There have been many experiments and theoretical studies of primary dendrites, and most of which have focused on the effects of extrinsic factors such as solidification rate and temperature gradient. However, intrinsic factors such as the kind of solute element and initial solute concentration are also considered to be important for controlling the spacing of primary dendrites.In this study, the effects of intrinsic factors on primary and secondary arm spacings of dendrites were investigated, and changes in a microsegregation index with changes in primary arm spacings and equilibrium distribution coefficient of each solute element were also examined. Fe-Cr-C, Fe-C-Cr, Fe-C-Cr-Mo, Fe-C-Cr-Mo-V and Fe-C-Cr-Mo-V-W alloys were solidified unidirectionally and water-quenched. The primary arm spacing increased with increase in initial solute concentration in all alloys because the range of solidification temperature increased with increase in solute concentration. On the other hand, the secondary arm spacing in all alloys decreased with increase in initial solute concentration, and it was proportional to about the one-third root of local solidification time. The microsegregation index increased with increasing primary arm spacing and with decreasing equilibrium distribution coefficient. Wirkung von gelosten Elementen auf den primaren und sekundiren Dendritenabstand inEisen-Basis-Legierungen. Es gab bereits viele Experimente und theoretische Studien Ober prims.re Dendriten, wobei sich die meisten Untersuchungen auf die Wirkung extrinsischer Faktoren wie Erstarrungsgeschwindigkeit und Temperaturgradient konzentrierten. Jedoch werden auch intrinsische Faktoren wie Art und Konzentration der gelosten Elemente als wichtige EinflussgroBen fur den primaren Dendritenabstand angesehen. In dieser Studie wurde die Wirkung intrinsischer Faktoren auf den primaren und sekundaren Dendritenabstand erforscht. Auch Veranderungen im Mikroseigerungs-lndex durch Anderungen des primaren Dendritenabstands und des Gleichgewichts-Verteilungskoeffizienten jedes gelosten Elementes wurden untersucht. Fe-Cr-C-, Fe-C-Cr-, Fe-C-Cr-Mo-, Fe-C-Cr-Mo-Vund Fe-C-Cr-Mo-V-W-Legierungen wurden zur eindimensionalen Erstarrung gebracht und in Wasser abgeschreckt. Der primare Dendritenabstand vergroBerte sich mil der Erhohung der Konzentration der gelosten Elemente. Andererseits nahm der sekundare Dendritenabstand mit dem Anstieg der Anfangskonzentation der gelosten Elemente ab. Er verhielt sich proportional zur dritten Wurzel der lokalen Erstarrungszeit. Der Mikroseigerungs-lndex stieg mit zunehmendem primarem Dendritenabstand und mit abnehmendem Gleichgewichts-Verteilungskoeffizienten an.
The dopant diffusion, electrical activation, diode I-V characteristics and damage recovery of BF 2 , Ga and In implanted Si after annealing have been investigated for samples with the peak concentration of 1.0x10 19 cm-3 as p-type dopant atoms. Within this concentration, Ga implanted samples have the low sheet resistance and lowest leakage current in diode I-V with good crystallinity.
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