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Acta Metallurgica Sinica(English Letters) 2024年第1期37卷 78-88页

作者： Leilei Li Kaikai Song Qingwei Gao Changshan Zhou Xiaoming Liu yaocen wang Xiaojun Bai Chongde Cao School of Physical Science and Technology Northwestern Polytechnical UniversityXi’an710016China Weihai Research Institute of Industrial Technology Shandong UniversityWeihai264209China Research and Development Institute of Northwestern Polytechnical University in ShenzhenShenzhen518057China

The L1_(2)-strengthened Co_(34)Cr_(32)Ni_(27)Al_(4)Ti_(3)medium-entropy alloy(MEA)with precipitations of grain boundaries has been developed through selective laser melting(SLM)followed by cold rolling and annealing,exhibiting excellent strength-ductility synergy.The as-printed alloy exhibits low yield strength(YS)of~384 MPa,ultimate tensile strength(UTS)of~453 MPa,and uniform elongation(UE)of 1.5%due to the existence of the SLM-induced defects.After cold rolling and annealing,the YS,UTS,and UE are significantly increased to~739 MPa,~1230 MPa,and~47%,respectively.This enhancement primarily originates from the refined grain structure induced by cold rolling and annealing.The presence of coherent sphericalγ'precipitates(L1_(2)phases)and Al/Ti-rich precipitates at the grain boundaries,coupled with increased lattice defects such as dislocations,stacking faults,and ultrafine deformation twins,further contribute to the property’s improvement.Our study highlights the potential of SLM in producing high-strength and ductile MEA with coherent L1_(2)nanoprecipitates,which can be further optimized through subsequent rolling and annealing processes.These findings offer valuable insights for the development of high-performance alloys for future engineering applications.

关键词： Medium-entropy alloy Selective laser melting Precipitation Strength Ductility

Structural origin of magnetic softening in a Fe-based amorphous alloy upon annealing

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Journal of Materials Science & Technology 2022年第1期96卷 233-240页

作者： Xing Tong Yan Zhang yaocen wang Xiaoyu Liang Kai Zhang Fan Zhang Yuanfei Cai Haibo Ke Gang wang Jun Shen Akihiro Makino Weihua wang Songshan Lake Materials Laboratory Dongguan 523808China Ningbo Institute of Materials Technology and Engineering Chinese Academy of ScienceNingbo 315201China New Industry Creation Hatchery Center(NICHe) Tohoku UniversitySendai 980-8577Japan Institute for Materials Research Tohoku UniversitySendai 980-8577Japan School of Physical Science and Technology Northwestern Polytechnical UniversityXi’an 710072China Institute of Multidisciplinary Research for Advanced Materials Tohoku UniversitySendai 980-8577Japan Center for High Pressure Science and Technology Advanced Research(HPSTAR) Shanghai 201203China Advanced Institute for Materials Research Tohoku UniversitySendai 980-8577Japan Laboratory for Microstructures Institute of MaterialsShanghai UniversityShanghai 200444China College of Mechatronics and Control Engineering Shenzhen UniversityShenzhen 518060China Institute of Physics Chinese Academy of SciencesBeijing 100190China College of Materials Science and Engineering Tongji UniversityShanghai 201804China

The underlying structural origin of magnetic properties is still elusive in Fe-based amorphous alloys.In this study,distinctive soft magnetic properties were developed in Fe_(76)Si_(9)B_(10)P_(5)amorphous ribbons through systematic design of annealing process.Combining with synchrotron radiation,high-resolution transmission electron microscopy and first principle ab initio molecular dynamic simulation,it is found that the atomic structural evolution both in short range order and medium range order is responsible for the magnetic softness at proper annealing temperature.In short range,formation of separated and densely coordinated Fe-metalloid clusters is instigated to adapt energy minimization,resulting in strengthening of ferromagnetic exchange interaction locally.In medium range,a homogeneous exchangecoupling from the uniformly strong and weak ferromagnetic regions is generated,which significantly weakens magnetic heterogeneity and leads to the excellent magnetic softness.Our findings may provide an effective/promising pathway to modulate the magnetic properties for Fe-based amorphous alloys,and give a comprehensive and quantitative understanding of the structure-properties relationship in amorphous materials.

关键词： Amorphous alloy Soft magnetic properties Synchrotron radiation Atomic structure

Metastable phase separation and rapid solidification of undercooled Co_(40)Fe_(40)Cu_(20) alloy

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Chinese Physics B 2018年第11期27卷 305-309页

作者：白晓军汪姚岑曹崇德 Research and Development Institute of Norlhwestern Polytechnical University in Shenzhen Shenzhen 518057 China Department of Applied Physics Northwestern Polytechnical University Xi'an 710072 China

The metastable liquid phase separation and rapid solidification behaviors of Co_（40） Fe_（40） Cu_（20） alloy were investigated by using differential thermal analysis（DTA） in combination with glass fluxing and electromagnetic levitation（EML） techniques. The critical liquid phase separation undercooling for this alloy was determined by DTA to be 174 K. Macrosegregation morphologies are formed in the bulk samples processed by both DTA and EML. It is revealed that undercooling level, cooling rate, convection, and surface tension difference between the two separated phases play a dominant role in the coalescence and segregation of the separated phases. The growth velocity of the（Fe,Co） dendrite has been measured as a function of undercooling up to 275 K. The temperature rise resulting from recalescence increases linearly with the increase of undercooling because of the enhancement of recalescence. The slope change of the recalescence temperature rise versus undercooling at the critical undercooling also implies the occurrence of liquid demixing.

关键词： undercooling metastable phase separation rapid solidification immiscibility

Formation of L1_(0)-FeNi hard magnetic material from FeNi-based amorphous alloys

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Chinese Physics B 2022年第4期31卷 538-544页

作者：汪姚岑郝梓焱张岩梁晓宇白晓军曹崇德 School of Physical Science and Technology Northwestern Polytechnical UniversityXi’an 710072China Innovation Center of Northwestern Polytechnical University in Chongqing Chongqing 401135China Ningbo Institute of Materials Technology and Engineering Chinese Academy of SciencesNingbo 315201China Institute of Multidisciplinary Research for Advanced Materials Tohoku UniversitySendai 980-8577Japan

L1_(0)-FeNi hard magnetic alloy with coercivity reaching 861 Oe was synthesized through annealing Fe_(42)Ni_(41.3)Si_8 B_(4)P_(4)Cu_(0.7)amorphous alloy,and the L1_(0)-FeNi formation mechanism has been studied.It is found the L1_(0)-FeNi in annealed samples at 400℃mainly originated from the residual amorphous phase during the second stage of crystallization which could take place over 600 C lower than the measured onset temperature of the second stage with a50 C/min heating rate.Annealing at 4000 C after fully crystallization still caused a slight increase of coercivity,which was probably contributed by the limited transformation from other high temperature crystalline phases towards L1_(0)phase,or the removal of B from L1_(0)lattice and improvement of the ordering quality of L1_(0)phase due to the reduced temperature from520℃to 400℃.The first stage of crystallization has hardly direct contribution to L1_(0)-FeNi formation.Ab initio simulations show that the addition of Si or Co in L1_(0)-FeNi has the effect of enhancing the thermal stability of L1_(0)phase without seriously deteriorating its magnetic hardness.The non-monotonic feature of direction dependent coercivity in ribbon segments resulted from the combination of domain wall pinning and demagnetization effects.The approaches of synthesizing L1_(0)-FeNi magnets by adding Si or Co and decreasing the onset crystallization temperature have been discussed in detail.

关键词： L1_(0)-FeNi hard magnetic materials amorphous alloys ab initio simulation

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计量知识的多元化运用

仪器仪表标准化与计量 2023年第5期 24-27页

作者：李垚岑扬州市检验检测中心扬州市225000

一切事物的发展都有其规律,掌握其规律是我们所要探索、了解和运用的目的。规律也可以通过复杂的数学模型来表达,由此可以了解其输入量和输出量之间的对应关系和对应变化。而计量知识的多元化运用是一个可以在生活与工作中帮助人们理解... 详细信息

一切事物的发展都有其规律,掌握其规律是我们所要探索、了解和运用的目的。规律也可以通过复杂的数学模型来表达,由此可以了解其输入量和输出量之间的对应关系和对应变化。而计量知识的多元化运用是一个可以在生活与工作中帮助人们理解并解决问题的辅助技巧。

关键词：数学模型输入量输出量辅助技巧

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大数据背景下民办高校学生管理的新策略

科教文汇 2016年第9期 117-118页

作者：李峣岑王慧思东北师范大学人文学院吉林长春130117

在今天,大数据可以通过大量数据的整合实现对未来科学准确的把握。本论文试图将大数据方法应用到民办高校大学生管理领域,并以不同表现形式将数据管理具体化,实现管理的科学化、高效性。但大数据在技术、理念以及应用方面仍面临诸多问... 详细信息

在今天,大数据可以通过大量数据的整合实现对未来科学准确的把握。本论文试图将大数据方法应用到民办高校大学生管理领域,并以不同表现形式将数据管理具体化,实现管理的科学化、高效性。但大数据在技术、理念以及应用方面仍面临诸多问题与挑战,其解决的有效方法仍需进一步探讨研究。

关键词：大数据高校学生管理教育

中国进口新西兰乳制品贸易波动特征及影响因素分析

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中国乳品工业 2021年第4期49卷 42-44,59页

作者：石耀岑李翠霞姜冰东北农业大学经济管理学院哈尔滨150030 黑龙江省绿色食品科学研究院哈尔滨150028

基于UN comtrade联合国贸易数据库中乳制品相关数据,对1999年-2018年中国向新西兰进口乳制品的贸易波动情况进行分析,并运用恒定市场份额模型,对形成中国进口新西兰乳制品的贸易波动现象的影响因素进行实证研究。结果表明,中国进口新西... 详细信息

基于UN comtrade联合国贸易数据库中乳制品相关数据,对1999年-2018年中国向新西兰进口乳制品的贸易波动情况进行分析,并运用恒定市场份额模型,对形成中国进口新西兰乳制品的贸易波动现象的影响因素进行实证研究。结果表明,中国进口新西兰的乳制品市场规模及产品结构波动明显,受到市场规模、产品结构以及竞争力等多种因素影响,其中中国国内市场规模的扩大和产品结构的调整优化是贸易波动的主要影响因素,竞争力也一定程度的影响中新乳制品贸易情况,根据结果和结论提出相关建议。

关键词：中新贸易乳制品贸易恒定市场份额模型贸易波动特征

模糊模式识别法在低含油饱和度、低电阻率油气层中的应用

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石油物探 1996年第2期35卷 101-106页

作者：陈曜岑中国地质大学武汉430074

常规的测井方法不能有效地反映低含油饱和度、低电阻率的油气层。为此，本文提出用判别函数模糊模式识别法来研究和识别此种类型的油气层，并取得较好的地质效果。

关键词：模糊模式识别法含油饱和度电阻率测井

USE REGRESSION,DISCRIMINATORY AND FUZZY CLUSTER ANALYSES TO DISTINGUISH LITHOLOGY OF SHAANBEI PLATEAU IN QUATERNARY SYSTEM

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USE REGRESSION,DISCRIMINATORY AND FUZZY CLUSTER ANALYSES TO ...

回归分析和判别分析及模糊聚类分析在陕北黄土高原第四纪岩性划分中的应用

Beijing(89) International Symposium on Exploration Geophysics

作者： Chen,yaocen Zhao,Nan China University of Geosciences(Wuhan) Shi,Jiansheng Geohydrologic Brigade No.1,Bureau of GMR of Shaanxi

＜正＞The principal lithology of Shaanbei Loessal Plateau in Quaternary system is loess,paleosoil and sandy loam etc.It is difficult to distinguish lithology accurately with apparent resistivity logging and spontancou...

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物探与化探 1989年第3期13卷 216-224页

作者：陈曜岑赵楠石建胜中国地质大学陕西省地矿局第一水文队

黄土、古土壤、亚砂土等是陕北黄土高原第四纪的主要岩性,由于其导电性及电化学活动性差异不大,故利用视电阻率测井曲线和自然电位测井曲线很难将以上几种岩性准确区分。本文将回归分析、判别分析及模糊聚类分析等数学方法应用到陕北黄... 详细信息

黄土、古土壤、亚砂土等是陕北黄土高原第四纪的主要岩性,由于其导电性及电化学活动性差异不大,故利用视电阻率测井曲线和自然电位测井曲线很难将以上几种岩性准确区分。本文将回归分析、判别分析及模糊聚类分析等数学方法应用到陕北黄土高原第四纪岩性的划分上,特别是模糊聚类分析在区分黄土、古土壤、亚砂土上取得较好的地质效果。

关键词：黄土高原第四纪岩性划分分析法