Ni-Si共晶的标准生成焓估算及晶体生长机理研究  

Estimation of Standard Enthalpy of Ni-Si Eutectic Alloy and Study on Crystal Growth Mechanism

作　　者：崔春娟[1] 杨猛[1] 杨程[1] 田露露[1] 问亚岗 CUI Chunjuan YANG Meng YANG Cheng TIAN Lulu WEN Yagang(School of Metallurgical Engineering,Xi＇an University of Architecture and Technology, Xi＇an 710055, China)

机构地区：[1]西安建筑科技大学冶金工程学院,陕西西安710055

出　　处：《热加工工艺》2017年第2期113-115,共3页Hot Working Technology

基　　金：国家自然科学基金资助项目(51201121);陕西省留学人员科技活动择优资助项目(2015年);陕西省国际科技合作与交流计划项目(2016KW-055);陕西省耐磨材料工程技术研究中心专项资金项目(2016NMZX03)

摘　　要：对采用布里奇曼定向凝固技术制备的Ni-Si共晶复合材料的晶体生长机理进行了研究。结果表明,在初始过渡区形成的是较粗大的金属间化合物和α-Ni基体。在稳态晶体生长区,形成了α-Ni、Ni_3Si、Ni_31Si_(12)三相。在分析已有的热力学数据基础上,采用双参数模型,并通过模型求解,估算了二元金属化合物Ni_3Si、Ni_31Si_(12)的标准生成焓,并从热力学角度,探索了亚稳相的形成机理。The crystal growth mechanism of Ni-Si eutectic in-situ composite produced by bridgman directional solidification technique was studied. The results show that the coarse intermetallic compound and α-Ni matrix can be obtained in the primary transion zone. The α-Ni, Ni3Si and Ni31Si12 phases can be obtained in stable crystal growth zone. Based the analysis of existing thermodynamic data, a two-parameter model for estimating the standard enthalpy of dual intermetallic was adopted to calculate the standard enthalpies of Ni3Si and Ni31Si12 phase. Moreover, the formation mechanism of metastable phase was researched from the viewpoint of the thermo-dynamics.

关 键 词：定向凝固 布里奇曼 亚稳相 标准生成焓 

分 类 号：TG244.3[金属学及工艺—铸造]