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国家自然科学基金(50731002)

作品数:13 被引量:47H指数:4
相关作者:秦高梧任玉平刘立斌郭运裴文利更多>>
相关机构:东北大学中南大学北京科技大学更多>>
发文基金:国家自然科学基金辽宁省教育厅高校重点实验室项目国家教育部博士点基金更多>>
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13 条 记 录,以下是 1-10
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Thermodynamic modeling of the Ge-La binary system
The Ge-La binary system was critically assessed by means of the CALculation of PHAse Diagram(CALPHAD) techniqu...
刘妙李长荣杜振民郭翠萍牛春菊
Isothermal Section of the Mg-rich Corner in the Mg-Sn-Gd Ternary System at 300℃
Mg-Sn based alloys have been increasingly attended as the potential creep resistant system due to the existenc...
郭运任玉平陈冬赵宏达黄维裴文利李松秦高梧
Influence of DC and AC Magnetic Fields on the Solidification Structures of Al-Fe-Si Alloys
2011年
The effects of the DC and AC magnetic fields on the phase composition, morphology and distribution of the ternary Al-Fe-Si alloy were investigated. The solidification structures of the alloy solidified with and without the application of magnetic fields were confirmed by DSC and structural measurements. The results showed that, Fe/Si ratio plays an important role in determining the reaction type, which in turn affects the phase composition, morphology. As for the alloy with the Fe/Si ratio 1.2, the elongated needle-like Al3Fe phase was the dominant phase in the dendritic regions with the minor amount of Chinese script-like α-AlFeSi. As for the alloy with the Fe/Si ratio 0.2, the Chinese script-like α-AlFeSi was the dominant phase, accompanied with a small amount of needle-like β-AlFeSi and granular Si. In these Al-Fe-Si alloys, the homogeneous distribution of the intermetallics formed in the interdendritic regions was achieved with the application of the DC magnetic field. However, the intermetallic phases were accumulated towards the sample center with the application of the AC magnetic field. This was attributed to the accumulation of the iron-containing cluster and silicon-containing cluster at the melt center. Furthermore, the amount of Chinese script-like α-AlFeSi was increased remarkably in the former alloy under AC magnetic field, while in the latter alloy, the amount of β-AlFeSi and Si was increased under AC magnetic field.
Ban Chunyan, Liu Na, Wang Na, Han Yi, Ba Qixian, Cui Jianzhong Key Laboratory of National Education Ministry for Electromagnetic Processing of Materials, Northeastern University, Shenyang 110004, China
关键词:DCMAGNETICFIELDMAGNETICFIELDMORPHOLOGY
Ternary compounds and solid-state phase equilibria in Mg-rich side of Mg-Zn-Ca system at 300 ℃
2011年
The phase equilibria and compositions in Mg-rich side at 300 ℃ were investigated in Mg-Zn-Ca ternary system through the equilibrated alloy method by using scanning electron microscopy,electron probe microanalysis,X-ray diffraction and transmission electron microscopy.The results show that two ternary compounds T1 and T2 can be in equilibrium with the Mg-based solid solution in Mg-Zn-Ca system.T1 phase is a linear compound with the composition region(molar fraction) of 15% Ca,20.5%-48.9% Zn and balanced Mg at 300 ℃.Its hexagonal structure parameters decrease with increasing Zn content,i.e.a=0.992-0.945 nm,c=1.034-1.003 nm.T2 phase has hexagonal structure with the composition region of 26.4%-28.4% Mg,63.2%-65.5% Zn and 7.1%-8.4% Ca.At 300 ℃,the solubility of Zn in the Mg-based solid solution increases for the addition of Ca,the maximum solubility of Zn is 3.7%.Three-phase fields consisting of--Mg+Mg2Ca+T1,--Mg+T1+T2,--Mg+T2+MgZn and MgZn+T2+Mg2Zn3 exist in the Mg-Zn-Ca system at 300 ℃.
李洪晓任玉平马倩倩蒋敏秦高梧
关键词:STRUCTURECOMPOSITION
Mechanical Property Behavior of Indirect-Extruded Mg-7Sn Binary Alloy under Compression and Tension
Microstructure and mechanical properties of Mg-7Sn alloy extruded indirectly at 300℃have been investigated.The...
陈冬赵宏达任玉平裴文利李松秦高梧
关键词:EXTRUSION
Mg-Sn-Si三元系300℃富Mg角等温截面的研究
镁合金作为目前最轻的金属结构材料,在航空航天、汽车、电子和家电等行业具有极其重要的应用介值和广阔的应用前景,Mg-Sn-Si三元系作为一种新型耐热Mg合金,逐渐引起了人们的注意。但该体系相图的研究还很不充分。因此,本实验...
赵宏达任玉平陈冬郭运李松裴文利秦高梧
关键词:等温截面
Isothermal section of Mg-Nd-Gd ternary system at 723 K被引量:3
2014年
An isothermal section of the Mg-Nd-Gd ternary system at 723 K was established by diffusion triple technique and electron probe microanalysis (EPMA). Mg3Gd and Mg3Nd form a continuous solid solution (Gd,Nd)3Mg, and a continuous solid solution (Gd,Nd)Mg is also formed between MgGd and MgNd. Mg7Gd, Mg5Gd, Mg2Gd, Mg41Nd5, (Gd,Nd)3Mg and (Gd,Nd)Mg are found in the ternary system. In these intermetallic phases, Mg7Gd has been reported to be a metastable phase in previous literatures. The solubilities of Mg, Gd and Nd in all the phases were detected. Furthermore, four three-phase equilibria, α(Mg)+Mg7Gd+Mg41Nd5, Mg7Gd+Mg5Gd+Mg41Nd5, Mg5Gd+Mg41Nd5+(Gd,Nd)3Mg and (Gd,Nd)3Mg+(Gd,Nd)Mg+Mg2Gd, were identified in the isothermal section.
肖龙钟燕陈翠萍吴刘明明罗天旷刘立斌林葵
Thermodynamic optimization of Bi-Ni binary system被引量:1
2011年
Based on the available experimental data,the Bi-Ni binary system was optimized thermodynamically by the CALPHAD method.The solution phases,including liquid,fcc_A1(Ni) and rhombohedral_A7(Bi),were described as substitutional solution phases,of which the excess Gibbs energies were expressed with the Redlich-Kister polynomial.The intermetallic compound,BiNi,was modeled using three sublattices(Bi)(Ni,Va)(Ni,Va) considering its crystal structure(NiAs-type) and the compatibility of thermodynamic database in the multi-component systems,while Bi3Ni was treated as a stoichiometric compound.Finally,a set of self-consistent thermodynamic parameters formulating the Gibbs energies of various phases in this binary system were obtained.The calculated results are in reasonable agreement with the reported experimental data.
王江孟凡桂刘立斌金展鹏
关键词:THERMODYNAMICSCALPHAD
Phase equilibria in Mg-rich corner of Mg-Ca-RE(RE=Gd,Nd) systems at 400℃被引量:3
2013年
The phase equilibria in Mg-rich corner of Mg-Ca-Gd and Mg-Ca-Nd ternary systems at 400℃ were determined through the equilibrated alloy method by using XRD, SEM, EPMA and DSC. Partial isothermal sections in Mg-rich corner of Mg-Ca-Gd and Mg-Ca-Nd ternary systems at 400 ℃ were constructed from 13 alloys. A three-phase region of a-Mg, Mg41RE5 and Mg2Ca was determined in both ternary systems. It is formed by a similar ternary eutectic reaction L→a-Mg+Mg2Ca+Mg41RE5 at 499.6 ℃ and 505.6 ℃, respectively. It is found that the maximum solubility of Ca in Mg5Gd is 3.68% (molar fraction) and 3% of Gd can be dissolved in Mg2Ca in the Mg-Ca-Gd system at 400 ℃. While in the Mg-Ca-Nd system, the maximum solubility of Ca in Mg41Nd5 is 3.57% and 1.24% of Nd can be dissolved in Mg2Ca at 400 ℃. Other three-phase equilibria existing in Mg-rich corner of Mg-Ca-Gd system are a-Mg+MgsGd+T and MgsGd+Mg2Ca+T and the three-phase equilibrium in Mg-rich corner of Mg-Ca-Nd system is Mg3Nd+Mg2Ca+ Mg41Nd5.
费厚军徐广龙刘立斌薄宏曾丽君陈翠萍
关键词:SOLUBILITY
Mg-Zn-RE系镁合金相关系及其微观组织演化研究相关系及其微观组织演化研究
镁合金具有比重轻、比强度和比刚度高、以及良好的电磁屏蔽能力、阻尼减震性好、易切削加工性和可再生利用性等优异性能,在汽车、航空航天及电子产品等领域具有重要的应用价值和广阔的应用前景。然而,镁合金室温强度不高、高温强度低、抗...
戚海英刘立斌金展鹏
关键词:相图
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