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Rare Metals 2001年第3期20卷 168-173页

作者： donghui wang,jianguo li, yankang zheng, bingzhe bai department of materials science and engineering, tsinghua university, beijing 100084, china 清华大学北京 100084

Effects of Si content and the addition amount of Al-3B master alloy on the solidification structures of hypoeutectic Al-Si alloys were studied. The addition amounts of the master alloy were 0.2%, 0.4%, 0.7% and 1% (mass fraction, so as the follows), respectively. The Si content of Al-Si binary alloys investigated varied from 1% to 11%. The observation of macrostructures of non-refined samples showed that 3% Si constitutes a transition point at which the minimum grain size can be obtained. It was also found that Al-3B master alloy can shift the transition point towards a higher Si value when its addition amount increases, making this point appear at 4%, 5% and 6% Si as its addition amount increases up to 0.4%, 0.7% and 1%, respectively.

关键词： Al-3B master alloy hypoeutectic Al-Si alloy grain refinement

Comparison of corrosion behavior of ZL104 alloy at as-cast and heat treatment states

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Rare Metals 2002年第3期21卷 224-228页

作者： wang donghui, zheng yankang, li ianguo, and bai bingzhedepartment of materials science and engineering, tsinghua university, beijing 100084, china department of materials science and engineering Tsinghua University 北京 100084

The corrosion behavior of ZL104 alloy at different states (as-cast and heattreatment) in salt spray corrosion (SSC) was studied. The results show that the sample treated afterrefinement and modification has the least corrosive resistance compared with the sample bearingas-cast structure at the beginning of the corrosion. As the corrosion process continued, however,the trend reversed itself. After 44 h continuous corrosion, the corrosive rates of all samples tendto be stable. After experiments, the sample bearing as-cast structure had the most corrosiveproducts on the surface whereas the sample being refined and modified had the least products. TheFourier transformation infrared spectroscopy (FTIR) analyses of the corrosion products show thatthese products are composed of hydroxyl-containing substances.

关键词： ZL104 alloy modification salt spray corrosion (SSC)

铸模高温下混合稀土对A356铸铝合金的作用

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中国稀土学报 2005年第S2期23卷 77-81页

作者：周卓玮李建国白秉哲清华大学材料科学与工程系北京100084

研究了铸模温度为600℃的高温低冷却速度下Al-8%RE中间合金对A356合金显微组织的影响。通过扫描电镜观察发现Sr对Si相的变质效果会随着铸模温度的升高而减弱。在铸模温度为600℃浇注的冷却条件下,RE对未变质的A356合金中Si相有变质效果... 详细信息

研究了铸模温度为600℃的高温低冷却速度下Al-8%RE中间合金对A356合金显微组织的影响。通过扫描电镜观察发现Sr对Si相的变质效果会随着铸模温度的升高而减弱。在铸模温度为600℃浇注的冷却条件下,RE对未变质的A356合金中Si相有变质效果,对已经0.02Sr%变质过的A356合金RE的加入量为0.16%~0.24%时,RE和Sr能很好地对Si相共同作用,使得Si相更细小、圆整。

关键词： A356 铸模温度显微组织稀土

Electrochemical behavior of open-cellular structured Ti-6Al-4V alloy fabricated by electron beam melting in simulated physiological fluid:the significance of pore characteristics

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Journal of materials science & Technology 2022年第2期97卷 272-282页

作者： Xin Gai Rui liu Yun bai Shujun li Yang Yang Shenru wang jianguo Zhang Wentao Hou Yulin Hao Xing Zhang Rui Yang R.D.K.Misra Shi-changxu Innovation Center for Advanced materials Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China School of materials science and engineering University of Science and Technology of ChinaShenyang 110016China department of Orthopedic Surgery Peking Union Medical College Hospital(PUMCH)Peking Union Medical College and Chinese Academy of Medical SciencesBeijing 100730China department of Metallurgical Materialsand Biomedical EngineeringThe University of Texas at El Paso500W.University AvenueEl PasoTX 79968United States

The cellular structured titanium alloys have attracted significant attention for implants because of their lower Young’s modulus,which is comparable to human bone and has the capability of providing space for bone tissue ***,there is a gap in the knowledge in regard to the relationship between the pore characteristics and the electrochemical performance of open-cellular structured titanium *** this study,we elucidate the influence of pore characteristics on the electrochemical performance of open-cellular structured Ti-6Al-4V alloys produced by electron beam melting(EBM).Intriguingly,the passive film formed on cellular structured Ti-6Al-4V alloy with a larger pore size was more stable and protective,and the corrosion performance was superior compared to the samples with a smaller pore size in phosphate buffered saline(PBS),mainly because of relatively smaller exposed surface area and unlimited flow of ***,in acidic PBS containing fluoride ions,the pore characteristics did not play an important role in the corrosion *** was considered that the protective film breaks down such that the corrosion performance of cellular structured alloys was comparable to each other in this harsh environment.

关键词： Cellular structure Ti-6Al-4V Electron beam melting Corrosion resistance Fluoride ion