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微重力条件下块体金属玻璃的若干基础问题研究进展 被引量:1
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作者 闻平 王彬彬 +2 位作者 丁大伟 赵德乾 汪卫华 《中国材料进展》 CAS CSCD 北大核心 2017年第12期880-893,共14页
玻璃是最古老也是现代应用最广的材料之一,列属于非晶态物质,组成单元的无序排列致使其物理本质、物性的内涵以及性能优化等依旧是当代材料、物理和化学学科研究热点和难点。作为新型合金材料和玻璃,金属玻璃,特别是块体金属玻璃,尽管... 玻璃是最古老也是现代应用最广的材料之一,列属于非晶态物质,组成单元的无序排列致使其物理本质、物性的内涵以及性能优化等依旧是当代材料、物理和化学学科研究热点和难点。作为新型合金材料和玻璃,金属玻璃,特别是块体金属玻璃,尽管出现较晚,但因具有重要潜在应用价值和基础理论研究意义,一经出现就受到了广泛关注。微重力条件下块体金属玻璃研究不仅促进了玻璃形成机理、液体热力学特征、过冷液体动力学行为以及深过冷液体形核与长大等等长期存在的基础理论问题研究,也推动着此类材料的实际应用。在梳理了过去30年来国内外块体金属玻璃微重力条件下研究进展的基础上,对于未来国内块体金属玻璃微重力条件下的研究进行了展望。 展开更多
关键词 金属玻璃 微重力:玻璃化转变 热力学与动力学
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Giant enhancement of magnetocaloric effect in metallic glass matrix composite 被引量:5
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作者 WANG YongTian BAI HaiYang +2 位作者 PAN MingXiang zhao deqian WANG WeiHua 《Science China(Physics,Mechanics & Astronomy)》 SCIE EI CAS 2008年第4期337-348,共12页
The magnetocaloric effect (MCE) has made great success in very low temperature refrigeration, which is highly desirable for application to the extended higher tem-perature range. Here we report the giant enhancement o... The magnetocaloric effect (MCE) has made great success in very low temperature refrigeration, which is highly desirable for application to the extended higher tem-perature range. Here we report the giant enhancement of MCE in the metallic glass composite. The large magnetic refrigerant capacity (RC) up to 103 J·kg-1 is more than double the RC of the well-known crystalline magnetic refrigerant compound Gd5Si2Ge1.9Fe0.1 (357 J·kg-1) and MnFeP0.45As0.55 (390 J·kg-1)(containing either ex-orbitant-cost Ge or poisonous As). The full width at half maximum of the magnetic entropy change (ΔSm) peak almost spreads over the whole low-temperature range (from 303 to 30 K), which is five times wider than that of the Gd5Si2Ge1.9Fe0.1 and pure Gd. The maximum ΔSm approaches a nearly constant value in a wide tem-perature span over 100 K, and however, such a broad table-like region near room temperature has seldom been found in alloys and compounds. In combination with the intrinsic amorphous nature, the metallic glass composite may be potential for the ideal Ericsson-cycle magnetic refrigeration over a broad temperature range near room temperature. 展开更多
关键词 METALLIC GLASS MAGNETOCALORIC effect COMPOSITE
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Toward an ideal electrical resistance strain gauge using a bare and single straight strand metallic glassy fiber 被引量:5
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作者 YI Jun HUO LiShan +3 位作者 zhao deqian PAN MinXiang BAI HaiYang WANG WeiHua 《Science China(Physics,Mechanics & Astronomy)》 SCIE EI CAS 2012年第4期609-613,共5页
Electrical resistance strain gauges(SGs) are useful tools for experimental stress analysis and the strain sensing elements in many electromechanical transducers including load cells,pressure transducers,torque meters,... Electrical resistance strain gauges(SGs) are useful tools for experimental stress analysis and the strain sensing elements in many electromechanical transducers including load cells,pressure transducers,torque meters,accelerometers,force cells,displacement transducers and so forth.The commonly used commercial crystalline strain sensing materials of SGs are in the form of wire or foil of which performance and reliability is not good enough due to their low electrical resistivity and incapacity to get thin thickness.Smaller SGs with single straight strand strain sensing materials,which are called ideal SG,are highly desirable for more than seven decades since the first SG was invented.Here,we show the development of a type of minuscule length scale strain gauge by using a bare and single straight strand metallic glassy fiber(MGF) with high resistivity,much smaller lengthscale,high elastic limits(2.16%) and especially the super piezoresistance effect.We anticipate that our metallic glassy fiber strain gauge(MGFSG),which moves toward the ideal SGs,would have wide applications for electromechanical transducers and stress analysis and catalyze development of more micro-and nanoscale metallic glass applications. 展开更多
关键词 metallic glassy fiber strain gauge strain sensing material metallic glassy fiber strain gauge
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