【作者】 马荣； 陈冬； 唐清富； 任志勇； 邬军； 苏斌； 王震宏； 罗超；

【Author】 MA Rong;CHEN Dong;TANG Qing-fu;REN Zhi-yong;WU Jun;SU Bin;WANG Zhen-hong;LUO Chao;China Academy of Engineering Physics;

【机构】 中国工程物理研究院；

【摘要】 铀铌合金中铌的分布对基体组织结构影响明显,传统电弧熔炼所制样品中可能存在一定程度的铌偏析,而这种偏析给后续组织转变研究带来潜在干扰因素。为了探究溶质铌偏析的主要控制因素,以制备获得成分较均匀的铀铌合金,本文采用真空吸铸和甩带两种方法制备了铀铌合金,并对其进行了光学显微镜、扫描电子显微镜及能谱表征分析,以获得铸态样品中溶质铌的分布特征,了解冷却速率对铸态样品中铌分布特征的影响。初步试验结果表明提高冷却速率可使溶质铌分布更均匀,同时使铸态晶粒细化至几微米。更多还原

【Abstract】 The microstructure of U-Nb alloy is susceptibility to solute distribution,while niobium(Nb) segregation which may impact the aging behavior is often observed in traditional vacuum arc remelted(VAR) castings.In order to research the origin of the segregation and obtain homogeneous sample,this work focused on effect of cooling rates on distribution of Nb in matrix of ingots prepared by suction casting or melt spinning,respectively.The as-cast microstructure examination were carried out with optical microscopy(OM),scanning electron microscope(SEM)and energy dispersive spectroscopy(EDS).The results indicate that increase of cooling rate reduces the micro-segregation of Nb,and fine grains is obtained by rapid solidification processing.更多还原