定向凝固Cu-0.33Cr-0.1Ti亚共晶合金中带状组织的形成机理  

Formation Mechanism of Band Structure in Directionally Solidified Cu-0.33Cr-0.1Ti Hypoeutectic Alloy

作　　者：李勇 朱靖 王莹 李焕 赵亚茹 LI Yong;ZHU Jing;WANG Ying;LI Huan;ZHAO Yaru(Institute of Engineering Research,Jiangxi University of Science and Technology,Ganzhou 341000)

机构地区：[1]江西理工大学工程研究院,赣州341000

出　　处：《材料导报》2018年第4期602-605,共4页Materials Reports

基　　金：国家自然科学基金(51561007;51261007);江西省自然科学基金(20161BBM26036);江西理工大学青年英才支持计划资助

摘　　要：考察了Cu-0.33Cr-0.1Ti亚共晶合金在凝固速率为20μm/s下的定向凝固组织,利用SEM和EDS对带状组织的形貌和成分进行了分析,并从动力学、形核条件等方面探讨了带状组织形成的原因和机理。结果表明,该带状组织是由单相胞状α-Cu相与(α-Cu)+(β-Cr)共晶组织交替生长形成,带状组织的产生与定向凝固界面前沿的溶质分布有关,即主要受溶质浓度、有效溶质系数和凝固速率等因素的影响。The directional solidification structures of the Cu-0.33Cr-0.1Ti hypoeutectic alloy at solidified rate of 20μm/s were investigated.The morphology and composition of the band-like microstructure were analyzed by means of SEM and EDS.The reason and mechanism of formation of band-like microstructure were discussed based on the dynamics,nucleation conditions.The results showed that the band-like microstructures were formed by the alternation of the monocrystallineα-Cu phase and the(α-Cu)+(β-Cr)eutectic structure.The formation of the band-like microstructure was related to the solute distribution at the front of solid-liquid interface,which was mainly affected by solute concentration,effective solute coefficient and solidification rate and other factors.

关 键 词：定向凝固 Cu-0.33Cr-0.1Ti 亚共晶合金 带状组织 溶质分布 

分 类 号：TG113.12[金属学及工艺—物理冶金]