| 引用本文: | 王雷,沈军,冯周荣,傅恒志.Pr对Sn-Cd包晶合金定向凝固组织的影响[J].材料科学与工艺,2012,20(4):13-19.DOI:10.11951/j.issn.1005-0299.20120403. |
| WANG Lei,SHEN Jun,FENG Zhou-rong,FU Heng-zhi.Effect of praseodymium on directional solidification microstructure of Sn-Cd peritectic alloys[J].Materials Science and Technology,2012,20(4):13-19.DOI:10.11951/j.issn.1005-0299.20120403. |
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| 摘要: |
| 为了解Pr对Sn-Cd包晶合金凝固组织的作用,在不同抽拉速率下对Sn-Cd-Pr合金进行定向凝固实验.采用光学显微镜、扫描电子显微镜(SEM)和能谱分析(EDS)研究了Pr对Sn-Cd包晶合金凝固组织的影响.研究发现:对于Sn-1.8%Cd过包晶合金,在2 μm/s时0.5%的Pr增加了包晶相β的体积分数;在4 μm/s时凝固组织明显细化.对于Sn-0.65 % Cd亚包晶合金,在4 μm/s时Pr的加入促进了平→胞界面的转变;在16 μm/s时随着Pr含量的增大,凝固组织逐渐细化;在100 μm/s时Pr含量的增大使凝固组织仅有微弱的细化.研究表明,Pr的加入可以改变组成相的体积分数、细化组织以及减小界面稳定性. |
| 关键词: 定向凝固组织 Sn-Cd包晶合金 Pr 平→胞转变 组织细化 |
| DOI：10.11951/j.issn.1005-0299.20120403 |
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| 基金项目:国家自然科学基金资助项目(50774061;51074128);凝固技术国家重点实验室自主研究课题资助项目(28-TP-2009). |
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| Effect of praseodymium on directional solidification microstructure of Sn-Cd peritectic alloys |
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WANG Lei, SHEN Jun, FENG Zhou-rong, FU Heng-zhi
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State Key Laboratory of Solidification Processing,Northwestern Polytechnical University,Xi′an 710072,China
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| Abstract: |
| To understand the effect of praseodymium(Pr) on solidification structures of Sn-Cd alloys,the alloy Sn-Cd-Pr is experimented by directional solidification at different withdrawing rates.The effect of Pr on solidification structures of Sn-Cd alloys is studied by using optical microscope,scanning electron microscope(SEM) and energy spectrum analysis(EDS).For Sn-1.8 wt% Cd hyperperitectic alloy,the amount of the peritectic β phase of Sn-1.8 wt% Cd with 0.5 wt% Pr increases at the rate of 2 μm/s,and the microstructure refines distinctly at the rate of 4 μm/s.For Sn-0.65 wt% Cd hypoperitectic alloy,the addition of Pr promotes the planar → cellular transition at the rate of 4 μm/s.The microstructure refines by degrees with the increasing of Pr content at the rate of 16 μm/s.However,the microstructure changes unsignificantly with the increasing of Pr content at the rate of 100 μm/s.The addition of Pr can change the volume fraction of phase,refine the microstructure and decrease the interface stability. |
| Key words: directional solidification structure Sn-Cd peritectic alloy Pr planar → cellular transition structure refining |
