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高温变形对Al_(0.1)(MoNbTa_(0.7)ZrTi)难熔高熵合金微观组织的影响

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特种铸造及有色合金 2024年第3期44卷 294-298页

作者：董福宇关金源张悦申向阳郭子鹤黄宏军袁晓光沈阳工业大学材料科学与工程学院沈阳110870

为了解决铸态难熔高熵合金中枝晶粗大及元素偏析问题,通过非自耗真空电弧熔炼炉制备出Al_(0.1)(MoNbTa_(0.7)ZrTi)难熔高熵合金,在Gleeble-3500试验热模拟机上进行了不同温度的单轴高温压缩试验,探索了变形温度对Al_(0.1)(MoNbTa_(0.7)Z... 详细信息

为了解决铸态难熔高熵合金中枝晶粗大及元素偏析问题,通过非自耗真空电弧熔炼炉制备出Al_(0.1)(MoNbTa_(0.7)ZrTi)难熔高熵合金,在Gleeble-3500试验热模拟机上进行了不同温度的单轴高温压缩试验,探索了变形温度对Al_(0.1)(MoNbTa_(0.7)ZrTi)难熔高熵合金微观组织的影响。结果表明,高温变形后,Al_(0.1)(MoNbTa_(0.7)ZrTi)难熔高熵合金仍为体心立方双相固溶体结构,并未改变其相组成。元素偏析现象随着变形温度的升高而逐渐减弱,同时合金组织变均匀,枝晶晶粒尺寸变小。

关键词：难熔高熵合金高温变形体心立方结构枝晶偏析

Manipulating internal flow units toward favorable plasticity in Zr-based bulk-metallic glasses by hydrogenation

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Journal of Materials Science & Technology 2022年第7期102卷 36-45页

作者： fuyu dong Yuexin Chu Mengyuan He Yue Zhang Weidong Li Peter K.Liaw Binbin Wang Liangshun Luo Yanqing Su Robert O.Ritchie Xiaoguang Yuan School of Materials Science and Engineering Shenyang University of TechnologyShenyangChina School of Materials Science and Engineering Northeastern UniversityShenyangChina Department of Materials Science and Engineering The University of TennesseeKnoxvilleTNUSA School of Materials Science and Engineering Harbin Institute of TechnologyHarbinChina Department of Materials Science and Engineering University of CaliforniaBerkeleyCA94720USA

This work intends to manipulate the internal flow units in Zr_(55)Cu_(30)Ni_(5)Al_(10)bulk-metallic glasses(BMGs)through plasma-assisted hydrogenation to generate a positive microalloying effect on *** on the cooperative shear model theory,serration-flow statistics during nanoindentation loading and creep tests during the holding stage were used to analyze the influence of hydrogen on the behavior of flow units in *** observations showed that the hydrogen in the Zr_(55)Cu_(30)Ni_(5)Al_(10)BMGs caused mechanical softening,plasticity improvement,and structural *** also showed that the average volume,size,and activation energy of internal flow units in the BMGs all increased as a result of the increase in the hydrogen *** hydrogenation in the BMGs was found to lead to a prolifera-tion of shear bands,which promoted *** aggregation of these internal flow units reduced the stress required for plastic deformation through shear bands,ultimately causing softening and structural relaxation.

关键词： Bulk-metallic glass Plasma-assisted hydrogenation Nanoindentation Internal flow unit Serrations Nano-scale creep

Hot Deformation Behaviors in Ti-6Al-4V/(TiB+TiC)Composites

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Acta Metallurgica Sinica(English Letters) 2021年第12期34卷 1747-1757页

作者： Xuejian Lin Hongjun Huang fuyu dong Yue Zhang Xiaoguang Yuan Bowen Zheng Xiaojiao Zuo School of Materials Science and Engineering Shenyang University of TechnologyShenyang 110870China

Thermal compression testing was investigated using the Gleeble 3800 thermal simulator,and thermal deformation behavior of particle-reinforced titanium matrix composites(TMCs)was studied under deformation temperatures of 750-900°C,strain rates of 0.001-1 s^(-1),and experimental deformation of 60%.According to obtained flow stress curves,the hot deformation characteristics were *** on the Arrhenius hyperbolic sinusoidal model,the constitutive equation at high temperature was *** on the theory of dynamic material models,a hot processing map of TMCs at high temperature was established,and the peak region of power dissipation rate and the instability region in the hot processing map were both *** the same time,the corresponding microstructures in the peak power dissipation rate and rheological instability regions were *** results showed that flow stress decreased with increasing deformation temperature and increased with increasing strain *** thermal deformation activation energy of titanium matrix composites was 301.8 kJ/*** Ti-6Al-4V/(TiB+TiC)composites possessed only one instability zone under high-temperature compression at a strain of 0.5,with corresponding temperatures at 750-840°C and strain rates at 0.1-1 s^(-1).The optimal thermal deformation parameters included corresponding temperatures of 830-880°C and strain rates of 0.001-0.05 s^(-1).The microstructures corresponding to optimal hot working parameters in processing maps were more homogeneous than the microstructures in the instability zone,including the distribution uniformity of reinforcement and the degree of dynamic recrystallization,and no instability phenomena including abnormal grain growth,microcracks or intensive fracture of reinforcements were found,indicating that the hot processing map had a positive guiding effect on the option of desirable material thermal-working parameters.

关键词： Ti-6Al-4V/(TiC+TiB)composites Hot deformation Flow stress behavior Processing map

The clustering of galaxies in the DESI imaging legacy surveys DR8:I. The luminosity and color dependent intrinsic clustering

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Science China(Physics,Mechanics & Astronomy) 2021年第8期64卷 120-137页

作者： ZhaoYu Wang HaoJie Xu XiaoHu Yang YiPeng Jing Kai Wang Hong Guo fuyu dong Min He Department of Astronomy School of Physics and Astronomyand Shanghai Key Laboratory for Particle Physics and CosmologyShanghai Jiao Tong UniversityShanghai 200240China Tsung-Dao Lee Institute and Key Laboratory for Particle Physics Astrophysics and CosmologyMinistry of EducationShanghai Jiao Tong UniversityShanghai 200240China Department of Astronomy Tsinghua UniversityBeijing 100084China Department of Astronomy University of Massachusetts AmherstAmherst 01003USA Key Laboratory for Research in Galaxies and Cosmology Shanghai Astronomical ObservatoryShanghai 200030China School of Physics Korea Institute for Advanced StudySeoul 02455Korea

In a recent study,we developed a method that models the impact of photometric redshift uncertainty on the two-point correlation function (2PCF).Using this method,we simultaneously obtained both the intrinsic clustering strength and the photometric redshift errors by fitting the projected 2PCF with two integration depths along the ***,we apply this method to the Dark Energy Spectroscopic Instrument (DESI) Legacy Imaging Surveys Data Release 8 (LS DR8),which is the largest galaxy sample currently *** separate the galaxies into 20 samples in eight redshift bins,from z=0.1 to z=1.0,and several z-band absolute magnitude bins,with M_(z)≤-*** galaxies are further divided into red and blue subsamples according to their M_(r)^(0.5)-M_(z)^(0.5) *** measure the projected 2PCFs for all these galaxy subsamples and fit them using our photometric redshift 2PCF *** find that the photometric redshift errors are smaller in the red subsamples than in the overall *** contrast,some systematic photometric redshift errors exist in the blue subsamples,such that some of the subsamples show a significantly enhanced 2PCF on large ***,separately focusing only on the red subsamples and on all the subsamples,we find that the biases of the galaxies in these subsamples exhibit clear color,redshift,and luminosity dependencies;the brighter red galaxies at higher redshift are more biased than their bluer and low-redshift *** from the best-fit set of parameters,σz and b,from this state-of-the-art photometric redshift survey,we obtain high-precision intrinsic clustering measurements for these 40 red-and all-galaxy *** measurements,on large and small scales,hold important information regarding cosmology and galaxy formation that will be used in our subsequent probes in this series.

关键词： dark matter large-scale structure cosmology

Impact of hydrogen microalloying on the mechanical behavior of Zr-bearing metallic glasses: A molecular dynamics study

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Journal of Materials Science & Technology 2020年第10期42卷 198-206页

作者： Binbin Wang Liangshun Luo fuyu dong Liang Wang Hongying Wang Fuxin Wang Lei Luo Baoxian Su Yanqing Su Jingjie Guo Hengzhi Fu National Key Laboratory for Precision Hot Processing of Metals School of Materials Science and EngineeringHarbin Institute of TechnologyHarbin150001China School of Materials Science and Engineering Shenyang University of TechnologyShenyang110870China AVIC Manufacturing Technology Institute Beijing100024China

Comparative studies on Zr35Cu65and Zr65Cu35amorphous systems were performed using molecular dynamic simulations to explore whether their hydrogenated mechanical behavior depends on the content of hydride-forming *** both of them present an increased strength and ductility after hydrogen microalloying,we observe the improved mechanical behavior for Zr35Cu65is more pronounced than that for *** these two samples,the distribution of configurational potential energy and flexibility volume respectively follows a similar H-induced variation tendency;all of the hydrogenated alloys not just have more stable atoms with smaller flexibility volume,but possess a larger fraction of readily activated ***,the atomic-scale details,based on the local"gradient atomic packing structure"model,indicate minor additions of hydrogen can promote more"soft spots"along with more strengthened"backbones"in the low-Zr alloy than that in the high-Zr sample,which endows the former with much higher strength and deformability after hydrogen *** regard this finding as a further step forward to distilling the tell-tale metrics of the H-dependent mechanical behavior observed in Zr-based metallic glasses.

关键词： Metallic glasses Molecular dynamics Mechanical behavior Atomic structure Hydrogen

Nanometer-scale gradient atomic packing structure surrounding soft spots in metallic glasses

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npj Computational Materials 2018年第1期4卷 312-322页

作者： Binbin Wang Liangshun Luo Enyu Guo Yanqing Su Mingyue Wang Robert O.Ritchie fuyu dong Liang Wang Jingjie Guo Hengzhi Fu National Key Laboratory for Precision Hot Processing of Metals School of Materials Science and EngineeringHarbin Institute of TechnologyHarbin 150001China School of Materials Science and Engineering Dalian University of TechnologyDalian 116024PR China AVIC Manufacturing Technology Institute Beijing 100024China Department of Materials Science and Engineering University of CaliforniaBerkeleyCA 94720USA Materials Sciences Division Lawrence Berkeley National LaboratoryBerkeleyCA 94720USA School of Materials Science and Engineering Shenyang University of TechnologyShenyang 110870China

The hidden order of atomic packing in amorphous structures and how this may provide the origin of plastic events have long been a goal in the understanding of plastic deformation in metallic *** pursue this issue,we employ here molecular dynamic simulations to create three-dimensional models for a few metallic glasses where,based on the geometrical frustration of the coordination polyhedra,we classify the atoms in the amorphous structure into six distinct species,where“gradient atomic packing structure”*** local structure in the amorphous state can display a gradual transition from loose stacking to dense stacking of atoms,followed by a gradient evolution of atomic *** such,the amorphous alloy specifically comprises three discernible regions:solid-like,transition,and liquid-like regions,each one possessing different types of *** also demonstrate that the liquid-like atoms correlate most strongly with fertile sites for shear transformation,the transition atoms take second place,whereas the solid-like atoms contribute the least because of their lowest correlation level with the liquid-like *** the“geometrically unfavored motifs”model which fails to consider the role of medium-range order,our model gives a definite structure for the so-called“soft spots”,that is,a combination of liquid-like atoms and their neighbors,in favor of quantifying and comparing their number between different metallic glasses,which can provide a rational explanation for the unique mechanical behavior of metallic glasses.

关键词： alloy glasses metallic

TiZrHfNbMo难熔高熵合金等离子体氢化及力学性能

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热加工工艺 2022年第7期51卷 72-74,78页

作者：袁野董福宇张悦黄宏军袁晓光沈阳工业大学材料科学与工程学院辽宁沈阳110870

为了改善难熔高熵合金的热加工性,通过等离子辅助气体合金化的方式,在熔炼气氛中通入H;和Ar的混合气体,使氢溶入TiZrHfNbMo难熔高熵合金中。研究了不同H含量下,TiZrHfNbMo难熔高熵合金组织和力学性能的变化规律。结果表明,H的存在并没... 详细信息

为了改善难熔高熵合金的热加工性,通过等离子辅助气体合金化的方式,在熔炼气氛中通入H;和Ar的混合气体,使氢溶入TiZrHfNbMo难熔高熵合金中。研究了不同H含量下,TiZrHfNbMo难熔高熵合金组织和力学性能的变化规律。结果表明,H的存在并没有改变合金相组成,但室温压缩强度、硬度、伸长率有所下降,伸长率从21%降至19%,H的加入显著细化了枝晶间距,减少二次枝晶臂数量及尺寸。置氢以后的合金高温流动应力从622 MPa降至498 MPa。

关键词：难熔高熵合金微观组织力学性能氢等离子体热变形

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氢对非晶合金影响的研究进展

稀有金属材料与工程 2013年第7期42卷 1536-1540页

作者：董福宇骆良顺苏彦庆郭景杰傅恒志哈尔滨工业大学黑龙江哈尔滨150001

非晶合金具有一系列的优异性能,为当前材料界的研究热点之一。本文综述了氢对非晶合金影响的研究情况,重点介绍了氢对非晶合金形成的影响、氢对非晶合金力学性能与阻尼性能的影响,以及氢对非晶合金晶化行为的影响。最后概述了氢对非晶... 详细信息

非晶合金具有一系列的优异性能,为当前材料界的研究热点之一。本文综述了氢对非晶合金影响的研究情况,重点介绍了氢对非晶合金形成的影响、氢对非晶合金力学性能与阻尼性能的影响,以及氢对非晶合金晶化行为的影响。最后概述了氢对非晶合金影响的研究过程中存在的问题及未来研究方向。

关键词：非晶合金氢氢致非晶化力学性能阻尼性能晶化行为

论习近平《在文艺工作座谈会上的讲话》对新疆高校文学教育的指导意义

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乌鲁木齐职业大学学报 2018年第1期27卷 26-30页

作者：付玉东巴音郭楞职业技术学院新疆库尔勒841000

文学教育是高校对大学生实施人文素质教育的重要方面,对塑造大学生的精神品格具有重要作用。习近平《在文艺工作座谈会上的讲话》对高校文学教育具有重要指导意义。以《讲话》精神为指导,深入开展新疆高校文学教育,有助于开展思想教育工... 详细信息

文学教育是高校对大学生实施人文素质教育的重要方面,对塑造大学生的精神品格具有重要作用。习近平《在文艺工作座谈会上的讲话》对高校文学教育具有重要指导意义。以《讲话》精神为指导,深入开展新疆高校文学教育,有助于开展思想教育工作,有利于弘扬中华文化,凝聚民族精神,促进民族团结,有利于提升学生的综合人文素养,有利于维护社会稳定和长治久安。

关键词：习近平文艺工作文学教育指导意义