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| 1 | 金属材料凝固过程研究现状与未来展望显示文摘金属凝固作为冶金铸造技术的一个重要工艺过程,经历了从古老技艺向现代科学的漫长演化,于20世纪后半叶发展成为材料科学中一个相对完整的学科领域。随着各种相关高新技术的不断涌现,特别是信息化时代的到来,凝固科学技术正在迅速转型发展。本文系统总结了最近20年来国内外在液态合金的微观结构与物化性质、晶体形核与过程调控、凝固组织形成机理、超常凝固动力学以及新型材料凝固制备成形等五方面研究的主要进展,并分析展望了这一学科领域的未来发展趋势。 | 翟薇 常健 耿德路 魏炳波 | 2019 | 中国有色金属学报2019，29，9： | 25 |
| 2 | Structural evolution of Al–8%Si hypoeutectic alloy by ultrasonic processing显示文摘High intensity power ultrasound was respectively introduced into three different solidification stages of Al–8%Si hypoeutectic alloy, including the fully liquid state before nucleation, the nucleation and growth process of primary α(Al) phase and L →(Al) +(Si) eutectic transformation period. It is found that both the primary α(Al) phase and(Al + Si) eutectic structure were refined by different degrees with various growth morphologies depending on the ultrasonic treatment stage. Based on the experimental results,the cavitation-induced nucleation due to the high undercooling caused by the collapse of tiny cavities was proposed as the major reason for refining the primary α(Al) phase. Meanwhile, obvious eutectic morphological change was observed only when ultrasound was directly introduced in the eutectic transformation stage, in which typical divorced eutectics and(Al + Si) eutectic cells with symmetrical flower shape were formed at the top of the alloy sample. The introduction of ultrasound in each solidification stage also improves the yield strength of Al–8% Si alloy to a diverse extent. | J.Y.Wang B.J.Wang L.F.Huang | 2017 | Journal of Materials Science & Technology2017，33，11： | 4 |
| 3 | Effect of power ultrasound on microstructural characteristics and mechanical properties of Al_(81.3)Sn_(12.3)Cu_(6.4) monotectic alloy显示文摘The liquid phase separation process and solidification process of ternary Al_(81.3)Sn_(12.3)Cu_(6.4) monotectic alloy was accomplished with a 20 kHz ultrasonic field in the power range up to 500 W.As ultrasound power rised,the coarse primary(Al) dendrites turned into fine equiaxed grains,whose size decreased by one order of magnitude as that during static solidification.Meanwhile,rather than pronounced segregation of large secondary(Sn) blocks in the alloy sample solidified under static condition,tiny secondary(Sn) droplets dispersed homogenously within the(Al)matrix in the presence of ultrasound.Under the highest ultrasound power of 500 W,the spherical ternary(Al + Sn + θ(Al_2Cu)) monotectic cells formed.The refinement of primary(Al) dendrites and uniform distribution of secondary(Sn) droplets induced by power ultrasound result in the improvement of microhardness,wear resistance,compressive and yield strength of ternary Al_(81.3)Sn_(12.3)Cu_(6.4) monotectic alloy. | Wei Zhai Hanman Liu Pengfei Zuo Xiannian Zhu Bingbo Wei | 2015 | Progress in Natural Science:Materials International2015，25，5： | 2 |
| 4 | Microgravity Material Research in China:2016显示文摘Firstly,recent research works of high undercooling and rapid solidification of metallic alloys under ground simulation conditions in Northwestern Polytechnical University are reviewed.Secondly,under normal gravity and microgravity of binary to quinary Nickel-base single crystal alloys with different contents of W,Ta,Al and Ti elements are comparatively investigated by Institute of Metal Research using drop tube.Thirdly,solidification and crystal growth of SJ10-Recoverable Scientific Experiment Satellite by Institute of Semiconductors is introduced. | XIE Wenjun LUO Xinghong ZHANG Xingwang YU Yude | 2016 | 空间科学学报2016，36，5： | 1 |
| 5 | Microstructural evolution of ternary Ag_33Cu-_42Ge_25 eutectic alloy inside ultrasonic field显示文摘Ultrasonic field with a frequency of 20 k Hz is introduced into the solidification process of ternary Ag33Cu42Ge25 eutectic alloy from the sample bottom to its top. The ultrasound stimulates the nucleation of alloy melt and prevents its bulk undercooling. At low ultrasound power of 250 W,the primary ε2phase in the whole alloy sample grows into non-faceted equiaxed grains, which differs to its faceted morphology of long strip under static condition. The pseudobinary(Ag t ε2) eutectic transits from dendrite shape grain composed of rod type eutectic to equiaxed chrysanthemus shape formed by lamellar structure. By contrast, the ultrasound produces no obvious variation in the morphology of ternary(Ag t Ge t ε2) eutectic except a coarsening effect. When ultrasound power rises to 500 W, divorced ternary(Ag t Ge t ε2) eutectic forms at the sample bottom. However, in the upper part, the ultrasonic energy weakens, and it only brings about prominent refining effect to primary ε2phase.The microstructural evolution mechanism is investigated on the cavitation, acoustic streaming and acoustic attenuation. | Wei Zhai Xiaoyu Lu Bingbo Wei | 2014 | Progress in Natural Science:Materials International2014，24，6： | 1 |
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