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国家自然科学基金(50874100)

作品数:9 被引量:30H指数:3
相关作者:陈荣石孙志梅周健韩恩厚高磊更多>>
相关机构:中国科学院金属研究所厦门大学中国科学院研究生院更多>>
发文基金:国家自然科学基金国家重点基础研究发展计划更多>>
相关领域:金属学及工艺一般工业技术理学更多>>

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9 条 记 录,以下是 1-10
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Creep behavior of ageing hardened Mg-10Gd-3Y alloy
2010年
Tensile creep behaviors of the ageing hardened Mg-10Gd-3Y alloy(referred to GW103)were investigated at temperatures up to 300℃.The extruded-T5 specimen exhibited high creep resistance,i.e.the low steady-state creep rate and long creep rupture time,while the better creep properties were observed in the cast-T6 one.The low steady-state creep rate of 1.71×10- 9s -1is obtained at 200℃and 80 MPa for the extruded-T5 GW103 alloy.In addition,the microstructure development of GW103-T5 alloy was also examined after creep exposure at different temperatures.On the other hand,the stress exponent and activation energy were studied in the temperature range of 200-300℃for the extruded-T5 specimens,and the creep mechanism was also discussed.
刘喜波关逊陈荣石韩恩厚
关键词:蠕变行为时效硬化抗蠕变性能温度范围
Microstructures and mechanical properties of cold rolled Mg-8Li and Mg-8Li-2Al-2RE alloys被引量:7
2010年
The microstructures and mechanical properties of Mg-8Li and Mg-8Li-2Al-2RE alloy sheets were evaluated after cold rolling.Both alloys contain α-phase and β-phase which consists of a solid solution of Mg in BCC Li.The proportion ofβ-phase in both alloys is approximately 60%.Theα-phase andβ-phase are elongated approximately parallel to the rolling direction and there is no sign of recrystallization even after being annealed at 200℃for 1 h.The yield strength of Mg-8Li-2Al-2RE sheets is about 165 MPa with elongation of 35%along rolling direction,while the yield strength is about 187 MPa with elongation of 21%along the direction titled 45ü to rolling direction.Theα-phase in both alloys exhibits basal texture,and the intensity of basal texture in Mg-8Li is larger than that in Mg-8Li-2Al-2RE.However,theβ-phase shows(100)texture,and the intensity of(100)texture in Mg-8Li is twice of that in Mg-8Li-2Al-2RE.It could be attributed to the existence of RE-containing particles in Mg-8Li-2Al-2RE.
闫宏陈荣石韩恩厚
关键词:合金相冷轧微结构屈服强度微观结构
Bonding interface zone of Mg-Gd-Y/Mg-Zn-Gd laminated composite fabricated by equal channel angular extrusion被引量:3
2010年
In order to improve the mechanical properties and corrosion resistance of Mg alloys,the equal channel angular extrusion (ECAE)was employed to fabricate the Mg-5Gd-5Y/Mg-2Zn-1Gd(GW55/ZG21)laminated composites.After fabrication and annealing treatment,the microstructural evolution,phase constitution,microhardness,and bonding strength were investigated on the bonding interface zone of GW55/ZG21 laminated composites.The bonding interface zone of GW55/ZG21 laminated composites comprises a lot of Mg3(Y,Gd)2Zn3 particles along the bonding interface,some rod Mg24(Y,Gd)5 phases on GW55 side,and a precipitation free zone(PFZ)on ZG21 side.After annealing treatment,Mg3(Y,Gd)2Zn3 particles along the bonding interface increase, rod Mg24(Y,Gd)5 phases on GW55 side decrease,and PFZ is broadened.Meanwhile,the hardness on the bonding interface zone decreases and the bonding strength increases from 126 MPa to 162 MPa.
吴迪陈荣石韩恩厚
关键词:层压复合材料等通道角挤压界面区层状复合材料
Electronic origin of the anomalous solid solution hardening of Y and Gd in Mg:A first-principles study被引量:4
2011年
Y and Gd demonstrate anomalous solid solution hardening efficiency,which cannot be understood using the elastic impuritydislocation interaction theory.We performed first-principles calculations to investigate the effect of different alloying elements such as Al,Zn,Y,and Gd on the chemical bonding of Mg solid solutions.The present calculations clearly show that the anomalous solid solution hardening of Y and Gd in Mg may be understood based on the increased bonding strength of both Mg-Y (Gd) and Mg-Mg.
GAO LeiZHOU JianSUN ZhiMeiCHEN RongShiHAN EnHou
关键词:第一原理计算固溶强化
稀土元素对镁合金结构及力学性能的影响被引量:3
2013年
通过第一性原理方法,计算了稀土镁合金的晶格常数、弹性模量、体模量、剪切模量、杨氏模量和各向异性参数等性能,研究了稀土元素对镁合金的结构及力学性能的影响.结果表明:固溶体中固溶原子和溶剂原子之间的最近邻原子间距增大,固溶体的体模量减小;固溶原子的4f电子对固溶体的性能有较大的影响,Eu及Yb处出现的晶格常数和力学性能的反常来源于固溶原子的特殊的4f电子层结构;方向性共价键是固溶体脆性增加的原因.
吕钟周健孙志梅陈荣石
关键词:镁合金固溶强化第一性原理化学键
粗晶Mg-3Gd-1Zn合金高温压缩变形过程中的动态再结晶被引量:3
2012年
研究了粗晶Mg-3Gd-1Zn合金在723~823 K,应变速率0.100~0.001 s-1条件下单轴压缩变形过程中的动态再结晶行为。研究结果表明,其热压缩曲线为典型的动态再结晶型,峰值流变应力和稳态流变应力随温度的升高而减小,随应变速率的增大而增大;在该实验温度范围内其变形激活能约为140 kJ.mol-1;再结晶晶粒尺寸lnd与lnZ参数偏离线性关系,且变形温度对再结晶晶粒尺寸的影响比应变速率更大。利用金相和电子背散射技术(EBSD)对773 K,0.010 s-1条件下压缩不同变形量的Mg-3Gd-1Zn合金进行了组织表征,发现其动态再结晶大都发生在孪晶界及其与原始晶界的交叉处,主要为孪生诱发动态再结晶形核(TDRX)机制。再结晶形核初期形状不规则,晶界倾向于呈直角,随着应变量的增大,由于晶界的局部迁移,再结晶晶粒逐渐转变为稳定的等轴晶。
陈晓霞唐伟能陈荣石
关键词:热压缩
镁合金在航天器电控箱体上应用的要求及质量控制技术
中国科学院金属研究所镁合金材料及成形技术创新课题组开发了综合力学性能优异的G04镁合金材料及与之配套的表面具有导电功能的化学镀层。该镁合金材料的比重小、导热性能好、力学性能高;镀层导电性能优异、材料之间的搭接电阻小,镀层...
陈荣石唐伟能单大勇梁松茂韩恩厚柯伟
关键词:航天器减重镁合金材料电磁屏蔽性能
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Y和Gd在Mg中反常固溶强化行为的电子起源:第一性原理计算研究被引量:2
2010年
Y和Gd在Mg中表现出反常高的固溶强化效率,这一现象与传统的弹性交互作用理论相矛盾.采用第一性原理计算研究了不同合金元素Al,Zn,Y,Gd对Mg固溶体中化学键的影响.结果表明,Y和Gd在Mg中反常固溶强化行为的主要原因是Mg-Y(Gd)和Mg-Mg化学键的增强.
高磊周健孙志梅陈荣石韩恩厚
关键词:镁合金固溶强化第一性原理化学键
First-principles calculations of the β'-Mg_7Gd precipitate in Mg-Gd binary alloys被引量:7
2011年
The metastable β' phase is often the most effective hardening precipitate in Mg-Gd based alloys.In this paper,the structural,elastic and electronic properties of the recently identified β'-Mg7Gd precipitate in Mg-Gd binary alloys were investigated using first-principles calculations based on density functional theory.The lattice mismatches between the coherent β'-Mg7Gd precipitate and α-Mg matrix are discussed and used to rationalize the experimentally observed morphology of the precipitate.The mechanical properties were investigated through analysis of the single-crystal elastic constants and the polycrystalline elastic moduli.It is found that β'-Mg7Gd is brittle in nature.Strong covalent bonding in β'-Mg7Gd,as inferred from its electronic structure,further explains its mechanical properties.Our theoretical results show good agreement with experimental measurements.
GAO LeiZHOU JianSUN ZhiMeiCHEN RongShiHAN EnHou
关键词:第一原理计算二元合金
Mg-Gd二元合金中β′-Mg_7Gd沉淀相的第一性原理计算研究被引量:1
2010年
亚稳β′相是Mg-Gd系合金中最有效的沉淀强化相.采用基于密度泛函理论的第一性原理计算研究了Mg-Gd二元合金中β′-Mg7Gd沉淀相的晶格常数、弹性性质以及电子结构.计算结果表明,β′-Mg7Gd与α-Mg基体的晶格错配能够合理解释实验观察到的β′相的形貌.采用弹性常数分析了该相的力学性能及其成键特性.结果表明,β′-Mg7Gd为硬质脆性相.电子结构表明β′-Mg7Gd相中存在强烈的共价键,同时解释了其力学性能.本文的理论计算结果同实验观察的结果吻合.
高磊周健孙志梅陈荣石韩恩厚
关键词:沉淀相电子结构第一性原理计算
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