检索结果-南通市图书馆

Formation and transformation of metastable LPSO building blocks clusters in Mg-Gd-Y-Zn-Zr alloys by spinodal decomposition and heterogeneous nucleation

引用

Journal of Magnesium and Alloys 2024年第2期12卷 673-686页

作者： Xin Zhao Zhong Yang Jiachen Zhang Minxian Liang Liying Wang School of Materials Science and Chemical Engineering Xi’an Technological UniversityXi’an 710021China Xi’an Tianli Metal Composite Material Co.Ltd. Xi’an 710299China

To study the formation and transformation mechanism of long-period stacked ordered(LPSO)structures,a systematic atomic scale analysis was conducted for the structural evolution of long-period stacked ordered(LPSO)structures in the Mg-Gd-Y-Zn-Zr alloy annealed at 300℃~500℃.Various types of metastable LPSO building block clusters were found to exist in alloy structures at different temperatures,which precipitate during the solidification and homogenization *** stability of Zn/Y clusters is explained by the first principles of density functional *** LPSO structure is distinguished by the arrangement of its different Zn/Y enriched LPSO structural units,which comprises local fcc stacking sequences upon a tightly packed *** presence of solute atoms causes local lattice distortion,thereby enabling the rearrangement of Mg atoms in the different configurations in the local lattice,and local HCP-FCC transitions occur between Mg and Zn atoms occupying the nearest neighbor *** finding indicates that LPSO structures can generate necessary Schockley partial dislocations on specific slip surfaces,providing direct evidence of the transition from 18R to *** of the LPSO,devoid of any defects and non-coherent interfaces,was observed separately from other precipitated *** a result,the precipitation sequence of LPSO in the solidification stage was as follows:Zn/Ycluster+Mg layers→various metastable LPSO building block clusters→18R/24R LPSO;whereas the precipitation sequence of LPSO during homogenization treatment was observed to be as follows:18R LPSO→various metastable LPSO building block clusters→14H *** these,14H LPSO was found to be the most thermodynamically stable structure.

关键词： LPSO spinodal decomposition Homogenization treatment Clusters Phase transformation

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Ordering-induced Elinvar effect over a wide temperature range in a spinodal decomposition titanium alloy

引用

Journal of Materials Science & Technology 2023年第19期150卷 245-255页

作者： D.L.Gong H.L.Wang S.H.Hao P.Liu X.Yang Y.N.Jiang W.J.Wang K.Lin B.Li K.Du Y.D.Wang R.Yang Y.L.Hao Shi-changxu Innovation Center for Advanced Materials Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China School of Materials Science and Engineering University of Science and Technology of ChinaShenyang 110016China School of Mechanical Engineering Dongguan University of TechnologyDongguan 523808China Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China Analysis and Testing Center Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China Beijing Advanced Innovation Center for Materials Genome Engineering Institute of Solid State ChemistryDepartment of Physical ChemistryUniversity of Science and Technology BeijingBeijing 100083China State Key Laboratory for Advanced Metals and Materials University of Science and Technology BeijingBeijing 100083China

Temperature-independent elastic modulus is termed as Elinvar effect,which is available by tuning the continuous spin transition of ferromagnetic alloys via composition optimization and the first-order martensitic transformation of shape memory alloys via plastic ***,these reversible mechanisms are restricted generally in a narrow temperature range of less than 300 *** reports,by tuning a spinodal decomposition in a Ti-Nb-based titanium alloy via aging treatment,both the Elinvar effect in a wide temperature range of about 500 K and a high strength-to-modulus ratio of about 1.5%can be obtained by a continuous and reversible crystal ordering *** results demonstrate that the alloy aged at 723 K for 4 h has a nanoscale plate-like modulatedβ+α"two-phase microstructure and its elastic modulus keeps almost constant from 100 to 600 *** and in-situ X-ray diffraction measurements reveal that the crystal ordering parameter of theα"phase increases linearly with temper-ature from 0.88 at 133 K to 0.97 at 523 K but its volume fraction keeps a constant of about 33.8%.This suggests that the continuous ordering of theα"phase toward the high modulusαphase induces a posi-tive modulus-temperature relation to balance the negative relation of the elastically stableβ*** aged alloy exhibits a high yield strength of 1200 MPa,good ductility of 16%and a high elastic admissible strain of 1.5%.Our results provide a novel strategy to extend the Elinvar temperature range and enhance the strength by tuning the crystal ordering of decomposition alloys.

关键词： Titanium alloy spinodal decomposition Crystal ordering Elinvar effect Mechanical properties

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Achieving high strength and ductility in high-entropy alloys via spinodal decomposition-induced compositional heterogeneity

引用

Journal of Materials Science & Technology 2023年第10期141卷 149-154页

作者： Yujie Chen Yan Fang Ruixin Wang Yu Tang Shuxin Bai Qian Yu Department of Materials Science and Engineering Center of Electron Microscopy and State Key Laboratory of Silicon MaterialsZhejiang UniversityHangzhou 310027China College of Aerospace Science and Engineering National University of Defense TechnologyChangsha 410073China

The compositional heterogeneity in high-entropy alloys(HEAs)has been reported to be an inherent en-tity,which significantly alters the mechanical properties of materials by tuning the variation of lattice resistance for dislocation ***,since the body-centered cubic(BCC)structure is not close-packed,the change of lattice resistance is less sensitive to the normal concentration wave compared to that in face-centered cubic(FCC)structured *** this work,we selected a refractory bcc HEAs TiZrNbTa for the matrix and added a small amount of Al to facilitate the special spinodal decomposition *** particular,(TiZrNbTa)98.5 Al 1.5 displayed a typical basket-weave fabric morphology of spinodal decomposition structure with a characteristic periodicity of∼8 nm and had an optimal combination of strength and ductility(the yield strength of 1123±9 MPa and ductility of∼20.7%±0.6%).It was de-termined that by doing in situ TEM mechanical testing,the plastic deformation was dominated by the formation and operation of dislocation loops which provided both edge and screw components of *** synergetic effect of the remarkable chemical heterogeneity created by the spinodal decompo-sition and the spreading lattice distortion in high entropy alloys is quite effective in tuning the mobility of different types of dislocations and facilitates dislocation interactions,enabling the combination of high strength and ductility.

关键词： Bcc high-entropy alloys spinodal decomposition Compositional heterogeneity Dislocation loops High strength Ductility

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Phase-field modelling of spinodal decomposition with G-phase precipitation during ageing

引用

Science China(Technological Sciences) 2021年第12期64卷 2568-2576页

作者： SHI JiaQing SHEN Yao The State Key Lab of Metal Matrix Composites Shanghai Jiao Tong UniversityShanghai 200240China School of Materials Science and Engineering Shanghai Jiao Tong UniversityShanghai 200240China

The duplex stainless steels(DSSs)are susceptible to thermal ageing embrittlement due to the spinodal decomposition and Gphase precipitation in the ferritic *** study presents a ternary(Fe-Cr-Ni)phase-field model for the simulation of spinodal decomposition with concurrent G-phase *** Cahn-Hilliard equations and one Ginzburg-Landau equation are used in the model to describe the diffusion of Cr,Ni,and the growth of G-phase,*** model is able to generate a spinodally-interconnected structure with G-phase particles near theα-α′interfaces,similar to experimental *** kinetic synergy between spinodal decomposition and G-phase precipitation is *** simulation results indicate that Gphase can enhance the evolution of spinodal decomposition by occupying the volume where the decomposition could otherwise occur,and that the system’s elastic strain energy is largely contributed by G-phase rather than spinodal *** results would help in better understanding the states of the materials for plant structural integrity assessment and life management.

关键词： ferrite DSSs spinodal decomposition G-phase phase-field model

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Effect of Cu on the spinodal decomposition of AlZn Alloy with Symmetrical Composition

引用

Journal of Materials Science & Technology 2005年第6期21卷 836-840页

作者： Shiming HAO+, Yuping REN, Hongxiao LI, Dapeng WANG and Gang ZHAOCollege of Materials and Metallurgy, Northeastern University, Shenyang 110004, China College of Materials and Metallurgy Northeastern University Shenyang 110004 China

The effect of Cu addition on the spinodal decomposition of the Al-Zn alloy with symmetrical compositions has been investigated by X-ray diffraction analysis. It is found that the single fcc phase can be obtained in the AlZn alloy with the addition of 2 at. pct Cu after solution treatment at 400℃ and water quenching to room temperature. The modulation structure occurs in two types of alloys aged at room temperature for 30 min. The spinodal process remarkably slows down above or at the three phase equilibrium temperature, particularly at room temperature due to the addition of 2 at. pct Cu. The spinodal time increases by 20 times when aging at 300℃ and by more than 30 times when aging at room temperature.

关键词： Al-Zn(-Cu) alloy spinodal decomposition Lattice parameter X-ray diffraction

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

THERMODYNAMIC CRITERION OF spinodal decomposition IN TERNARY SYSTEMS

引用

Acta Metallurgica Sinica(English Letters) 1991年第8期4卷 75-81页

作者： JIANG Bohong ZHANG Meihua WEI Qing XU Zuyao(T.Y.Hsu) Shanghai Jiaotong University,Shanghai,China Shanghai Jiaotong Univ Shanghai China

By expanding the Gibbs free energy of a ternary system into a Taylor series with respect to the composition,a thermodynamic criterion of spinodal decomposition is conducted as G_(xx)(δx)2+2G_(xx)δxδy+G_(yy)(δy)~2spinodal decomposition are *** G_(xx)decomposition unrestricted by the direction of composition fluctuation;when G_(xx)0,or G_(xx)>0, G_(xy)~2-G_(xx)G_(yy)>0,as well as G_(xx)=0,are all considered as unstable decomposition restricted by the direction of composition fluctuation δx and δ*** phenomenon of turning round in composition during spinodal decomposition is attempted to be explained from above point of *** computer calculated ranges of unstable decomposition according to the criterion of spinodal decomposition on Cu-Ni-Fe ternary system is consistent with the experimental re- sults obtained from literatures.

关键词： spinodal decomposition thermodyamic criterion Cu-Ni-Fe

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Phase-field study of spinodal decomposition under effect of grain boundary

引用

Chinese Physics B 2021年第8期30卷 524-528页

作者：邓英远郭灿王锦程刘倩赵玉平杨卿 School of Materials Science and Engineering Xi'an University of TechnologyXi'an 710048China State Key Laboratory of Solidification Processing Northwestern Polytechnical UniversityXi'an 710072China

Grain boundary directed spinodal decomposition has a substantial effect on the microstructure evolution and properties of polycrystalline *** morphological selection mechanism of spinodal decomposition at grain boundaries is a major challenge to reveal,and remains elusive so *** this work,the effect of grain boundaries on spinodal decomposition is investigated by using the phase-field *** simulation results indicate that the spinodal morphology at the grain boundary is anisotropic bicontinuous microstructures different from the isotropic continuous microstructures of spinodal decomposition in the bulk ***,at grain boundaries with higher energy,the decomposed phases are alternatingα/βlayers that are parallel to the grain *** the contrary,alternatingα/βlayers are perpendicular to the grain boundary.

关键词： spinodal decomposition grain boundary phase-field method pattern formation

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Transient spinodal decomposition during annealing of rapidly solidified Al-10Sr alloy

引用

Journal of University of Science and Technology Beijing 2003年第1期10卷 58-60页

作者： Yan Wang Guodong Liu 等 SchoolofMaterialsScienceandEngineering JinanUniversityJian250022China ShandongShandaHeatTreatmentFactory ShandongUniversityJian250061China

Rapidly solidified Al-10Sr alloy ribbons were prepared using a single roller melt spinning technique. The annealing process of the rapidly solidified Al-10Sr alloy has been carried out using differential scanning calorimetry (DSC). The microstructure of as-annealed Al-10Sr alloy has been characterized by transmission electron microscopy (TEM). The equilibrium AUSr phase is dominant in the as-annealed alloy. Besides the Al4Sr phase, an AlSr phase is also found in the alloy isothermally annealed at 873 K for 90 min. Furthermore, a modulated nanostructure was observed in the alloy isothermally annealed at 873 K for 90 min. With further prolonged annealing time, however, the AlSr phase disappears in the as-annealed alloy. The dependence of particle size and growth rate on annealing time as well as the modulated structure shows that the occurrence of the AlSr phase may be due to the spinodal decomposition.

关键词： Al-Sr alloys rapid solidification spinodal decomposition annealing

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Microscopic Phase Field Study of the spinodal decomposition in Fe-Mo Alloys

引用

Journal of Wuhan University of Technology(Materials Science) 2009年第S1期24卷 9-12页

作者：朱景川赵荣达 School of Materials Science and Engineering Harbin Institute of Technology

The spinodal decomposition in Fe-Mo alloys is studied by microscopic phase field method based on atomic *** results show that critical temperature of spinodal decomposition increases with the increment of Mo content,up to a maximum value of 1340 K at the Mo content of 50%.The spinodal decomposition shows a maximum rate at the Mo content of 50% for different Fe-Mo *** with the interconnected microstructure without considering elastic strain energy,the microstructure arrayed alternatively along the elastic soft direction of [01] and [10] is obtained under the effects of elastic strain energy,which will changes into a special 'macrolattice' structure during subsequent coarsening *** coarsening of microstructure is restrained by elastic interaction generated by atomic-size difference,and a larger atomic-size difference induces a stronger restraining effect.

关键词： spinodal decomposition phase field Fe-Mo alloys atomic-size difference

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

EFFECT OF Y ON THE spinodal decomposition RATE AND MECHANICAL PROPERTIES OF Cu-9Ni-6Sn ALLOY

引用

Transactions of Nonferrous Metals Society of China 1992年第4期2卷 78-81页

作者： Deng Zhongmin Kunming Institute of Precious Metals Kunming 650221China

By measurement of mechanical and electrical properties,modulation wavelength,TEM techniques,etc.,the effect of Y on the spinodal decomposition in a Cu-9Ni-6Sn alloy has been *** results show that Y can accelerate spinodal decomposition in the alloy,hinder the growth of celluoid structurers occurring at grain boundaries,and improve the combination of strength and plasticity.

关键词： Cu-9Ni-6Sn spinodal decomposition Y

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：