金海军
博士 研究员 博士生导师
中国科学院金属研究所 沈阳材料科学国家研究中心联合研究部
纳米多孔金属材料的制备、纳米多孔结构的形成和演变;纳米多孔金属的力学稳定性以及纳米尺度晶体变形行为;纳米多孔金属力学性能和物理性质的原位往复调节,以及相应的功能应用探索。
个性化签名
- 姓名:金海军
- 目前身份:在职研究人员
- 担任导师情况:博士生导师
- 学位:博士
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学术头衔:
博士生导师
- 职称:高级-研究员
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学科领域:
金属材料
- 研究兴趣:纳米多孔金属材料的制备、纳米多孔结构的形成和演变;纳米多孔金属的力学稳定性以及纳米尺度晶体变形行为;纳米多孔金属力学性能和物理性质的原位往复调节,以及相应的功能应用探索。
金海军,沈阳材料科学国家研究中心联合研究部研究员,硕士生导师。2004年06月毕业于中国科学院金属研究所,获得材料学专业博士学位;2005年07月-2010年06月在德国卡尔斯鲁厄理工学院(KIT)做博士后研究;2006年获德国洪堡(博士后)奖学金;2010年07月至今在中国科学院金属研究所任研究员。
研究领域:纳米多孔金属材料的制备、纳米多孔结构的形成和演变;纳米多孔金属的力学稳定性以及纳米尺度晶体变形行为;纳米多孔金属力学性能和物理性质的原位往复调节,以及相应的功能应用探索。
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主页访问
157
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关注数
0
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成果阅读
298
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成果数
5
【期刊论文】A Material with Electrically Tunable Strength and Flow Stress
SCIENCE,2011,332(6034):1179-1182
2011年06月03日
The selection of a structural material requires a compromise between strength and ductility. The material properties will then be set by the choice of alloy composition and microstructure during synthesis and processing, although the requirements may change during service life. Materials design strategies that allow for a recoverable tuning of the mechanical properties would thus be desirable, either in response to external control signals or in the form of a spontaneous adaptation, for instance in self-healing. We have designed a material that has a hybrid nanostructure consisting of a strong metal backbone that is interpenetrated by an electrolyte as the second component. By polarizing the internal interface via an applied electric potential, we accomplish fast and repeatable tuning of yield strength, flow stress, and ductility. The concept allows the user to select, for instance, a soft and ductile state for processing and a high-strength state for service as a structural material.
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【期刊论文】Bulk Nanoporous Metal for Actuation
Advanced Engineering Materials,2010,12(8):714-723
2010年08月31日
Nanoporous metals prepared by controlled chemical or electrochemical corrosion of alloys can provide prototypical manifestations of bulk nanostructured material. Samples are readily prepared with dimensions at the millimeter or centimeter scale, while at the same time the microstructure is a homogeneous array of interpenetrating solid skeleton phase and pore channels with a characteristic size that can reach down to below 5 nm. The interest in nanoporous metals as functional materials derives from recent observations of unique materials behavior resulting from their extremely small structure size and their open porosity with large volume-specific surface area. As an example, this article discusses the possible use of nanoporous metal for actuation.
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【期刊论文】Nanoporous Au−Pt Alloys As Large Strain Electrochemical Actuators
Nano Lett.,2009,10(1):187–194
2009年12月14日
Nanoporous Au−Pt alloys with pore- and ligament size down to few nanometers were fabricated by dealloying Ag−Au−Pt. Owing to the small structure size and large specific surface area, the surface stress and its variation give rise to significant stress and strain in the bulk of these materials. In fact, dilatometry experiments find electrochemical actuation with large reversible strain amplitude. The linear strain reaches ∼1.3% and strain energy density is up to 6.0 MJ/m3. The associated stresses may approach the elastic limit of the alloy.
Nanoporous metals, actuation, surface stress, gold, platinum
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【期刊论文】Nanoporous Metals by Alloy Corrosion: Formation and Mechanical Properties
MRS Bulletin,2011,34():577–586
2011年01月31日
Nanoporous metals prepared by the corrosion of an alloy can take the form of monolithic, millimeter-sized bodies containing approximately 1015 nanoscale ligaments per cubic millimeter. The ligament size can reach down to the very limits of stability of nanoscale objects. The processes by which nanoporous metals are formed have continued to be fascinating, even though their study in relation to surface treatment, metal refinement, and failure mechanisms can be traced back to ancient times. In fact, the prospect of using alloy corrosion as a means of making nanomaterials for fundamental studies and functional applications has led to a revived interest in the process. The quite distinct mechanical properties of nanoporous metals are one of the focus points of this interest, as relevant studies probe the deformation behavior of crystals at the lower end of the size scale. Furthermore, the coupling of bulk stress and strain to the forces acting along the surface of nanoporous metals provide unique opportunities for controlling the mechanical behavior through external variables such as the electrical or chemical potentials.
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【期刊论文】Deforming nanoporous metal: Role of lattice coherency
Acta Materialia,2009,57(9):2665-2672
2009年05月01日
Nanoporous metals prepared by alloy corrosion may assume the form of monolithic, millimeter-sized bodies containing around 1015 nanoscale ligaments per cubic millimeter. Here, we report on the fabrication and mechanical behavior of macroscopic, crack-free nanoporous gold samples which exhibit excellent ductility in compression tests. Their yield stress is significantly lower than that expected based on scaling laws or on previous nanoindentation experiments. Electron backscatter diffraction imaging reveals a polycrystalline microstructure with grains larger than 10 μm which acquire a subdomain structure during plastic flow, but remain otherwise intact. We highlight the action of lattice dislocations which can travel over distances much larger than the ligament size. This results in a collective deformation of the many ligaments in each grain. Remarkably, the dislocation cores are partly located in the pore channels. The results suggest a critical view of the conversion between indentation hardness and yield stress in previous work.
Nanoporous, Dealloying, Plastic deformation, Compression test, Hardness test
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