Co-Ge相图的实验研究  

Experimental investigation of Co-Ge system phase diagram

作　　者：李晗[1] 刘树红[2] 杜勇[2] 

机构地区：[1]中南大学材料科学与工程学院,长沙410083 [2]中南大学粉末冶金国家重点实验室,长沙410083

出　　处：《粉末冶金材料科学与工程》2016年第1期1-7,共7页Materials Science and Engineering of Powder Metallurgy

基　　金：国家重点基础研究发展规划(973计划)资助项目(2011CB610401;2014CB644000);中德中心项目(GZ755)

摘　　要：采用电弧熔炼法制备8个不同Ge含量的Co-Ge二元合金铸锭,利用扩散炉对不同成分的合金分别在不同温度下进行退火。通过利用X射线衍射(XRD)、电子探针显微分析(EPMA)和差示扫描量热法(DSC)对铸态和退火态合金进行分析,更新该体系零变量反应温度和液相线数据。结果表明:在600℃下有Co3Ge相生成,在600℃和500℃下均未发现Co5Ge2相。在600℃和700℃下,βCo5Ge3与CoGe两相平衡,没有观察到η相。Eight kinds of Co-Ge alloys with different compositions were prepared by arc-melting and annealed at different temperatures in a diffusion furnace. The as-cast and annealed alloys were examined using XRD, EPMA and DSC. The temperatures of invariant reactions and liquidus were re-determined. The results show that the Co3 Ge phase is found to be stable at 600 ℃.The Co5Ge2 phase reported in literature does not form at 600 and 500 ℃. At 600 and 700 ℃, the βCo5Ge3 phase and the Co Ge phase are in equilibrium and no η phase is observed.

关 键 词：Co-Ge合金 相图测定 X射线衍射 示差扫描量热法 电子探针显微分析 

分 类 号：TG113.14[金属学及工艺—物理冶金]