m2 was estimated from the nucleation rate data. This energy was found to vary weakly with temperature. The effects of heat-treatment technique (isothermal transformation vs quench and age) on nucleation kinetics indicate that quenched-in vacancies may influence nucleation kinetics primarily by increasing the interdiffusion of Sc in Al.
引用
收藏
页码：1947 / 1955
页数：9
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