Cu-Ni-Si三元合金的显微组织与相选择（英文）

发布时间：2018-01-19 05:37

本文关键词： Cu-Ni-Si合金显微组织晶界相相选择　出处：《稀有金属材料与工程》2015年12期 　论文类型：期刊论文

【摘要】：采用静平衡凝固技术制备了Cu含量为90wt%、不同Ni/Si原子比的Cu-Ni-Si合金,采用扫描电镜(SEM)、能谱分析(EDS)和X射线衍射仪(XRD)对合金的显微组织和相组成进行了分析,利用差热分析(DSC)考察了合金熔体在冷却过程中的相转变行为。研究结果表明,Ni/Si原子比对Cu-Ni-Si合金显微组织的影响可归因为α-Cu晶粒内部析出的δ-Ni2Si相数量的变化和晶界相在Cu-Si和Ni-Si化合物之间的选择。δ-Ni_2Si相数量的变化与初生α-Cu内部Ni、Si原子的浓度密切相关,而晶界相的相选择则是Cu-Si和Ni-Si金属间化合物相之间竞争的结果。随着Ni/Si原子比的增加,残余液相中Ni原子浓度增加增高,具有更负形成焓Ni-Si金属间化合物逐渐从竞争中胜出,导致晶界相从Cu-Si化合物向Ni-Si化合物的转变。
[Abstract]:Cu-Ni-Si alloys with 90 wtCu content and different Ni/Si atomic ratios were prepared by static equilibrium solidification technique. The microstructure and phase composition of the alloy were analyzed by energy dispersive spectroscopy (EDS) and X-ray diffractometer (XRD). The phase transition behavior of alloy melt during cooling was investigated by differential thermal analysis (DSCS). The effect of Ni/Si atomic ratio on the microstructure of Cu-Ni-Si alloy can be attributed to the change of 未 -Ni _ 2Si phase precipitation in 伪 -Cu grains and the grain boundary phases in Cu-Si and Ni-Si. The change of 未 -Ni2Si phase and the primary Ni in 伪 -Cu. The concentration of Si atom is closely related, while the phase selection of grain boundary phase is the result of competition between Cu-Si and Ni-Si intermetallic compound phase. With the increase of Ni/Si atom ratio. With the increase of the concentration of Ni atom in the residual liquid phase, the Ni-Si intermetallic compound with more negative formation enthalpy gradually wins from competition, which leads to the transition of grain boundary phase from Cu-Si compound to Ni-Si compound.
【作者单位】：西安理工大学;陕西省电工材料与熔(浸)渗技术重点实验室;西安航空高等专科学校;
【基金】：National Natural Science Foundation of China(51174161) Special Research Foundation of Xi’an University of Technology(2013TS002) Natural Science Foundation of Shaanxi Province(2013JQ6006) Industrial Research Project of Science and Technology Department(2013K09-13) Educational Official Scientific Research Foundation(2013JK0899) Foundation of Key Laboratory of Electrical Materials and Infiltration Technology(2011HBSZS009) Special Foundation of Key Disciplines of Shaanxi Province,State Key Laboratory of Solidification Processing in NWPU(SKLSP201213)
【分类号】：TG146.11
【正文快照】： Recently,much attention has been drawn to Cu-Ni-SiAlthough Kaki Yamamoto’s work[10]could provide a goodalloys due to their enormous potential to combine both highguidance for the selection of Ni/Si ratio in the case of lowstrength and high electrical co

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