检索结果-南通市图书馆

Phase field modeling of ferroelastic variant switching in yttria-stabilized t'zirconia with strain gradient elasticity and interface tension

引用

Science China(Technological Sciences) 2024年第5期67卷 1443-1457页

作者： zhou QianQian WEI YueGuang zhou yichun YANG Li College of Engineering BIC-ESATPeking UniversityBeijing100871China School of Advanced Materials and Nanotechnology Xidian UniversityXi’an710126China Frontier Research Center of Thin Films and Coatings for Device Applications Academy of Advanced Interdisciplinary ResearchXidian UniversityXi’an710126China

The 6–8 wt%yttria-stabilized zirconia with a tetragonal structure(t’-YSZ)is extensively employed in thermal barrier *** exceptional fracture toughness of t’-YSZ can be attributed to its distinctive ferroelastic toughening *** and interface tension play a critical role in ferroelastic variant switching at the micro-and *** paper presents an original thermodynamically consistent phase field(PF)theory for analyzing ferroelastic variant switching at the micro-and nano-scale of t’-*** theory incorporates strain gradient elasticity using higher-order elastic energy and interface tension tensor via geometric nonlinearity to represent biaxial tension resulting from interface ***,a mixed-type formulation is employed to implement the higher-order theory through the finite element *** an interface in equilibrium,the effects of strain gradient elasticity result in a more uniform distribution of stresses,whereas the presence of interface tension tensor significantly amplifies the stress magnitude at the *** introduction of an interface tension tensor increases the maximum value of stress at the interface by a factor of 4 to *** nucleation and evolution of variants at a pre-existing crack tip in a mono-phase t’-YSZ have also been *** strain gradient elasticity is capable of capturing the size effect of ferroelastic variant switching associated with microstructures in ***,when the grain size approaches that of the specimen,the critical load required for variant switching at the crack tip increases,resulting in greater dissipation of elastic energy during ferroelastic variant ***,the interface tension accelerates the evolution of *** presented framework exhibits significant potential in modeling ferroelastic variant switching at the micro-and nano-scale.

关键词： thermodynamics strain gradient elasticity interface tension phase field method ferroelastic variant switching

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

Optimization of ferroelectricity and endurance of hafnium zirconium oxide thin films by controlling element inhomogeneity

引用

Journal of Advanced Ceramics 2024年第7期13卷 1023-1031页

作者： Fei Yan Ke Cao Yang Chen Jiajia Liao Min Liao yichun zhou Shaanxi Key Laboratory of High-Orbits-Electron Materials and Protection Technology for Aerospace School of Advanced Materials and NanotechnologyXidian UniversityXi’an 710126China Xi’an Key Laboratory of Reconfigurable Chip and Materials School of Advanced Materials and NanotechnologyXidian UniversityXi’an 710126China Frontier Research Center of Thin Films and Coatings for Device Applications Academy of Advanced Interdisciplinary ResearchXidian UniversityXi’an 710126China

Ferroelectric thin films based on HfO_(2) have garnered increasing attention worldwide,primarily due to their remarkable compatibility with silicon and scalability,in contrast to traditional perovskite-structured ferroelectric ***,significant challenges remain in their widespread commercial utilization,particularly concerning their notable wake-up effect and limited *** address these challenges,we propose a novel strategy involving the inhomogeneous distribution of Hf/Zr elements within thin films and explore its effects on the ferroelectricity and endurance of Hf_(0.5)Zr_(0.5)O_(2) thin *** techniques such as grazing incidence X-ray diffraction,transmission electron microscopy,and piezoresponse force microscopy,we investigated the structural characteristics and domain switching behaviors of these *** experimental results indicate that the inhomogeneous distribution of Hf/Zr contributes to improving the frequency stability and endurance while maintaining a large remnant polarization in Hf_(0.5)Zr_(0.5)O_(2) ferroelectric thin *** adjusting the distribution of Zr/Hf within the Hf_(0.5)Zr_(0.5)O_(2) thin films,significant enhancements in the remnant polarization(2P_(r)>35μC/cm2)and endurance(>109)along with a reduced coercive voltage can be ***,the fabricated ferroelectric thin films also exhibit high dielectric tunability(≥26%)under a low operating voltage of 2.5 V,whether in the wake-up state or *** study offers a promising approach to optimize both the ferroelectricity and endurance of HfO_(2)-based thin films.

关键词： ferroelectric capacitors thin films ferroelectricity hafnium zirconium oxide

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

Improved ferroelectric properties of CMOS back-end-of-line compatible Hf_(0.5)Zr_(0.5)O_(2)thin films by introducing dielectric layers

引用

Journal of Materiomics 2024年第2期10卷 277-284页

作者： Changfan Ju Binjian Zeng Ziqi Luo Zhibin Yang Puqi Hao Luocheng Liao Qijun Yang Qiangxiang Peng Shuaizhi Zheng yichun zhou Min Liao Key Laboratory of Low Dimensional Materials and Application Technology of Ministry of Education School of Materials Science and EngineeringXiangtan UniversityXiangtan411105China School of Advanced Materials and Nanotechnology Xidian UniversityXi'an710126China

Hf_(0.5)Zr_(0.5)O_(2)(HZO)ferroelectric thin films have gained significant attention for the development of next-generation ferroelectric memories by complementary-metal-oxide semiconductor(CMOS)back-end-of-line(BEOL)processing,due to their relatively low crystallization ***,it remains challenging to achieve excellent ferroelectric properties with post deposition annealing(PDA)process at a BEOL compatible *** these lines,in this work,it is demonstrated that the ferroelec-tricity of 15 nm thick HZO thin film prepared by PDA process at 400℃can be improved to varying degrees,via depositing 2 nm thick dielectric layers of Al_(2)O_(3),HfO_(2),or ZrO_(2)at either the bottom or the top of the ***,the HZO thin film with the top-Al_(2)O_(3)layer exhibits remarkable ferroelectric prop-erties,which are independent of the thickness of *** 6 nm thick HZO thin film shows a total remanent polarization(2Pr)of 31 mC/cm^(2)under an operating voltage of 2.5 *** results represent a significant advancement in the fabrication of high-performance,BEOL compatible ferroelectric mem-ories,as compared to previously reported state-of-the-art works.

关键词： Al_(2)O_(3) BEOL processing Ferroelectricity Hf_(0.5)Zr_(0.5)O_(2)(HZO)

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

Hf_(x)Ta_(1-x)C体系力学性能及熔化曲线的第一性原理研究

引用

无机材料学报 2024年第7期39卷 761-768,I0001,I0002页

作者：吴玉豪彭仁赐程春玉杨丽周益春西安电子科技大学先进材料与纳米科技学院陕西省空天高电子轨道材料与防护技术重点实验室西安710126

Hf_(x)Ta_(1-x)C具有高熔化温度、高硬度、高强度,以及导电、导热性好等优异性能,是2000℃以上热防护领域极有潜力的候选材料,但其力学性质与熔化温度随组分变化规律尚不清晰。本研究基于特殊准随机结构(SQS)方法和第一性原理计算,从共... 详细信息

Hf_(x)Ta_(1-x)C具有高熔化温度、高硬度、高强度,以及导电、导热性好等优异性能,是2000℃以上热防护领域极有潜力的候选材料,但其力学性质与熔化温度随组分变化规律尚不清晰。本研究基于特殊准随机结构(SQS)方法和第一性原理计算,从共价键强度、价电子浓度(VEC)的微观角度系统地探讨了Hf_(x)Ta_(1-x)C系固溶体力学性质随组分的变化机理。力学性质计算结果表明:5种组分(HfC、Hf_(0.75)Ta_(0.25)C、Hf_(0.5)Ta_(0.5)C、Hf_(0.25)Ta_(0.75)C与TaC)中,Hf_(0.25)Ta_(0.75)C固溶体具有最高的弹性模量和剪切模量,这主要归因于:(1)该组分具有最高的共价键强度;(2)来自C的p轨道和来自Hf或Ta的d轨道之间的特殊键合在VEC=8.75(Hf_(0.25)Ta_(0.75)C)附近被完全填充,它们强烈抑制形状变化。研究还使用基于从头算分子动力学(AIMD)的分子动力学Z方法计算了Hf_(x)Ta_(1-x)C系固溶体的熔化曲线。结果显示Hf_(x)Ta_(1-x)C系固溶体熔化温度反常增加的现象的确存在,且在Hf_(0.5)Ta_(0.5)C处熔化温度最高(4270 K),这主要归因于构型熵与共价键强度的协同作用。本研究结果为高熔化温度及高力学性能Hf_(x)Ta_(1-x)C系固溶体组分的实验选择及其耐高温涂层应用等提供了理论指导,也为其他过渡金属碳化物研究提供了参考。

关键词： Hf_(x)Ta_(1-x)C 第一性原理力学性质熔化温度

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

发酵茅台白酒糟及可溶物对蛋鸡产蛋性能、蛋品质、粪便微生物的影响

引用

中国饲料 2024年第9期 125-130页

作者：夏军邹益春胡芳刘建忠张飞路德环境科技股份有限公司湖北武汉430070 路德生物环保技术(亳州)有限公司安徽亳州236800

为研究不同水平发酵茅台白酒糟及可溶物(FMDGS)对蛋鸡产蛋性能、蛋品质、粪便微生物的影响,试验选取健康、体况基本一致的30周龄罗曼粉蛋鸡1200只,随机分为对照组和3个试验组,对照组饲喂基础日粮,试验Ⅰ、Ⅱ、Ⅲ组分别在基础日粮中添加1... 详细信息

为研究不同水平发酵茅台白酒糟及可溶物(FMDGS)对蛋鸡产蛋性能、蛋品质、粪便微生物的影响,试验选取健康、体况基本一致的30周龄罗曼粉蛋鸡1200只,随机分为对照组和3个试验组,对照组饲喂基础日粮,试验Ⅰ、Ⅱ、Ⅲ组分别在基础日粮中添加1.5%发酵茅台白酒糟(FMDG),1.5%FMDGS,1%FMDGS,每组5个重复,每个重复60只鸡。预试期10 d,正试期40 d。结果表明:与对照组相比,试验Ⅱ、Ⅲ组在试验21~40 d产蛋率分别显著提高0.78个百分点和1.43个百分点(P<0.05),1~40 d试验组产蛋率有提高趋势(P=0.08);与对照组相比,试验Ⅱ组蛋形指数显著提高(P<0.05);与对照组相比,试验各组蛋鸡粪便中芽孢杆菌数量均显著增加(P<0.05)。添加1.5%FMDG,1.5%FMDGS,1%FMDGS均能不同程度改善蛋鸡产蛋性能,提高蛋品质,促进有益菌的增殖。综合来看,日粮添加1.5%FMDGS,蛋鸡产蛋性能、蛋品质、粪便微生物指标表现最好,效果最佳。

关键词：发酵茅台白酒糟及可溶物蛋鸡产蛋性能蛋品质粪便微生物

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

A chemo-thermo-mechanically constitutive theory of high-temperature interfacial oxidation in alloys under deformation

引用

Science China(Technological Sciences) 2023年第4期66卷 1018-1037页

作者： zhou QianQian YANG Li NIE Min zhou yichun WEI YueGuang College of Engineering BIC-ESATPeking UniversityXi'an 710126China School of Advanced Materials and Nanotechnology Xidian UniversityBeijing 100871China Frontier Research Center of Thin Films and Coatings for Device Applications Academy of Advanced Interdisciplinary ResearchXidian UniversityXi'an 710126China AECC Hunan Aviation Powerplant Research Institute Zhuzhou 412002China

Failure due to interfacial oxidation is one of the most important factors in the failure of alloy systems at high *** analyze high-temperature interfacial oxidation in alloys under deformation,we develop a thermodynamically consistent continuum theory of alloy interfacial oxidation process considering diffusion,oxidation,expansion,viscoplasticity,and deformation *** equations of force,mass,and energy are presented at first,while the coupled constitutive laws and evolution equations are constructed according to energy dissipation *** coupled kinetics reveals a new mechanism whereby deformation affects the oxidation reaction by changing the alloy’s critical oxygen *** tensile loads decrease the critical oxygen concentration and promote oxidation of the ***,external compressive loads increase the critical oxygen concentration and suppress the oxidation of the ***,this theory is applied to thermal barrier coatings(TBCs),exhibiting a good consistency with the high-temperature oxidation experiment of TBCs under external *** model successfully explains that the experimental phenomenon of external tensile load accelerates the growth of Al_(2)O_(3)-TGO(thermally grown oxides).Besides,external compressive loads slow down the growth of Al_(2)O_(3)-TGO at the interface and lead to internal oxidation of the bond *** presented framework has shown great potential for modeling high-temperature interfacial oxidation processes in alloy systems under deformation.

关键词： thermodynamics oxidation oxygen diffusion chemo-thermo-mechanically coupling alloy

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

Prediction of Failure Modes during Deep Drawing of Metal Sheets with Nickel Coating

引用

Journal of Materials Science & Technology 2013年第11期29卷 1059-1066页

作者： Jie Wu Zengsheng Ma yichun zhou Chunsheng Lu Key Laboratory of Low Dimensional Materials and Application Technology of Ministry of Education Xiangtan University Faculty of Materials Optoelectronics and PhysicsXiangtan University Department of Mechanical Engineering Curtin University

To optimize the process parameters, it is necessary to exactly predict failure modes during deep drawing of coated metal sheets, where two main failure forms are fracture and wrinkling. In this paper, finite element simulations based on continuous damage mechanics were used to study the failure behavior during a cylindrical deep drawing of metal sheets with nickel coating. It is shown that taking the effect of blank holder force into account, these two failure modes can be predicted. The simulation results are well consistent with that obtained from experiments.

关键词： Failure Deep drawing Coated metal sheet Damage

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

Determination of phase diagrams using the diffusion couple technique

引用

Rare Metals 2006年第5期25卷 427-430页

作者： XU Honghu DU Yong zhou yichun JIN Zhanpeng State Key Laboratory of Powder Metallurgy Cenaxtl South University Changsha Hunan 410083 China Faculty of Material Photoelectronic Physics Xiangtan University Xiangtan 411105 China

It has been demonstrated that the diffusion couple technique is a powerful and efficient approach in establishing phase relationships of ternary systems. Accurate data on the phase equilibria can be obtained if the appropriate alloys are employed as end members of the diffusion couple. It is desirable to combine the diffusion couple technique with an investigation of the afterwards selected equilibrated alloys so that the precision and reliability of the obtained information about a ternary isotherm could be guaranteed.

关键词： phase equilibria diffusion couple electron probe microanalysis

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

Mesoscopic superelasticity,superplasticity,and superrigidity

引用

Science China(Physics,Mechanics & Astronomy) 2012年第6期55卷 963-979页

作者： MA ZengSheng zhou ZhaoFeng HUANG YongLi zhou yichun SUN ChangQing Key Laboratory of Low-dimensional Materials andApplication Technology Ministry of Educationand Faculty of MaterialsOptoelectronics and PhysicsXiangtan UniversityXiangtan 411105China School of Electric and Electronic Engineering Nanyang Technological UniversitySingapore 639798Singapore

Atomic-undercoordination-induced local bond contraction,bond strength gain,and the associated temperature (T)-dependent atomic-cohesive-energy and binding-energy-density are shown to originate intrinsically the exotic paradox of superplasticity,superelasticity,and superrigidity demonstrated by solid sizing from monatomic chain to mesoscopic *** paradox follows these relationships:(ε(K,T)y(K,T)σ(K,T))∝(exp(B/△T_(mk)),(η_1△T_(mk))d～(-3),[1+AK～(-2/2)exp(△T_(mk)/T)]△T_(mk)d～(-3)),(Plastic strain)(Elastic modulus)(Yield stress,IHPR)where A,B,η1,d and△T_(mk)=Tm(K) Tare size (K)-dependent physical *** (K) is the melting *** work hardening during compressing and self-heating during stretching modulate the measured outcome *** dominates in the solid-quasimolten-liquid transition *** competition between the accumulation and annihilation of dislocations activates the inverse Hall-Petch ***,it is essential for one to discriminate the intrinsic competition between the local bond energy density gain and the atomic cohesive energy loss from the extrinsic factors of pressure and temperature in dealing with atomistic mechano-thermo dynamics.

关键词： BOLS theory LBA approach atomistic mechano-thermo dynamics elastic modulus yield strength temperature coordination bond stress

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

Mathematical Analysis on the Uniqueness of Reverse Algorithm for Measuring Elastic-plastic Properties by Sharp Indentation

引用

Journal of Materials Science & Technology 2011年第7期27卷 577-584页

作者： Yongli Huang Xiaofang Liu yichun zhou Zengsheng Ma Chunsheng Lu Key Laboratory of Low Dimensional Materials and Application Technology of Ministry of Education and Faculty of Materials Optoelectronics and Physics Xiangtan University Xiangtan 411105 China Department of Mechanical Engineering Curtin University Perth WA 6845 Australia

The reverse analysis provides a convenient method to determine four elastic-plastic parameters through an indentation curve such as Young s modulus E, hardness H, yield strength σy and strain hardening exponent n. In this paper, mathematical analysis on a reverse algorithm from Dao model （Dao et al., Acta Mater., 2001, 49, 3899） was carried out, which thought that only when 20 ≤E＊/σ0.033≤ 26 and 0.3n≤ 0.5, the reverse algorithm would yield two solutions of n by dimensionless function Π2. It is shown that, however, there are also two solutions of n when 20≤E＊/σ0.033≤ 26 and 0≤n0.1. A unique n can be obtained by dimensionless function Π3 instead of Π2 in these two ranges. E and H can be uniquely determined by a full indentation curve, and σy can be determined if n is unique. Furthermore, sensitivity analysis on obtaining n from dimensionless function Π3 or Π2 has been made.

关键词： Elastic-plastic properties Sharp indentation Reverse algorithm Uniqueness Sensitivity

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

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：