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一种铝合金无铬磷酸盐稀土转化膜的结构 被引量:1
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作者 李红玲 陈改荣 《腐蚀与防护》 CAS 北大核心 2011年第9期694-696,700,共4页
采用扫描电镜、X射线衍射、电流-时间和电位-时间曲线等方法,对6061铝合金表面含Zn、Fe、P、O、Ce而不含铬的复合磷酸盐转化膜的表面形貌、相结构、成分及磷化过程动力学进行了初步的分析和研究。结果表明,添加了稀土的磷化膜表面的块... 采用扫描电镜、X射线衍射、电流-时间和电位-时间曲线等方法,对6061铝合金表面含Zn、Fe、P、O、Ce而不含铬的复合磷酸盐转化膜的表面形貌、相结构、成分及磷化过程动力学进行了初步的分析和研究。结果表明,添加了稀土的磷化膜表面的块状结晶更加致密,颗粒更小,外观呈浅灰色,其晶粒排列纵横交错;磷化膜的主要成分为磷酸锌和磷酸铁锌,添加了稀土的磷化液中所形成磷化膜的衍射强度明显降低,且其衍射峰也明显变宽。 展开更多
关键词 稀土转化 形貌 电位和电流时间曲线 相结构 转化膜成分
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Non-equilibrium alloy phase formation and transformation driven by ion beam mixing in the Fe-Hf-Nb multilayers 被引量:2
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作者 LI Nan WANG TongLe +3 位作者 DING Ning DAI Ye BAI Xue LIU BaiXin 《Science China(Technological Sciences)》 SCIE EI CAS 2012年第3期640-645,共6页
In the ion beam mixing experiments,eight Fe-Hf-Nb multilayered films,with overall compositions of Fe67Hf22Nb11,Fe67Hf11Nb22,Fe54Hf38Nb8,Fe54Hf30Nb16,Fe54Hf11Nb35,Fe25Hf67Nb8,Fe25Hf50Nb25 and Fe25Hf11Nb64,were irradiat... In the ion beam mixing experiments,eight Fe-Hf-Nb multilayered films,with overall compositions of Fe67Hf22Nb11,Fe67Hf11Nb22,Fe54Hf38Nb8,Fe54Hf30Nb16,Fe54Hf11Nb35,Fe25Hf67Nb8,Fe25Hf50Nb25 and Fe25Hf11Nb64,were irradiated by 200 keV xenon ions to doses ranging from 3×1014 Xe+/cm2 to 7×1015 Xe+/cm2.The results showed that unique amorphous phases were obtained at designed alloy compositions,falling in the favored glass-forming region deduced from three binary metal sub-systems.Interestingly,at some alloy compositions,the crystal-amorphous-crystal transformations were observed back and forth while varying the irradiation doses.In addition,at the alloy composition of Fe25Hf67Nb8,a metastable FCC phase was formed through an HCP-FCC structural phase transformation and it had a large lattice constant identified to be a=4.51 .Besides,the formation mechanism of non-equilibrium alloy phases was also discussed in terms of thermodynamics of solids and atomic collision theory. 展开更多
关键词 phase transformation ion beam mixing amorphous phase Fe-Hf-Nb system shearing mechanism
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