Rapid dendritic growth kinetics of primary phase within supercooled Zr-V alloy at electrostatic levitation state
简介：The liquid Zr100-xVx(x=8.6,16.5,30)alloys were undercooled to the maximum undercooling of 364 K(0.18 TL),405 K(0.21 TL),and 375 K(0.21 TL),respectively,by using electrostatic levitation technique.The Zr91.4V8.6 and Zr83.5V16.5 alloys present only one recalescence during liquid/solid phase transition,while the Zr70V30 alloy presents a transformation from two recalescence to one recalescence phenomenon with a critical undercooling of approximately 300 K.According to the LKT/BCT model,the calculated results of the primary β-Zr dendrite growth velocity in undercooled liquid Zr91.4V8.6 and Zr83.5V16.5 alloys agree well with the experiments.The velocity inflection points at 119 K of Zr91.4V8.6 alloy and 201 K of Zr83.5V16.5 alloy could be explained by the competition between solutal undercooling control and thermal under-cooling control modes.For Zr70V30 alloy solidified in the P1 with twice recalescence,a critical second undercooling of 253 K and corresponding undercooling of 65 and 244 K are obtained.When the un-dercooling is in the range of 65-244 K,the second undercooling would be greater than 253 K,and the residual liquid phase would solidify into anomalous eutectic microstructure for Zr70V30 alloy.The Vickers hardness of Zr100-xVx(x=8.6,16.5,30)alloys all show a quadratic relationship with undercooling.Under electrostatic levitation condition,the mechanical property of Zr-V alloys could be significantly regulated through solidifying the alloys at different undercoolings.展开
学者：C.H.ZhengD.N.LiuH.LiaoL.HuH.P.Wang
关键词：UndercoolingZr-V alloyElectrostatic levitationsolidificationHypoeutecticdendriteGrowth kinetics
在线出版日期：2025-03-06 （网站首发日期）
