离心对ZCuSn3Zn8Pb6Ni1FeCo合金析出相行为的影响  

Effects of Centrifugalization on Behavior of Precipitated Phases in ZCuSn3Zn8Pb6Ni1FeCo Alloy

作　　者：刘晓珂[1] 王强松[1] 王自东[1] 冯再强[1] 张鸿[1] 朱军军[1] 范明[1] 

机构地区：[1]北京科技大学材料科学与工程学院,北京100083

出　　处：《铸造》2010年第4期351-354,共4页Foundry

基　　金：国家自然科学基金资助项目(10972030)

摘　　要：采用真空熔炼-离心铸造工艺制备出ZCuSn3Zn8Pb6Ni1FeCo合金试样。利用专用图像分析软件确定试样的晶粒度,并通过光学显微镜、TEM等分析手段,研究了离心对析出相行为的影响。结果表明:与常规铸造工艺相比,离心铸造使得平均晶粒直径由88～125μm降低到44～62μm,晶粒细化明显;析出相分布呈双峰分布,与非离心相比,离心条件下粗大析出相明显细化,细小析出相变化不大,且与基体间保持共格或半共格关系;离心压力对金属组织性能的影响主要原因是离心压力降低了临界晶核形核功,提高了扩散激活能,使晶粒细化。The samples of ZCuSn3Zn8Pb6Ni1FeCo alloy were fabricated by vacuum melting-centrifugal casting technology. The grain size was determined by the special image analysis software. The impact of centrifugal force on the behavior of precipitated phases in the alloy was researched by optical microscope, transmission electron microscopic and other analytical tools. The results show that compared with normal casting technique, centrifugal casting made the average of grain diameter decreased to 44-62 μm from 88-125 μm. There is a dramatic refinement on the grains. The distribution of precipitated phases is bimodal distribution. Compared with the sample without centrifugal casting, the coarse precipitated phases under centrifugal condition refined greatly, but the fine precipitated phases changed little, and keep coherence or semi-coherence with the matrix. The centrifugal pressure has an impact on the cast structure mainly because it lowers the critical nucleation energy, raised the diffusion activation energy, which made the grains refined.

关 键 词：离心压力 金属凝固 形核率 ZCuSn3Zn8Pb6Ni1FeCo合金 

分 类 号：TG249.4[金属学及工艺—铸造]