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| 1 | LY12铝合金氧化膜与钎剂的反应机制显示文摘采用CsF AlF3中温无腐蚀钎剂能够去除LY12铝合金表面复杂的氧化膜,实现LY12铝合金的中温钎焊。研究发现:改进的CsF AlF3钎剂是以反应、溶解方式去除氧化膜的;在去膜过程中,CsF化合物起主要去膜作用,钎剂的高活性与NH4F、NH4AlF4及复合盐熔体等化合物的存在有关,它们的存在可提高CsF AlF3钎剂的去膜能力,而HF的生成则是诱发和加速反应、提高溶解去膜能力的关键;微量稀土元素镧未在界面出现富集现象,微量的稀土氟化物则起着'助溶'的作用。 | 薛松柏 陈文华 吕晓春 钱乙余 | 2004 | 中国有色金属学报2004，14，4： | 17 |
| 2 | Influence of chemical composition and alloying elements on microdefects and electron density in Ni-Al alloys显示文摘Positron lifetime spectra have been measured in binary Ni Al alloys with different chemical composition and NiAl alloys doped with Cr, Zr, Fe and Mg. The results indicate that in B2 NiAl and Ll 2 Ni 3Al alloys, some of the valance electrons of Ni and Al atoms are localized, which leads to a lower free electron density of the alloy. The mean free electron density of the binary Ni Al alloy decreases with increasing Al content. The open volume of defects on grain boundary of the Ni 3Al is larger than that of monovacancy or dislocation. Structural vacancies and microvoids are found in B2 NiAl alloys with Al content above 45%(mole fraction), and the concentration of the vacancies and open volume of microvoids will increase with higher Al content. The addition of Cr, Zr and Fe into a NiAl alloy can increase its mean free electron density and reduce the open volume of defects on its grain boundary, while with addition of Mg into the NiAl alloy, its mean free electron density decreases and open volume of boundary defects increases. | 邓文 黄宇阳 吴道宏 熊良钺 王淑荷 郭建亭 | 2002 | 中国有色金属学会会刊:英文版2002，12，3： | 4 |
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