Study on microstructure characteristics of Cu-Cr in-situ composite during the non-steady unidirectional solidification
Microstructure evolvement in the incipient interim of hypoeutectic Cu-1.0wt％Cr alloy during the non-steady unidirectional solidification was observed. Effect of the non-steady unidirectional solidification on microstructure was investigated. It was found that the microstructure evolvement of hypoeutectic Cu-1.0wt％Cr alloy underwent several stages: the planar primary α phase, the whole eutectic (α+β) to the dendrite primary α phase and eutectic (α+β). Under the condition of definite GL and C0, the interface morphology and microstructure evolvement in the incipient interim all lay on the drawing rates. With the increase of drawing rates, the microstructure evolvement in the incipient interim transferred from two stages, consisting of the planar primary α phase and the whole eutectic (α+β), to one stage, being the single planar primary α phase. For the binary Cu-Cr eutectic system, if microstructure developed in the form of plane interface during the non-steady unidirectional solidification, the hypoeutectic Cu-Cr alloy could obtain the whole eutectic (α+β), otherwise the primary α phase separated out inevitably so that the ultimate microstructures were made of the dendrite primary α phase and eutectic (α+β).
Xiaoqin BI Hengzhi FU
College of Materials Science and Engineering, Henan University of Technology, Zhengzhou He’nan 45000 China State Key Lab of Solidification Processing, Northwestern Polytechnical University, Xi’an Shanx
国际会议
郑州
英文
2007-10-23（万方平台首次上网日期，不代表论文的发表时间）